剪胀性土质边坡体系稳定性的分析与评价
发布时间：2019-01-17 10:13
【摘要】：多数土体或多或少具有一定的剪胀性,但剪胀性却对土的受力、变形以及稳定性具有明显的影响,需要在实际工程中合理应用和评价。或出于简单或出于保守的目的,目前在土质边坡的稳定分析中经常把非零剪胀角取为0°(即采用非关联流动法则,且不考虑土体的剪胀性)。通常的看法是把非零剪胀角取为0°得到的结果是偏于保守的。例如,在土质边坡稳定分析中把剪胀角取为0°所得到的安全系数通常最小。从安全系数角度来评价边坡的稳定性,尽管具有重要意义,但并不全面,所得到的结果也未必可靠。本文主要针对土质边坡体系,从安全系数,土的受力变形行为,抗滑桩和挡土结构的受力方面综合分析土质边坡的稳定性,力求获得更加全面、可靠的结论。 本文的主要研究内容有：(1)研究了剪胀角对边坡安全系数的影响。目前关于剪胀角对边坡安全系数的影响有两种看法：一种是剪胀角越大安全系数越大；另一种是安全系数随剪胀角增大呈现先增大后减小的抛物线样式。本文首先对此问题进行论证,分析了之所以出现这两种说法的原因,同时指出了强度折减法在边坡稳定分析中还存在局限性。(2)采用有限元软件ABAQUS分析了剪胀角对分层边坡安全系数的影响。(3)采用ABAQUS软件建立了三维抗滑桩加固边坡、挡土墙加固边坡以及桩墙联合加固边坡有限元模型。具体分析了剪胀角对边坡安全系数、抗滑桩变形、抗滑桩受力,挡土墙受力的影响。分析总结了把非零剪胀角取为0°的各种情况的合理性。 本文的主要创新点为： (1)对目前关于剪胀角对土质边坡安全系数影响的两种看法进行评判,并指出强度折减法在边坡稳定分析中的局限性。 (2)不仅考虑了剪胀角对土质边坡安全系数的影响,还研究了剪胀角对抗滑桩、挡土墙受力的影响,全面分析了剪胀角对土质边坡体系稳定性的影响。 本文的研究目的是为工程人员在边坡的数值模拟中提供参考,也就是应该重视剪胀角对土质边坡体系稳定性的影响。
[Abstract]:Most soils have more or less shear dilatancy, but the shear dilatancy has obvious influence on the stress, deformation and stability of the soil, which needs to be applied and evaluated reasonably in practical engineering. Or for the sake of simplicity or conservatism, the non-zero shear expansion angle is often taken as 0 掳in the stability analysis of soil slope at present (that is to say, the non-correlated flow rule is adopted, and the shear dilatancy of soil is not taken into account). The general view is that the results obtained when the non-zero shear expansion angle is taken to be 0 掳are conservative. For example, in the stability analysis of soil slope, the safety factor is usually the minimum when the shear expansion angle is taken as 0 掳. The evaluation of slope stability from the angle of safety factor is of great significance, but it is not comprehensive, and the results obtained are not reliable. In this paper, the stability of soil slope is analyzed comprehensively from the aspects of safety factor, deformation behavior of soil, anti-slide pile and retaining structure, in order to obtain a more comprehensive and reliable conclusion. The main contents of this paper are as follows: (1) the influence of shear expansion angle on slope safety factor is studied. At present, there are two views on the influence of the expansion angle on the slope safety factor: one is that the greater the expansion angle is, the greater the safety factor is, the other is that the safety factor increases first and then decreases with the increase of the expansion angle. This paper first demonstrates this problem and analyzes the reasons why these two statements appear. At the same time, the limitation of strength reduction method in slope stability analysis is pointed out. (2) the influence of shear expansion angle on safety factor of layered slope is analyzed by using finite element software ABAQUS. (3) Three-dimensional anti-slide pile is used to reinforce slope. Finite element model of retaining wall reinforced slope and pile wall combined reinforcement slope. The influence of shear expansion angle on slope safety factor, anti-slide pile deformation, anti-slide pile force and retaining wall force is analyzed in detail. The rationality of taking the non-zero expansion angle as 0 掳is analyzed and summarized. The main innovations of this paper are as follows: (1) two opinions on the influence of shear expansion angle on the safety factor of soil slope are evaluated, and the limitation of strength reduction method in slope stability analysis is pointed out. (2) not only the influence of the expansion angle on the safety factor of the soil slope is considered, but also the influence of the shear expansion angle on the stability of the soil slope system is studied. The purpose of this paper is to provide a reference for engineers in the numerical simulation of slope, that is, the influence of shear expansion angle on the stability of soil slope system should be paid attention to.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43
本文编号：2409950
[Abstract]:Most soils have more or less shear dilatancy, but the shear dilatancy has obvious influence on the stress, deformation and stability of the soil, which needs to be applied and evaluated reasonably in practical engineering. Or for the sake of simplicity or conservatism, the non-zero shear expansion angle is often taken as 0 掳in the stability analysis of soil slope at present (that is to say, the non-correlated flow rule is adopted, and the shear dilatancy of soil is not taken into account). The general view is that the results obtained when the non-zero shear expansion angle is taken to be 0 掳are conservative. For example, in the stability analysis of soil slope, the safety factor is usually the minimum when the shear expansion angle is taken as 0 掳. The evaluation of slope stability from the angle of safety factor is of great significance, but it is not comprehensive, and the results obtained are not reliable. In this paper, the stability of soil slope is analyzed comprehensively from the aspects of safety factor, deformation behavior of soil, anti-slide pile and retaining structure, in order to obtain a more comprehensive and reliable conclusion. The main contents of this paper are as follows: (1) the influence of shear expansion angle on slope safety factor is studied. At present, there are two views on the influence of the expansion angle on the slope safety factor: one is that the greater the expansion angle is, the greater the safety factor is, the other is that the safety factor increases first and then decreases with the increase of the expansion angle. This paper first demonstrates this problem and analyzes the reasons why these two statements appear. At the same time, the limitation of strength reduction method in slope stability analysis is pointed out. (2) the influence of shear expansion angle on safety factor of layered slope is analyzed by using finite element software ABAQUS. (3) Three-dimensional anti-slide pile is used to reinforce slope. Finite element model of retaining wall reinforced slope and pile wall combined reinforcement slope. The influence of shear expansion angle on slope safety factor, anti-slide pile deformation, anti-slide pile force and retaining wall force is analyzed in detail. The rationality of taking the non-zero expansion angle as 0 掳is analyzed and summarized. The main innovations of this paper are as follows: (1) two opinions on the influence of shear expansion angle on the safety factor of soil slope are evaluated, and the limitation of strength reduction method in slope stability analysis is pointed out. (2) not only the influence of the expansion angle on the safety factor of the soil slope is considered, but also the influence of the shear expansion angle on the stability of the soil slope system is studied. The purpose of this paper is to provide a reference for engineers in the numerical simulation of slope, that is, the influence of shear expansion angle on the stability of soil slope system should be paid attention to.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43
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