Study on Deformation Characteristics and Support Technology of Surrounding Rock at Deep Roadway Intersection

Qi Fan

doi:10.54691/wfaq3h60

Authors

Qi Fan

DOI:

https://doi.org/10.54691/wfaq3h60

Keywords:

Intersection; Anchor cable reinforcement; Grouting reinforcement; Superimposed stress.

Abstract

Aiming at the serious surrounding rock deformation at the T-junction of S2303 auxiliary entry and south wing auxiliary transport main roadway in Gucheng Coal Mine, a combination of on-site observation, numerical simulation and on-site industrial test was adopted to comprehensively reveal the deformation and failure characteristics of the intersection and propose effective control technologies. The results show that the main reasons for the surrounding rock deformation at the intersection are the large burial depth of the roadway, the superimposed stress caused by the cross distribution of roadways, and the relatively weak surrounding rock. In response, a support scheme of roof anchor cable reinforcement combined with grouting reinforcement is proposed. The on-site industrial test shows that after adopting the roof anchor cable reinforcement combined with grouting reinforcement support scheme, the maximum displacement of the roof and floor of the roadway is 250mm, and the maximum displacement of the two sides is 200mm, ensuring the safe use of the roadway.

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