考虑底板岩层移动的急倾斜煤层开采沉陷预计

分析了急倾斜煤层开采岩层和地表移动特点,总结了急倾斜煤层开采地表下沉盆地的4种类型,并对这4种下沉盆地的形成原因进行揭示。给出了急倾斜煤层开采沉陷预计建模的4条原则,并针对该原则提出了一种基于概率积分法的急倾斜煤层开采沉陷预计模型,该模型能清楚地解释急倾斜煤层开采煤层顶底板岩层移动和地表下沉的相互关系。建立了预计方法的坐标系,分析了预计参数的物理意义,并给出了预计参数的变化规律。编制了基于本文方法的计算机程序,并利用矿区观测站实测数据对本方法进行了验证。实验结果表明,本文方法对于倾角大于70°的急倾斜煤层开采沉陷预计效果较好,能为矿区的环境保护,地表移动预警起到决策支持作用。

Steep Coal Seam Mining Subsidence Predictionon Considering Floor Strata Movement

The characteristics of strata and ground movements on condition of steep coal seam mining are analyzed. Four types of surface subsidence trough caused by steep coal seam mining are summarized, and the formation of four kinds of subsidence trough are revealed. The four principles for building the steep seam mining subsidence prediction model are given. A kind of surface subsidence prediction model, which is based on Probability Integral Method and compliances with the four principles, is put forward. The prediction model can explain the relationship between the roof and floor strata movement and surface subsidence clearly. The coordinate system for subsidence prediction is established. Each parameter of the prediction model has been explicated for its physical meaning, and the alteration rule of the parameters are acquired. A program based on the prediction model is implemented and the method is verified by filed data at last. Experimental results show that mining subsidence prediction effect is good,on condition of inclined angle, which is larger than 70 °.The study can be used for the mining area environmental protection, the surface movement early warning and decision support.