高寒高海拔山区隧道及其引线工程地质选线

Tunnels in Alpine and High Altitude Mountainous Areas and Their Engineering Geological Route Selection

为总结适宜西昆仑高寒高海拔山区隧道及其引线的地质选线方法,归纳西昆仑山区普遍存在的崩滑塌、多年冻土等主要工程地质问题,针对性地制定了高寒高海拔山区工程地质选线原则,以该地区某在建长隧道作为选线实例,从隧址区工程地质条件、隧道长度和纵坡、引线方案进行地质选线比选论证确定了最优路线方案,提出以控制性隧道工程规模和进出口标高为总体方案的制定要点,合理选择路基断面形式的地质选线原则。现场施工情况表明,多年冻土路基边坡整体稳定,既有河道保护较好,有效绕避高寒高海拔山区坡面溜塌及多年冻土病害,为西昆仑山区公路地质选线提供了有利的参考。

In order to summarize the geological route selection methods suitable for the tunnels and their leads in the alpine and high-altitude mountainous areas of West Kunlun,and to summarize the major engineering geological problems such as collapse and permafrost prevalent in the West Kunlun Mountains,a targeted formulation of the alpine and high-altitude mountainous areas was formulated.Based on the principle of engineering geological route selection,taking a long tunnel under construction in this area as an example of route selection,the optimal route scheme was determined through the comparison and demonstration of geological route selection based on the engineering geological conditions of the tunnel site,the length of the tunnel,the longitudinal slope and the lead-line scheme,and the proposed route was proposed.Taking the scale of the controlled tunnel project and the elevation of the entrance and exit as the main points of formulating the overall plan,the principle of geological alignment of the subgrade section form is reasonably selected.The on-site construction situation shows that the permafrost subgrade slope is stable as a whole,and the existing river courses are well protected,which can effectively avoid slope collapse and permafrost disease in the alpine and high-altitude mountainous areas,which provides favorable conditions for the road geological route selection in the West Kunlun Mountains.