Pub Date : 2021-01-01DOI: 10.18690/actageotechslov.18.1.55-64.2021
Shiguo Xiao, Tingjun Chen
For traditional slice methods of limit equilibrium used to analyze slope stability, some hypothetical conditions on interslice force are generally introduced to solve the problem. In order to reduce the defect theoretically due to the related hypothesis, more rigorous constraints of interslice force are completely considered in light of static equilibrium conditions and energy dissipation principle of the interface between two adjacent slices. Without hypothesis of interslice force, the slope stability analysis is transformed consistently into a non-linear programming problem to be solved. So, a generally improved solution of slice method of limit equilibrium to slope stability is put forward. In particular, influence of the dilation angle of soil on slope stability can be involved in the method. The proposed method can be utilized for any slopes with arbitrary slip surfaces.
{"title":"Improved general slice method of limit equilibrium for slope stability analysis","authors":"Shiguo Xiao, Tingjun Chen","doi":"10.18690/actageotechslov.18.1.55-64.2021","DOIUrl":"https://doi.org/10.18690/actageotechslov.18.1.55-64.2021","url":null,"abstract":"For traditional slice methods of limit equilibrium used to analyze slope stability, some hypothetical conditions on interslice force are generally introduced to solve the problem. In order to reduce the defect theoretically due to the related hypothesis, more rigorous constraints of interslice force are completely considered in light of static equilibrium conditions and energy dissipation principle of the interface between two adjacent slices. Without hypothesis of interslice force, the slope stability analysis is transformed consistently into a non-linear programming problem to be solved. So, a generally improved solution of slice method of limit equilibrium to slope stability is put forward. In particular, influence of the dilation angle of soil on slope stability can be involved in the method. The proposed method can be utilized for any slopes with arbitrary slip surfaces.","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67766707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.18690/actageotechslov.18.2.2-14.2022
Qijian Zhou, R. Deng, L. Zheng, Quanbing Zhu, Q. Xie, X. Xue
In this paper the mechanical properties of mudstone with different immersion durations (e.g., immersion in water for 0, 7 and 14 days), at different temperatures (20, 35 and 50 °C) and in different confining pressures (0.6 and 1.2 MPa) were investigated using uniaxial compression tests, conventional triaxial compression tests and scanning electron microscopy. The test results indicate that in the temperature range from 20 °C to 50 °C the water content can significantly reduce the mechanical parameters, including the strength and elastic modulus of the mudstone samples. In contrast, the Poisson ratio of the mudstone samples increases with the increase in the water content. In addition, there is little difference between the effects of an immersion time of 7 days and 14 days on the mudstone samples, indicating that the confining pressure plays a protective role on the mudstone samples.
{"title":"Experimental investigation of the mechanical properties of mudstone in southwestern China","authors":"Qijian Zhou, R. Deng, L. Zheng, Quanbing Zhu, Q. Xie, X. Xue","doi":"10.18690/actageotechslov.18.2.2-14.2022","DOIUrl":"https://doi.org/10.18690/actageotechslov.18.2.2-14.2022","url":null,"abstract":"In this paper the mechanical properties of mudstone with different immersion durations (e.g., immersion in water for 0, 7 and 14 days), at different temperatures (20, 35 and 50 °C) and in different confining pressures (0.6 and 1.2 MPa) were investigated using uniaxial compression tests, conventional triaxial compression tests and scanning electron microscopy. The test results indicate that in the temperature range from 20 °C to 50 °C the water content can significantly reduce the mechanical parameters, including the strength and elastic modulus of the mudstone samples. In contrast, the Poisson ratio of the mudstone samples increases with the increase in the water content. In addition, there is little difference between the effects of an immersion time of 7 days and 14 days on the mudstone samples, indicating that the confining pressure plays a protective role on the mudstone samples.","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67767158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.18690/actageotechslov.17.1.33-45.2020
A. Lazar, d.o.o. Litijska cesta Ljubljana Slovenia Geoservis, T. Beguš, M. Vulić, d.o.o. Dimičeva ulica Ljubljana Slovenia Geotrias
{"title":"Integration of measurement techniques in monitoring of the Laze landslide in Slovenia","authors":"A. Lazar, d.o.o. Litijska cesta Ljubljana Slovenia Geoservis, T. Beguš, M. Vulić, d.o.o. Dimičeva ulica Ljubljana Slovenia Geotrias","doi":"10.18690/actageotechslov.17.1.33-45.2020","DOIUrl":"https://doi.org/10.18690/actageotechslov.17.1.33-45.2020","url":null,"abstract":"","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44017558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.18690/actageotechslov.17.1.23-32.2020
D. Stupar, A. Kos, M. Vulić, Slovenia Marmor Sežana d.d Sežana
