川东红层原状滑带土饱水软化试验研究

doi:10.13722/j.cnki.jrme.2014.1003

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摘要四川东部由紫红色砂泥岩构成的红层斜坡属于地质灾害多发易发区。斜坡内的软弱夹层(尤其是泥化夹层)容易遇水软化导致其力学强度降低，形成潜在滑动面。选取川东红层岩质滑坡原状滑带土进行室内饱水软化试验，揭示滑带土软化后微观结构和力学性质的变化规律。试验结果表明：滑带土饱水后内部结构变得疏松，颗粒间连接方式由面–面接触转化为面–边、边–边接触；黏聚力和内摩擦角随饱水浸泡时间呈指数衰减，直至浸泡10 d左右才逐渐趋于稳定。以试验获得的滑带土力学参数为基础，采用极限平衡法分析滑带土软化效应对研究区内斜坡稳定性的影响。计算结果表明，随着滑带土饱水时间的延长，斜坡稳定性系数不断降低，某些斜坡即使无后缘静水压力和底滑面扬压力的作用，斜坡也可能失稳破坏。由此认为，滑带土饱水软化后力学强度的大幅降低是导致红层地区某些岩质滑坡的重要因素。研究成果为认识四川红层地区滑坡机制和灾害防治提供了重要依据。

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	李江1
	2
	许强1
	胡泽铭2
	刘汉香1
	张群1
	卢远航1
	王森1

关键词 ：土力学, 原状滑带土, 微观结构, 力学性质, 饱水软化, 稳定性计算

Abstract：Consists of sandstone and mudstone，the red-bed slopes in the east of Sichuan province belong to high geological hazard-prone areas. The soft layer(especially muddy layer) in the slopes was prone to be softened by water with the reduce of its mechanical strength，which favors the development of potential sliding surface. With the aim of revealing the change law of microstructure and mechanical properties of samples，a series of experiments of the sampled undisturbed soil from landslide sliding zone under the saturated condition were carried out. The result shows that after saturating the internal structure of tested soil became loose，meanwhile the way of connection of soil particles changed from plane-plane to plane-edge，edge-edge. Both cohesion and internal friction angle variations follow an exponent curve and tend to be stable after soaking 10 days. According to this result，the softening effects on slope stability were analyzed by the limit equilibrium method. The calculation result shows that slope stability coefficient is reduced with the softening of soil of sliding surface. Some slopes may eventually tend to be unstable even though without the static water pressure from the rear crack of slope and uplift pressure from sliding surface. Therefore，the dramatical decrease of soil strength due to softening and saturating is considered as the important cause of slope failure in red bed regions. The research conclusion can provide an important basis to understand genetic mechanism of landslides and control hazards in Sichuan red bed area.

Key words： soil mechanics undisturbed slip soil microcosmic structure mechanical properties saturated softening stability calculation

引用本文:

李江1，2，许强1，胡泽铭2，刘汉香1，张群1，卢远航1，王森1. 川东红层原状滑带土饱水软化试验研究[J]. 岩石力学与工程学报, 2015, 34(S2): 4333-4342.
LI Jiang1，2，XU Qiang1，HU Zeming2，LIU Hangxiang1，ZHANG Qun1，LU Yuanhang1，WANG Sen1. EXPERIMENTAL RESEARCH ON SOFTENING OF UNDISTURBED SATURATED SLIP SOIL IN EASTERN OF SICHUAN PROVINCE RED BED. , 2015, 34(S2): 4333-4342.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1003 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/4333

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