大磨岭煤矿滑动破碎围岩巷道非对称变形特征及控制对策研究

doi:10.11799/ce201404024

Abstract

Abstract:

According to the support status and sliding structure with special geological conditions of -426m level west ventilation roadway of Shenhuo Group DaMoling coal mine, the paper analyses and summarizes the asymmetric deformation mechanism and influence factors through using roadway deformation observation and borehole camera shooting method. The results show that the development of surrounding rock loose circle of roadway is increased along with the exposure time whose increases; the development of surrounding rock loose circle within the section of roadway affected is asymmetrical distribution with the influence of stratification sliding, which is showed that loose circle is larger to vertical stratification, loose circle is lesser to parallel stratification direction. The interlaminar shear-slip deformation is key factors which affecting the stability of roadway; The overall destructive characteristics of roadway show that “Asymmetrical bottom drum- Overall sink under side of roadway-the discrepancy deformation of shoulder- Overall asymmetric deformation of roadway”. On the base of the research result, the paper put forward the “long bolt and cable combined asymmetric supporting technology” ,which using 3m long bolt control the strength of surrounding rock, adjust distance between bolt, cable and high strength foot bolts to reinforce support on interlayer slip deformation and other key parts. Engineering applications demonstrate that the asymmetric coupling support is effective in controlling asymmetric deformation of sliding cracking surrounding rock, and improve overall support performance of roadway.

Key words: sliding cracking surrounding rock, sliding cracking surrounding rock, asymmetric coupling support, Slip deformation

CLC Number:

TD332

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Study on asymmetric deformation mechanism and controlling countermeasures of roadway sliding cracking surrounding rock in DaMoling coal mine

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