Pub Date : 2014-02-28DOI: 10.7474/TUS.2014.24.1.067
Y. Jung, D. Cheon, E. Park, Chan Park, Yun-Su Lee, Chulwhan Park, Byung-Hee Choi
Long-term stability and delayed failure of granite were evaluated through the laboratory test based on Wilkins method and Brazilian disc test (BDT) which yields tensile strength, mode I fracture toughness and subcritical crack growth parameters. Then, the long-term strength of granite was estimated by using analytical models and long-term stability of compressed air-energy storage (CAES) pilot cavern pressurized up to 5 ~ 6 MPa was evaluated using numerical code, FRACOD with the determined subcritical crack growth parameters. The results of test and analyses showed that the subcritical crack growth index, n was determined as 29.39 and the inner pressure of 5 ~ 6 MPa had an insignificant effect on the long-term stability of pilot cavern. It was also found that the measurement and analysis of acoustic emission events can describe the accumulation of damage due to subcritical crack growth quantitatively. That is, AE monitoring can provide the current status of rock under loading if we make an identical installation condition in the field with that of the laboratory test.
{"title":"Estimation of the Characteristics of Delayed Failure and Long-term Strength of Granite by Brazilian Disc Test","authors":"Y. Jung, D. Cheon, E. Park, Chan Park, Yun-Su Lee, Chulwhan Park, Byung-Hee Choi","doi":"10.7474/TUS.2014.24.1.067","DOIUrl":"https://doi.org/10.7474/TUS.2014.24.1.067","url":null,"abstract":"Long-term stability and delayed failure of granite were evaluated through the laboratory test based on Wilkins method and Brazilian disc test (BDT) which yields tensile strength, mode I fracture toughness and subcritical crack growth parameters. Then, the long-term strength of granite was estimated by using analytical models and long-term stability of compressed air-energy storage (CAES) pilot cavern pressurized up to 5 ~ 6 MPa was evaluated using numerical code, FRACOD with the determined subcritical crack growth parameters. The results of test and analyses showed that the subcritical crack growth index, n was determined as 29.39 and the inner pressure of 5 ~ 6 MPa had an insignificant effect on the long-term stability of pilot cavern. It was also found that the measurement and analysis of acoustic emission events can describe the accumulation of damage due to subcritical crack growth quantitatively. That is, AE monitoring can provide the current status of rock under loading if we make an identical installation condition in the field with that of the laboratory test.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125483099","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 : 2014-02-28DOI: 10.7474/TUS.2014.24.1.055
Youngjin Son, Jaedong Kim, W. Jeong, Jong-Hoon Kim, Ki-Seog Kim
In this study, a joint survey system was developed to efficiently analyze geometrical characteristics of joint structures in rock mass using photogrammetric technique. The system includes both hardware and software. The hardware consists of a high resolution image camera for photographing image of a surface of rock body, a direction controlling system for adjusting the attitude of camera, and a digital compass for measuring the rotation angle of camera. The software was also developed in order to analyze the orientation, density, mean length of joints revealed on the images of rock surfaces. The software developed in this study was named as JointeXtractor. As applying this system into several field measurements, the orientation, density, mean length of joints could be quantitatively measured through analyzing the images of rock surfaces, in which the case of a difficult-to-access area was especially included for the test of the system.
