Pub Date : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8568
Xiaopeng Su, Xiangyan Ren, Lei Zhou, Junchao Chen, Xu Wei
Fracture permeability is one of the critical factors affecting thermal production in hot dry rock reservoirs. Mechanical creep can cause temporal reduction of fracture permeability. However, the study solely on mechanical creep is limited, particularly under high confining stress. In addition, a physics-based stress- and time-dependent permeability model is essential for predicting the in situ geothermal production. This work aims to study the mechanical creep on the time-dependent fracture permeability. Long-term flow tests through single fractured granite samples under constant loading (20, 35, and 50 MPa, respectively) and stepwise increased loading (20 → 35 → 50 MPa) were conducted. The influence of the loading stress on the creep rate and the influence of the time on the permeability damage were quantitatively investigated. Based on the experimental data, a permeability model considering both stress and time effects was established based on viscous–elastic mechanics. According to the study, we obtained the following conclusions: (1) A higher constant confining stress can result in larger creep deformation, a larger damage ratio of hydraulic aperture (eh), and a longer duration of rapid reduction of eh. (2) The previously accumulated creep deformation can affect the subsequent time effect on the temporal evolution of eh when the loading stress changes, causing eh rapid reduction stage to weaken or disappear. (3) The transient creep behavior of eh can be described by the Kelvin creep model, and the maximum damage caused by the creep deformation is almost linearly proportional to the loading stress. The increase in stress caused by the bridging effect between adjacent contact asperities can dramatically reduce the creep rate. (4) The established permeability model can effectively predict the permeability with change in both stress and time considering the effect of accumulated creep deformation on the subsequent creep deformation, and it can be easily implemented in numerical simulation.
{"title":"Experimental and Model Study on the Time-Dependent Permeability of Rock Fractures Induced by Mechanical Creep","authors":"Xiaopeng Su, Xiangyan Ren, Lei Zhou, Junchao Chen, Xu Wei","doi":"10.1061/ijgnai.gmeng-8568","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8568","url":null,"abstract":"Fracture permeability is one of the critical factors affecting thermal production in hot dry rock reservoirs. Mechanical creep can cause temporal reduction of fracture permeability. However, the study solely on mechanical creep is limited, particularly under high confining stress. In addition, a physics-based stress- and time-dependent permeability model is essential for predicting the in situ geothermal production. This work aims to study the mechanical creep on the time-dependent fracture permeability. Long-term flow tests through single fractured granite samples under constant loading (20, 35, and 50 MPa, respectively) and stepwise increased loading (20 → 35 → 50 MPa) were conducted. The influence of the loading stress on the creep rate and the influence of the time on the permeability damage were quantitatively investigated. Based on the experimental data, a permeability model considering both stress and time effects was established based on viscous–elastic mechanics. According to the study, we obtained the following conclusions: (1) A higher constant confining stress can result in larger creep deformation, a larger damage ratio of hydraulic aperture (eh), and a longer duration of rapid reduction of eh. (2) The previously accumulated creep deformation can affect the subsequent time effect on the temporal evolution of eh when the loading stress changes, causing eh rapid reduction stage to weaken or disappear. (3) The transient creep behavior of eh can be described by the Kelvin creep model, and the maximum damage caused by the creep deformation is almost linearly proportional to the loading stress. The increase in stress caused by the bridging effect between adjacent contact asperities can dramatically reduce the creep rate. (4) The established permeability model can effectively predict the permeability with change in both stress and time considering the effect of accumulated creep deformation on the subsequent creep deformation, and it can be easily implemented in numerical simulation.","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":"60 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8319
