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露天矿山边坡岩土体疏水所引起的地表沉降及变形，往往大于开挖本身引起的沉降及变形．应用随机介质理论，假设岩土移动过程符合Ｍａｒｋｏｖ过程，再利用叠加原理，导出了露天开挖及岩土疏水导致的地表沉降及变形计算方法．计算获得的疏水导致的地表移动大小及范围均大于开挖引起的地表移动大小及范围．分析计算结果与Ｍｏｒｗｅｌ露天褐煤矿的监测资料的对比令人满意．
Surface subsidence and deformation caused by the drainage of rock and soil in open pit mine slopes are often larger than the settlement and deformation caused by excavation itself. Using stochastic medium theory, it is assumed that the process of rock and soil movement accords with Markov process, and then the superposition principle is used to derive the method of surface settlement and deformation calculation caused by open-cut excavation and soil hydrophobic. The size and the extent of surface movement caused by the calculated hydrophobicity are all larger than the size and scope of the surface movement caused by excavation. The results of the analysis and the comparison with the monitoring data of Morwel open-air brown coal mine are satisfactory.