降雨入渗对软土岸坡稳定性影响研究

发布时间：2018-01-17 21:32

本文关键词：降雨入渗对软土岸坡稳定性影响研究　出处：《水运工程》2014年04期 　论文类型：期刊论文

【摘要】：软土普遍具有含水率高、抗剪强度低的特点,且大多数的土体滑坡都发生在降雨期间或者降雨之后的某个时间,因此研究降雨入渗诱发软土岸坡失稳的机理具有十分重要的意义。选取某软土岸坡工程作为研究对象,基于有限元强度折减法,采用Abaqus软件建立三维软土岸坡有限元模型,分析降雨强度、时间以及饱和渗透系数对岸坡稳定的影响。结果表明:随着雨水的入渗,岸坡土体饱和度及孔隙水压力增大,土体浅层基质吸力减小或消失,导致土体抗剪强度降低,从而引起岸坡稳定性降低;降雨入渗诱发岸坡失稳的模式表现为渐近牵引式破坏,其塑性破坏区域最先出现在坡脚,并沿坡面向上发展,逐渐形成连续的塑性贯通滑动面;以及持续的强降雨最容易引发岸坡的失稳破坏。
[Abstract]:Soft soil generally has the characteristics of high moisture content and low shear strength, and most of the landslides occur during or after rainfall. Therefore, it is of great significance to study the mechanism of slope instability induced by rainfall infiltration. A soft soil slope engineering is selected as the research object, based on the finite element strength reduction method. Three-dimensional finite element model of soft soil bank slope was established by Abaqus software. The effects of rainfall intensity, time and saturation permeability coefficient on slope stability were analyzed. The results show that: with the infiltration of Rain Water. With the increase of soil saturation and pore water pressure, the suction of shallow matrix decreases or disappears, which results in the decrease of shear strength of soil and the decrease of slope stability. The model of slope instability induced by rainfall infiltration is asymptotic traction failure, and the plastic failure region first appears at the foot of the slope, and develops up the slope surface, gradually forming a continuous plastic through slip surface. And continuous heavy rainfall is the most likely to cause slope instability damage.
【作者单位】：交通运输部天津水运工程科学研究所港口水工建筑技术国家工程实验室;长沙理工大学;
【基金】：国家新技术研究发展计划(863)(2012AA112508)
【分类号】：U652.2
【正文快照】： 近年来,随着港口工程建设数量与规模的与日俱增,越来越多的码头工程为了能获得良好的水深条件,经常需要修筑在围海造陆的软土地基上。但是由于软土普遍具有含水率高、抗剪强度低、承载力低的特点,因此软土岸坡稳定性问题一直是研究的热门课题。降雨入渗是岸坡失稳的主要诱发因

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