急倾斜煤层充填开采区段平巷围岩稳定性模拟研究

Research on surrounding rock stability of roadway for goaf backfilling in steeply inclined seam by numerical calculation

基于龙湖煤矿的水文地质和开采技术条件,采用离散元数值计算软件Udec2D,分析了急倾斜煤层仰斜开采在采空区不充填、部分充填和整体充填不同顶板控制方式下,以及不同充填体强度对区段运输平巷围岩稳定性的影响,研究表明:采空区不进行充填,区段平巷变形最大;部分充填和整体充填均随着充填体强度的增加,区段平巷变形呈降低趋势,且整体充填顶板控制效果显著高于部分充填。同时,整体充填效果优于部分充填。现场实测和数值模拟结果基本相符。

In order to ensure safe mining of steeply inclined seam,the roof control way of gangue self-rolling backfilling in the goaf of steeply inclined seam was used.Based on the occurrence conditions of steeply inclined coal seam and hydrological engineering geological conditions of Long Hu coal mine,Udec2D numerical calculation is used in this paper to analyze the roadway surrounding deformation effect with different goaf control may of unfilling,partial filling and whole filling as well as the gangue backfilling body strength in steeply inclined seam.The results show that when the gob is not filled,there will be the biggest deformation of surrounding rock.With the increment of backfill strength,the deformation of roof and floor tends to decline in both partial filling and whole filling,and the roof control effect with whole filling is significantly better than with partial filling.The actual measurement on the spot is same as numerical calculation results.