{"title":"Development of Joint Survey System using Photogrammetric Technique","authors":"Youngjin Son, Jaedong Kim, W. Jeong, Jong-Hoon Kim, Ki-Seog Kim","doi":"10.7474/TUS.2014.24.1.055","DOIUrl":"https://doi.org/10.7474/TUS.2014.24.1.055","url":null,"abstract":"In this study, a joint survey system was developed to efficiently analyze geometrical characteristics of joint structures in rock mass using photogrammetric technique. The system includes both hardware and software. The hardware consists of a high resolution image camera for photographing image of a surface of rock body, a direction controlling system for adjusting the attitude of camera, and a digital compass for measuring the rotation angle of camera. The software was also developed in order to analyze the orientation, density, mean length of joints revealed on the images of rock surfaces. The software developed in this study was named as JointeXtractor. As applying this system into several field measurements, the orientation, density, mean length of joints could be quantitatively measured through analyzing the images of rock surfaces, in which the case of a difficult-to-access area was especially included for the test of the system.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133372867","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 : 2014-02-28DOI: 10.7474/TUS.2014.24.1.021
K. Min, Linmao Xie, Hanna Kim, Jaewon Lee
Abstract In order to generate electricity from geothermal energy for non-volcanic region, the concept of enhanced geothermal system (EGS) is introduced which forms an artificial reservoir by injecting high pressure fluid to 5 km deep and circulating geothermal fluid through the reservoir. Demonstration studies have been conducted in various countries and regions for determining the feasibility of EGS. In this technical note, experiences, errors, and implications of EGS demonstration projects in UK Rosemanowes and Australia Cooper Basin which have been carried out since 2002 are introduced to be used for the EGS demonstration project in Korea. Key words Geothermal energy, EGS (Enhanced Geothermal System), Rosemanowes, Cooper basin초 록 심부 5 km 내외에 고압의 유체 주입에 의하여 인공저류층을 형성한 후 지열유체를 순환 생산하여 지열발전을 하는 인공저류층 지열시스템의 실현 가능성을 판단하기 위해 다양한 지역에서 인공저류층 지열시스템 실증연구가 진행되고 있다 . 본 기술보고는 영국 Rosemanowes 에서 진행된 EGS 실증연구와 호주 Cooper Basin에서 2002년 이래 진행되고 있는 EGS 적용 사례를 소개하여 해당 지역에서 진행된 연구의 경험 , 오류, 시사점 등을 정리하고 , 향후 한국에서의 실증연구에 활용하고자 작성되었다 .핵심어 지열에너지, 인공저류층 지열시스템 , Rosemanowes, Cooper basin
Abstract In order to generate electricity from geothermal energy for non-volcanic region;the concept of enhanced geothermal system (EGS) is introduced which forms an artificial reservoir by injecting high pressure fluid to 5 km deep and circulating geothermal fluid through the reservoir。Demonstration studies have been conducted in various countries and regions for determining the feasibility of EGS。这是technical note, experiences, errorsand implications of EGS demonstration projects in UK Rosemanowes and Australia Cooper Basin which have been carried out since 2002 are introduced to be used for the EGS demonstration project in Korea。Key words Geothermal energy, EGS (Enhanced Geothermal System)， Rosemanowescooper basin初录深部5公里左右,根据高压流体注入人工形成的潜流层后,地热流体循环生产地热发电的人工潜流层地热系统实现的可能性,为了判断在不同的地区人工潜流层地热系统的实证研究正在进行。本技术报告的在英国rosemanowes进行egs实证研究和在澳大利亚cooper basin 2002年以来进行的egs适用案例介绍,在该地区进行的研究的经验整理、错误、启示》等,并将其用于今后在韩国的实证研究,拟定了。核心了地热能源、人工潜流层地热系统、rosemanowescooper basin
{"title":"EGS field case studies – UK Rosemanowes and Australian Cooper Basin projects","authors":"K. Min, Linmao Xie, Hanna Kim, Jaewon Lee","doi":"10.7474/TUS.2014.24.1.021","DOIUrl":"https://doi.org/10.7474/TUS.2014.24.1.021","url":null,"abstract":"Abstract In order to generate electricity from geothermal energy for non-volcanic region, the concept of enhanced geothermal system (EGS) is introduced which forms an artificial reservoir by injecting high pressure fluid to 5 km deep and circulating geothermal fluid through the reservoir. Demonstration studies have been conducted in various countries and regions for determining the feasibility of EGS. In this technical note, experiences, errors, and implications of EGS demonstration projects in UK Rosemanowes and Australia Cooper Basin which have been carried out since 2002 are introduced to be used for the EGS demonstration project in Korea. Key words Geothermal energy, EGS (Enhanced Geothermal System), Rosemanowes, Cooper basin초 록 심부 5 km 내외에 고압의 유체 주입에 의하여 인공저류층을 형성한 후 지열유체를 순환 생산하여 지열발전을 하는 인공저류층 지열시스템의 실현 가능성을 판단하기 위해 다양한 지역에서 인공저류층 지열시스템 실증연구가 진행되고 있다 . 