川藏公路102滑坡群地段基覆界面问题研究  

Study on discontinuity between bedrock and Quaternary covers in No.102 landslide group section of Sichuan-Tibet highway

作　　者：曾庆利[1] 杨志法[1] 尚彦军[1] 张路青[1] 袁广祥[1] 祝介旺[1] 

机构地区：[1]中国科学院地质与地球物理研究所,工程地质力学重点实验室,北京100029

出　　处：《水文地质工程地质》2008年第3期1-6,共6页Hydrogeology & Engineering Geology

基　　金：国家重点基础研究发展规划项目(2002CB412701)

摘　　要：边坡坡体结构中,下伏基岩与上覆松散堆积体间接触界面(即基覆界面)的形态特征对边坡稳定性往往起决定性作用,同时也是边坡稳定性计算和边坡抗滑工程设计的重要依据。本文针对著名的川藏公路102滑坡群路段边坡基覆界面特征问题进行了初步研究,根据该路段河谷冰川地貌特征、2#滑坡后壁地下水渗水带特征和少量物探钻孔资料提出了新的基覆界面位置,即102滑坡群路段边坡基岩与上覆松散堆积体的界面位置在平均海拔2 325m,而不是前人所认为的帕隆藏布江河谷基岩出露处(海拔2 120m)。该新认识对2#滑坡工程整治设计方案选择具有重要指导意义,并建议首先考虑隧道方案。The characteristics of the discontinuity between bedrock and loose deposits （namely bedrock-cover discontinuity） in the slope structure always make an important role on the slope＇s stability. Moreover, it is also the important basis with regard to the slope stability analysis and design of the landslide countermeasure solutions. According to the problem of the bedrock-cover discontinuity of the famous No. 102 landslide group section of Sichuan-Tibet highway, the paper, based on the characteristics of the glacial geomorphology and the groundwater seepage zone in the backwall of the 2 # landslide and a few of geophysical and borehole materials, puts forward a new location of the discontinuity, i.e., the discontinuity is located at average altitude of 2 325 meters, but not 2 120 meters near the Parlung River valley, which was determined by previous researchers. The new cognition is of great important significance to the selection of engineering countermeasure solutions in the 2 # landslide. In the paper, the solution of tunnel is recommended.

关 键 词：松散堆积体 基覆界面 河谷冰川地貌 102滑坡群 川藏公路 

分 类 号：P642.22[天文地球—工程地质学]