It is not only that humans are playing with the environment, giving the quarry a bad external image, nature also returns a blow into the internal mass movements by decreasing the safety parameters of the room-and-pillar excavation. This paper presents the analytical methods used to observe the individual parameters in the context of monitoring the safety pillars and the deformation of the discontinuities in the underground excavation in the Lipica II natural stone mine. To monitor movements and deformations, the EL-beam gauges are installed on the surface of the safety pillars. The observations used in this case study are represented by two vertical EL-beam displacement measurements, acting as one year-long time series. Using ARMA modelling, we analysed the differences between the measured and predicted values of El-beam displacements. The obtained predictions of the displacements, their negligible effect on the measurements themselves, and the absence of any trends in the calculated differences, proves the feasibility of the applied prediction model. A longer observation period would allow predictions of possible seasonal characteristics of the time series, while the development of the automatic responding monitoring system, triggered by the warning events, will improve the reporting system for the sudden changes in the smoothness of the predicted values. Danijela Ignjatović Stupar International Space University 67400 Illkirch-Graffenstaden, France E-mail: danijela.stupar@isunet.edu Andrej Kos
这不仅仅是人类在玩弄环境，给采石场一个糟糕的外部形象，大自然也通过减少房间和柱子挖掘的安全参数来打击内部的群众运动。本文介绍了利皮卡2号天然石矿地下开挖过程中安全矿柱监测和结构面变形监测中单个参数观测的分析方法。为了监测移动和变形，el梁仪表安装在安全支柱的表面。本案例研究中使用的观测结果由两个垂直el梁位移测量值表示，作为一年的时间序列。利用ARMA模型，我们分析了el梁位移的实测值和预测值之间的差异。所得到的位移预测，其对测量本身的影响可以忽略不计，并且在计算的差异中没有任何趋势，证明了应用预测模型的可行性。较长的观察期可以预测时间序列可能的季节性特征，而由预警事件触发的自动响应监测系统的发展将改进预报数值平滑度突然变化的报告系统。Danijela ignjatovic, Stupar国际空间大学，67400 Illkirch-Graffenstaden, France . E-mail: danijela.stupar@isunet.edu Andrej Kos
{"title":"Observation of extensive mass movements in the Lipica II quarry with an EL beam displacement sensor","authors":"D. Stupar, A. Kos, M. Vulić, Slovenia Marmor Sežana d.d Sežana","doi":"10.18690/actageotechslov.17.1.23-32.2020","DOIUrl":"https://doi.org/10.18690/actageotechslov.17.1.23-32.2020","url":null,"abstract":"It is not only that humans are playing with the environment, giving the quarry a bad external image, nature also returns a blow into the internal mass movements by decreasing the safety parameters of the room-and-pillar excavation. This paper presents the analytical methods used to observe the individual parameters in the context of monitoring the safety pillars and the deformation of the discontinuities in the underground excavation in the Lipica II natural stone mine. To monitor movements and deformations, the EL-beam gauges are installed on the surface of the safety pillars. The observations used in this case study are represented by two vertical EL-beam displacement measurements, acting as one year-long time series. Using ARMA modelling, we analysed the differences between the measured and predicted values of El-beam displacements. The obtained predictions of the displacements, their negligible effect on the measurements themselves, and the absence of any trends in the calculated differences, proves the feasibility of the applied prediction model. A longer observation period would allow predictions of possible seasonal characteristics of the time series, while the development of the automatic responding monitoring system, triggered by the warning events, will improve the reporting system for the sudden changes in the smoothness of the predicted values. Danijela Ignjatović Stupar International Space University 67400 Illkirch-Graffenstaden, France E-mail: danijela.stupar@isunet.edu Andrej Kos","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48031230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.18690/actageotechslov.17.1.71-86.2020
Plaban Deb, S. Pal
{"title":"Load-settlement and load-sharing behaviour of a piled raft foundation resting on layered soils","authors":"Plaban Deb, S. Pal","doi":"10.18690/actageotechslov.17.1.71-86.2020","DOIUrl":"https://doi.org/10.18690/actageotechslov.17.1.71-86.2020","url":null,"abstract":"","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49491203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.18690/actageotechslov.17.1.46-55.2020
Andrej Pal, Ljubljana Slovenia Environment Aškerčeva, Mirko Borisov, M. Vulić, Ljubljana Slovenia Environment Aškerčeva cesta
{"title":"Modeling and analysis of digital surface models using high-resolution UAV images","authors":"Andrej Pal, Ljubljana Slovenia Environment Aškerčeva, Mirko Borisov, M. Vulić, Ljubljana Slovenia Environment Aškerčeva cesta","doi":"10.18690/actageotechslov.17.1.46-55.2020","DOIUrl":"https://doi.org/10.18690/actageotechslov.17.1.46-55.2020","url":null,"abstract":"","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47497941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.18690/actageotechslov.17.1.56-70.2020
Khayreddine Doumi, M. Belkhatir, A. C. Taiba, Y. Mahmoudi, W. Baille
{"title":"Experimental investigation of the influence of relative effective diameter on the ultimate shear strength of partially saturated granular soils","authors":"Khayreddine Doumi, M. Belkhatir, A. C. Taiba, Y. Mahmoudi, W. Baille","doi":"10.18690/actageotechslov.17.1.56-70.2020","DOIUrl":"https://doi.org/10.18690/actageotechslov.17.1.56-70.2020","url":null,"abstract":"","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47059068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.18690/actageotechslov.17.1.87-96.2020
Ping Li, Junjun Chen, Yaru Lv, Zhiyuan Wang, Xiaojin Chen, China Materials Nanjing, Nanjing Water Planning