본 기술보고는 영국 Rosemanowes 에서 진행된 EGS 실증연구와 호주 Cooper Basin에서 2002년 이래 진행되고 있는 EGS 적용 사례를 소개하여 해당 지역에서 진행된 연구의 경험 , 오류, 시사점 등을 정리하고 , 향후 한국에서의 실증연구에 활용하고자 작성되었다 .핵심어 지열에너지, 인공저류층 지열시스템 , Rosemanowes, Cooper basin","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126550705","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 : 2014-02-28DOI: 10.7474/TUS.2014.24.1.081
Youn-Kyou Lee
In the course of performing the stability analysis of rock structures, there are times when the strength of the Hoek-Brown rock mass needs to be understood in terms of the internal friction angle and cohesion. In this case, the original Hoek-Brown criteion, giving the relationship between and at failure, have to be transformed to the corresponding Mohr envelope. A new approach to derive the Mohr envelope of the Hoek-Brown criterion is suggested in this study. The new method is based on the Londe's transformation making the stress components dimensionless. The correctness of the derivation leading to the new relationship is confirmed by comparing the calculation results with the Bray's solution through a verification example.
{"title":"Derivation of Mohr Envelope of Hoek-Brown Failure Criterion Using Non-Dimensional Stress Transformation","authors":"Youn-Kyou Lee","doi":"10.7474/TUS.2014.24.1.081","DOIUrl":"https://doi.org/10.7474/TUS.2014.24.1.081","url":null,"abstract":"In the course of performing the stability analysis of rock structures, there are times when the strength of the Hoek-Brown rock mass needs to be understood in terms of the internal friction angle and cohesion. In this case, the original Hoek-Brown criteion, giving the relationship between and at failure, have to be transformed to the corresponding Mohr envelope. A new approach to derive the Mohr envelope of the Hoek-Brown criterion is suggested in this study. The new method is based on the Londe's transformation making the stress components dimensionless. The correctness of the derivation leading to the new relationship is confirmed by comparing the calculation results with the Bray's solution through a verification example.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"309 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114273660","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 : 2014-02-28DOI: 10.7474/TUS.2014.24.1.001
Sebeom Park, Yosoon Choi, Han-Su Park
This paper presents a case study that performed simulations on shovel-truck haulage systems in an open-pit mine by considering truck's breakdown and crusher's capacity. The SSangyoung limestone open-pit mine in Korea was selected as a study area and investigated to design the simulation algorithms. The GPSS/H simulation language is used to implement the simulation algorithms as a console application(simulator). The values of input parameters for simulator were measured by field investigation in the study area. The simulation results showed that 7 trucks can maximize the daily profit of haulage operations(i.e., 73,775 USD) when considers the frequency of trucks' breakdown as 1/40 hour -1 . In addition, the crusher capacity of 1300 tph is required to improve the efficiency of
