岩溶地区隧道设计探讨

可溶岩分布面积约占我国国土面积的三分之一,大量隧道的修建使得越来越多的隧道需穿过可溶岩地带。然而可溶岩往往伴随着岩溶洞穴、地下暗河、破碎带等复杂地质构造,这无形中给隧道的修建带来极大的困难。隧道设计,围岩分级是关键,围岩级别的确定离不开超前地质预报。有鉴于此,重点分析了隧道超前地质预报和围岩分级,同时论述了隧道选线和隧道支护等方面,旨在与各位同行交流探讨,共同推进岩溶隧道设计技术的发展,降低甚至避免岩溶对隧道修建的影响。

Discussion on Tunnel Design in Karst Area

Karst-distributed area accounts for 1/3 of China′s land area, and as a lot of tunnels were built,more and more tunnels have to cross karst area.However,karst is often characterized with karst caves, underground rivers,fracture zones,which pose great difficulties to tunnel construction.Rock classification is the key point in tunnel design,and cannot be determined without the data of geological forecast.Based on this,this paper emphatically analyzes geological forecast and rock classification, and discusses on selecting the tunnel line and tunnel support,in a bid to reduce or even avoid the influence which karst acts on tunnel construction.