广东凡口铅锌矿地面塌陷成因及分布规律

Surface Subsidence Genesis and Distribution Regularity of Fankou Pb-Zn Mine in Guangdong Province

以岩溶塌陷的产生机理为理论基础,从水文地质、工程地质角度出发,分别从地下水位变化、岩溶发育程度、地层结构、降雨等多方面分析了凡口铅锌矿在生产建设中地面塌陷成因及分布规律。研究表明:该塌陷区灰岩裂隙发育和第四系松散覆盖层的砂、砾石黏土互层结构为区内塌陷形成的基本地质条件,地下水活动是地表塌陷的主要诱发因素。在上述分析的基础上,对矿区主要建(构)筑物的布置方式进行了讨论,供类似矿山参考。

Based on the occurrence mechanism of karst subsidence,the surface subsidence genesis and its distribution regularity during the construction process of Fankou Pb-Zn Mine are discussed from the aspects of the changes of underground water level,karst development degree,stratigraphic structure and rainfall based on the study direction of hydrogeology and engineering geology. The study results show that： the development of limestone fracture in the mining area and the interbed structure of sand and gravel clay of Quaternary loose covering layer are the basic geological conditions of the production of surface subsidence,besides that,the groundwater activity is the main inducing factor of surface subsidence in the mining area. Based on the above analysis results,the layout form of the main constructions of the mining area is discussed,so as to provide some technical reference for the similar mines.