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《Chinese Journal of Geotechnical Engineering》 2014-03
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A strain-softening model based on GSI softening

PENG Jun;RONG Guan;ZHOU Chuang-bing;CAI Ming;PENG Kun;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering(Wuhan University),Ministry of Education;Bharti School of Engineering,Laurentian University;China Shipbuilding,NDRI Engineering Co.,Ltd.;  
The Mohr-Coulomb and Hoek-Brown failure criteria are the two most widely used ones at present. To simulate brittle failure of rocks in deep tunnels, the models based on these two failure criteria have been proposed, including the CWFS(cohesion weakening and friction strengthening) model, the DISL(damage initiation and spalling limit) model, and the BDP(brittle ductile plastic) model. These models have been used to simulate brittle failure of hard rocks. However, because of the issues of strain hardening under high confinement and large ambiguity in model parameter determination, it is very challenging to apply these models in practical engineering application. Based on the variation of the GSI(geological strength index) value during compression of rocks and by defining the GSI value as a function of plastic strain and confinement, a strain-dependent GSI-softening model, which is based on the Hoek-Brown failure criterion, is proposed in this study. This model is implemented in FLAC3D to simulate the triaxial compression tests on T2b marble in Jinping-II Hydropower Station and the Tennessee marble. It is found that the proposed model is able to simulate the mechanical behaviors of the brittle-ductile transition observed in the triaxial compression tests on Jinping and Tennessee marbles. Finally, this model is used to evaluate the relaxation depth of a headrace tunnel in Jinping-II Hydropower Station, and the calculated depths are in good agreement with the field observations.
【Fund】: 国家重点基础研究发展计划(973计划)项目(2011CB013501 2010CB732005);; 新世纪优秀人才计划(NCET-11-0406);; 中央高校基本科研业务费专项项目(2012206020215)
【CateGory Index】: TU45
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【Citations】
Chinese Journal Full-text Database 2 Hits
1 YAN Peng1,2,3,LU Wenbo1,2,CHEN Ming1,2,SHAN Zhigang3,CHEN Xiangrong3(1.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,Hubei 430072,China;2.Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education,Wuhan University,Wuhan,Hubei 430072,China;3.HydroChina Huadong Engineering Corporation,Hangzhou,Zhejiang 310014,China);IN-SITU TEST RESEARCH ON INFLUENCE OF EXCAVATION METHOD ON INDUCED DAMAGE ZONE IN DEEP TUNNEL[J];岩石力学与工程学报;2011-06
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【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 LI Xinping;ZHAO Hang;LUO Yi;CHENG Zugang;SUN Changzhong;DONG Qian;YANG Yepeng;Hubei Key Laboratory of Road-bridge and Structure Engineering,Wuhan University of Technology;School of Civil Engineering and Architecture,Wuhan University of Technology;China Gezhouba Group Three Gorges Construction Engineering Co.,Ltd.;;EXPERIMENTAL STUDY OF PROPAGATION AND ATTENUATION OF ELASTIC WAVE IN DEEP ROCK MASS WITH JOINTS[J];岩石力学与工程学报;2015-11
2 YAO Chi;LI Yao;JIANG Qinghui;YANG Jianhua;ZHOU Chuangbing;School of Civil Engineering and Architecture,Nanchang University;School of Civil Engineering,Wuhan University;;NUMERICAL SIMULATION OF EXCAVATION DAMAGED ZONE USING THE MODIFIED RIGID BODY SPRING METHOD[J];岩石力学与工程学报;2015-10
3 LI Diyuan;XIE Tao;LI Xibing;WANG Tao;School of Resources and Safety Engineering, Central South University;;On the Mogi-Coulomb strength criterion as applied to rock triaxial unloading test[J];科技导报;2015-19
4 XU Ying;YUAN Pu;Engineering Research Center of Underground Mine Construction,Ministry of Education,Anhui University of Science and Technology;School of Civil Engineering and Architecture,Anhui University of Science and Technology;State Key Laboratory of Deep Coal Mining and Environment Protection,Huainan Mining Group Co.,Ltd.;;MODEL TEST OF ZONAL DISINTEGRATION IN DEEP ROCK UNDER BLASTING LOAD[J];岩石力学与工程学报;2015-S2
5 YANG Yunhao;WANG Renkun;XING Wanbo;CHENG Lijuan;Large-scale Underground Engineering Affiliation of National Hydropower Technology Research and Development Center,Hydro China Chengdu Engineering Corporation;;ANALYSIS OF DEFORMATION AND FAILURE OF HARD ROCK MASS SURROUNDING UNDERGROUND OPENINGS IN HOUZIYAN HYDROPOWER STATION BY 3DEC NUMERICAL SIMULATION[J];岩石力学与工程学报;2015-S2
6 LI Peng-fei;ZHAO Xing-guang;CAI Mei-feng;Beijing Research Institute of Uranium Geology;School of Civil and Environmental Engineering,University of Science and Technology Beijing;State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing;;Discussion on approaches to identifying cracking initiation stress of rocks under compression condition: A case study of Tianhu granodiorite in Xinjiang Autonomous Region[J];岩土力学;2015-08
7 LIU Quan-sheng;HUANG Xing;LIU Jian-ping;PAN Yu-cong;Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province,Wuhan University;State Key Laboratory of Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences;;Interaction and safety control between TBM and deep mixed ground[J];煤炭学报;2015-06
8 YAN Peng;XIE Liang-tao;FAN Yong;LU Wen-bo;CHEN Ming;ZHOU Chuang-bing;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education,Wuhan University;;Releasing mechanisms of strain energy during excavation of deep tunnels with different methods[J];煤炭学报;2015-S1
9 ZHOU Hui;MENG Fanzhen;ZHANG Chuanqing;YANG Fanjie;LU Jingjing;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences;;CHARACTERISTICS AND MECHANISM OF OCCURRENCE OF STRESS THRESHOLDS AND CORRESPONDING STRAIN FOR HARD ROCK[J];岩石力学与工程学报;2015-08
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【Secondary Citations】
Chinese Journal Full-text Database 9 Hits
1 Yan Peng1,2 Lu Wenbo2 Chen Ming2 Zhou Chuangbing2(1.East China Investigation and Design Institution Under CHECC,Hangzhou 310014,China;2.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China);Study of the damage characteristics of surrounding rocks for tunnels constructed using TBM and drill-and-blast[J];土木工程学报;2009-11
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