考虑初始条件变异的蠕滑型滑坡稳定性评价研究

doi:10.13722/j.cnki.jrme.2019.1079

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摘要蠕滑型滑坡会产生大量的地面裂隙，改变坡面角度和地形起伏，是破坏基础设施的主要地质灾害。因此，对蠕滑型滑坡进行科学的稳定性评价具有重要的科学意义和工程应用价值。因传统的极限平衡法和数值模拟没有考虑坡体沉降等初始环境信息的变异，故不能精确地解释蠕滑型滑坡的阶梯状变形。基于蠕滑型滑坡试验，通过理论模型和国内外案例分析，着重对蠕滑型滑坡的内部成因机制进行探讨，建立新的力学模型并对其稳定性进行评价。试验得出，断裂带上坡体的沉降冲击作用，使得边坡滑移的初始条件发生变化：初始动能不为0是蠕滑型滑坡发生的主要原因。改进的稳定性评价结果，稳定性系数一度降到1.0以下，较好地反映了滑坡阶梯状变形。结论得出，在蠕滑型滑坡进行稳定性评价时，不仅需要考虑不断变化的力学指标和地下水等边界条件，还需要考虑坡体沉降等环境变异而改变的滑移初始条件信息。该稳定性评价方法可以为人们更好的应对蠕滑滑坡灾害提供有效参考。

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	杜岩1
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	贾金禄2
	丛晓明2
	吴允权1

关键词 ：边坡工程, 蠕滑型滑坡, 稳定性评价, 初始动能, 后缘坡体, 初始条件变异

Abstract：Creeping landslide causes significant erosion，regulate hill-slope angles and topographic relief，and is one of the main geological disasters that damage infrastructure. Therefore，the stability evaluation of creeping landslide has important scientific significance and application value in the engineering field. Traditional limit equilibrium method and numerical simulation often do not consider the information of initial slip conditions changed by the settlement of the trailing edge slope，thus they cannot explain the stepped deformation of creeping landslide. Based on the creeping landslide experimental case，this study focuses on the mechanism of creeping landslide，establishes a new mechanical model and evaluates its stability. The results show that the settlement of the fault zone changes the initial condition of the slope. The cause of the creeping landslide is that the initial kinetic energy is not zero. Considering the change of the initial conditions，the stability coefficient once dropped below 1.0，which reflected and explained the stepped deformation of creeping landslide. When evaluating the stability of creep-type landslides on the fault zone，it is necessary to consider not only the changing mechanical indexes and boundary conditions such as groundwater，but also the initial condition information changed by the environmental variation such as large settlement of trailing edge slope. The improved stability evaluation method can offer a foundation for better responses to creeping landslide in engineering.

Key words： slope engineering creeping landslide stability evaluation initial kinetic energy rear slope variability of initial conditions

引用本文:

杜岩1，2，陆永都1，谢谟文1，贾金禄2，丛晓明2，吴允权1. 考虑初始条件变异的蠕滑型滑坡稳定性评价研究[J]. 岩石力学与工程学报, 2020, 39(S1): 2828-2836.
DU Yan1，2，LU Yongdu1，XIE Mowen1，JIA Jinlu2，CONG Xiaoming2，WU Yunquan1. Stability evaluation of creeping landslide considering variation of initial conditions. , 2020, 39(S1): 2828-2836.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.1079 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/2828

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