袁广祥, 尚彦军 林达明, . 2009: 帕隆藏布流域堆积体边坡的工程地质特征及稳定性评价. 工程地质学报, 17(2): 188-194.
    引用本文: 袁广祥, 尚彦军 林达明, . 2009: 帕隆藏布流域堆积体边坡的工程地质特征及稳定性评价. 工程地质学报, 17(2): 188-194.
    YUAN Guangxiang, SHANG Yanjun, LIN Daming. 2009: ENGINEERING GEOLOGICAL PROPERTIES AND STABILITY ANALYSIS OF MORAINE DEBRIS SLOPES IN PALONG RIVER DRAINAGE AREA ALONG SICHUAN-TIBET HIGHWAY. JOURNAL OF ENGINEERING GEOLOGY, 17(2): 188-194.
    Citation: YUAN Guangxiang, SHANG Yanjun, LIN Daming. 2009: ENGINEERING GEOLOGICAL PROPERTIES AND STABILITY ANALYSIS OF MORAINE DEBRIS SLOPES IN PALONG RIVER DRAINAGE AREA ALONG SICHUAN-TIBET HIGHWAY. JOURNAL OF ENGINEERING GEOLOGY, 17(2): 188-194.

    帕隆藏布流域堆积体边坡的工程地质特征及稳定性评价

    ENGINEERING GEOLOGICAL PROPERTIES AND STABILITY ANALYSIS OF MORAINE DEBRIS SLOPES IN PALONG RIVER DRAINAGE AREA ALONG SICHUAN-TIBET HIGHWAY

    • 摘要: 位于藏东南的帕隆藏布流域,处在东喜马拉雅构造结的北缘,是新构造强烈隆升区,断层、褶皱等地质构造发育。在青藏高原隆升及气候变化等内外动力作用下,研究区内堆积体分布广泛,具有独特的工程地质特征并成为该区内地质灾害的主要物源。由于河流的下切及川藏公路的修建,形成了许多高陡的堆积体边坡,以冰碛边坡最为典型。由于其特殊的物源特征及形成过程,冰碛物具有粒度分布范围广、粗粒含量多等与其他沉积物不同的粒度特征。冰碛物粒度分布范围广的特征,导致随着研究尺度的不同,其结构特征也不相同,具有明显的尺度效应。冰碛土的力学强度一般强于其他堆积体,但受不同粒径颗粒的含量及分布、形成时代的影响,其力学特征也有所差异。作者对川藏公路沿线部分典型的剖面进行了量测,所量测的剖面虽然只是整个斜坡的一部分,与经验数据相比,仍表现出高陡的特征,而且很多边坡在既高且陡的形态下仍能保持稳定。本文以极限平衡理论为基础,采用多种方法对这类边坡的稳定性进行计算分析,求出边坡的安全系数。考虑各种地震烈度下边坡的稳定性,得出这些边坡的安全系数与地震加速度具有严格的指数相关关系。

       

      Abstract: The Ranwu to Lulang section of Sichuan-Tibet highway locates in Palong River drainage area, north edge of eastern Himalayan structure junction. The tectonic activities are so strong that a large number of faults and folds are formed in the area. Under coupling of the endogenic and exogenic geological processes, there are many loose Quaternary deposits, and they are the main carrier of most geological hazards. Under the river cutting and construction of Sichuan-Tibet highway, many slopes are formed, especially moraine slopes. The particle size characteristic of moraine is different with other sediments, because of the particles distribution from clay to gravel and more coarse particles. The structure and mechanical features of the slopes are also different with other slopes because of particle size characteristics, and they are varied with the size scale. At the same time, the mechanical feature is affected by content and distribution of the different particles and age of moraine. This paper presents the surveyed results of some typical moraine slopes along the highway. A laser profiler and a total station were used in the topographical survey. It is obvious that the slopes are high and steep, but they are stable. Based on the limit equilibrium theory, themoraine high slopes are analyzed for their stabilities. And Different methods are used to analyze the stability of the slopes in natural state. At last, the stabilities of the slopes are estimated wuth the effect of earthquake.

       

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