高速公路下伏多层采空区地表沉陷的预计评价方法

Ground subsidence predictions for highway underlaying multiplayer goaf

介绍多层采空区地表沉陷预计的概率积分法 ,采用闭合矩形分块段积分模型 ,可以适应采深、采厚、煤层倾角和开采形状的变化以及复杂多个走向采空区的情况 ,提高程序的通用性和预计评价精度 .通过计算单元的坐标变换可以方便地预计倾斜煤层对地表沉降的影响 ,改变传统的上山下山方法 .实例计算结果表明 ,水平变形、地表斜率和曲率沿公路轴向和横向变化均较大 ,远远超过允许值 。

The probability integration method for calculating ground subsidence of multiplayer goaf is introduced. Using the integral model of close rectangular and blocking partition,the method can be adapted to the chance of mining depth, mining thickness, coal bed pitch and sharp,as well as complex several strike goaf, and therefore the program versatility and the prediction precision can be improved. Ground subsidence of inclined coal bed can easily be predicted by coordinates conversion and conventional raise and diphead method are modified.