采场底板岩层应力的解析法计算及应用

在分析矿山压力的基础上，建立了煤层底板应力分析计算模型，运用弹性理论对煤层底板随工作面推进相对固定位置剖面处应力分布规律进行了求解.结合实际资料，随着工作面推进，煤层某相对固定位置底板应力沿深度变化幅度越来越小，在一定深度范围内垂直应力的释放速度远大于水平应力的释放速度，故最大主应力的方向由开始的垂直方向变为后来的水平方向.这可为带压开采下煤层底板突水和工作面底鼓防治提供理论依据.

Application of Analytic Method in Calculating Floor Stress of a Working Face

The mine ground pressure is analyzed and the mathematics model for calculating the floor stress of a working face constructed.The distributing principle of stress of the relatively fixed position on the floor is deduced based on the theory of elasticity.The analysis of site data shows that,with the advancing of working face,1) the variation of floor stress of a coal seam at a certain position becomes smaller and smaller with the increase of depth, and 2) the releasing rate of vertical stress is much greater than that of the horizontal stress within a certain depth range.So the direction of the maximum principal stress changes from vertical to horizontal.This has provided a theoretical basis for preventing water inrush above a confined aquifer and mining face heave from taking place.