同忻矿特厚煤层小煤柱 沿空掘巷分段支护设计研究

Sectional Support Design for Gob-side Entry Driving with Small Coal Pillars in Extra-thick Coal Seams in Tongxin Mine

为确定同忻矿特厚煤层大采高综放面沿空掘巷巷道合理支护方案,达到改善回采巷道压力显现和提高资源回收率的目的,采用理论计算、数值模拟、工程类比及现场监测等方法进行综合研究.通过理论计算确定煤柱采空区侧应力降低区宽度和沿空掘巷小煤柱宽度;通过数值模拟得出侏罗系遗留煤柱垂直应力对5205巷的影响,从而将5205巷煤柱上方分为采空区和煤柱影响区,在这两个区分别进行锚杆索及组合锚索的相关方案设计;通过现场实测来验证支护设计的合理性.为今后同忻矿乃至其它类似条件生产矿井的小煤柱合理支护提供有效参考.

In order to determine the reasonable support scheme for the gob-side entry driving in the fully mechanized working face with large mining height in the extra-thick coal seams in Tongxin Mine,comprehensive research was conducted,including theoretical calculation,numerical simulation,engineering analogy,and field monitoring,to improve strata behavior and to increase resource recovery rate in the mining roadways.The theoretical calculation was used to determine the width of the lateral stress reduction zone in the goaf with coal pillars and the width of small coal pillars along the goaf.The numerical simulation was used to determine the influence of the vertical stress of Jurassic coal pillars on lane 5205.Therefore,the upper part of the coal pillars of lane 5205 was divided into a goaf area and a coal pillar affecting area,and the relevant scheme design for the anchor cable and the combined anchor cable were performed in these two areas,respectively.The field measurement was used to verify the rationality of the support design.It will provide an effective reference for the reasonable support design in Tongxin Mine and other similar mines in the future.