1. Coal Mining Branch,China Coal Research Institute,Beijing　 100013,China; 2. Coal Mining and Designing Department,Tiandi Science and Technology Co. ,Ltd. ,Beijing　 100013,China

In order to study the shear strength and related parameters of coal structural planes from Jincheng an-thra- cite coal,some direct shear tests under different normal stresses were carried out on coal samples with structural planes from No,3 coal seam of Sihe mine,and also the three dimensional photogrammetry of the structural surface topography was carried out. The tests obtained some experimental values and estimated values. The test results show that under a low normal stress level,the stiffness range of coal structural plane is 13-39． 2 GPa / cm,and the range of shear stiffness is 3． 1-26． 6 GPa / cm. Under a moderate normal stress level,the stiffness range of coal structural plane is 13. 8-62． 0 GPa / cm,and the range of shear stiffness is 4． 3-18． 2 GPa / cm,The average cohesion of coal structural plane is 0． 67 MPa,and the average peak friction angle is 37 degree. With the increase of normal stress,the normal stiffness, shear stiffness and shear strength of the structural plane also increase. The test values provide a reference for the pa- rameters in numerical simulation. Through the comparison between calculated shear strength and experimental shear strength,the JRC-JCS model can be used to predict the shear strength of the structural plane.

国家重点研发计划资助项目(2017YFC0603003)；国家自然科学基金青年基金资助项目(51704156)；中国煤炭科工集团有限公司科技创新创业资金专项资助项目(2018QN017)；

ZHAO Ke,KANG Hongpu,WANG Xiaoqing,et al. Test and estimation on the shear parameters of structural plane from Jincheng anthracite coal[J]. Journal of China Coal Society,2018,43 (9):2432 - 2437.