成渝中线高铁主要工程地质问题及减灾选线

Main Engineering Geological Problems of Chengdu-Chongqing Middle Line High Speed Railway and Route Selection for Disaster Reduction

研究目的:成渝中线高铁位于四川盆地内,是继川藏铁路后推动时速400公里级高速铁路关键技术研究的新纪元工程,沿线工程地质和水文地质条件较为复杂,需要详细查明主要工程地质问题,开展减灾选线研究,从源头规避地质灾害风险,以期为成渝中线高铁防灾减灾服务。研究结论:(1)成渝中线高铁建设主要面临煤矿及锶矿采空区、岩溶及岩溶水、缓倾软质岩层、有害气体、高温热水等工程地质问题;(2)针对本线对地基变形控制、结构可靠度、安全风险防控等要求极为严格,创新提出了各类主要工程地质问题立体空间绕避或通过的地质选线原则;(3)根据地质选线原则,选择了工程地质条件相对较优、工程风险可控的铜梁取直和经大足、铜梁方案;(4)本研究成果对类似工程地质条件的高速铁路建设具有借鉴意义。

Research purposes:Chengdu-Chongqing Middle Line high speed railway is located in Sichuan Basin,which is a new era project to promote the key technology research of 400 km/h high-speed railway after Sichuan-Tibet railway.The engineering geological and hydrogeological conditions along the line are complex,so it is necessary to identify the main engineering geological problems in detail,carry out the research on route selection for disaster reduction,and avoid the risk of geological disasters from the source,in order to provide disaster prevention and mitigation services for Chengdu-Chongqing Middle Line high speed railway.Research conclusions:(1)The construction of Chengdu-Chongqing Middle Line high speed railway is mainly faced with engineering geological problems such as coal mine and strontium mine goaf,karst and karst water,gently inclined soft rock,harmful gas,high-temperature hot water,dangerous rock falling and so on.(2)In view of the strict requirements for foundation deformation control,structural reliability and safety risk prevention and control of the line,the geological route selection principle of avoiding or passing through three-dimensional space for various major engineering geological problems is proposed.(3)According to the principle of geological route selection,the schemes of straightening Tongliang and crossing Dazu and Tongliang with relatively better engineering geological conditions and controllable engineering risks are selected.(4)The research results have reference significance for high-speed railway construction with similar engineering geological conditions.