本文選題：碎石土滑坡 + 降雨入滲　； 參考：《成都理工大學(xué)》2014年碩士論文

【摘要】：滑坡是一種嚴(yán)重的巖土體失穩(wěn)現(xiàn)象。在所發(fā)生的各類滑坡中，碎石土滑坡是主要的滑坡類型之一，一般由坡積、殘積、沖積和崩塌堆積等形成的結(jié)構(gòu)松散的堆積體滑坡。降雨入滲是非飽和碎石土邊坡失穩(wěn)的主要誘發(fā)因素。碎石土滑坡的變形破壞是一個動態(tài)變化過程，由于滑體結(jié)構(gòu)的復(fù)雜性及土體組成物質(zhì)的特殊性，對其進(jìn)行針對性的分析是必要的。 本文針對降雨條件下碎石土邊坡穩(wěn)定性問題，運(yùn)用飽和-非飽和滲流理論，分析不同降雨條件下土坡內(nèi)滲流場的變化，利用非飽和土抗剪強(qiáng)度理論，結(jié)合計(jì)算出來的瞬態(tài)滲流場，對碎石土邊坡的瞬態(tài)穩(wěn)定性進(jìn)行分析。 本文研究的主要內(nèi)容及成果包括： 1．基于非飽和碎石土特性及降雨條件下的飽和-非飽和滲流基本理論，分析降雨入滲的影響因素。采用室內(nèi)試驗(yàn)和二維有限元方法，進(jìn)行邊坡的降雨入滲分析。 土-水特征曲線（SWCC）是分析非飽和土的強(qiáng)度和變形特性的關(guān)鍵。本文利用壓力板儀，進(jìn)行了三種不同級配土樣的脫水過程的土-水特征曲線試驗(yàn)。試驗(yàn)結(jié)果表明，級配對土-水特征曲線的陡緩變化趨勢影響顯著，顆粒粗、級配差的土體土-水特征曲線較陡。 在室內(nèi)進(jìn)行降雨型滑坡的物理模擬試驗(yàn)，根據(jù)預(yù)先埋設(shè)的體積含水率傳感器，測得不同降雨強(qiáng)度下，坡體內(nèi)不同深度的含水率變化情況。根據(jù)實(shí)驗(yàn)結(jié)果，探討了不同降雨強(qiáng)度及同一降雨強(qiáng)度不同深度范圍內(nèi)體積含水率的變化規(guī)律。 運(yùn)用VADOSE/W軟件，建立了降雨型邊坡穩(wěn)定性的滲流有限元分析模型，給出了降雨入滲有限元分析的實(shí)施步驟。結(jié)合算例，探討了降雨強(qiáng)度、降雨持時、前期降雨、滲透系數(shù)和各向異性對滲流場的影響。 2．滲流場與應(yīng)力場是相互影響的，滲流場改變土體的力學(xué)性質(zhì)，土體應(yīng)力作用直接影響著滲透系數(shù)。從滲流-應(yīng)力耦合理論出發(fā)，闡述了滲流-應(yīng)力耦合基本方程，建立非飽和邊坡的滲流-應(yīng)力耦合模型。結(jié)合算例，，采用有限元方法計(jì)算了降雨強(qiáng)度、降雨持時、前期降雨、滲透系數(shù)和各向異性對滲流場的影響，并將其結(jié)果與非耦合計(jì)算結(jié)果進(jìn)行對比分析。 3．介紹了降雨入滲對邊坡穩(wěn)定性影響的機(jī)理及降雨入滲條件下邊坡穩(wěn)定性分析方法。運(yùn)用ABAQUS有限元軟件計(jì)算在滲流-應(yīng)力耦合計(jì)算中所得到的暫態(tài)孔隙水壓力分布，用于土坡穩(wěn)定性分析，得出相應(yīng)情況下土坡穩(wěn)定系數(shù)的變化規(guī)律。
[Abstract]:Landslide is a serious rock and soil instability phenomenon. Among all kinds of landslides, macadam landslide is one of the main landslide types, which is usually composed of slope product, residual product, alluvium and collapse accumulation. Rainfall infiltration is the main inducing factor of unsaturated gravel slope instability. The deformation and failure of macadam landslide is a dynamic change process. Due to the complexity of sliding body structure and the particularity of soil composition, it is necessary to analyze it pertinently. Aiming at the stability of gravel slope under rainfall condition, this paper analyzes the variation of seepage field in soil slope under different rainfall conditions by using saturated-unsaturated seepage theory, and applies the theory of shear strength of unsaturated soil to analyze the variation of seepage field in slope under different rainfall conditions. Combined with the calculated transient seepage field, the transient stability of gravel slope is analyzed. The main contents and achievements of this paper are as follows: 1. Based on the characteristic of unsaturated gravel soil and the basic theory of saturated-unsaturated seepage under rainfall condition, the influencing factors of rainfall infiltration are analyzed. The rainfall infiltration analysis of slope is carried out by using indoor test and two-dimensional finite element method. Soil-water characteristic curve (SWCC) is the key to analyze the strength and deformation characteristics of unsaturated soil. In this paper, the soil-water characteristic curves of the dehydration process of three different gradation soil samples have been tested by using a pressure plate instrument. The results show that the gradation has a significant effect on the steepness of soil-water characteristic curve, and the soil-water characteristic curve with coarse particles and different gradation is steeper. The physical simulation test of rainfall landslide was carried out in the laboratory. According to the volume water content sensor embedded in advance, the variation of water content in different depth of slope was measured under different rainfall intensity. Based on the experimental results, the variation of volume water content in the range of different rainfall intensity and the same rainfall intensity and different depth is discussed. Using VADOSE/W software, the seepage finite element analysis model of rainfall slope stability is established, and the implementing steps of rainfall infiltration finite element analysis are given. The effects of rainfall intensity, rainfall duration, early rainfall, permeability coefficient and anisotropy on seepage field are discussed. 2. The seepage field and stress field affect each other. The seepage field changes the mechanical properties of the soil, and the stress of the soil directly affects the permeability coefficient. Based on the theory of seepage and stress coupling, the basic equation of seepage stress coupling is expounded, and the seepage stress coupling model of unsaturated slope is established. The effects of rainfall intensity, rainfall duration, early rainfall, permeability coefficient and anisotropy on seepage field are calculated by using finite element method, and the results are compared with those of uncoupled calculation. 3. The influence mechanism of rainfall infiltration on slope stability and the analysis method of slope stability under rainfall infiltration are introduced. The transient pore water pressure distribution obtained by using ABAQUS finite element software in the seepage stress coupling calculation is used to analyze the stability of the soil slope and the variation law of the stability coefficient of the soil slope under the corresponding conditions is obtained.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU43;P642.22

