田尤, 陈龙, 黄海, 高波, 张佳佳. 西藏澜沧江流域察雅县城滑坡群成因及现状稳定性[J]. 地质通报, 2021, 40(12): 2034-2042.
    引用本文: 田尤, 陈龙, 黄海, 高波, 张佳佳. 西藏澜沧江流域察雅县城滑坡群成因及现状稳定性[J]. 地质通报, 2021, 40(12): 2034-2042.
    TIAN You, CHEN Long, HUANG Hai, GAO Bo, ZHANG Jiajia. Origin and stability of landslides in Chaya County, Lancang River Basin, Tibet[J]. Geological Bulletin of China, 2021, 40(12): 2034-2042.
    Citation: TIAN You, CHEN Long, HUANG Hai, GAO Bo, ZHANG Jiajia. Origin and stability of landslides in Chaya County, Lancang River Basin, Tibet[J]. Geological Bulletin of China, 2021, 40(12): 2034-2042.

    西藏澜沧江流域察雅县城滑坡群成因及现状稳定性

    Origin and stability of landslides in Chaya County, Lancang River Basin, Tibet

    • 摘要: 地球内外动力耦合叠加人类工程活动下的大型滑坡灾害是青藏高原工程建设面临的工程地质问题之一。针对在澜沧江流域察雅县城南侧斜坡新发现的9处大型—特大型滑坡,采取野外调查、试验测试和数值计算,分析了滑坡的特征、成因和现状稳定性。结果表明:①察雅县城滑坡具有规模大、切割深、地形阻止系数大等特征,滑坡堆积体现状具有多期蠕滑变形,表现为牵引式滑移的变形破坏特点,再次活动主要与降雨、河流侵蚀、人类工程活动等因素有关;②综合滑坡的发育特征、运动特征、物质结构与组成、断层与历史地震4个方面,初步判断察雅县城滑坡的诱发因素为内动力地质作用,为历史地震滑坡;③古妥尔滑坡堆积体在天然状态下处于基本稳定-稳定状态,在强降雨状态下滑坡前缘局部或整体处于欠稳定状态,较易-易发生滑动。新发现的大型—特大型滑坡拓宽了青藏高原"三江"地区地震滑坡的分布范围,对研究昌都及周边地区的地震历史、断裂活动性、地貌形成演化等方面提供了重要的佐证资料,滑坡堆积体现状稳定性分析结果可为县城的扩建及地质灾害风险管控提供一些参考。

       

      Abstract: Large-scale landslide disasters under the coupling of internal and external dynamics of the earth and human engineering activities are one of the engineering geological problems faced by major engineering constructions on the Qinghai-Tibet Plateau. Based on the field investigation, experimental test and numerical calculation of the newly discovered 9 large-extra large landslides on the southern slope of Chaya County in the Lancang River Region, the characteristics, causes and current stability of the landslides were analyzed. The results show that the Chaya landslide has the characteristics of large scale, deep cutting, and large topographic blocking coefficient; the landslide accumulation is represented by multi-stage creep deformation characterized by traction slip; and the deformation is mainly related to factors such as rainfall, river erosion and human engineering activities. The integration of the development characteristics, movement features, material structure and composition, faults and historical earthquakes of the landslides indicates that the inducing factor of the landslide in Chaya County is internal dynamic earthquake action, and it is a historical earthquake landslide. The Guttor landslide accumulation body is basically stable or stable in its natural state, and the front edge of the landslide is in a partially or overall under-stable state under heavy rainfall conditions, which is relatively easy to slip. The newly discovered large-extra-large ancient landslide provides important supporting information for the study of the earthquake history, fault activity and geomorphological evolution of Changdu and surrounding areas. The evaluation results of current stability of landslide accumulations can provide some scientific basis for the expansion of the county and the risk management as well as control of geological disasters.

       

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