岩溶地区高速公路隧道之间处理方案的对比分析

COMPARATIVE ANALYSIS OF TREATMENT SCHEMES FOR EXPRESSWAY CROSSING UNDERGROUND RIVER IN KARST AREA

广西大部分地区为典型的喀斯特地貌,浅层岩溶尤为发育。本文以西南岩溶地区某高速公路两隧道之间洼地原设计中桥方案变更为盖板涵为例,说明工程建设应充分利用区域资料,同时结合钻探、物探等方法综合分析岩溶地区地下水补径排、动态及岩溶发育特征,最终得出岩溶洼地内利用盖板涵横跨地下河通道是优于其它方案的,不仅工程造价低,而且大大减少工期,可保证工程项目的顺利实施及安全运营。

Most areas of Guangxi are typical Karst landforms and shallow karst is particularly developed.In this paper,a case of crossing the underground river treatment scheme between two tunnels in a karst area is taken as an example（the original design scheme is the change of the middle bridge as the cover culvert）.It shows that the construction should make full use of the regional data and combine drilling with drilling.The method of geophysical prospecting and so on comprehensively analyses the characteristics of groundwater drainage,dynamic and karst development in karst area.Finally,it is concluded that the use of cover plate culvert across the underground river channel in karst depression is superior to other schemes,not only the cost of the project is low,but also the construction period is greatly reduced,which can ensure the smooth implementation of the project and the safe operation of the project.