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張培文,劉德富,宋玉普;多孔介質(zhì)上淺水流動的數(shù)學(xué)模型[J];長江科學(xué)院院報(bào);2003年03期

2 楊為民;吳樹仁;張永雙;石菊松;向靈芝;;降雨誘發(fā)坡面型泥石流形成機(jī)理[J];地學(xué)前緣;2007年06期

3 林孝松;滑坡與降雨研究[J];地質(zhì)災(zāi)害與環(huán)境保護(hù);2001年03期

4 尚岳全,周建鋒,童文德;含碎塊石土質(zhì)邊坡的穩(wěn)定性問題[J];地質(zhì)災(zāi)害與環(huán)境保護(hù);2002年01期

5 黃潤秋,戚國慶;非飽和滲流基質(zhì)吸力對邊坡穩(wěn)定性的影響[J];工程地質(zhì)學(xué)報(bào);2002年04期

6 謝守益，張年學(xué)，許兵;長江三峽庫區(qū)典型滑坡降雨誘發(fā)的概率分析[J];工程地質(zhì)學(xué)報(bào);1995年02期

7 孟暉，胡海濤;我國主要人類工程活動引起的滑坡、崩塌和泥石流災(zāi)害[J];工程地質(zhì)學(xué)報(bào);1996年04期

8 雍莉;溝后水庫修復(fù)工程混凝土面板堆砂礫石壩墊層及層間關(guān)系滲透穩(wěn)定試驗(yàn)研究[J];甘肅水利水電技術(shù);2003年02期

9 吳禮舟;黃潤秋;;非飽和土滲流-變形耦合的數(shù)值分析[J];土木建筑與環(huán)境工程;2011年03期

10 呂衡;太平驛水電站閘基覆蓋層滲透及滲透變形試驗(yàn)研究[J];水電站設(shè)計(jì);1995年03期

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