石漠化地区碳酸盐岩溶蚀-蠕变特性及其微观机理研究

项目名称： 石漠化地区碳酸盐岩溶蚀-蠕变特性及其微观机理研究

项目编号： No.41302220

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 刘琦

作者单位： 同济大学

项目金额： 23万元

中文摘要： 贵州岩溶石漠化地区广泛分布的碳酸盐岩，受外力地质作用、次生人为荷载以及地下水的渗流-化学作用下，由于其岩性与节理裂隙的发育程度不同，使得岩石的风化成土及石漠化演化的过程存在差异。因此，针对不同岩性的含裂隙碳酸盐岩，开展应力-渗流-化学耦合作用下碳酸盐岩溶蚀-蠕变特性及其微观机理的研究，对于分析石灰岩和白云岩地区风化成土的过程及石漠化成因具有重要的意义。本研究通过开展不同水环境条件下单裂隙碳酸盐岩蠕变试验，着重分析应力-渗流作用下水岩化学反应的特性及含裂隙岩体在耦合作用下的蠕变变形特征；从微细观的角度对比分析石灰岩和白云岩化学溶蚀与蠕变的特征；利用COMSOL多场耦合软件对单裂隙碳酸盐岩在应力-渗流-化学作用下的耦合过程进行模拟。从而探索岩性与岩溶发育规律、成土过程及石漠化成因之间的关系，为石漠化防治措施的选择提供科学依据。

中文关键词： 岩溶石漠化；石灰岩和白云岩；应力-化学耦合作用；溶蚀；蠕变

英文摘要： Carbonate rocks are widely distributed in the karst rocky desertification region of Guizhou Province. There are differences during weathering and pedogenesis and the rocky desertification process, the reason is that different lithology and the joint crack development of carbonate rocks, affected by complicated geological processes and secondary artificial load, and groundwater hydro-chemical coupling interaction. Therefore, study on the dissolution- creep characteristics and it's microscopic mechanism of carbonate rocks under mechanico-hydro-chemical coupled condition，it has important significance for analysis of weathering and pedogenesis and the rocky desertification process. The research using the creep experiments of carbonate with single fracture in different water environment, emphatically analysis characteristics of water-rock interaction and creep deformation characteristics of fractured rock mass under hydro-chemical action. Comparative analyze to chemical dissolution and creep characteristics between the limestone and dolomite from the microscopical viewpoint. Simulate the mechanico-hydro-chemical coupling process by the soft ware of COMSOL Multiphysics. Eexplore the relationship between lithology, karst development law, soil-forming process and rocky desertification initiation, and provide a scientifi

英文关键词： Karst rocky desertification；limestone and dolomite；mechanical-chemical coupling；dissolution；creep