Pub Date : 2015-08-31DOI: 10.7474/TUS.2015.25.4.359
Soondal Kwon, Seungwan You, Sanghoon Kwon, Ki-Seog Kim
Abstract Rock masses include various rock discontinuities such as faults, joints, and bedding planes. These discontinuities appear as complex structures in geometry. In this study, growth patterns of fractures between two stepping shear fracture tips are numerically modeled using PFC2D (Particle Flow Code). The numerical model showed not only incipient growth of fractures at the tips of preexisting fractures but also subsequent growth of the new fractures. It is observed from all of the experiments that the incipient fractures are tensile cracks developed at 30～57° to the preexisting fractures and the subsequent growth of these fractures were at low angles to the preexisting fractures this study.Key words Shear fracture, Discrete-element code, PFC, Numerical experiment, Fracture growthoints set초 록 암반에는 단층, 절리, 층리 등의 불연속면이 많이 포함되어 있다 . 이러한 불연속면은 기하학적 복합성에 의해 복잡한 구조로 나타난다 . 이 연구는 스텝으로 배열된 두 전단균열의 끝에서 나타나는 구조 발달을 수치 해석적으로 연구하였다 . 이 연구에서는 PFC2D(Particle Flow Code) 프로그램을 이용하여 두 전단균열의 끝에서 형성되는 초기균열(incipient fracture)뿐만 아니라 초기균열에서 덧자라는 균열의 성장과정을 살펴보았으며 , 균열발생 시 나타나는 주변응력상태를 관찰하였다 . 모든 실험 결과에서는 균열 끝에서 발생한 초기 균열 대부분이 인장균열에 의한 것으로 나타났으며 , 균열의 전파각은 초기에 30～57°에서 실험이 더 진행되면 저각으로 발달하는 것으로 나타났다.핵심어 전단균열, 개별요소법, PFC, 수치실험, 균열성장
Abstract Rock masses include various Rock discontinuities such as faults, joints, and bedding planes。These discontinuities appear as complex structures in geometry。In this study, growth patterns of fractures between two stepping shear fracture tips are numerically modeled using PFC2D (Particle Flow Code)。The numerical model showed not only incipient growth of fractures at The tips of preexisting fractures but also subsequent growth of The new fractures。It is observed from all of the experiments that the incipient fractures are tensile cracks developed at 30 ~ 57°to the preexisting fractures and the subsequent growth of these fractures were at lowangles to the preexisting fractures this study。“Key words Shear fracture”、“Discrete-element code”、“PFC”、“Numerical experiment”、“fracture growthoints set”超岩层中含有大量的断层、节理、层理等不连续面。这些不连续面因几何复合性而呈现出复杂的结构。该研究通过数值解析的方式研究了两个剪切裂缝末端的结构发展。在这项研究中，我们使用PFC2D(Particle Flow Code)程序，不仅观察了在两个剪切裂纹末端形成的初始裂纹(incipient fracture)，还观察了在初始裂纹中生长的裂纹生长过程，并观察了裂纹发生时的周围应力状态。所有的实验结果都显示裂纹末端的早期裂纹大部分是由拉伸裂纹引起的，裂纹的传播角在早期30°至57°时发展为低角。关键词剪切龟裂，个别要素法，PFC，数值实验，龟裂成长
{"title":"Pattern of Shear-induced Fracture Development in en Echelon Array : Discrete-element Approach","authors":"Soondal Kwon, Seungwan You, Sanghoon Kwon, Ki-Seog Kim","doi":"10.7474/TUS.2015.25.4.359","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.4.359","url":null,"abstract":"Abstract Rock masses include various rock discontinuities such as faults, joints, and bedding planes. These discontinuities appear as complex structures in geometry. In this study, growth patterns of fractures between two stepping shear fracture tips are numerically modeled using PFC2D (Particle Flow Code). The numerical model showed not only incipient growth of fractures at the tips of preexisting fractures but also subsequent growth of the new fractures. It is observed from all of the experiments that the incipient fractures are tensile cracks developed at 30～57° to the preexisting fractures and the subsequent growth of these fractures were at low angles to the preexisting fractures this study.Key words Shear fracture, Discrete-element code, PFC, Numerical experiment, Fracture growthoints set초 록 암반에는 단층, 절리, 층리 등의 불연속면이 많이 포함되어 있다 . 이러한 불연속면은 기하학적 복합성에 의해 복잡한 구조로 나타난다 . 이 연구는 스텝으로 배열된 두 전단균열의 끝에서 나타나는 구조 발달을 수치 해석적으로 연구하였다 . 이 연구에서는 PFC2D(Particle Flow Code) 프로그램을 이용하여 두 전단균열의 끝에서 형성되는 초기균열(incipient fracture)뿐만 아니라 초기균열에서 덧자라는 균열의 성장과정을 살펴보았으며 , 균열발생 시 나타나는 주변응력상태를 관찰하였다 . 모든 실험 결과에서는 균열 끝에서 발생한 초기 균열 대부분이 인장균열에 의한 것으로 나타났으며 , 균열의 전파각은 초기에 30～57°에서 실험이 더 진행되면 저각으로 발달하는 것으로 나타났다.핵심어 전단균열, 개별요소법, PFC, 수치실험, 균열성장","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125187533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-31DOI: 10.7474/TUS.2015.25.4.332
