Title: stress and deformation evolution law of surrounding rock in secondary reuse of roof cutting and roadway forming in three soft coal seams
Author: Zhang Yong 1,2, Shen Fuxin 1,2, sun Xiaoming 1,2, he ManChao 1, Wang Jiong 1,2, Du min 1,2
Author:
1. State Key Laboratory of deep geotechnical mechanics and underground engineering, China University of mining and technology, Beijing 100083;
2. School of mechanics and construction engineering, China University of mining and technology, Beijing 100083
Abstract:
In order to study the stability of surrounding rock during the secondary reuse of self formed roadway under the condition of "Three Soft" coal seam, taking the 1200 experimental working face of Zhongxing Coal Mine as the engineering background, this paper analyzes the disturbance factors of self formed roadway during the period of "mining - retaining - using", through numerical simulation and field test, The results show that under the condition of "Three Soft" coal seam, the influence range of the advance supporting stress of the self-formed roadway is about 40 m, and the peak value of the stress is about 10 m away from the working face; the roof and floor of the roadway are in a low stress level, and the maximum value of the lateral stress of the stope is far away from the solid coal seam, The goaf on the side of gangue is always at a low stress level. This technology effectively cuts off part of the stress transfer path of the roof and improves the stability of the self formed roadway during the secondary reuse period. The deformation of surrounding rock can be roughly divided into slow deformation area, accelerated deformation area and severe deformation area along with the strike of the working face. Key words: "Three Soft" coal layers; roof cutting and pressure relief; self formed roadway; lateral stress; Stability: Zhang Yong, Shen Fuxin, sun Xiaoming, et al. Evolution rule of stress and deformation of surrounding rock in secondary reuse of roof cutting and roadway forming in three soft coal seams [J]. Journal of China University of mining and technology, 2020,49 (2): 247-254
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