【作者】 张泽坤；

【导师】 左德元；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 膨胀土边坡失稳是膨胀土地区一种最常见的斜坡变形现象,产生的病害对工程建设有着巨大的危害和影响,膨胀土边坡的稳定性分析和整治是岩土工程界最为棘手的问题之一。本文以牧马山膨胀土滑坡为例,采用非线性有限元法,考虑膨胀力等因素的作用。通过计算坡体的应力与应变,分析边坡变形过程和潜在滑动面。h型抗滑桩能够有效地抑止膨胀土边坡裂隙的扩展和发展,阻止边坡体的变形。自上个世纪70年代首创并应用,从80年代末90年代初,人们认识到地基与基础的相互作用以来,在抗滑桩的设计理论和方法研究中开始注意桩土相互作用的分析和研究,但对h型抗滑桩的研究远不如单桩成熟。为了研究沉埋式h型抗滑桩在膨胀土边坡加固过程中的受力情况以便取得合理的抗滑桩结构组合尺寸,采用了大型有限元软件ANSYS分析h型抗滑桩加固膨胀土边坡。数值分析及结果表明,沉埋式h型抗滑桩在不同的尺寸参数取值下抗滑桩受力和变形有很大的不同,所以在滑坡治理中要采取不同的抗滑桩尺寸设计参数,为工程和设计优化提供参考。有限元法的突出优点是适于处理非线性、非均质和复杂边界等问题,应用于本工程的优点在于可以考虑地层特性,局部变形对边坡稳定性的影响,桩、土体的接触效应。本学位论文研究成果对“本工程”有指导意义,对相关工程有参考和借鉴作用。更多还原

【Abstract】 Expansive soil slope failure is the most common phenomenon of soil slope’s deformation in expansive soil area, and its malady will do great harm to engineering. The analysis of expansive soil slope failure is one of the most difficulty problems in geotechnical engineering. This paper takes the engineering of Muma hill expansive soil landside for example, which adopted nonlinear finite element method and considered such factors as expansive force. Slope deformation process and latent slide face are analyzed by calculating the stress and strain of the slope.H-type anti-slide pile is a way to reinforce the slope of expansive soil, which can effectively restrain crack’s expansion and development, as well as stop slope’s deformation. h-type anti-slide pile is designed and applied in the 1970s. Since the late 1980s and the early 1990s when people realized the interaction between the foundation and the soil, the design theory and method of anti-slide pile have begun to emphasize on analyzing and studying the effect of the pile and the soil. But the study of the h-type anti-slide pile is less mature than that of the single type anti-slide pile.The finite element software ANSYS is used to analyze the reinforcement of slope of expansive soil and research the force state of sunken h-type slide-resistant pile in the process of reinforcement of slope of expansive soil, so as to get reasonable slide-resistant structure combination dimension. The numerical analysis and results show that force states of slide-resistant piles are greatly different under different dimension parameter. Therefore, different anti-slide pile dimension parameter should be adopted under slope renovations to provide references for projects and design optimization.The merit of finite element method is that it is fit for dealing with nonlinear finite element, non-homogeneous and complicated boundary problems, which can consider stratum characteristics, effects of local deformation on slope stability and the contact effect of pile and soil. The research results of this thesis have guiding significance on "this project" and provide references for other relevant projects.更多还原