采动影响下特厚煤层巷道围岩支护技术
Surrounding rock support technology of extra thick coal seam roadway under the influence of mining
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摘要: 针对酸刺沟煤矿特厚煤层巷道受2次采动影响后围岩支护困难的问题,采用理论分析、数值模拟与工程实践相结合的方法,分析了采动影响下特厚煤层巷道围岩破坏规律,提出了采动影响下特厚煤层巷道围岩分次支护技术,并进行了工程实践。结果表明:一次采动影响下,巷道围岩塑性区呈“增大-平稳”趋势,主要表现为滞后影响,工作面后方300 m外,塑性区保持不变,二次采动影响下,巷道围岩塑性区呈“减小-平稳”趋势,工作面30 m范围内影响较大,随后逐渐趋于稳定,试验巷道围岩能够保持稳定。Abstract: In view of the difficulty of surrounding rock support in the extra thick coal seam roadway affected by twice mining in Suancigou Coal Mine, the deformation and failure law of surrounding rock in the extra thick coal seam roadway under the influence of mining was analyzed by means of theoretical analysis, numerical simulation and engineering practice. The staged supporting technology for the roadway surrounding rock of extra-thick coal seam under the influence of mining was proposed, and the engineering practice was carried out. The results show that under the influence of primary mining, the plastic zone of surrounding rock of roadway presents a trend of “enlargement and stabilization”, which is mainly manifested as lag effect. Outside 300 m behind the working face, the plastic zone remains unchanged. Under the influence of secondary mining, the plastic zone of surrounding rock of roadway presents a trend of “reduction-stabilization”, and the effect is larger within 30 m of the working face, and then gradually tends to be stable. And the surrounding rock of the test roadway can maintain stability.
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Keywords:
- extremely thick coal seam /
- mining influence /
- plastic zone /
- failure mechanism /
- roadway support
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