大瑞铁路高黎贡山隧道热害评估

Estimation of Heat-harm of Gaoligong Mountain Tunnel of Dali-Ruili Railway

研究目的:高温热害问题是深埋隧道的常见地质灾害问题之一。本文根据调查中取得的实际资料,考虑岩性、断层、地温、主要蓄水构造、主要河流五个影响因素,采用层次分析法和专家打分法确定权重和等级标准,通过GIS空间分析对隧道地区的热害危险性进行评估和区划,为高温隧道线路的选择、设计和施工提供参考依据。研究结论:研究区的热害整体上呈北西—南东向分布,断裂对热害的控制作用显著,热害主要分布在花岗岩和变质岩地区;沿C12K线路方案存在四个易发生突热水灾害的区段,这四个区段的特点是断裂集中,位于岩浆岩地区、变质岩地区或是储水盆地的边缘。

Research purposes：The high temperature heat-harm is one of common geological disasters of deep-buried long tunnels.According to the practical data,and considering the influence factors,such as the lithology,fault,ground temperature,hot spring,the main reservoir structure,and the major river,the heat-harm danger in the tunnel area was estimated and sorted with the weights and and grade standards by utilizing analytic hierarchy process and expert evaluating method,and the GIS space analysis for the purpose of providing the reference to the selection,design and construction of the tunnel in high temperature region. Research conclusions：The heat-harm in the studied area was generally distributed in the west area from the north and in east area from the south,obviously controlled by the fault,and concretely speaking the heat-harm was mainly distributed in granite and metamorphosed rock regions.Along the C12K route,there were four sections where the hot water-bursting was easy to happen,featured with the fault concentration,located in the magmatic area and metamorphic areas or catchment basin edge.