【摘要】：我國地形地質(zhì)條件復(fù)雜,邊坡失穩(wěn)現(xiàn)象頻頻發(fā)生。而降雨,尤其是強度大、持續(xù)時間長的暴雨、特大暴雨是影響邊坡穩(wěn)定性的重要因素,據(jù)統(tǒng)計,高達90%以上滑坡都與降雨相關(guān)。所以,研究降雨作用下邊坡的穩(wěn)定性,對邊坡失穩(wěn)機理研究和邊坡治理具有重要意義。 本文以貴州畢節(jié)至威寧高速公路K86+680-K86+980段高邊坡研究項目為依托,通過建立非飽和土體模型,得出土體強度隨含水量的增大而衰減的規(guī)律。利用ABAQUS建立有限元模型,分析了邊坡內(nèi)部滲流規(guī)律及邊坡穩(wěn)定性的影響因素,探求邊坡的失穩(wěn)機理。本文的主要成果如下： 1.建立土體的強度衰減模型,把土體強度參數(shù)粘聚力c和摩擦角(?)分別看作由兩部分組成,一部分與含水量無關(guān),另一部分與含水量相關(guān)。并與傳統(tǒng)非飽和土強度理論進行對比,證明其正確性。 2.分析了降雨過程中,邊坡內(nèi)部滲流規(guī)律,并進一步研究了降雨強度和降雨歷時對邊坡滲流的影響。結(jié)果表明：特定降雨歷時條件下,孔隙水壓力隨降雨強度的增大而非線性增大,滲流速度隨降雨強度增大而接近線性增大；特定降雨強度條件下,孔隙水壓力和滲流速度,隨著降雨歷時的增加都接近線性增大。 3.分別從邊坡巖性角度、力學角度及降雨的角度,對邊坡失穩(wěn)機理進行分析。 4.分別研究了粘聚力c和摩擦角(?),變形模量E和泊松比u,降雨強度,降雨持續(xù)時間,邊坡滲流系數(shù)等對邊坡的穩(wěn)定性影響,確定影響邊坡穩(wěn)定性的主要因素。
[Abstract]:The topographic and geological conditions in China are complex, and slope instability occurs frequently. The rainfall, especially the rainstorm with high intensity and long duration, is an important factor affecting slope stability. According to statistics, more than 90% landslides are related to rainfall. Therefore, the study of slope stability under rainfall is of great significance to the study of slope instability mechanism and slope control. Based on the research project of high slope in K86 680-K86 980 section of Bijie to Weining Expressway in Guizhou Province, the law of soil strength attenuation with the increase of water content is obtained by establishing unsaturated soil mass model. The finite element model is established by using ABAQUS to analyze the internal seepage law of slope and the influencing factors of slope stability, and to find out the mechanism of slope instability. The main results of this paper are as follows: 1. The strength attenuation model of soil is established, and the cohesive force c and friction angle of soil strength parameter c and friction angle (?) They are divided into two parts, one is independent of water content and the other is water content. Compared with the traditional unsaturated soil strength theory, it is proved to be correct. 2. In this paper, the internal seepage law of slope is analyzed, and the influence of rainfall intensity and rainfall duration on slope seepage is further studied. The results show that the pore water pressure increases linearly with the increase of rainfall intensity, and the percolation velocity increases linearly with the increase of rainfall intensity, while the pore water pressure and percolation velocity increase linearly with the increase of rainfall intensity. With the increase of rainfall duration, all of them are close to linear increase. 3. From the angle of slope lithology, mechanics and rainfall, the mechanism of slope instability is analyzed. 4. The effects of cohesion C and friction angle (?), deformation modulus E and Poisson's ratio u, rainfall intensity, rainfall duration, slope seepage coefficient on slope stability were studied, and the main factors affecting slope stability were determined.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.14

【參考文獻】

相關(guān)期刊論文 前10條

1 鄧清祿,王學平;斜坡深層巖石蠕變與黃土坡滑坡[J];長春科技大學學報;1999年01期

2 鄭穎人,趙尚毅;有限元強度折減法在土坡與巖坡中的應(yīng)用[J];巖石力學與工程學報;2004年19期

3 劉保健,謝永利,于友成;黃土非飽和入滲規(guī)律原位試驗研究[J];巖石力學與工程學報;2004年24期

4 黃潤秋;;20世紀以來中國的大型滑坡及其發(fā)生機制[J];巖石力學與工程學報;2007年03期

5 賈蒼琴;黃茂松;王貴和;;非飽和非穩(wěn)定滲流作用下土坡穩(wěn)定分析的強度折減有限元方法[J];巖石力學與工程學報;2007年06期

6 王純祥;蔣宇靜;謝謨文;江崎哲郎;;基于GIS區(qū)域邊坡失穩(wěn)災(zāi)害預(yù)測與評價[J];巖石力學與工程學報;2008年12期

7 林鴻州;于玉貞;李廣信;彭建兵;;降雨特性對土質(zhì)邊坡失穩(wěn)的影響[J];巖石力學與工程學報;2009年01期

8 楊光華;張玉成;張有祥;;變模量彈塑性強度折減法及其在邊坡穩(wěn)定分析中的應(yīng)用[J];巖石力學與工程學報;2009年07期

9 詹良通;管仁秋;陳云敏;劉釗;;某填埋場垃圾堆體邊坡失穩(wěn)過程監(jiān)測與反分析[J];巖石力學與工程學報;2010年08期

10 葉為民;張亞為;梅正君;陳寶;周秀漢;謝強;;漢十高速公路弱膨脹土非飽和滲透性試驗研究[J];巖石力學與工程學報;2010年S2期

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