This paper reports on a field test in Nanjing, China, performed to investigate the effects of excavation on shallow-buried pipelines by monitoring and analyzing the displacements of these pipelines. A parametric study is also carried out using the finite-element program ABAQUS to investigate the influence of the spatial effects of the pit excavation and the supporting-structure combination forms. The numerical simulations are verified by the field test. The results show that the first excavating area, which is farther from the existing buried pipeline, causes smaller displacements of the pipeline. When the slope angle of the existing bored piles increases from 0° to 15°, the maximum horizontal and vertical displacements decrease by 4.92 mm and 2.49 mm, respectively. Both the maximum horizontal and vertical displacements decrease by over 20% when the front row pile length is increased by 50%. An increase in the slope angle or the front row Ping Li
{"title":"Numerical investigation of the influence of spatial effects and supporting structures during pit excavation","authors":"Ping Li, Junjun Chen, Yaru Lv, Zhiyuan Wang, Xiaojin Chen, China Materials Nanjing, Nanjing Water Planning","doi":"10.18690/actageotechslov.17.1.87-96.2020","DOIUrl":"https://doi.org/10.18690/actageotechslov.17.1.87-96.2020","url":null,"abstract":"This paper reports on a field test in Nanjing, China, performed to investigate the effects of excavation on shallow-buried pipelines by monitoring and analyzing the displacements of these pipelines. A parametric study is also carried out using the finite-element program ABAQUS to investigate the influence of the spatial effects of the pit excavation and the supporting-structure combination forms. The numerical simulations are verified by the field test. The results show that the first excavating area, which is farther from the existing buried pipeline, causes smaller displacements of the pipeline. When the slope angle of the existing bored piles increases from 0° to 15°, the maximum horizontal and vertical displacements decrease by 4.92 mm and 2.49 mm, respectively. Both the maximum horizontal and vertical displacements decrease by over 20% when the front row pile length is increased by 50%. An increase in the slope angle or the front row Ping Li","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45696175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.18690/ACTAGEOTECHSLOV.17.2.46-55.2020
Chuan He, E. Liu, Qingke Nie
A series of triaxial compression tests was performed on artificially structured soil samples with an initial stress- -induced anisotropy at confining pressures of 25, 37.5, 50, 100, 200, and 400 kPa. Based on the results of these tests, a constitutive model for structured soils with initial stress-induced anisotropy was formulated. In the proposed model, the initially anisotropic structured soils are regarded as heterogeneous materials composed of bonded blocks and weaker bands. The bonded blocks (denoted as bonded elements) are described as transversely isotropic elastic– brittle materials, while the weaker bands (denoted as frictional elements) are described by the Lade–Duncan model of elastic–plastic materials. Based on the homogenization theorem for heterogeneous materials, and the introduction of structural parameters such as the breakage ratio and the local strain coefficient, the non-uniform distribution of stress and strain within a representative volume element was obtained. Finally, the parameters of the model were determined based on experimental results. The model was verified with test results, demonstrating that it can effectively capture many important features of artificially structured soils with an initial stress-induced anisotropy.
{"title":"Mechanical properties and constitutive model for artificially structured soils with an initial stress-induced anisotropy","authors":"Chuan He, E. Liu, Qingke Nie","doi":"10.18690/ACTAGEOTECHSLOV.17.2.46-55.2020","DOIUrl":"https://doi.org/10.18690/ACTAGEOTECHSLOV.17.2.46-55.2020","url":null,"abstract":"A series of triaxial compression tests was performed on artificially structured soil samples with an initial stress- -induced anisotropy at confining pressures of 25, 37.5, 50, 100, 200, and 400 kPa. Based on the results of these tests, a constitutive model for structured soils with initial stress-induced anisotropy was formulated. In the proposed model, the initially anisotropic structured soils are regarded as heterogeneous materials composed of bonded blocks and weaker bands. The bonded blocks (denoted as bonded elements) are described as transversely isotropic elastic– brittle materials, while the weaker bands (denoted as frictional elements) are described by the Lade–Duncan model of elastic–plastic materials. Based on the homogenization theorem for heterogeneous materials, and the introduction of structural parameters such as the breakage ratio and the local strain coefficient, the non-uniform distribution of stress and strain within a representative volume element was obtained. Finally, the parameters of the model were determined based on experimental results. The model was verified with test results, demonstrating that it can effectively capture many important features of artificially structured soils with an initial stress-induced anisotropy.","PeriodicalId":50897,"journal":{"name":"Acta Geotechnica Slovenica","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67766469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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