广西贺州市平桂区岩溶发育特征与分布规律

Karst development characteristics and distribution in Pinggui District,Hezhou City of Guangxi Zhuang Autonomous Region

探明平桂区岩溶发育特征及其分布规律,对于岩溶地区建设布局,特别是建设场地工程地质勘察具有重要的指导意义。平桂区中北部处于岩溶发育分布区。论文基于前人研究成果,采用资料收集、地面调查、高密度电法及钻探相结合的方法,开展平桂区岩溶地质调查,分析了岩溶发育类型与岩性及岩性组合、埋藏深度及地质构造的关系,揭示了平桂区岩溶发育特征及分布规律。研究表明,平桂区岩溶发育主要以浅表的黄金组、桂林组为主,在褶皱轴部或断层影响带内,在垂直节理裂隙和缓倾斜层面裂隙组成的裂隙系统中,岩溶发育较强;可溶岩与非可溶岩接触地段岩溶发育强;在低平谷地中的分水岭处岩溶发育亦较强烈;在水文网长期摆动的地段地面以上岩溶发育程度强烈。

Understanding karst development characteristics and distribution of Pinggui District has important guiding significance for urban construction layout in karst area,especially the engineering geological investigation of construction site.The north-central Pinggui District is located in the karst development area.Based on the previous research results,the karst geologic survey was carried out in this paper,adopting the method of data collection,ground survey,high-density resistivity and drilling.The relationship between the types of karst development and lithologic combination,burial depth and geological structure is analyzed and the karst development characteristics and distribution in Pinggui District are summarized.The researches show that the karst development in the area is mainly composed of the shallow C1h and D3g.The karst is strongly developed in the vertical jointed fracture system,slanted plane,fold axis,fault zone,interface of soluble and insoluble rock,watershed of the low valley zone,and overground with long period swing of hydrologic network.