澜沧江深层倾倒体演化过程及失稳机制研究

doi:10.13722/j.cnki.jrme.2020.1071

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摘要为研究澜沧江流域某深层倾倒体演化过程及失稳机制，采用底摩擦模型试验及通用离散单元程序数值试验模拟其在河谷演化进程及水库蓄水作用下的变形失稳全过程，通过数字图像相关法(DIC)及粒子图像测速法(PIV)获取斜坡不同阶段的速度、位移矢量场及特征点的位移变化规律。结果表明：(1) 深层倾倒体变形失稳模式为加速变形–减速蠕变–坡脚牵引–整体滑移，滑坡是倾倒变形发展到极致的产物；(2) 受河谷演化控制，深层倾倒体主要经历剪切错动、初始弯曲、自稳蠕变、统一剪切面形成和破坏5个演化阶段；(3) 水库蓄水加速了涉水深层倾倒体从蠕变阶段向累进破坏阶段过渡的演化进程，建议做好坡脚防渗处理工作；(4) 深层倾倒体诱发滑坡主要发育于强倾倒区，下挫陡坎的形成是倾倒体演化逐渐进入累进性破坏阶段的重要标志。

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	宁奕冰1
	唐辉明1
	2
	张勃成1
	丁柄栋1
	申培武1
	夏丁1
	陈鸿杰3

关键词 ：岩石力学, 深层倾倒体, 河流下切, 演化过程, 底摩擦试验, 失稳机制, 水库蓄水, 通用离散单元程序

Abstract：To study the evolution process and failure mechanism of a deep-seated toppling slope in the upper reaches of the Lancang River，base friction physical model test and universal distinct element code(UDEC) numerical simulation are carried out to simulate the instability process of a deep-seated toppling slope under the influence of valley evolution and reservoir impoundment. Displacement and velocity vector fields of the slope in different evolution stages and displacement variations of feature points are obtained by digital image correlation (DIC) and particle image velocimetry(PIV) methods. The test results show that the deep-seated toppling slope presents an accelerating deformation-decelerating creepage-traction by slope toe-integral sliding pattern，and landslide is the final outcome of toppling failure. Controlled by valley evolution，the deep-seated toppling failure experiences five stages including shear dislocation，initial bending，creep，formation of a throughgoing sliding plane and failure. Reservoir impoundment accelerates the evolution rate of toppling failure from the creep stage to the failure stage，and hence，it is suggested to adopt anti-seepage measures at the slope toe. Landslide induced by toppling mainly develops in highly toppled regions，and the formation of the scarps is an important sign for the evolution of toppling failure to enter the progressive failure stage.

Key words： rock mechanics deep-seated toppling failure river downcutting evolution process base friction test instability mechanism reservoir impoundment universal distinct element code(UDEC)

引用本文:

宁奕冰1，唐辉明1，2，张勃成1，丁柄栋1，申培武1，夏丁1，陈鸿杰3 . 澜沧江深层倾倒体演化过程及失稳机制研究[J]. 岩石力学与工程学报, 2021, 40(11): 2199-2213.
NING Yibing1，TANG Huiming1，2，ZHANG Bocheng1，DING Bingdong1，SHEN Peiwu1，XIA Ding1，CHEN Hongjie3. Evolution process and failure mechanism of a deep-seated toppling slope in the Lancang River Basin. , 2021, 40(11): 2199-2213.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1071 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I11/2199

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