膨胀土边坡抗滑桩支护的机理和数值分析

发布时间：2018-05-01 06:01

  本文选题：膨胀土 + 抗滑桩　； 参考：《长沙理工大学》2014年硕士论文

【摘要】：目前,常用的抗滑桩的设计方法是基于边坡极限平衡理论和桩基础设计理论。对于膨胀土边坡,膨胀力的发生必然会对抗滑桩的力学作用机制产生影响,进而影响到其设计施工,并可能是影响边坡加固效果和边坡安全的重要因素。本文针对典型工程,进行了膨胀土基本力学参数的室内试验和数值模拟分析：1、通过查阅相关的文献资料并结合基本力学参数试验获得了膨胀土的基本力学参数。并根据设计资料和相关图纸,建立了力学分析的工程实际几何模型。2、采用三维有限差分法软件对典型位置进行了模拟。分析了不同桩型、不同桩间距的抗滑桩的支护机理,得到了抗滑桩在膨胀力作用下对渠道边坡的支护机理。3、采用二维有限元法对典型剖面进行了模拟。分析了抗滑桩的合理桩长、合理桩位、支护坡体的受力规律和对膨胀土的支护效果,探讨了膨胀土边坡抗滑桩的支护机理。通过研究分析获得的主要结论如下：1、通过对坡体安全系数计算结果分析,本实际工程膨胀土渠道边坡在无膨胀力作用时是稳定的,但是只要膨胀力发生作用,坡体就容易产生破坏。2、桩型的选择：桩间距越小D=1m圆形桩的支护能力就越优于D=0.75m矩形桩,反之则矩形桩支护能力强。桩位的选择：普遍最佳桩位在坡体1/2处。在桩长的选择：桩越长安全系数越高,设计应该结合考虑安全要求和经济效益。3、考虑膨胀力作用时,抗滑桩一般只能控制到桩身1/2以上的浅层膨胀力,但是抗滑桩的桩径越大、桩长越长,其支护控制就范围越深,同时单桩只能控制一定范围内的膨胀土作用,所以对膨胀土边坡选择多排小桩径抗滑桩支护的效果好。
[Abstract]:At present, the commonly used design method of anti-slide pile is based on slope limit equilibrium theory and pile foundation design theory. For expansive soil slope, the occurrence of expansive force will inevitably affect the mechanical mechanism of the sliding pile, and then affect the design and construction of the slope, and may be an important factor affecting the slope reinforcement effect and slope safety. In this paper, the laboratory test and numerical simulation analysis of the basic mechanical parameters of expansive soil have been carried out for typical projects. The basic mechanical parameters of expansive soil have been obtained by consulting relevant documents and combining with the test of basic mechanical parameters. According to the design data and related drawings, the engineering actual geometric model of mechanical analysis is established. The typical position is simulated by using 3D finite difference method software. The supporting mechanism of anti-slide pile with different pile types and different pile spacing is analyzed, and the supporting mechanism of anti-slide pile on canal slope under the action of expansion force is obtained. The typical section is simulated by two-dimensional finite element method. In this paper, the reasonable pile length, the reasonable pile position, the force law of supporting slope protection body and the supporting effect of expansive soil are analyzed, and the supporting mechanism of anti-slide pile in expansive soil slope is discussed. The main conclusions obtained from the research and analysis are as follows: 1. By analyzing the calculation results of the slope safety factor, it is found that the expansive soil channel slope in this practical project is stable when it has no expansive force, but as long as the expansion force takes effect, The selection of pile type: the smaller the pile spacing, the better the supporting capacity of circular pile is better than that of D0. 75m rectangular pile, otherwise, the support ability of rectangular pile is stronger. Selection of pile position: generally the best pile position is 1 / 2 of the slope. In the selection of pile length: the longer the pile is, the higher the safety coefficient is, and the design should consider safety requirements and economic benefits. When considering the effect of expansion force, the anti-slide pile can only control the shallow expansion force of the pile body more than 1 / 2, but the pile diameter of anti-slide pile is larger. The longer the pile length, the deeper the support control range is, and at the same time, the single pile can only control the role of expansive soil in a certain range, so it is good to select multiple rows of small pile diameter anti-slide pile to support expansive soil slope.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU443
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本文编号：1828024