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