Seung-Joong Lee, Byung-ryeol Kim, Sung O. Choi, Seokhoon Oh
Ground subsidence occurring in mine area can cause an enormous damage of loss of lives and properties, and a systematic survey should be conducted a series of field investigation and ground stability analysis in subsidence area. This study describes the results from field investigation and ground stability analysis in a limestone mine located in Cheongwon-gun, Chungcheongbuk-do, Korea. Rock mechanical measurements and electrical resistivity surveys are applied to obtain the characteristics of in-situ rock masses and the distribution patterns of subsurface weak zone, and their results are extrapolated in numerical analysis. From the field investigation and stability analysis, it is concluded that the subsidence occurrence in this limestone mine is caused mainly by subsurface limestone cavities.
{"title":"A Case Study of Site Investigation and Ground Stability Analysis for Diagnosis of Subsidence Occurrence in Limestone Mine","authors":"Seung-Joong Lee, Byung-ryeol Kim, Sung O. Choi, Seokhoon Oh","doi":"10.7474/TUS.2015.25.4.332","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.4.332","url":null,"abstract":"Ground subsidence occurring in mine area can cause an enormous damage of loss of lives and properties, and a systematic survey should be conducted a series of field investigation and ground stability analysis in subsidence area. This study describes the results from field investigation and ground stability analysis in a limestone mine located in Cheongwon-gun, Chungcheongbuk-do, Korea. Rock mechanical measurements and electrical resistivity surveys are applied to obtain the characteristics of in-situ rock masses and the distribution patterns of subsurface weak zone, and their results are extrapolated in numerical analysis. From the field investigation and stability analysis, it is concluded that the subsidence occurrence in this limestone mine is caused mainly by subsurface limestone cavities.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124542538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-31DOI: 10.7474/TUS.2015.25.4.320
K. Min, Sehyeok Park, G. Zimmermann
This paper presents a case study of an enhanced geothermal system(EGS) demonstration project conducted in Gros Schonebeck, Northerm Germany, focusing on hydraulic stimulation. The project was conducted with doublet system in sandstone and volcanic formations at 4 - 4.4 km depth. Under normal faulting to strike-slip faulting stress regime, hydraulic stimulations were conducted at injection and production wells by massive waterfrac and gel-proppant fracturing. Injectivity index increased from 0.97 m 3 /(hr*MPa) to 7.5 m 3 /(hr*MPa) and productivity index increased from 2.4 m 3 /(hr*MPa) to 10.1 m 3 /(hr*MPa) by a series of hydraulic stimulations at both wells. After circulation tests through injection and production wells, however, productivity index decreased from 8.9 m 3 /(hr*MPa) to 0.6 m 3 /(hr*MPa) in two years. Slip tendency analysis for the stimulation in volcanic layer estimated the required pressure for shear slip and its preferred orientations and it showed reasonable match with actual stimulation results. Through the microseismicity observation for the stimulation of volcanic formation, only 80 seismic events with its moment magnitudes in -1.8
