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| Study on shear mechanical properties and deformation characteristics of shear zone of soil-rock mixture-bedrock interface
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| YANG Zhongping1，2，3，LIU Haoyu1，2，3，LI Jin1，2，3，LI Xuyong1，2，3，LIU Xinrong1，2，3
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| (1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；3. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas(Chongqing)，Chongqing 400045，China)
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Abstract The interface shear mechanical properties of soil-rock mixture and bedrock are complex，and the meso-morphology of the interface has an important influence on the shear mechanical properties and the deformation characteristics of the shear zone. Based on simple shear test and numerical simulation，the shear mechanical properties，shear zone characteristics and evolution law of the interface between soil-rock mixture and bedrock with different mesoscopic morphology were researched. The results show that the Roughness is the main controlling factor of cohesion. When roughness increases from 8.9 to 11.5，cohesion increases by 95.3%. Roughness has little effect on the interface friction angle，which fluctuates at 27°. The anchor effect can occur in the micro-groove structure at a certain inclination angle，and the soil and stone in the groove form anchor solid，which can increase the shear strength of the interface and control the development of shear band along its outer contour，namely so-called surrounding stone phenomenon. The block rock at the gentle interface has hysteresis effect，and is easy to form false anchor solid with the surrounding soil and stone，which is much less strong than the anchor solid，and controls the bifurcation development of the shear zone around its outer contour and the bedrock interface，resulting in the phenomenon that shear encloses the stone in the shear zone. Based on energy changes，the shear process can be divided into three stages: at the beginning of shear，the strain energy and friction energy increase rapidly，which is the shear densification stage. The proportion of strain energy and friction energy growth rate is approximately 9:1，which is a linear increase stage. At the end of shearing，the strain energy ratio continues to decrease，but still occupies a dominant position，which is the strain hardening stage.
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2023, Vol. 42 
