Energy-driven mechanism of failure and instability of anchored surrounding rock in deep gob-side entry

被引：0

作者：

Liu X. ^{[1
,3
,4
]}

Wang X. ^{[1
,2
]}

Tan Y. ^{[1
,3
]}

Li X. ^{[1
]}

Yang S. ^{[1
]}

Pei H. ^{[1
]}

机构：

[1] College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao

[2] Baodian Coal Mine, Yankuang Energy Group Co., Ltd., Jining

[3] State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao

[4] Ningxia Coal Industry Co., Ltd., China Energy Group, Yinchuan

来源：

Meitan Xuebao/Journal of the China Coal Society | 2024年 / 49卷 / 04期

关键词：

anchored surrounding rock; energy-driven mechanism; gob-side entry; lateral roof;

D O I：

10.13225/j.cnki.jccs.2023.1670

中图分类号：

学科分类号：

摘要：

Affected by the dynamic load induced by the fracture of lateral roof in the deep gob-side entry, the anchored surrounding rock is prone to produce large deformation, even failure and instability. Taking the tailgate of the 31120 working face in the Suncun Coal Mine as an engineering background, firstly, the development law of cracks in the anchored roof and the main failure mode of brittle tension crack were obtained by using the YTJ20 rock detection recorder. In addition, based on the similar material simulation test, the typical characteristics of three stages of lateral roof movement in the deep gob-side entry were obtained, and the fracture evolution and energy release law of anchored surrounding rock in different stages were analyzed. It is noted that the internal stress and deformation of anchored surrounding rock increase sharply, the cracks develop obviously and the energy is released significantly in the transitional movement stage, which has the greatest influence on the stability of anchored surrounding rock in the gob-side entry. Finally, the structural mechanical model of gob-side entry under lateral roof fracture movement was constructed, the quantitative calculation method of input and resistant energy of anchored surrounding rock were firstly provided, the energy-driven mechanism of failure and instability was revealed, and the instability energy criterion was defined, that is, when the energy applying on anchoring surrounding rock in gob-side entry is greater than the resistant energy of anchoring surrounding rock, the instability will occur. Accordingly, the instability risk classification method of anchoring surrounding rock and the corresponding strengthening control technology were put forward. The calculation results show that the instability risk level of anchored surrounding rock in the gob-side entry of the 31120 working face was medium risk. After strengthening the support, the deformation of roof and floor and the two sides of gob-side entry were reduced by 35.47% and 35.71%, respectively, the force of anchor cable was reduced by 23.43%, the deformation speed was obviously reduced, and the energy accumulation degree of anchoring surrounding rock was reduced. © 2024 China Coal Society. All rights reserved.

引用

页码：1819 / 1833

页数：14

共 32 条

[1] KANG Hongpu, ZHANG Xiao, WANG Dongpan, Et al., Strata control technology and applications of non-pillar coal mining[J], Journal of China Coal Society, 47, 1, (2022)
[2] WANG Qi, HE Manchao, YANG Jun, Et al., Study of a no-pillar mining technique with automatically formed gob-side entry retaining for longwall mining in coal mines[J], International Journal of Rock Mechanics and Mining Sciences, 110, pp. 1-8, (2018)
[3] LIU Xuesheng, SONG Shilin, TAN Yunliang, Et al., Similar simulation study on the deformation and failure of surrounding rock of a large section chamber group under dynamic loading[J], International Journal of Mining Science and Technology, 31, pp. 495-505, (2021)
[4] WANG Wenyong, GAO Mingzhong, WANG Man, Et al., Study on characteristics of deformation and stress distribution of gob-side entry retaining in the ultra-deep mine[J], Chinese Journal of Rock Mechanics and Engineering, 38, S1, (2019)
[5] WANG Pengfei, CHANG Tong, LU Junyu, Et al., Re-discussion on reasonable position and support technology of entry driven under the gob edge of previous split-level longwall panel[J], Journal of China Coal Society, 48, 2, (2023)
[6] LIU Xuesheng, FAN Deyuan, TAN Yunliang, Et al., Failure and instability mechanism of anchored surrounding rock for deep chamber group with super-large section under dynamic disturbances[J], Rock and Soil Mechanics, 42, 12, (2021)
[7] ZHANG Baisheng, WANG Pengfei, CUI Shouqing, Et al., Mechanism and surrounding rock control of roadway driving along gob in shallow-buried, large mining height and small coal pillars by roof cutting[J], Journal of China Coal Society, 46, 7, pp. 2254-2267, (2021)
[8] FAN Deyuan, LIU Xuesheng, TAN Yunliang, Et al., Instability energy mechanism of super-large section crossing chambers in deep coal mines[J], International Journal of Mining Science and Technology, 32, 5, (2022)
[9] WANG Pengfei, FENG Guorui, ZHAO Jingli, Et al., Investigation of stress of surrounding rock mass of gob-side entry under gob of a longwall panel, Rock and Soil Mechanics, 39, 9, (2018)
[10] HAO Xiaoqi, HAN Gang, XIE Jiahao, Et al., Rock burst mechanism of roadway excavation along goaf with small coal pillar in Ordos mining area[J], Journal of Mining and Strata Control Engineering, 5, 2, (2023)

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