{"title":"Case Study on Groß Schönebeck EGS Project Research in Germany","authors":"K. Min, Sehyeok Park, G. Zimmermann","doi":"10.7474/TUS.2015.25.4.320","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.4.320","url":null,"abstract":"This paper presents a case study of an enhanced geothermal system(EGS) demonstration project conducted in Gros Schonebeck, Northerm Germany, focusing on hydraulic stimulation. The project was conducted with doublet system in sandstone and volcanic formations at 4 - 4.4 km depth. Under normal faulting to strike-slip faulting stress regime, hydraulic stimulations were conducted at injection and production wells by massive waterfrac and gel-proppant fracturing. Injectivity index increased from 0.97 m 3 /(hr*MPa) to 7.5 m 3 /(hr*MPa) and productivity index increased from 2.4 m 3 /(hr*MPa) to 10.1 m 3 /(hr*MPa) by a series of hydraulic stimulations at both wells. After circulation tests through injection and production wells, however, productivity index decreased from 8.9 m 3 /(hr*MPa) to 0.6 m 3 /(hr*MPa) in two years. Slip tendency analysis for the stimulation in volcanic layer estimated the required pressure for shear slip and its preferred orientations and it showed reasonable match with actual stimulation results. Through the microseismicity observation for the stimulation of volcanic formation, only 80 seismic events with its moment magnitudes in -1.8","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124869255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-31DOI: 10.7474/TUS.2015.25.4.383
Cheehwan Kim
Abstract It is analyzed the risk of building damage due to ground surface subsidence occurred during constructing a tunnel below buildings in sand-gravel layer. The overburden and the thickness of sand-gravel layer is about 20m and the width and the height of the tunnel are 12m and 8.6m, respectively. The tunnel is pre-reinforced by umbrella method with three rows of long steel pipes and grouting. Surface subsidence is measured at 36 points surrounding buildings and measured data are used to calculate optimized three dimensional subsidence surface. Depending on the building location, deflection ratio and horizontal strain are calculated to evaluate the risk of building damage. No damage occurs at the buildings because of both the small deflection ratios involved 1~4mm subsidence and compressive horizontal strains.Key words Sand gravel layer, Multi stage grouting through large diameter steel pipe, Ground surface subsidence, Risk of damage to building초 록 모래자갈층에서 터널굴착 시 발생하는 지표침하에 의해 지상빌딩에 발생하는 손상도를 분석하였다 . 모래자갈층의 두께와 터널까지의 심도는 약 20m이고 터널의 폭과 높이는 각각 12m, 8.6m이다. 터널은 막장전방을 3열의 강관다단그라우팅으로 보강하면서 시공하였다. 터널시공 중에 빌딩주변 36개소에서 지표침하를 계측하였고 이를 이용하여 3차원 지표침하면을 구하고 빌딩의 위치에 따라 처짐비와 수평변형율로 빌딩의 손상도를 평가하였다. 시공 중 계측된 지표침하는 약 1~4mm로 작았고 빌딩은 수평압축변형을 받는 상태가 되어 빌딩에 손상이 발생하지 않았다.핵심어 모래자갈층, 강관다단그라우팅, 지표침하, 빌딩손상도
{"title":"Risk Of Buildings Damage Due To Subsidence During Tunnelling Under The Buildings In Sand-Gravel Layer","authors":"Cheehwan Kim","doi":"10.7474/TUS.2015.25.4.383","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.4.383","url":null,"abstract":"Abstract It is analyzed the risk of building damage due to ground surface subsidence occurred during constructing a tunnel below buildings in sand-gravel layer. The overburden and the thickness of sand-gravel layer is about 20m and the width and the height of the tunnel are 12m and 8.6m, respectively. The tunnel is pre-reinforced by umbrella method with three rows of long steel pipes and grouting. Surface subsidence is measured at 36 points surrounding buildings and measured data are used to calculate optimized three dimensional subsidence surface. Depending on the building location, deflection ratio and horizontal strain are calculated to evaluate the risk of building damage. No damage occurs at the buildings because of both the small deflection ratios involved 1~4mm subsidence and compressive horizontal strains.Key words Sand gravel layer, Multi stage grouting through large diameter steel pipe, Ground surface subsidence, Risk of damage to building초 록 모래자갈층에서 터널굴착 시 발생하는 지표침하에 의해 지상빌딩에 발생하는 손상도를 분석하였다 . 모래자갈층의 두께와 터널까지의 심도는 약 20m이고 터널의 폭과 높이는 각각 12m, 8.6m이다. 터널은 막장전방을 3열의 강관다단그라우팅으로 보강하면서 시공하였다. 터널시공 중에 빌딩주변 36개소에서 지표침하를 계측하였고 이를 이용하여 3차원 지표침하면을 구하고 빌딩의 위치에 따라 처짐비와 수평변형율로 빌딩의 손상도를 평가하였다. 시공 중 계측된 지표침하는 약 1~4mm로 작았고 빌딩은 수평압축변형을 받는 상태가 되어 빌딩에 손상이 발생하지 않았다.핵심어 모래자갈층, 강관다단그라우팅, 지표침하, 빌딩손상도","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"178 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132677494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-30DOI: 10.7474/TUS.2015.25.3.264
