The article summarized the basic conditions of ningdong coal mining areas , calculated the numerical imitation of ground subsidence , gave the calculation formulas of the deformation volume , summarized the subsidence laws of the coal mining areas , and simply analyzed the causes and features of the ground subsidence 摘要在概述宁东采煤区基本情况的基础上，对其地表沉陷进行了数值模拟分析计算，给出了采区沉陷各变形量的计算公式，总结了其沉陷规律，简析了地表沉陷的成因与特点，为综合治理提供依据。
As soon as the tunnel boring machine advances 1m forward , 6 pieces of pre - cast concrete segment are fabricated and forming a ring with internal diameter of 5 . 6m to support soil outside , while simultaneous back - filling and 32 - hole chemical grouting injector equipment installed with tunnel boring machine consolidating soil instantaneously to enhance the soil strength . the tunnel boring machine is also equipped with guided top gyroscope and true circularity retaining device for construction accuracy 其中值得一提者，板桥土城线所采用之潜盾机系新型之土压平衡式机种，具同步背填灌浆之功能，对地表沉陷之控制成效优良，目前已贯通并通过民房及商业区下方之下行隧道其初期沉陷均控制在5mm之内，二次沉陷及最终沉陷平均总量最大亦仅18mm ，远优于初始设计的警戒值30mm 。
In order to accurately calculate the mining induced subsidence in thick alluvium areas so as to decrease the mining damage and environment disruption , the calculation of surface subsidence caused by water loss of clay was discussed based on probability integral method and used in a real case 摘要为了更加精确地计算厚冲积层矿区的煤矿开采沉陷问题，减小采动损害与环境破坏，基于煤矿开采沉陷计算的概率积分法，探讨了由于黏土体失水引起的地表沉陷计算问题，推导了黏土体失水引起的地表下沉计算公式，并应用于煤矿实际地表沉陷，加以分析论证。
Many domestic and overseas cases of surface subsidence and damage induced by underground water mining are enumerated in this paper and the surface subsidence mechanism induced by underground water mining is analyzed from the location of water - bearing stratum , physical characteristics of carrier , drifting manners and subsidence styles 摘要列举了国内地下水开采造成地表沉陷和损害的许多实例，并从地下水所处的地层层位、载体物性、载体厚度、抽排方式和沉陷类型入手，分析了地下水开采地表沉陷发生机理。