Manjun Li, Binghan Xue, Hongyuan Fang, Shu Zhang, F. Wang
{"title":"Parameter Sensitivity Analysis of Polyurethane Cutoff Walls for Earth Dams under Multifield Coupling","authors":"Manjun Li, Binghan Xue, Hongyuan Fang, Shu Zhang, F. Wang","doi":"10.1061/ijgnai.gmeng-8319","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8319","url":null,"abstract":"","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47992905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8622
Weiru Zhou, Chunshun Zhang, Lei He, Junfeng Qian, R. Shi
{"title":"A Thermodynamically Consistent 3D Breakage Model Considering Intermediate Principal Stress for Granular Crushing Problems","authors":"Weiru Zhou, Chunshun Zhang, Lei He, Junfeng Qian, R. Shi","doi":"10.1061/ijgnai.gmeng-8622","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8622","url":null,"abstract":"","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43365707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8493
Behrouz Abdolsamadi Bonab, M. Oliaei
{"title":"Cyclic and Postcyclic Pullout Resistance of Soil Nail","authors":"Behrouz Abdolsamadi Bonab, M. Oliaei","doi":"10.1061/ijgnai.gmeng-8493","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8493","url":null,"abstract":"","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43243994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8487
Chang Liu, Chengdong Yan, Gang Zheng, Tao Liu, Yuhang Yang
{"title":"Field Testing and Numerical Analysis of Supporting Performance of Oblique Piles Used in Pit Excavation","authors":"Chang Liu, Chengdong Yan, Gang Zheng, Tao Liu, Yuhang Yang","doi":"10.1061/ijgnai.gmeng-8487","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8487","url":null,"abstract":"","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47580371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8576
Hong-Hu Zhu, Tian-Cheng Xie, Wei Zhang, S. Shukla
{"title":"Numerical Simulations of a Strip Footing on the Soil Slope with a Buried Pipe Using the Material Point Method","authors":"Hong-Hu Zhu, Tian-Cheng Xie, Wei Zhang, S. Shukla","doi":"10.1061/ijgnai.gmeng-8576","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8576","url":null,"abstract":"","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58581816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8532
Sina Sadeghfam, Marjan Moazamnia, Rahman Khatibi
The safety factor (SF) in riverbank stability problems for noncohesive soils is treated mathematically in this article to unravel its inherent bimodality, as stipulated by the cusp catastrophe technique in a hyperspace. The developed methodology may be contrasted with traditional approaches delineating the SF space to failure and operational states. The emerging three states are a significant shift from traditional treatments overlooking bimodality. The mathematical treatment presented in the technical note incorporates classic soil equations for noncohesive soils into the cusp catastrophe technique, with clear formulations at multiple levels of a potential function, including the energy level. The integrated mathematical expressions use soil properties to express lower order properties such as catastrophe flags, for example, bifurcation sets, hysteresis, and bimodality delineating sudden and gradual change in the state of a system. These equations show that even the SF of operational states depends on soil properties and gravity, and therefore a safe use of the SF requires a deep knowledge of the SF hyperspace.Practical ApplicationsPractical applications of the new mathematical development presented in the technical note may be viewed in three steps. In Step 1, the tacit nature of the cusp catastrophe bimodality of safety factor in riverbank stability problems needs to be tested through experimental data. The laboratory tests and fieldwork can be designed to encompass the full range of cases comprising: (i) the failure region; (ii) the operational region; and (iii) their bimodal zone. In Step 2, the existence of the three cases is verified by various applications to underpin the dependency of the safety factor on soil parameters. In Step 3, this new knowledge is realized by wide applications to gain an insight into behaviors of safety factors in wide-ranging problems such as natural slopes, channels, embankments, riverbanks, and levees.
