青藏铁路察尔汗盐岩路基病害防治技术研究

Study on Roadbed Disease Control Techniques of Qarhan Salt Lake Along Qinghai-Tibet Railway

青藏铁路西格段路经察尔汗盐湖地区,该地区地层上部主要以盐岩为主,其主要成分为氯化盐结晶体,极易受低矿化度水的影响。大气降雨、低矿化度地下水和毛细水的作用会导致路基产生盐溶,发生溶陷、垮塌等病害,危及正常运营。青藏铁路在施工期对岩盐地基根据盐岩特征进行了换填、碾压等处理,对盐岩路基本体用土工布进行全断面隔水处理,并在部分段落修建自流式排水井;且在后期运营中,对盐岩路基采用隔水板、集水槽、注浆等措施进行处理,取得了良好效果。

The Qinghai-Tibet railway route Qarhan Salt Lake,whose top is covered with rock salt,The main components in rock salt,therefore it is vulnerable to low mineralized water. Atmospheric rainfall,groundwater and capillary water of low mineralized can easily lead to corrosion occurrence roadbed,collapsibility,boiling and other diseases. Salt rock roadbed is treated by exchanging-fill,rolling processing in the construction period,subgrade body of salt rock roadbed with geotechnical fabric is treated by water insulation,and the construction of gravity drainage well; and in the later operation,dealing with water stop sheet,header tank,injection grouting the methods such as rock salt roadbed,and good results are achieved.