K. You, Y. Jung, Jiwon Ha
In this study, the applicability of geotextile mesh soil nails on slopes was evaluated by numerical analysis to reduce environmental problems which a general soil nailing might produce and to improve its economical efficiency and construction convenience. To this end, in situ pull-out tests were conducted for both general soil nail and geotextile mesh soil nail and their pull-out characteristics were analyzed. Also, finite difference method was used to verify the suitability of numerical simulation. Parameters for nail and ground conditions were selected and sensitivity analysis was performed for the evaluation of slope stability. In addition, analysis was performed by limit equilibrium method which is widely used for slope stability analysis in practice. As a result, if the nail diameter was same, there is no big difference between geotextile mesh soil nails and general soil nails in terms of slope stability. Therefore it can be expected that geotextile mesh soil nails could be effective for slope reinforcement since they could keep a slope as stable as general soil nails and give better economical efficiency and construction convenience than general soil nails.
{"title":"Applicability Study of Geotextile Mesh Soil Nail on Slope Reinforcement Using Numerical Analysis","authors":"K. You, Y. Jung, Jiwon Ha","doi":"10.7474/TUS.2015.25.3.264","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.3.264","url":null,"abstract":"In this study, the applicability of geotextile mesh soil nails on slopes was evaluated by numerical analysis to reduce environmental problems which a general soil nailing might produce and to improve its economical efficiency and construction convenience. To this end, in situ pull-out tests were conducted for both general soil nail and geotextile mesh soil nail and their pull-out characteristics were analyzed. Also, finite difference method was used to verify the suitability of numerical simulation. Parameters for nail and ground conditions were selected and sensitivity analysis was performed for the evaluation of slope stability. In addition, analysis was performed by limit equilibrium method which is widely used for slope stability analysis in practice. As a result, if the nail diameter was same, there is no big difference between geotextile mesh soil nails and general soil nails in terms of slope stability. Therefore it can be expected that geotextile mesh soil nails could be effective for slope reinforcement since they could keep a slope as stable as general soil nails and give better economical efficiency and construction convenience than general soil nails.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123894746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-30DOI: 10.7474/TUS.2015.25.3.255
C. Ryu, Byung-Hee Choi, Hyung-Su Jang, Myoung-Soo Kang
Explosive blasting is a very useful tool for mining and civil engineering applications. It, however, may cause severe environmental hazards on adjacent structures due to blasting impact. Blast engineers try to make optimum blast design to provide efficient performance and to minimize the environmental impact as well. It requires a pre-assessment of the impacts resulting from the blasting operation in design stage. One of the common procedures is to evaluate the proposed blast pattern through a series of test blasting in the field. Another approach is to evaluate the possible environmental effects using the numerical methods. There are a number of input parameters to be prepared for the numerical analysis. Some of them are well understood, while some are not. This paper presents some results of sensitivity analysis of the basic input parameters in numerical modelling of blasting problems so as to provide sound understanding of the parameters and some guidelines for input preparation.
