西宁至成都铁路同仁至甘加越岭段工程地质问题及地质选线

为了科学地指导西宁至成都铁路同仁至甘加越岭段的地质选线工作,采用综合勘察方法,借鉴兰渝铁路的勘察及施工经验,并结合灰色关联法与变权理论,查明三叠系软岩大变形及上新近系砂岩水稳性为研究区的主要工程地质问题;根据岩性、岩体完整程度、层厚、强度应力比、地下水等因素,对三叠系软岩大变形进行风险分级;构建地质选线数学模型对多种线路方案进行定量评价,得出最优方案,为地质选线提供依据。

Engineering Geological Problems and Geological Route Selection of Ridge Section of Tongren-Ganjia on Xining-Chengdu Railway

In order to scientifically guide the geological route selection for ridge section of Tongren-Ganjia on Xining-Chengdu Railway, this paper adopts the comprehensive survey method and draws lessons from the survey and construction of Lanzhou-Chongqing railway. With the gray correlation method and the variable weight theory, such major engineering geological problems in the study area are identified as the large deformation of the Triassic soft rock and the water stability of the Upper Neogene sandstone. According to lithology, rock mass integrity, rock formation thickness, intensity-stress ratio and groundwater, the risk level of the large deformation of soft rock in Triassic is classified. The quantitative evaluation of the geological route selection scheme in the study area is conducted by constructing the mathematical model, and the optimal solution is obtained, which provides references for geological route selection.