摘要
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。
The subsidence void on the bedrock in ground movement basin may is cosidered as a result that mined area is spread up, and also considered as a essential condition of earth's surface swbsidence under thick alluvium. Because the alluvium character porous structure, less ability of resisting wind, poor capacity of resisting shear, and belonging to flabby stratum in comparison with bedrock, and because bedrock can control over all stratum deformation and damage process, we may consider bedrock as a controlling lay of surface subsidence. This paper establish themining subsidence pattern under thick alluvium by means of different thought and method, deduce calculating formulas, and lastly carry out check with the aid of worksite data.
