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《Chinese Journal of Underground Space and Engineering》 2013-05
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Analytical Solution of Stress in a Transversely Isotropic Floor Rock Mass under Mining

Lu Haifeng;Yao Duoxi;Liang Xiuyu;Guo Liquan;Shen Dan;College of Earth and Environment,Anhui University of Science and Technology;Water Science Research Center,Nanjing University;  
Aiming at the problem in stress calculation of mining seam floor where the layered rock mass is regarded as isotropic medium,the transverse isotropic elastic theory is introduced to the analytic solution of stress in mining coal seam floor.According to the load distribution on overburden of coal seam,using the stress component formula from semi-infinite transversely isotropic body surface under concentrated force,an analytical solution of stress in a transversely isotropic floor rock mass is derived under the condition of mining,and it is verified by comparing the numerical solutions with those by FLAC3D.On this basis,the change rule of additional stress of the transversely isotropic floor and the isotropic floor is analyzed in the horizontal direction.The results show that: at the same depth of coal seam floor,the degree of unloading of vertical additional stress of the transversely isotropic floor in the goaf is less than that of the isotropic floor.But the horizontal additional stress has the opposite change rule.At the two sides of the working face,the vertical additional stress and horizontal additional stress concentration degree of transversely isotropic floor is smaller than that of the isotropic floor.Additional shear stress in the transversely isotropic floor is less than the isotropic floor.When the floor is a transversely isotropic rock mass,it is not reasonable to calculate the stress distribution by the isotropic rock mass,corrections are necessary.
【Fund】: 国家自然科学基金面上项目(51174256);; 2012年安徽理工大学硕博基金资助项目(201211160);; 2012年国家大学生创新创业训练计划项目
【CateGory Index】: TD311
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