{"title":"Simulation of Shovel-Truck Haulage Systems in Open-pit Mines by Considering Breakdown of Trucks and Crusher Capacity","authors":"Sebeom Park, Yosoon Choi, Han-Su Park","doi":"10.7474/TUS.2014.24.1.001","DOIUrl":"https://doi.org/10.7474/TUS.2014.24.1.001","url":null,"abstract":"This paper presents a case study that performed simulations on shovel-truck haulage systems in an open-pit mine by considering truck's breakdown and crusher's capacity. The SSangyoung limestone open-pit mine in Korea was selected as a study area and investigated to design the simulation algorithms. The GPSS/H simulation language is used to implement the simulation algorithms as a console application(simulator). The values of input parameters for simulator were measured by field investigation in the study area. The simulation results showed that 7 trucks can maximize the daily profit of haulage operations(i.e., 73,775 USD) when considers the frequency of trucks' breakdown as 1/40 hour -1 . In addition, the crusher capacity of 1300 tph is required to improve the efficiency of","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133664251","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 : 2013-12-31DOI: 10.7474/TUS.2013.23.6.572
Sangdong Lee
In this case study, I examined the microseismic safety management system of Deep Heat Mining Basel (DHMB) as EGS Geothermal Project which was conducted in Basel, Switzerland. EGS Geothermal Power projects which require induced seismic event by stimulation for creation of EGS geothermal reservoir have to be controlled pressure and flow rate of stimulation by establishment of microseismic safety management system. Traffic light system and Communication response procedure of DHMB project to respond step by step corresponding microseismic event intensity through continuous monitoring during stimulation period have been managed and established in advance of stimulation. However, the project was discontinued because of an earthquake to occur larger than expected one due to postinjection seismicity occurring in the geothermal reservoir after completion of injection for stimulation. The result of post analysis, Real-time traffic light system was verified to need a establishment of new microseismic safe management system to be considered post-injection seismicity phenomenon.
{"title":"Case Study of Microseismic Management Systems for Basel EGS Project","authors":"Sangdong Lee","doi":"10.7474/TUS.2013.23.6.572","DOIUrl":"https://doi.org/10.7474/TUS.2013.23.6.572","url":null,"abstract":"In this case study, I examined the microseismic safety management system of Deep Heat Mining Basel (DHMB) as EGS Geothermal Project which was conducted in Basel, Switzerland. EGS Geothermal Power projects which require induced seismic event by stimulation for creation of EGS geothermal reservoir have to be controlled pressure and flow rate of stimulation by establishment of microseismic safety management system. Traffic light system and Communication response procedure of DHMB project to respond step by step corresponding microseismic event intensity through continuous monitoring during stimulation period have been managed and established in advance of stimulation. However, the project was discontinued because of an earthquake to occur larger than expected one due to postinjection seismicity occurring in the geothermal reservoir after completion of injection for stimulation. The result of post analysis, Real-time traffic light system was verified to need a establishment of new microseismic safe management system to be considered post-injection seismicity phenomenon.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117103153","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 : 2013-12-31DOI: 10.7474/TUS.2013.23.6.581
J. Yoon, D. Bruhn, A. Zang
This article provides an overview on the geothermal energy research in Europe and one of the EU funded projects `GEISER (Geothermal Engineering Integrating Mitigation of Induced Seismicity in Reservoirs)` in which the authors were involved. More details are given for description of GEISER, in particular, about aims and discussions and how the project was managed. Emphasis is given to one of the work packages `Induced Seismicity and Large Magnitude Events (LME)` and results of this work package are summarized. This article intends to summarize the lessons learned in the GEISER project and give recommendations to future geothermal projects by creating Enhanced Geothermal Systems hydraulic stimulation where induced seismicity issues are expected to be a major issue and obstacle.
