Temporal-spatial evolutionary law of plastic zone and stability control in repetitive mining roadway

被引：0

作者：

Wu X. ^{[1
,2
]}

Liu H. ^{[2
]}

Li J. ^{[1
]}

Guo X. ^{[2
]}

Lü K. ^{[3
]}

Wang J. ^{[1
]}

机构：

[1] Institute of Mining Engineering, Inner Mongolia University of Science and Technology, Baotou

[2] School of Energy and Mining Engineering, China University of Mining & Technology (Beijing), Beijing

[3] Mine Safety Technology Branch, China Coal Research Institute, Beijing

来源：

Meitan Xuebao/Journal of the China Coal Society | 2020年 / 45卷 / 10期

关键词：

Deviatoric stress; Mining impact; Plastic zone; Retained roadway; Surrounding rock control;

D O I：

10.13225/j.cnki.jccs.2019.1051

中图分类号：

学科分类号：

摘要：

In view of the serious deformation and destruction of surrounding rock, the difficulty of support and the hidden roof fall hazard affected by repetitive mining in the retained roadway, the temporal-spatial evolution laws of stress and surrounding rock plastic zone were studied in the 22205 air return roadway in Buertai Colliery by the comprehensive analysis methods including theoretical analysis, numerical simulation and field test. The whole dynamic failure process of roadway surrounding rock from excavation stability to abandonment and the static spatial expression of surrounding rock failure state at different positions are obtained. The dynamic-static combination mechanism of plastic zone variation in repeated mining roadway is expounded. The results show that ① there is a corresponding relationship between the time and the spatial zone of the plastic zone expansion in the mining process and the specific range of the spatial zone is obtained according to the field measurement, which are important foundations in analyzing the mechanism of roadway deformation and putting forward the support plan in different stages. ② The asymmetric expansion mechanism of the plastic zone is obtained. Its range is determined by the magnitude of deviatoric stress, and its orientation is dominated by the direction of principal stress. The combined action of the magnitude of deviatoric stress and angle causes the asymmetric expansion of plastic zone, and then generates asymmetric deformation, so the mechanical mechanism of temporal-spatial expansion in the plastic zone of repetitive mining roadway is revealed. ③ According to the expansion form of plastic zone, the depth and range of plastic zone expand significantly in the primary mining process, and the roof and floor are obviously larger than the two sides. In the process of secondary mining, the plastic zone depth changes little but the range increases obviously, which mainly occurs at the top angle of coal wall and the bottom angle of coal pillar. ④ Based on the temporal-spatial relationship of plastic zone expansion during repeated mining, a method of fractional reinforcement support is proposed to solve the stability control of surrounding rock in repeated mining roadway. According to the expansion form of plastic zone and field test, it should clearly determine the reinforcing time, position and parameters, and provide a reinforcing roof bolting to save work time and guarantee the mining safety in production. © 2020, Editorial Office of Journal of China Coal Society. All right reserved.

引用

页码：3389 / 3400

页数：11

共 17 条

[1] (1999)
[2] (2003)
[3] KANG Hongpu, YAN Lixin, GUO Xiangping, Et al., Characteristics of surrounding rock deformation and reinforcement technology of retained entry in working face with multi-entry layout, Chinese Journal of Rock Mechanics and Engineering, 31, 10, pp. 2022-2036, (2012)
[4] WANG Shuwen, MAO Debing, PAN Junfeng, Et al., Measurement on the whole process of abutment pressure evolutionand microseismic activities at the lateral strata of goaf, Journal of China Coal Society, 40, 12, pp. 2772-2779, (2015)
[5] ZHANG Ming, JIANG Fuxing, WANG Jianchao, Et al., Space-time regularity of roadway deformation under disturbance of several coal seams in ultra-deep mines, Journal of Mining & Safety Engineering, 35, 2, pp. 229-237, (2018)
[6] LI Jiazhuo, ZHANG Jibing, HOU Junling, Et al., Multiple disturbance instability mechanism of dynamic pressure roadway and mining sequence optimization, Journal of Mining & Safety Engineering, 32, 5, pp. 439-445, (2015)
[7] MA Nianjie, LI Ji, ZHAO Zhiqiang, Et al., Distribution of the deviatoric stress field and plastic zone in circular roadway surrounding rock, Journal of China University of Mining & Technology, 44, 2, pp. 206-213, (2015)
[8] ZHAO Zhiqiang, Mechanism of surrounding rock deformation and failure and control method research in large deformation mining roadway, (2014)
[9] GUO Xiaofei, MA Nianjie, ZHAO Xidong, Et al., The general shapes and criterion for surrounding rock mass plastic zone of round roadway, Journal of China Coal Society, 41, 8, pp. 1871-1877, (2016)
[10] WANG Weijun, YUAN Chao, YU Weijian, Et al., Stability control method of surrounding rock in deep roadway with large deformation, Journal of China Coal Society, 41, 12, pp. 2921-2931, (2016)

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