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膨胀土边坡变形和稳定的离心模型试验研究(王国利)

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@mZ)`Ai']hX5r0【作者】王国利 【导师】陈生水
$}t*nAS9E_y#{H0【作者基本信息】南京水利科学研究院,岩土工程,2005年,硕士水利论文Hd E#_ ~6d9C yf

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【中文摘要】 本文首先扼要介绍了膨胀土的工程性质和研究现状,然后选用广西和新疆两个实际工程的膨胀土,开展了一系列的离心模型试验,研究了初始含水量、干密度、坡度、过水情况以及干湿循环对膨胀土边坡变形和稳定的影响,得出了以下主要结论: 膨胀土边坡的初始含水量愈低、干密度愈高、坡度愈缓,其稳定性愈高。其中含水量的变化对边坡变形和稳定性状影响最大,而干密度和坡度对边坡变形和稳定性状的影响则相对较小。初始含水量高的软膨胀土边坡也会产生类似于软粘土的深层圆弧滑动。新开挖或新填筑的膨胀土边坡初始状态下稳定性很高,短期的过水对边坡的变形和稳定影响不大,但水位消退后边坡的水位线以下部分将产生裂缝,进一步的干湿循环将导致裂缝变宽变深,使得水份更容易入渗,引起更大范围内膨胀土吸水软化,变形增大,强度降低,最终导致由坡脚开始的浅表层逐级牵引式破坏,“水”是导致膨胀土边坡变形和失稳的最主要因素,干湿循环引起的膨胀土边坡稳定安全系数的降低在前两次循环特别明显,第三次干湿循环后趋缓。膨胀土边坡失稳的防治应围绕边坡表层的防水、隔水和排水这一核心进行。离心模型试验与现场试验、室内常规试验以及理论分析相比,有明显而又突出的优点,是研究...更多膨胀土边坡的变形和稳定的有效手段。  还原

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【英文摘要】 In this paper, the engineering properties and study progress of expansive soil are introduced at first, and a series of geotechnical centrifuge model tests were carried out to study the influence of water content, dry density, slope gradient, overpass of water and circulations of drying and wetting on the deformation and stability of expansive soil slope. Conclusions were drawn as fellows:Expansive soil slopes with low water content, high dry density and gentle gradient will be more stable, and water content seems to be much more important. Failure with deep round sliding face can also happen when the slope soil has high water content and low dry density. In fact, most expansive soil slopes are very stable originally, and the action of a certain water level in a short time will not influence the stability of the slope very much, but their stability will reduce with the influence of circulations of drying and wetting. The main reason of this is that cracks will take place during the dry...更多ing process of expansive soil and water can infiltrate into the deeper part of the slope during the wetting process. Cracks will widen and deepen and water will influence more part of the slope with the increase of circulation and this will lead to the decrease of strength and the increase of the deformation, eventually result in the failure of the slope. The first two circulations will greatly reduce the stability of the slope, and water is the most important factor for the stability of the slope. In order to prevent the failure of expansive soil slope, much attention should be paid to the waterproof and drainage of the toe of the slope because failure often starts from this part of the slope. Geotechnical centrifuge model test technical has a lot of advantages compared to prototype observation, indoors test and theoretic analysis, and it is a effective means to study the deformation and stability of expansive soil slope.  还原水利论文DBA _*uf"b z!_~

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【中文关键词】 膨胀土; 边坡变形和稳定; 离心模型试验; 干湿循环; 裂缝; 水份入渗
F$TK*l6I\7A%yK5auB0【英文关键词】 expansive soil; deformation and stability of slope; centrifuge model test; circulation of drying and wetting; crack; infiltration
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TAG: 边坡 膨胀土 试验 王国利 离心模型
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