{"title":"Overview of Geothermal Energy Projects in Europe and the GEISER Project on Induced Seismicity","authors":"J. Yoon, D. Bruhn, A. Zang","doi":"10.7474/TUS.2013.23.6.581","DOIUrl":"https://doi.org/10.7474/TUS.2013.23.6.581","url":null,"abstract":"This article provides an overview on the geothermal energy research in Europe and one of the EU funded projects `GEISER (Geothermal Engineering Integrating Mitigation of Induced Seismicity in Reservoirs)` in which the authors were involved. More details are given for description of GEISER, in particular, about aims and discussions and how the project was managed. Emphasis is given to one of the work packages `Induced Seismicity and Large Magnitude Events (LME)` and results of this work package are summarized. This article intends to summarize the lessons learned in the GEISER project and give recommendations to future geothermal projects by creating Enhanced Geothermal Systems hydraulic stimulation where induced seismicity issues are expected to be a major issue and obstacle.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128789752","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 : 2013-12-31DOI: 10.7474/TUS.2013.23.6.547
E. Park
Abstract The importance of renewable energy has increased continuously due to the energy insecurity and the necessity of reducing carbon dioxide which is causing global climate change. In such a situation, the Pohang Enhanced Geothermal System (EGS) power plant project which is launched in December 2010 shall be a new opportunity for the development of EGS related technologies in Korea. In this paper, the case studies of Fenton Hill project in the USA and Hijiori project in Japan are introduced in order to help a part of the domestic EGS demonstration project. As a result, it could be helpful to minimize the trial and error of the domestic EGS project by acquiring the achievements and limitations of existing EGS projects. Key words EGS (Enhanced Geothermal System), Fenton Hill, Hijiori, hydraulic stimulation, Microseismic cloud초 록 최근 전 세계적으로 에너지 수급의 불안정 및 기후변화에 의한 이산화탄소 저감의 필요성으로 인하여 신재생에너지에 대한 중요성은 점차 증가하고 있다 . 이러한 상황에서 지난 2010년 12월에 시작되어 진행 중인 한국 최초의 포항 인공지열 저류층 생성 기술 (Enhanced Geothermal System; EGS) 지열발전소 프로젝트는 국내 EGS 관련기술 발전에 새로운 계기가 될 것이다 . 본 논문은 국내 EGS 실증사업에 일부분이라도 도움이 되고자 미국 Fenton Hill 및 일본 Hijiori 프로젝트 연구사례를 살펴보고 , 이를 통해 기존 EGS 프로젝트의 성과와 한계를 습득함으로써 국내 EGS 프로젝트의 시행착오를 최소화하는데 도움이 되고자 한다 .핵심어 인공저류층 지열시스템 , 펜톤 힐, 히지오리, 수리자극, 미소지진음 클라우드
Abstract The importance of renewable energy has increased continuously due to The energy insecurity and The necessity of reducing carbon dioxide which is causing global climate change。in such a situation,the Pohang Enhanced Geothermal System (EGS) power plant project which is launched in December 2010 shall be a new opportunity for the development of EGS related technologies in Korea。the case studies of Fenton Hill project In the USA and Hijiori project In Japan are introduced In order to help a part of the domestic EGS demonstration project。a result, it could be helpful to minimize the trial and error of the domestic EGS project by acquiring the achievements and limitations of existing EGS projects。“Key words EGS (Enhanced Geothermal System)”、“Fenton Hill”、“Hijiori”、“hydraulic stimulation”、“Microseismic cloud超绿”等最近在全世界范围内，由于能源供求的不稳定及气候变化引起的二氧化碳减少的必要性，对新再生能源的重要性正在逐渐增加。在这种情况下，2010年12月开始进行的韩国最早的浦项人工地热底流层生成技术(Enhanced Geothermal System;EGS)地热发电站项目将成为国内EGS相关技术发展的新契机。本文对国内egs实证工作一部分,即使想帮助美国fenton克里斯托弗及日本hijiori项目研究事例,察看,并通过现有egs掌握项目的成果和局限性,使国内egs项目的错误,想要成为有助于最小化。核心人工潜流层地热系统,不被笔吨,希鸭,水利微笑刺激,地震云音
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Pub Date : 2013-12-31DOI: 10.7474/TUS.2013.23.6.506
K. Min, Yoonho Song, W. Yoon
