Karst Systems and Their Influence upon the Engineering in the Western Section of Hu-Rong Expressway

This paper discusses the influence of the Karst development on the planning project in the western section of Hu-Rong Expressway.Firstly, the characteristic of the karst landform in the section from Gaoping to Jinxin of Hu-Rong Expressway is introduced,the cause of the Karst development is analyzed,and the development history of the regional Karst is studied. Secondly, the development regularity and the scale of two Karst water systems,centralization runoff and decentralization runoff system,are studied through the analysis of the development of the karst and the underground water stock of different strata,regional hydro-geologic conditions and the relation of recharge,runoff and discharge of the ground and underground water.Based on the characteristic of different Karst water system,the Karst landform and Karst water system influence is evaluated,and recommendations are given for use of different engineering methods.Finally,the main Karst system characters and their influence on the project is summarized.These results show that the Karst in the third section of the Jialinjiang complement is deep and the expressway line should be kept away from it.