大临线主要工程地质问题及地质选线

Main Engineering Geology Problems and Geological Railway Location of Dali-Lincang Railway

研究目的:大临线沿线地形起伏大、地层岩性及构造复杂、不良地质发育,工程地质及水文地质条件非常复杂,为合理选择线位,开展地质选线研究,确保线位合理、方案可行。研究结论:(1)经综合地质工作,确定大临线主要的工程地质问题为活动断裂、高地温、滑坡、泥石流、高地应力、顺层、有害气体及水库坍岸等,对线路方案及工程措施影响很大;(2)通过地质选线工作,确定了大麦地高线位方案、巍山盆地东侧方案、巍宝山西河左岸方案、黑惠江高线位方案、澜沧江上游桥位方案、红豆山短隧方案、云县盆地东侧方案为推荐方案,工程方案有效地避开了主要的不良地质问题,降低了工程施工风险和运营隐患;(3)本研究成果对西南山区铁路工程勘察及地质选线具有借鉴作用。

Research purposes： Along the Dali - Lincang railway, there were faced with the problems such as undulating terrain, complex stratigraphie lithology and structure, the poor geological development as well as complicated engineering geology and hydrogeological conditions. A research of geological route selection was carried out for reasonable selection of route position, which may ensure its position rationality and scheme feasibility. Research conclusions： （ 1 ） Through comprehensive geological work, the main engineering geology challenges of the Dali - Lincang railway were active fault, high ground temperature, landslide, debris flow, high crustal stress, bedding layer, harmful gas and reservoir bank collapse, which had great influence on the line scheme and the engineering measures. （2） Through the geological route selection, determine the Damaidi high location scheme, the east side of the Weishan basin scheme, the left bank of the Weibaoshan Xihe scheme, Heihuijiang high location scheme, the upper reaches of the Laucangjiang Bridge scheme, the Hongdoushan short tunnel scheme, and the east side of the Yunxian basin scheme were recommended, the engineering scheme effectively avoids the adverse geological problems, reduces project risk and operational risk. （3）The research results can be used for reference to railway engineering survey and geological route selection in the southwest mountain area.