厚煤层小煤柱护巷及支护技术研究

发布时间：2018-08-05 19:20

【摘要】：为解决长平煤矿厚煤层护巷煤柱留设宽度大,留巷变形严重的难题,利用理论分析、数值模拟、工程类比方法研究了长平煤矿小煤柱护巷可行性及围岩控制方案,提出了6 m宽小煤柱护巷以及"围岩整体封闭强化控制"支护理念,并在长平煤矿4309工作面进行现场试验。结果表明:应用浅掘深、及时锚网索喷联合支护、底板锚固浇筑强化、二次及时喷浆以及锚杆(索)封孔防围岩风化措施的整套支护方案可有效保证围岩的整体结构;对6 m宽小煤柱两侧巷帮进行锚索加固,超前工作面20~40 m与滞后工作面50~100 m两次煤柱注浆,可有效加固小煤柱,提高其承载能力;采用一梁三柱对巷道及留巷进行超前40 m架棚支护,对工作面后100~150 m范围留巷进行架棚支护,可进一步降低动压影响下的巷道变形量。
[Abstract]:In order to solve the problem of large width of retaining pillar and serious deformation of retaining roadway in thick coal seam of Changping coal mine, the feasibility of protecting roadway with small pillar in Changping coal mine and the control scheme of surrounding rock are studied by using theoretical analysis, numerical simulation and engineering analogy method. This paper puts forward the idea of protecting roadway with 6 m wide and small coal pillar and supporting idea of "whole surrounding rock closed and strengthened control", and carries out field test in 4309 face of Changping Coal Mine. The results show that the whole support scheme of shallow excavation, timely bolting, wire mesh and shotcrete combined support, bolting and pouring strengthening of bottom plate, second time grouting and anti-weathering measures of bolt (cable) sealing hole can effectively guarantee the overall structure of surrounding rock. Anchorage cable reinforcement is carried out on both sides of 6 m wide and small coal pillar. The grouting of 2040 m ahead face and 50 100 m lag coal face can effectively strengthen the small coal pillar and improve its bearing capacity. Adopting one beam and three columns to support the roadway and the remaining roadway in advance of 40m frame shed, and supporting the roadway of 100m 150 m behind the working face, can further reduce the amount of roadway deformation under the influence of dynamic pressure.
【作者单位】：山西长平煤业有限责任公司;
【基金】：山西省科技重大专项资助项目(20121101002)
【分类号】：TD353

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