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在厚冲积层条件下，采动沉陷盆地中基岩上表面形成的下沉空间可以认为是采空区向上传播的结果，也是地表得以下沉的必要条件。由于冲积层结构松散，抗弯能力低。抗剪强度也小，与基岩相比，属于软弱层，而基岩对整个上覆岩层的移动变形及破坏过程起着控制作用，因此，基岩可认为是地表沉陷的控制层。本文采用不同的思路和方法来建立厚冲积层条件下的采动沉陷模型，并推导出了计算公式最后用实例进行了验证。
Under the conditions of thick alluvium, the subsidence space formed on the upper surface of bedrock in the mining subsidence basin can be considered as the result of the upward propagation of the goaf and the necessary condition for the surface to sink. As alluvial structure loose, low bending strength. Shear strength is also small, compared with the bedrock, belongs to the weak layer, and bedrock control over the entire deformation and failure process of the overburden, so bedrock can be considered as the control layer of the surface subsidence. In this paper, different train of thought and method are used to establish the mining subsidence model under thick alluvium, and the calculation formula is deduced finally by examples.