Abstract While geothermal energy provides the only base-load power among renewable energy sources, its development has been carried out predominantly in volcanic area. EGS (Enhanced Geothermal System) is a ubiquitous technology that can allow the geothermal power generation virtually in any area. This manuscript introduces the current state-of-the-art of EGS development in the world and presents the hydraulic stimulation technology and associated microseismicity which are key technical component in EGS. Finally this paper suggests the key research areas required in Korea for further development of EGS. Key words Geothermal energy, EGS (Enhanced Geothermal System), Hydraulic stimulation, Hydraulic fracturing, Hydrauilc shearing초 록 지열에너지는 기저부하를 제공하는 신재생에너지이나 현재까지 화산지대에만 대부분의 지열발전이 이루어져 왔다. 인공저류층 지열시스템 (Enhanced Geothermal System, EGS)는 비화산지대의 지열발전을 가능하게 할 개념으로 알려져 있으며 수리자극 (hydraulic stimulation)이 핵심기술이다. 본 논문은 EGS지열발전의 개발 현황을 소개하고 , 수압파쇄와 수리전단이 주 메커니즘인 수리자극의 핵심원리 , 설계변수 및 수리자극에 수반되어 발생하는 미소진동의 원리 및 관측기술을 소개한다 . 한국에서의 EGS 지열발전을 위하여 필요한 과제를 소개하여 향후 기술개발의 방향을 제시한다 .핵심어 지열에너지, 인공 저류층 지열시스템 , 수리자극, 수압파쇄, 수리전단
Abstract While geothermal energy provides the only base-load power among renewable energy sources, its development has been carried out predominantly in volcanic area。EGS (Enhanced Geothermal System) is a ubiquitous technology that can allow the Geothermal power generation virtually in any area。This manuscript introduces the current state-of-the art of EGS development in the world and presents the hydraulic stimulation technology and associated microseismicity which are key technicalcomponent in egs。Finally this paper suggests the key research areas required in Korea for further development of EGS。Key words Geothermal energy, EGS (Enhanced Geothermal System)， Hydraulic stimulation, Hydraulic fracturing, Hydrauilc shearing超绿地热能源是提供基底负荷的新再生能源，但是到目前为止，大部分地热发电都是在火山地带进行的。人工底流层地热系统(Enhanced Geothermal System, EGS)被认为是使非火山地带的地热发电成为可能的概念，其核心是水利刺激。本论文介绍了EGS地热发电的开发现状，介绍了以水压粉碎和修理传单为主要机制的修理刺激的核心原理、设计变数及伴随修理刺激发生的微小振动的原理及观测技术。在此介绍EGS地热发电在韩国所必需的课题，为今后的技术开发指明方向。
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Pub Date : 2013-12-31DOI: 10.7474/TUS.2013.23.6.521
Chung-In Lee, K. Min
While microseismicity induced by hydraulic stimulation carried out for EGS is useful means in estimating the range of permeability increase, it also affect surface structures and environments. In order to establish a mitigation plan for microseismicity triggered by hydraulic stimulation, we reviewed world-wide guidelines on the impact of ground vibration on the surface structure and human environment by blasting. Case studies from Europe and USA on the microseismicity by hydraulic stimulation are presented and suggestions are made for the guidelines on ground vibration by hydraulic stimulation for the ongoing Pohang EGS project.
{"title":"Effect of Ground Vibration on Surface Structures and Human Environments -Application of Blasting Vibration to Induced Seismicity in EGS Hydraulic Stimulation-","authors":"Chung-In Lee, K. Min","doi":"10.7474/TUS.2013.23.6.521","DOIUrl":"https://doi.org/10.7474/TUS.2013.23.6.521","url":null,"abstract":"While microseismicity induced by hydraulic stimulation carried out for EGS is useful means in estimating the range of permeability increase, it also affect surface structures and environments. In order to establish a mitigation plan for microseismicity triggered by hydraulic stimulation, we reviewed world-wide guidelines on the impact of ground vibration on the surface structure and human environment by blasting. Case studies from Europe and USA on the microseismicity by hydraulic stimulation are presented and suggestions are made for the guidelines on ground vibration by hydraulic stimulation for the ongoing Pohang EGS project.","PeriodicalId":437780,"journal":{"name":"Journal of Korean Society for Rock Mechanics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127812304","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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