超高路堑边坡治理工程案例研究I：边坡失稳机制模拟分析

doi:10.13722/j.cnki.jrme.2016.0658

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摘要概要介绍龙岩双永高速公路K227超高路堑边坡的地形地貌、地质条件、变形破坏过程及特征，结合边坡稳定度反分析思路、强度折减法和开挖有限元仿真技术对该边坡变形孕育过程进行模拟分析和定量评估。采用一种基于应力张量差值的增减变化及其变化量的正负分区来确定边坡开挖松弛区的数值方法，解释路堑高边坡开挖卸荷松弛的力学机理；模拟重现了挖方边坡经历稳定性缓慢上升的卸荷回弹阶段、稳定性线性下降的剪切破裂阶段和稳定性急剧下降的失稳破坏阶段的全过程中应力调整、塑性屈服、滑面孕育和变形破坏的演化规律和发展趋势，揭示了边坡由于快速工程开挖扰动，使潜在软弱带充分暴露，并切断坡脚力学支撑，伴随岩土卸荷松弛及强度弱化，产生坡顶岩土张裂变形、深层软弱带剪切蠕动和坡脚沿结构面临空剪出的失稳机制；间歇性降雨入渗的岩土增重及附加水压使滑坡表现出时滑时停的特征；边坡整体处于临界状态，在继续开挖或持续暴雨冲击条件下，可能导致稳定性骤降，从滑动阶段转化为剧滑阶段。最后，对应急抢险对策、治理方案规划及线路调整设想等问题进行讨论与反思，为边坡病害治理提供了理论依据。

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	王浩1
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	王晓东3
	泮俊3

关键词 ：边坡工程, 高边坡, 滑坡, 开挖松弛区, 反分析, 失稳机制

Abstract：In this paper，the topography，landscape and geological conditions, and deformation process and failure characteristics of the super-high cut slope K227 along the expressway from Yongchun to Yongding in City Longyan of China were described. Simulation and quantitative evaluation of the deformation development of the slope were conducted with the back analysis for slope stability，the strength reduction method and the finite element modelling of excavation. A method based on the differential data of stress tensor is proposed to determine the relaxation zone due to excavation and to explain better the mechanism of unloading relaxation due to the excavation of the high cut slope. The numerical simulation faithfully reproduced the process and trending of the stress adjustment，plastic yielding，development of slip surface and deformation at all stages of the slope failure. The slope stability mildly increased in the unloading rebound stage，linearly reduced in the shearing failure stage and abruptly reduced in the instability stage. The numerical results demonstrated that the disturbance due to the fast excavation led to the potential weak layer to be fully exposed and cut off the mechanical support at the toe of the slope. The unloading relaxation and the weakened strength of the rock and soils resulted in the tension crack at the top，the shearing creep of deep weak layer and the shearing along the joints at the toe of the slope. The intermittent rainfall which increased the weight of the rock and soils and the extra pore water pressure caused the slope to slide intermittently. The slope is close to the limit equilibrium state globally and the stability may be abruptly reduced if further excavation or strong rainfall happen. Finally，the discussions and reflections on the emergency and rescue strategy，the planning of slope disaster mitigation methods and route adjustment are also presented.

Key words： slop engineering high slope landslide excavation relaxing zone back analysis instability mechanism

引用本文:

王浩1，2，王晓东3，泮俊3. 超高路堑边坡治理工程案例研究I：边坡失稳机制模拟分析[J]. 岩石力学与工程学报, 2017, 36(4): 899-909.
WANG Hao1，2，WANG Xiaodong3，PAN Jun3. A case study of super-high cut slope I：simulation and analysis of instability mechanism of slopes. , 2017, 36(4): 899-909.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.0658 或 http://www.rockmech.org/CN/Y2017/V36/I4/899

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