沪昆客专麻拉寨隧道岩溶发育规律及突水原因探析  

Analysis of Karst Development Law and Water Burst Cause of Malazhai Tunnel in Shanghai—Kunming Passenger Dedicated Railway

作　　者：张会刚[1] 张广泽[1] 喻洪平[1] 何海平 ZHANG Huigang ZHANG Guangze YU Hongping HE Haiping(China Railway Eryuan Engineering Group Co. , Ltd. , Chengdu 610031, China CR17 BG No. 3 Engineering Co. , Ltd. , Shijiazhuang 050081, China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]中铁十七局集团第三工程有限公司,石家庄050081

出　　处：《路基工程》2017年第1期208-212,共5页Subgrade Engineering

摘　　要：针对麻拉寨隧道水害,通过对地层岩性、地质构造、地形条件等岩溶发育控制因素的分析,推断出该段岩溶发育具有方向性,岩溶洼地、槽谷、落水洞主要分布在断层延伸方向700~1 300 m,垂直断层方向500 m以内,即地质构造控制该段岩溶发育的方向性;从隧道开挖改变地下水通道、施工期间历次降雨考验、岩溶通道的贯通性、强降雨引起水压变化等方面,分析了隧道涌突水发生的原因,主要是强降雨时其泄水能力严重不足而造成高水头,在隧底中心水沟及边墙脚等薄弱部位产生劈裂破坏突水。Exampling the water damag as lithology, geological structure and e of Malazhai Tunnel, based on analysis of karst controlling factors such terrain conditions, the direction of the karst development is inferred. Karst depressions, karst trough valley and aven are mainly distributed at 700 - 1 300 m in fault extension direction of and within 500 m in the vertical direction of fault. That is to say, geological structure controls the direction of the karst development. The cause is analyzed for the water burst in the tunnel based on the change of groundwater channel by tunnel excavation, all previous rainfall tests during construction, perforation of karst channel, water pressure change caused by heavy rainfall. The water burst is mainly caused high head resulting from seriously insufficient discharging capacity during heavy rainfall, and breakage of weak part of central ditch at tunnel bottom and wall foot.

关 键 词：客运专线 岩溶隧道 强降雨 构造裂隙 水害 原因分析 

分 类 号：P642.25[天文地球—工程地质学]