平推式滑坡成因机制及其稳定性评价

doi:10.13722/j.cnki.jrme.2018.1251

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摘要平推式滑坡是一种特殊类型的滑坡，其隐蔽性往往会带来灾难性的后果。以重庆开县桌子石滑坡为案例，基于最新的研究成果和现场勘察结果，对滑坡的成因机制进行分析并对稳定性计算公式进行修正。理论和模型实验发现，软硬相间岩床会造成坡体产生阶梯式沉降，使得平推式滑坡下滑力增大，从而在较低的水位和降雨条件下发生快速下滑破坏。当后缘坡体发生阶梯沉降时，传统稳定性系数计算平均误差高达32.27%，采用考虑阶梯沉降的修正公式更加符合实际。在对桌子石滑坡进行稳定性计算时，后缘坡体阶梯沉降产生的推力是平推式滑坡稳定性评价不可忽略的关键因素。基于修正公式的稳定性系数由原有的1.179下降为1.031，与实际结果相符。因此，在对软硬相间岩床平推式滑坡进行安全评价分析时，要综合考虑阶梯式沉降等造成的抗滑力与滑动力因子的变异，才能保证稳定性评价的准确。

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	杜岩1
	谢谟文1
	吴志祥1
	刘秋强2
	贺铮1

关键词 ：边坡工程, 平推式滑坡, 成因机制, 阶梯式沉降, 稳定性评价

Abstract：Translational landslide is a unique in the types of landslide that very often produces devastating consequences as its concealment. Latest studies and surveys results showed us the cause of Zhuozishi landslide in Kaixian，Chongqing City. We in this respect have built a new model for the translation landslide and have modified the formula previously used for stability measurement. The theoretical and experimental application of the model showed that the sliding force and the anti-sliding force of the landslide have been increased by the layered sedimentation of the soft and hard inter-phase rock bed. This resulted in the translational landslide in respect to lower water level or even lighter rainfall. The possibility of average error of the conventional stability coefficient is ranged up to 32.27% due to the stepped/layered formation of the bed rock. The new and modified formula is more objective in respect of considering the role of staircase subsidence. During the evaluation regarding the safety of Zhuozishi landslide，the coefficient of stability which was based on the new modified formula was reduced to 1.031 from 1.179 which is reliable and very much consistent with the actual and concrete observation results. It was find out through the result that the stepped settlement caused an increased sliding force which can be termed as the key factor in the assessment and evaluation of stability of translational landslide. It is therefore，suggested that for ensuring the accuracy of the safety assessment and evaluation of the translational landslide on the soft-hard interlaced rock strata，the variation and difference between the sliding and anti-sliding forces，primarily caused by stepped and layered subsidence，must be taken into consideration.

Key words： slope engineering translational landslide genetic mechanism stepped settlement safety evaluation

引用本文:

杜岩1，谢谟文1，吴志祥1，刘秋强2，贺铮1. 平推式滑坡成因机制及其稳定性评价[J]. 岩石力学与工程学报, 2019, 38(S1): 2871-2880.
DU Yan1，XIE Mowen1，WU Zhixiang1，LIU Qiuqiang2，HE Zheng1. Genetic mechanism about translational landslide and its safety evaluation. , 2019, 38(S1): 2871-2880.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1251 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2871

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