Shapes and formation mechanism of the plastic zone surrounding circular roadway under partial confining stress in deep mining

Xiaofei Guo , Chen Li , Tianhong Huo

Abstract

To reveal the failure mechanism of roadway surrounding rock under the partial confining stress in deep mining, by means of theoretical analysis and numerical simulation, this paper studied the distribution laws of the principal stress field around the circular hole and compared the shapes of the plastic zone surrounding rock under the same conditions. The results show that: under hydrostatic stress (λ=1), the circumferential principal stress around the hole is the same everywhere, and the shape of plastic zone is circular; under low partial confining stress (1

Key Words

partial confining stress; plastic zone shape; lateral stress coefficient; circular roadway; deep mining

Address

Xiaofei Guo, Chen Li and Tianhong Huo: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

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