桂西北山区某隧道群隧区岩溶发育规律研究

摘要

The types of karst ofmountain tunnel in north-westGuangxi are mainly for continuous peak cluster depression, ponor and spillway tunnel elimination, karst caves and underground rivers.It explained the the causes of formation of karst morphological development and analyses the geological factors on the development pattern of control function from four aspects, which contained the tunnel area topography and geomorphology, geological structure, stratum lithology and groundwater.The results showed that the zone was formed by the erosion-corrosion shall slack plexus deep depression physiognomy.At the same time, the regional tectonic control of karst development main direction;The good karst conduit was formed because of thedissoluble rock widely distributedand the groundwater development;For the vadose zone thickness, the vertical karst development strongly.The research has important theoretical guiding significance to the similar engineering.%桂西北山区隧道群隧区的岩溶类型主要为连片峰丛洼地、落水洞及消溢洪洞、溶洞、暗河.本文分别从隧区的地形地貌、地质构造、地层岩性及地下水四方面阐释了岩溶形态发育的成因,并分析了各地质因素对其发育规律的控制作用.研究结果表明:区内属侵蚀-溶蚀作用形成的连片低峰丛深洼地地貌,同时区域构造控制了岩溶发育的主要方向;可溶岩广布且地下水发育使隧区形成导水性好的岩溶管道;包气带厚度大、垂直方向岩溶强烈发育.研究成果对类似实际工程具有重要的理论指导意义.