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| An experimental study on the cumulative damage and shear properties of rock joints under pre-peak cyclic shear loading |
| LIU Xinrong1，2，DENG Zhiyun1，2，LIU Yongquan1，2，3，LIU Shulin1，2，LU Yuming4，HAN Yafeng1，2 |
| (1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area Chongqing University，Chongqing University，Chongqing 400045，China；3. China Construction Underground Space Co.，Ltd.，Chengdu，Sichuan 610081，China；4. Chongqing No.7 Construction Engineering Co.，Ltd.，Chongqing 400059，China) |
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Abstract To investigate the cumulative damage characteristics of rock joints under different failure modes，the original rock samples with second-order asperities were obtained by adopting water knife cutting processing method，and the direct shear test was carried out under pre-peak cyclic loading conditions. The influence of the cyclic loading times，the loading rate and the loading amplitude on shear properties of rock joints were analyzed. Results show that the cumulative damage of a rock joint with climbing failure mode is characterized by the abrasion of second-order asperities，that the cumulative damage of a rock joint with cutting failure mode is characterized by the crack initiation and crack coalescence of the first-order asperity，and that，under the climbing-cutting failure mode，the cumulative damage of a rock joint has the damage features of the climbing failure and the cutting failure modes. With increasing loading cycles，the peak shear strength of the rock joint presents a trend of increasing at first and decreasing subsequently while the residual shear strength of the rock joint almost keeps stable. When the loading rate or the loading amplitude increases，the deterioration speed of the peak shear strength of the rock joint increases and hence，the peak shear strength of the rock joint decreases. The effect of pre-peak cyclic loading on the rock joint can be attributed to contact effect and damage effect，and the evolution of the two effects is the root cause for the peak shear strength of the rock joint increasing at first and decreasing subsequently during direct shear test under pre-peak cyclic loading.
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2018, Vol. 37 