{"title":"Mathematical Treatment of Bimodality for the Safety Factor in Riverbank Stability Analysis Using Cusp Catastrophe","authors":"Sina Sadeghfam, Marjan Moazamnia, Rahman Khatibi","doi":"10.1061/ijgnai.gmeng-8532","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8532","url":null,"abstract":"The safety factor (SF) in riverbank stability problems for noncohesive soils is treated mathematically in this article to unravel its inherent bimodality, as stipulated by the cusp catastrophe technique in a hyperspace. The developed methodology may be contrasted with traditional approaches delineating the SF space to failure and operational states. The emerging three states are a significant shift from traditional treatments overlooking bimodality. The mathematical treatment presented in the technical note incorporates classic soil equations for noncohesive soils into the cusp catastrophe technique, with clear formulations at multiple levels of a potential function, including the energy level. The integrated mathematical expressions use soil properties to express lower order properties such as catastrophe flags, for example, bifurcation sets, hysteresis, and bimodality delineating sudden and gradual change in the state of a system. These equations show that even the SF of operational states depends on soil properties and gravity, and therefore a safe use of the SF requires a deep knowledge of the SF hyperspace.Practical ApplicationsPractical applications of the new mathematical development presented in the technical note may be viewed in three steps. In Step 1, the tacit nature of the cusp catastrophe bimodality of safety factor in riverbank stability problems needs to be tested through experimental data. The laboratory tests and fieldwork can be designed to encompass the full range of cases comprising: (i) the failure region; (ii) the operational region; and (iii) their bimodal zone. In Step 2, the existence of the three cases is verified by various applications to underpin the dependency of the safety factor on soil parameters. In Step 3, this new knowledge is realized by wide applications to gain an insight into behaviors of safety factors in wide-ranging problems such as natural slopes, channels, embankments, riverbanks, and levees.","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":"287 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-8946
Lifeng Wen, Li Wu, Yanlong Li
The foundation and dam body below the seepage-free surface are in a saturated seepage state for a concrete-face rockfill dam (CFRD) built on a deep alluvium foundation. The seepage and stress coupling effect could influence the dam deformation behavior. This study focuses on the seepage–creep coupling behavior of the CFRD on alluvium. The Drucker–Prager (D–P) plastic and time-hardening creep models are used to describe the instantaneous and creep deformations of rockfill and alluvium materials. The back propagation (BP) neural network method is adopted to invert the material creep model parameters. The dam and foundation seepage process is described using Signorini’s type variational inequality method. A seepage–creep coupling analysis method for CFRDs on alluvium is proposed on the basis of the momentum conservation principle and the Kozeny–Carman equation. The deformation mechanism and evolution process of CFRD on alluvium are investigated whilst considering the seepage–creep coupling effect. The influence of the seepage effect on the dam’ long-term deformation is discussed.
{"title":"Seepage–Creep Coupling Analysis of Concrete-Face Rockfill Dam Built on Alluvium Foundation","authors":"Lifeng Wen, Li Wu, Yanlong Li","doi":"10.1061/ijgnai.gmeng-8946","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-8946","url":null,"abstract":"The foundation and dam body below the seepage-free surface are in a saturated seepage state for a concrete-face rockfill dam (CFRD) built on a deep alluvium foundation. The seepage and stress coupling effect could influence the dam deformation behavior. This study focuses on the seepage–creep coupling behavior of the CFRD on alluvium. The Drucker–Prager (D–P) plastic and time-hardening creep models are used to describe the instantaneous and creep deformations of rockfill and alluvium materials. The back propagation (BP) neural network method is adopted to invert the material creep model parameters. The dam and foundation seepage process is described using Signorini’s type variational inequality method. A seepage–creep coupling analysis method for CFRDs on alluvium is proposed on the basis of the momentum conservation principle and the Kozeny–Carman equation. The deformation mechanism and evolution process of CFRD on alluvium are investigated whilst considering the seepage–creep coupling effect. The influence of the seepage effect on the dam’ long-term deformation is discussed.","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":"286 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2023-11-01DOI: 10.1061/ijgnai.gmeng-7919
Sougata Mukherjee, G. S. Sivakumar Babu
{"title":"Probabilistic Evaluation of the Uplift Capacity of Transmission Tower Foundations Using Reinforced Anchors","authors":"Sougata Mukherjee, G. S. Sivakumar Babu","doi":"10.1061/ijgnai.gmeng-7919","DOIUrl":"https://doi.org/10.1061/ijgnai.gmeng-7919","url":null,"abstract":"","PeriodicalId":14100,"journal":{"name":"International Journal of Geomechanics","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43703507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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