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| Study on anisotropic and roughness characteristics of shear fracture surface of black sandstone under tensile stress |
| CHEN Jun1，ZHOU Hui2，3，HOU Jing1，LU Jingjing2，3，ZHANG Chuanqing2，3，CUI Guojian2，3，NI Shaohu1 |
| (1. PowerChina Huadong Engineering Corporation Limited，Hangzhou，Zhejiang 310014，China；2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；3. University of Chinese Academy of Sciences，Beijing 100049，China) |
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Abstract Excavation and unloading from surrounding rock of underground caverns often cause failure modes such as tension and shear. In order to study the influence of different failure modes on the morphological characteristics of rock fracture surface，the direct tensile test and tension-shear test of black sandstone are carried out，and the two-dimensional and three-dimensional evaluation index are introduced to quantitatively characterize the rock fracture surface. The morphological characteristics of the rock fracture surface under the tensile stress are obtained，and the effects of different rupture mechanisms on the morphological characteristics of the fracture surface are briefly discussed. It is found that all kinds of roughness evaluation indexes decrease linearly with the increase in tensile stress. At the same time，based on the measurement of the anisotropic characteristic parameter ，the three-dimensional roughness evaluation index can accurately characterize the roughness of the rock fracture surface compared with the two-dimensional index ，and it has an exponential relationship to the tensile stress. For the direct tensile test，the difference in the morphology of the rock fracture surface is the smallest；for the tension-shear test，the degree of anisotropy of the fracture surface gradually increases to the decrease of the tensile stress. The results show that different rock failure modes and rupture mechanisms are the root causes of the differences in the morphology of the fracture surface.
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2020, Vol. 39 
