Study on creep instability mechanism and key control technology of surrounding rock in deep soft rock roadway

REN Shuai; LU Dechao; LUO Yong; XIAO Diancai; KANG Zhipeng; TONG Zheng

doi:10.13347/j.cnki.mkaq.20222289

Safety in Coal Mines > 2024 > 55(3): 190-198. > DOI: 10.13347/j.cnki.mkaq.20222289

REN Shuai, LU Dechao, LUO Yong, et al. Study on creep instability mechanism and key control technology of surrounding rock in deep soft rock roadway[J]. Safety in Coal Mines, 2024, 55（3）: 190−198. DOI: 10.13347/j.cnki.mkaq.20222289

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Study on creep instability mechanism and key control technology of surrounding rock in deep soft rock roadway

REN Shuai^{1, 2,},
LU Dechao^{1, 2},
LUO Yong^{1, 2},
XIAO Diancai^{1, 2},
KANG Zhipeng^{1, 2},
TONG Zheng^{1, 2}

1.
State Key Laboratory of Deep Coal Mining & Environment Protection, Huainan Mining Group Co., Ltd., Huainan 232000, China
2.
Huaihe Energy Holding Group Co., Ltd., National Mine Safety Administration Key Laboratory of Coupled Hazards Prevention and Control in Deep Coal Mining, Huainan 232000, China

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Received Date: December 21, 2022
Revised Date: February 01, 2023

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Abstract

Abstract

Controlling the creep instability of the surrounding rock of the deep soft rock roadway is a necessary prerequisite to achieve safe mining operations. This paper takes Guqiao Coal Mine as the engineering background, uses experimental testing, theoretical analysis, industrial experiments, on-site monitoring and other methods to conduct in-depth research. The study results show that the strength of the surrounding rock of the deep roadway in Guqiao Coal Mine is weak, and it is easy to cause a significant decline in long-term strength, elastic modulus, cohesion and internal friction angle after immersion, rock softening, continuous expansion of floor loose zone and reduction of overall stability of surrounding rock; the special shape of internal and external bearing structure of surrounding rock is defined: approximate vertical ellipse, based on improving the stability of the bearing structure, the deep hole grouting technology of the bottom plate is proposed. The deep hole grouting of the bottom plate can quickly change the shape of the bearing structure and change the unstable approximate vertical ellipse shape into the approximate circular shape with high stability.
- surrounding rock control,
- soft rock,
- creep instability mechanism,
- deep roadway,
- grouting reinforcement,
- deep hole grouting of floor

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