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| Mechanism and stability analyses of progressive failure of thrust-type landslides |
| LU Yingfa1，HUANG Xuebin2，LIU Defu1 |
| (1. School of Civil Engineering，Hubei University of Technology，Wuhan，Hubei 430068，China；
2. Headquarter of Geological Hazard Prevention and Mitigation in the Three Gorges Reservoir，Yichang，Hubei 443200，China) |
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Abstract A new method of stability analyses of thrust-type landslides was established based on the current methods of landslide stability analysis. A critical state between the failure and stable states was suggested based on the mechanism of thrust-type landslides and its determination was also proposed. Two failure modes were proposed for the progressive movement landslide. For the mode I，the whole slope failure occurred along the soft-weak layer. For the mode II，the landslide failure occurred in the rear edges along the soft-weak layer，and the shear failure happened at the front edge along the sliding body. The critical state moved from the rear zone to the front zone of the landslide progressively，i.e.，new critical state and failure zone are obtained for a progressive failure landslide during the deformation. The“S”shape curve of time and deformation is shown for the different points on the sliding face during deformation period. The relationship of deformation at different points on the sliding face and the height of landslide presents parabolic curve characteristics. Three kinds of curves between time and deformation were proposed based on the mechanical behavior classification of rock-soil mass. Types a and b are the unstable and stable curves between time and deformation of type I respectively，type c is the stable curve between time and deformation of type III. The stable analysis method for computing comprehensive sliding- resistance，main thrust force and displacement based on deformation was suggested. The cause of divergence of FEM was analyzed. A new method to take the sliding face as a boundary condition of FEM was proposed for landslide stability analyses. The condition of sliding face boundary method was described not only with the perfect elasto-plastic model(PEPM)，but also with the new constitutive model(JCM).
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| [1] 郑孝玉. 滑坡预报研究方法综述[J]. 世界地质，2000，19(4)：370–374.(ZHENG Xiaoyu. Summary on the methods of prediction to landslide[J]. World Geology，2000，19(4)：370–374.(in Chinese))
[2] 殷坤龙. 降雨对滑坡的作用机制及动态模拟研究[J]. 地质科技情报，2002，21(1)：75–78.(YIN Kunlong. Mechanism and dynamic simulation of landslide by precipitation[J]. Geological Science and Technology Information，2002，21(1)：75–78.(in Chinese))
[3] 刘广润. 论滑坡分类[J]. 工程地质学报，2002，10(4)：339–340.(LIU Guangrun. Discussion on classification of landslides[J]. Journal of Engineering Geology，2002，10(4)：339–340.(in Chinese))
[4] 姚海林. 考虑裂隙及雨水入渗影响的膨胀土边坡稳定性分析[J]. 岩土工程学报，2001，23(5)：606–609.(YAO Hailin. Analysis on the slope stability of expansive soils considering cracks and infiltration of rain[J]. Chinese Journal of Geotechnical Engineering，2001，23(5)：606–609.(in Chinese))
[5] 杨诗义，雷学文. 弱化改进后的灰色预测模型研究[J]. 山西建筑，2010，36(3)：1–3.(YANG Shiyi，LEI Xuewen. Research on the gray forecasting model after weakening improvement[J]. Shanxi Architecture，2010，36(3)：1–3.(in Chinese))
[6] 张 珍，李世海，马 力. 重庆地区滑坡与降雨关系的概率分析[J].岩石力学与工程学报，2005，24(17)：3 185–3 191.(ZHANG Zhen，LI Shihai. MA Li. Probability analysis of relationship between landslide and rainfall in Chongqing area[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(17)：3 185–3 191.(in Chinese))
[7] 王建锋. 两类经典滑坡发生时间预报模型的理论分析[J]. 地质力学学报，2004，10(1)：40–50.(WANG Jianfeng. Theoretical analysis to two classic landslide prediction models：Saito?s model and Voight?s model[J]. Journal of Geomechanics，2004，10(1)：40–50.(in Chinese))
[8] 卢应发，周盛沛，罗先启，等. 渗流对抗滑桩加固滑坡后的影响效果评价[J]. 岩石力学与工程学报，2007，26(9)：1 840–1 846.(LU Yingfa，ZHOU Shengpei，LUO Xianqi，et al. Evaluation of effects of seepage on landslide reinforced by anti-sliding piles[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(9)：1 840–1 846. (in Chinese))
[9] 卢应发，杨丽平，华国辉. 一种新的节理本构模型及几种新的滑坡稳定系数计算方法[J]. 岩石力学与工程学报，2013，32(12)：2 431–2 438.(LU Yingfa，YANG Liping，HUA Guohui. A new joint constitutive model and a few new methods of stability coefficient calculation of landslides[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(12)：2 431–2 438.(in Chinese))
[10] 卢应发，邓国栋，杨丽平，等. 滑坡的关键块力学行为及力传递特征和不同应力状态的稳定系数研究[J]. 岩石力学与工程学报，2014，33(5)：884–891.(LU Yingfa，DENG Guodong，YANG Liping，et al. Study of mechanical behaviors of key block and characteristics of force transmit and stability coefficient of different state stresses of landslides[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(5)：884–891.(in Chinese))
[11] LU Y F. Deformation and failure mechanism of slope in three dimensions[J]. Journal of Rock Mechanics and Geotechnical Engineering，2015，7(2)：109–119.
[12] 卢应发，石峻峰，刘德富. 一种边坡稳定性计算的滑面边界法[P]. 中国：ZL 2014100250810，2014–04–16.(LU Yingfa，SHI Junfeng，LIU Defu. Method of stability analysis by boundary condition of sliding plane for the landslide[P]. China：ZL 2014100250810，2014– 04–16.(in Chinese))
[13] 卢应发，刘德富，石峻峰. 基于牵引式斜坡变形破坏机制的稳定性分析和预测预警方法[P]. 中国：ZL 201410025081.2，2014–07–23.(LU Yingfa，SHI Junfeng，LIU Defu. Method of stability analysis and prediction based on the deformation mechanism of Pull-type Landslide[P]. China：ZL 201410025081.2，2014–07–23.(in Chinese))
[14] 卢应发，路 韬，周建军，等. 一种新的节理模型及其在基桩分析中的应用[J]. 岩土力学，2013，34(4)：967–973. (LU Yingfa，LU Tao，ZHOU Jianjun et al. A new joint constitutive model and its application to pile foundation analysis[J]. Rock and Soil Mechanics，2013，34(4)：967–973.(in Chinese)) |
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2016, Vol. 35 
