地热隧道对拉日铁路选线的影响研究

摘要

通过对拉日铁路高地热分布特征、地热形成原因、高温隧道热害对工程的影响分析，利用地热研究理论，建立计算模型，采用数值模拟技术对隧道地温场进行模拟分析，揭示隧址区地热分布规律，提出可供线路通过的地温异常区相对低温通道，并以拉日铁路吉沃西嘎隧道高地热预测和线路方案选择为例予以说明。总结高海拔地热地区选线思路及原则，为类似地区工程的设计和建设提供借鉴。%Through the analysis of highland heat distribution, geothermal formation causes and the adverse effects of high temperature heat tunnel on the engineering of the Lhasa-Shigatse Railway, the calculation mode established with geothermal research theory and numerical simulation are employed to simulate and analyze tunnel geothermal field and reveal the pattern of geothermal distribution in the tunnel area. As a result, a relatively low temperature channel is proposed to pass through areas with abnormal ground temperature, which is justified by the practice in route selection of Jiwoxi GA tunnel on Lhasa-Shigatse railway. This paper summarizes the concept and principles of route selection in high altitude geothermal areas, which provides references for the design and construction in similar areas.