开采缓倾斜煤层倾向主断面地表残余移动变形函数

Surface Residual Movement and Deformation Function of Main Section in Gentle Inclined Seam Mining

基于老采区地表残余移动变形机制,指出第2阶段地表残余变形对地基稳定性的影响是不可忽略的;基于单元开采引起地表单元下沉数学模型,分别提出缓倾斜煤层在半无限和有限开采条件下地表残余移动变形预测的5个数学模型:倾向主断面地表残余下沉函数、倾向主断面地表残余水平移动函数、倾向主断面地表残余曲率变形函数、倾向主断面地表残余水平变形函数、倾向主断面地表残余倾斜变形函数.采用FLAC3D数值模拟、数学模型对比和矿区实测数据3种方式对该数学模型进行了验证.结果表明,提出的数学模型达到定量分析精度,可推广性强,可以用来预测开采缓倾斜煤层倾向主断面地表残余移动变形.

Based on the residual movement and deformation mechanism in the old mining area,it is pointed out that the influence of residual deformation on the stability of foundation during the second stage can not be neglected.Based on the mathematical model of surface subsidence induced by unit mining,five mathematical models for predicting the residual ground deformation of gently inclined coal seam under semi-infinite and limited mining conditions are proposed respectively:incline main section surface residual subsidence,incline main section of surface function the residual level of mobile function,incline main section of residual surface curvature deformation function,incline main section of residual surface horizontal deformation function,incline main section of residual surface tilt deformation function.The mathematical model was verified by FLAC3 Dnumerical simulation,comparison of mathematical model and measured data of mining area.The results show that the proposed mathematical model achieves the quantitative analysis accuracy and can be generalized.It can be used to predict the surface residual movement deformation in the main section of inclined gently inclined coal seam mining.