大断面灰岩巷道支护优化数值模拟研究

Numerical Simulation Study on Support Optimization of Large Section Limestone Roadway

在地质条件发生改变的情况下,针对店坪煤矿支护形式单一的现状,在详细调查生产地质条件的基础上,采用数值模拟的方式对店坪煤矿8#巷道进行优化。结果表明:在裸巷及现有支护条件下,巷道都能达到使用要求;在裸巷条件下巷道应力集中系数最大为2.6137,最大变形量为88.92mm;现有支护条件下巷道应力集中系数最大为2.5256,最大变形量为44.35mm;建议在8#煤层顶板相对完整区采用裸巷支护的方式,在局部破碎区采用加强支护的方式。

According to the present situation of single supporting form with the change of geological condition in Dianping Coalmine and based on the detail investigation of production and geological conditions,the supporting form in roadway of 8# coal seam was optimized with numerical simulation.The results showed that the roadway met the requirements of application under the conditions of bare roadway and the existing supports;the maximum roadway stress concentration factor was 2.6137 and the maximum deformation was 88.92 mm at the bare roadway;the maximum roadway stress concentration factor was 2.5256 and the maximum deformation was 44.35 mm at the existing support form.The suggestions are that the bare roadway can be adopted in the relatively complete area of the coal roof and the reinforced supports must be adopted at the local fragmented zones of coal roof in 8# coal seam.