{"title":"Effects of Input Parameters in Numerical Modelling of Dynamic Ground Motion under Blasting Impact","authors":"C. Ryu, Byung-Hee Choi, Hyung-Su Jang, Myoung-Soo Kang","doi":"10.7474/TUS.2015.25.3.255","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.3.255","url":null,"abstract":"Explosive blasting is a very useful tool for mining and civil engineering applications. It, however, may cause severe environmental hazards on adjacent structures due to blasting impact. Blast engineers try to make optimum blast design to provide efficient performance and to minimize the environmental impact as well. It requires a pre-assessment of the impacts resulting from the blasting operation in design stage. One of the common procedures is to evaluate the proposed blast pattern through a series of test blasting in the field. Another approach is to evaluate the possible environmental effects using the numerical methods. There are a number of input parameters to be prepared for the numerical analysis. Some of them are well understood, while some are not. This paper presents some results of sensitivity analysis of the basic input parameters in numerical modelling of blasting problems so as to provide sound understanding of the parameters and some guidelines for input preparation.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124262065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-30DOI: 10.7474/TUS.2015.25.3.284
Youn-Kyou Lee
The generalized Hoek-Brown failure criterion, the strength parameters of which are determined by using the GSI index, is an empirical nonlinear failure criterion of rock mass and has been widely employed in various rock engineering practices. Many rock engineering practitioners, however, are still familiar with the description of the strength of rock mass in terms of friction angle and cohesion. In addition, almost all rock mechanics softwares incorporate the simple linear Mohr-Coulomb function. Therefore, it is necessary to provide a tool to implement the Hoek-Brown function in the framework of the Mohr-Coulomb criterion. In this study, the use of upper-bound solution of limit analysis for bearing capacity of a strip footing resting on the ground surface is proposed for the estimation of the equivalent friction angle and cohesion of rock mass incorporating the generalized Hoek-Brown failure criterion. The upper-bound bearing capacity is expressed in terms of friction angle by use of the relationship between tangential friction angle and tangential cohesion implied in the generalized Hoek-Brown function. The friction angle minimizing the upper-bound bearing capacity is taken as the equivalent friction angle. Through the illustrative implementations of the proposed method, the influences of GSI, and D on the equivalent friction angle and cohesion are investigated.
{"title":"Estimation of Equivalent Friction Angle and Cohesion of Near-Surface Rock Mass Using the Upper-Bound Solution for Bearing Capacity of Strip Footing","authors":"Youn-Kyou Lee","doi":"10.7474/TUS.2015.25.3.284","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.3.284","url":null,"abstract":"The generalized Hoek-Brown failure criterion, the strength parameters of which are determined by using the GSI index, is an empirical nonlinear failure criterion of rock mass and has been widely employed in various rock engineering practices. Many rock engineering practitioners, however, are still familiar with the description of the strength of rock mass in terms of friction angle and cohesion. In addition, almost all rock mechanics softwares incorporate the simple linear Mohr-Coulomb function. Therefore, it is necessary to provide a tool to implement the Hoek-Brown function in the framework of the Mohr-Coulomb criterion. In this study, the use of upper-bound solution of limit analysis for bearing capacity of a strip footing resting on the ground surface is proposed for the estimation of the equivalent friction angle and cohesion of rock mass incorporating the generalized Hoek-Brown failure criterion. The upper-bound bearing capacity is expressed in terms of friction angle by use of the relationship between tangential friction angle and tangential cohesion implied in the generalized Hoek-Brown function. The friction angle minimizing the upper-bound bearing capacity is taken as the equivalent friction angle. Through the illustrative implementations of the proposed method, the influences of GSI, and D on the equivalent friction angle and cohesion are investigated.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126320564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-30DOI: 10.7474/TUS.2015.25.3.221
Sebeom Park, Yosoon Choi
This study examined and analyzed several mine management software programs developed in domestic and oversea countries. In the oversea countries, many companies have developed and commercialized mine management softwares such as Dispatch, and FARA. These softwares provide many functionalities including real-time machine tracking, machine assignment optimization, productivity management, equipment health monitoring and remote control. For the domestic cases, this study reviewed two software programs (i.e., GEMISIMS, Truck-Shovel fleet optimization) developed by several researchers because there is no mine management software currently commercialized in Korea. In addition, this paper reports the two cases at the Jwaneng mine in Botswana and at the Robinson mine in United States where mine management software programs are used to support mine operations.
