本文认为岩溶矿区排水疏干时,地面产生沉陷的根本原因(内因)是被疏干岩体自身的结构所引起的。可溶岩体内的溶洞及溶蚀裂隙破坏了岩体的完整性,它们和松散充填物共同组成了被疏干岩体内的形态和规模不一、力学特性不同的各种地质界面,这些不同特性的地质界面的存在,导致在排水疏干,地下水位降低,地下水力条件发生变化 This paper argues that the root cause (internal factor) of subsidence in the surface of the karst mining area is caused by the structure of the dredged rock mass. Karst caves and dissolved fractures in the soluble rock body destroy the integrity of the rock mass. Together with the loose fillings, they form various geological interfaces of different sizes and mechanical characteristics in the dredging rock body. These various characteristics The existence of geological interface, leading to drainage in the dry, lower groundwater levels, underground water conditions change