从路线穿越巨型古滑坡谈山区公路地质选线

Discussion on geological route selection of mountainous highway from route crossing giant ancient landslide

山区公路中,复杂地形、地貌、工程地质条件、场地环境等极大的影响着公路线位确定。以蒙象路为依托,基于白石巨型古滑坡两阶段勘察成果,以地质选线作为主要手段对项目白石古滑坡路段进行两阶段方案比选,包含线位工程地质条件、路基与桥梁的工程类型适应性等内容,最终采用在初设E线方案基础上优化后的A线方案,在项目已施工完成通车情况下验证了前期地质选线实践的合理性,进而引伸出山区公路地质选线综合性要点。公路地质选线应以地形、地质条件为基础进行综合性选线及精细化选线,产生最优解以确定最终路线方案;对于选线中遇到大型不良地质体情况,应查明其规模、性质等,合理评价其现状和实施工程建设后的整体及分区稳定性,有条件时可谨慎通过,必要时应采用适宜的工程措施。

In mountainous highways,complex terrain,landform,engineering geological conditions,site environment and so on greatly affect the determination of highway line position.Based on Mengxiang Road and the two-stage investigation results of Baishi giant ancient landslide,this paper compares and selects the two-stage scheme of Baishi ancient landslide section with geological route selection as the main means,including the engineering geological conditions of line position,the adaptability of subgrade and bridge engineering types,etc..Finally,the optimized A-line scheme based on the initial E-line scheme is adopted.The rationality of the previous geological route selection practice is verified when the project has been completed and opened to traffic,and then the comprehensive key points of geological route selection of mountainous highway are extended.The geological route selection of the highway should be based on the topography and geological conditions to carry out comprehensive route selection and refined route selection,and generate the optimal solution to determine the final route plan;for the case of large-scale unfavorable geological bodies encountered in the line selection,its scale and nature should be identified,and its current situation and the overall and regional stability after the implementation of the project construction should be reasonably evaluated.If conditions permit,it can be carefully passed,and appropriate engineering measures should be adopted when necessary.