Authors: Fengda Zhang
Addresses: Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing 10013, China
Abstract: The horizontal tectonic stress is one of the important reasons for water inrush, which is mostly caused by the geological structure. The stress distribution around the stope is analysed by revised mechanical model. The distinctions in the maximum principal stress between revised formula and the original formula are analysed. Numerical models are established with different horizontal tectonic stress intensity in far field. When the horizontal tectonic stress is smaller than the vertical stress in far field, comparing to original maximum principal stress, the maximum principle stress of roof and floor in front of stope is larger, and the maximum principle stress of the roof and floor in the gob is smaller. This leads to the increase of shear stress near the stope, and the shear plastic damage of rock mass is more prone to occur. The result of theoretical model is validated by numerical simulation.
Keywords: Westergaard stress function; fracture mechanics; horizontal tectonic stress; mining engineering; numerical simulation.
International Journal of Mining and Mineral Engineering, 2020 Vol.11 No.3, pp.191 - 202
Accepted: 23 Mar 2020
Published online: 07 Sep 2020 *