泸沽湖机场构造对岩溶发育规律的控制及工程影响

Control of Lugu Lake Airport Structure for Karst Development Law and Engineering Effect

岩溶问题作为泸沽湖机场最突出的工程地质问题,备受关注。通过野外岩溶发育及地质调查,应用统计学和构造解析的方法,对场区的褶皱、节理构造进行了深入研究,总结岩溶发育的形成机理,发现节理构造对场区岩溶的发育起主导控制作用。褶皱构造及其形成过程中伴生的节理构造的方向性、强度与场区岩溶发育所表现的方向性、规模之间有着密切地联系,即在褶皱形成过程中所形成的四套节理:平面共轭X型剪节理、剖面共轭X型张节理、横张节理、纵张节理,明显地控制了岩溶发育的方向和规模,对工程的设计、施工产生了重大影响。

As the most prominent engineering geological problems for Lugu lake airport,karst problem is more concerned.Through field geological investigations on karst development,the fold and joint structure in the airport area are further studied by the statistics and structural analysis method,the formation mechanism of karst development is summarized,and the joint structure plays a leading control role in karst development.The fold structure and direction and strength of associated joint structure with its formation,are closely linked with the direction and scale with karst development,that is,four groups of joints are formed in the fold formation process：plan conjugate X-type shear joints,profiles conjugate Xtype tension joints,horizontal tension joints,and vertical tension joints,they obviously influence the direction and scale of karst development,and they have important effect on the design and construction of projects.