作者机构：
[Li Cong; Zhang Rong-tang; Wu Liang-liang; Liu Jie-sheng; Zhang Xin-zhou] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.;[Lu Bo; Li Cong; Zhu Jie-bing; Shen Xiao-ke; Wang Xiao-wei] Changjiang River Sci Res Inst, Minist Water Resources, Key Lab Geotech Mech & Engn, Wuhan 430010, Peoples R China.;[Wang Xiao-wei] Hohai Univ, Minist Educ Geomech & Embankment Engn, Key Lab, Nanjing 210098, Peoples R China.
通讯机构：
[Cong Li] S;School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, China<&wdkj&>Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, China
关键词：
Rock slope;Fractured rock mass;Freeze-thaw cycle;Model experiment;Stability degradation mechanism;Failure mode
摘要：
The stability of slope rock masses is influenced by freeze-thaw cycles in cold region, and the mechanism of stability deterioration is not clear. In order to understand the damage and progressive failure characteristics of rock masses under the action of freezing and thawing, a model test was conducted on slope with steep joint in this study. The temperature, frost heaving pressure and deformation of slope rock mass were monitored in real-time during the test and the progressive failure mode was studied. The experimental results show that the temperature variations of cracking and the rock mass of a slope are different. There are obvious latent heat stages in the temperature-change plot in the crack, but not in the slope rock masses. The frost heaving effect in the fracture is closely related to the constraint conditions, which change with the deformation of the fracture. The frost heaving pressure fluctuates periodically during freezing and continues to decrease during thawing. The surface deformation of the rock mass increases during freezing, and the deformation is restored when it thaws. Freeze-thaw cycling results in residual deformation of the rock mass which cannot be fully restored. Analysis shows that the rock mass at the free side of the steep-dip joint rotates slightly under the frost heaving effect, causing fracture propagation. The fracture propagation pattern is a circular arc at the beginning, then extends to the possible sliding direction of the rock mass. Frost heaving force and fracture water pressure are the key factors for the failure of the slope, which can cause the crack to penetrate the rock mass, and a landslide ensues when the overall anti-sliding resistance of the rock mass is overcome.
作者机构：
[Zhang Rong-tang; Zhao Neng-hao] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.;[Yi Qing-lin; Song Kun] China Three Gorges Univ, Key Lab Geol Hazards Three Gorges Reservoir Area, Minist Educ, Yichang 443002, Peoples R China.
通讯机构：
[Kun Song] K;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education, Yichang, China
关键词：
Ring shear model;Discrete element method;THM coupling;Frictional heating;Thermal pressurization
摘要：
In this study, a new numerical model of ring shear tester for shear band soil of landslide was established. The special feature of this model is that it considers the mechanism of friction-induced thermal pressurization, which is potentially an important cause of high-speed catastrophic landslides. The key to the construction of this numerical ring shear model is to realize the THM (thermo-hydro-mechanical) dynamic coupling of soil particles, which includes the processes of frictional heating, thermal pressurization, and strength softening during shearing of solid particles. All of these are completed by using discrete element method. Based on this new model, the characteristics of shear stress change with shear displacement, as well as the variation of temperature and pore pressure in the specimen, are studied at shear rates of 0.055 m/s, 0.06 m/s, 0.109 m/s and 1.09 m/s, respectively. The results show that the peak strength and residual strength of specimen are significantly reduced when the mechanism of friction-induced thermal pressurization is considered. The greater the shear rate is, the higher the temperature as well as the pore pressure is. The effect of shear rate on the shear strength is bidirectional. The simulation results demonstrate that this model can effectively simulate the mechanism of friction-induced thermal pressurization of shear band soil during ring shear process, and the shear strength softening in the process. The new numerical ring shear model established in this study is of great significance for studying the dynamic mechanism of high-speed catastrophic landslides.
作者机构：
[Li Cong; Zhang Rong-tang; Liu Jie-sheng] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hube, Peoples R China.;[Lu Bo; Li Cong; Zeng Ping; Zhu Jie-bing; Jiang Yu-zhou; Wang Bing] Changjiang River Sci Res Inst, Key Lab Geotech Mech & Engn, Minist Water Resources, Wuhan 430010, Peoples R China.;[Liu Zhi-jun] Guangzhou Baiyun Int Airport Co Ltd, Guangzhou 510406, Peoples R China.
通讯机构：
[Zhu Jie-bing] C;Changjiang River Sci Res Inst, Key Lab Geotech Mech & Engn, Minist Water Resources, Wuhan 430010, Peoples R China.
关键词：
Model test;Bedding slope;Prestressed anchorage;Corrosion;Electrochemical measurement
摘要：
The long-term stability of a prestressed anchored slope might be influenced by the durability of the anchorage structure. To understand long-term stability of anchored rock slopes, the research presented herein evaluated the performance evolution of a prestressed anchored bedding slope system in a corrosive environment by model test. The corrosion process in a prestressed anchor bar was monitored in terms of its open-circuit potential (OCP), corrosion current density (CCD), and electrochemical impedance spectroscopy (EIS). The stability of the prestressed anchored slope was evaluated by monitoring changes in anchorage force and displacements. The experimental results show that prestress and oxygen could reduce the corrosion resistance of the anchor bar, and anchor bars in a chloride-rich environment are very susceptible to corrosion. Prestressed tendons in a corrosive environment suffer a loss of anchorage force, the prestress decreases rapidly after locking, and the rate thereof decreases until stabilising; in the later stage, corrosion leads to the reduction of the cross-sectional area of the steel bar which may cause the reduction in anchorage force again. Anchorage force controls the deformation and stability of the anchored slope, the prestress loss caused by later corrosion may lead to an increased rate of displacement and stability degradation of the prestressed anchored rock slope.
作者机构：
[刘建荣; 任倩] School of Civil Engineering and Transportation, South China University of Technology, Guangzhou;Guangdong;510640, China;[刘志伟] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan;Hubei
作者机构：
[李炜明; 任虹; 汪为巍; 姚成毅] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, Hubei, 430023, China;[丁敬文; 张燕舞; 石旭东] China Railway 19th Bureau Group Co., Ltd., Beijing, 100176, China;[李炜明] Purdue University, West Lafayette, IN, 47906, United States;[李炜明] Hunan Province Research Center for Safety Control Technology and Equipment of Bridge Engineering, Changsha University of Science &, Technology, Changsha, Hunan, 410114, China
作者机构：
[刘建荣] School of Civil Engineering and Transportation, South China University of Technology, Guangzhou;Guangdong;510640, China;[刘志伟] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan;Hubei
作者机构：
[臧濛; 郭爱国; 孔令伟] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China;[臧濛] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, China
作者机构：
[蔡光华; 刘松玉] School of Transportation, Southeast University, Nanjing;210096, China;[陆海军] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan;410023, China;[蔡光华; 刘松玉] 210096, China
通讯机构：
[Cai, G.-H.] S;School of Transportation, Southeast University, Nanjing, China
作者机构：
[Zeng, Ya-Wu; 叶阳; 金磊] School of Civil Engineering, Wuhan University, Wuhan, 430072, China;[李晶晶] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China;[金磊] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, China
通讯机构：
School of Civil Engineering, Wuhan University, Wuhan, China
作者机构：
[朱登峰; 李继祥; 杨建康] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, 430023, China;Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China;[陆海军] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, 430023, China, Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China
通讯机构：
[Lu, H.-J.] I;Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, China
作者机构：
[李继祥; 张雄; 张芊] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, 430023, China;Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China;[陆海军] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, 430023, China, Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China
通讯机构：
[Lu, H.-J.] I;Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, China