{"title":"Development and Utilization of Mine Management Software: A Review","authors":"Sebeom Park, Yosoon Choi","doi":"10.7474/TUS.2015.25.3.221","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.3.221","url":null,"abstract":"This study examined and analyzed several mine management software programs developed in domestic and oversea countries. In the oversea countries, many companies have developed and commercialized mine management softwares such as Dispatch, and FARA. These softwares provide many functionalities including real-time machine tracking, machine assignment optimization, productivity management, equipment health monitoring and remote control. For the domestic cases, this study reviewed two software programs (i.e., GEMISIMS, Truck-Shovel fleet optimization) developed by several researchers because there is no mine management software currently commercialized in Korea. In addition, this paper reports the two cases at the Jwaneng mine in Botswana and at the Robinson mine in United States where mine management software programs are used to support mine operations.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115908790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-30DOI: 10.7474/TUS.2015.25.3.275
Ki Ho Kim, Jong-Se Lim, Won-Yil Jang
Excavation of underground space in soft ground implicate to the structure, such as subsidence. As a result, it has been acting as a serious risk to the stability of the roads and facilities. Therefore, in order to stabilize the soil stabilization and reinforcement of the structure, we have been using a number of methods and injecting material. In this study, we compared and analyzed the amount of subsidence regarding the ground reinforcement during underground excavation in soft ground by performing model test. And three-dimensional numerical analysis was performed using FLAC 3D. The subsidence was simulated numerically according to the tunnel excavation. The subsidence results of the model tests and numerical analyzes were relatively consistent. Thus comparing the ground subsidence by varying the reinforcement area on the numerical analysis was analyzed. As a results, three-dimensional numerical simulation could be regarded to simulate better on the ground subsidence by various kinds of underground excavation and it can be used as a material of subsidence prevention methods.
{"title":"A Study on the Upper Ground Reinforcement Effect in Underground Cavern","authors":"Ki Ho Kim, Jong-Se Lim, Won-Yil Jang","doi":"10.7474/TUS.2015.25.3.275","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.3.275","url":null,"abstract":"Excavation of underground space in soft ground implicate to the structure, such as subsidence. As a result, it has been acting as a serious risk to the stability of the roads and facilities. Therefore, in order to stabilize the soil stabilization and reinforcement of the structure, we have been using a number of methods and injecting material. In this study, we compared and analyzed the amount of subsidence regarding the ground reinforcement during underground excavation in soft ground by performing model test. And three-dimensional numerical analysis was performed using FLAC 3D. The subsidence was simulated numerically according to the tunnel excavation. The subsidence results of the model tests and numerical analyzes were relatively consistent. Thus comparing the ground subsidence by varying the reinforcement area on the numerical analysis was analyzed. As a results, three-dimensional numerical simulation could be regarded to simulate better on the ground subsidence by various kinds of underground excavation and it can be used as a material of subsidence prevention methods.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126446035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thin Spray-on Liner (TSL) has been considered as a new rock support to replace shotcrete as well as wire mesh. However, the development of its original production technology is highly in demand since it is not open to the public. Therefore, two kinds of powder-type TSL prototypes were developed as the first development stage. Then, their mechanical properties were experimentally compared with those of a two-component foreign TSL material including both of liquid and powder components. From a series of experiments, the first TSL prototype mixing condition satisfied every TSL performance requirements specified by EFNRAC (2008), and showed much higher tensile and bond strengths than those of the two-component foreign TSL, even though the other TSL prototype cannot be used as a support member since its elongation at break is much lower than its corresponding EFNARC (2008) performance criterion. In addition, a further study to increase the ductility of the first TSL prototype might be necessary to guarantee its higher applicability to field conditions.
{"title":"Development of a Powder-type Thin Spray-on Liner and Its Performance Evaluation at Different Curing Ages","authors":"Soo-Ho Chang, Gyu-Phil Lee, Jin-Tae Han, Soon-Ju Choi, Gwi-Sung Hwang, Myung-Sik Choi","doi":"10.7474/TUS.2015.25.3.293","DOIUrl":"https://doi.org/10.7474/TUS.2015.25.3.293","url":null,"abstract":"Thin Spray-on Liner (TSL) has been considered as a new rock support to replace shotcrete as well as wire mesh. However, the development of its original production technology is highly in demand since it is not open to the public. Therefore, two kinds of powder-type TSL prototypes were developed as the first development stage. Then, their mechanical properties were experimentally compared with those of a two-component foreign TSL material including both of liquid and powder components. From a series of experiments, the first TSL prototype mixing condition satisfied every TSL performance requirements specified by EFNRAC (2008), and showed much higher tensile and bond strengths than those of the two-component foreign TSL, even though the other TSL prototype cannot be used as a support member since its elongation at break is much lower than its corresponding EFNARC (2008) performance criterion. In addition, a further study to increase the ductility of the first TSL prototype might be necessary to guarantee its higher applicability to field conditions.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122409028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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