本文關(guān)鍵詞：降雨入滲對(duì)軟土岸坡穩(wěn)定性影響研究　出處：《水運(yùn)工程》2014年04期 　論文類型：期刊論文

  更多相關(guān)文章： 軟土 岸坡穩(wěn)定 降雨入滲 有限元 強(qiáng)度折減法

【摘要】：軟土普遍具有含水率高、抗剪強(qiáng)度低的特點(diǎn),且大多數(shù)的土體滑坡都發(fā)生在降雨期間或者降雨之后的某個(gè)時(shí)間,因此研究降雨入滲誘發(fā)軟土岸坡失穩(wěn)的機(jī)理具有十分重要的意義。選取某軟土岸坡工程作為研究對(duì)象,基于有限元強(qiáng)度折減法,采用Abaqus軟件建立三維軟土岸坡有限元模型,分析降雨強(qiáng)度、時(shí)間以及飽和滲透系數(shù)對(duì)岸坡穩(wěn)定的影響。結(jié)果表明:隨著雨水的入滲,岸坡土體飽和度及孔隙水壓力增大,土體淺層基質(zhì)吸力減小或消失,導(dǎo)致土體抗剪強(qiáng)度降低,從而引起岸坡穩(wěn)定性降低;降雨入滲誘發(fā)岸坡失穩(wěn)的模式表現(xiàn)為漸近牽引式破壞,其塑性破壞區(qū)域最先出現(xiàn)在坡腳,并沿坡面向上發(fā)展,逐漸形成連續(xù)的塑性貫通滑動(dòng)面;以及持續(xù)的強(qiáng)降雨最容易引發(fā)岸坡的失穩(wěn)破壞。
[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.
【作者單位】： 交通運(yùn)輸部天津水運(yùn)工程科學(xué)研究所港口水工建筑技術(shù)國(guó)家工程實(shí)驗(yàn)室;長(zhǎng)沙理工大學(xué);
【基金】：國(guó)家新技術(shù)研究發(fā)展計(jì)劃(863)(2012AA112508)
【分類號(hào)】：U652.2
【正文快照】： 近年來,隨著港口工程建設(shè)數(shù)量與規(guī)模的與日俱增,越來越多的碼頭工程為了能獲得良好的水深條件,經(jīng)常需要修筑在圍海造陸的軟土地基上。但是由于軟土普遍具有含水率高、抗剪強(qiáng)度低、承載力低的特點(diǎn),因此軟土岸坡穩(wěn)定性問題一直是研究的熱門課題。降雨入滲是岸坡失穩(wěn)的主要誘發(fā)因

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