膨胀土含水率与力学特征的相互关系研究
发布时间：2018-11-08 10:46
【摘要】：本文所做的研究的目的如下：确定不同膨胀土的力学特征试验的使用范围和选用标准,以及研究膨胀土中的水、膨胀量和约束力之间的一些关系。所涉及到的研究工作主要分成两部分：膨胀土的力学特征的室内试验,以及关于以上试验的颗粒流数值模拟。 首先介绍了含水率和膨胀率关系的试验,研究了含水率变化同膨胀应变之间的关系,结果表明这是一种线性关系。其次使用四种方法对于膨胀土试样的总体应力应变关系进行研究。结果表明,膨胀土应变同应力的对数之间是一种线性关系；但不同的加载方式所获得的关系是不同的,造成这种结果的原因是内部结构的调整和水的作用；通过对不同力学特征试验的应用范围和优缺点的对比分析,本文最终提出不同应用条件下膨胀性试验的选用原则。 本文所进行的颗粒流数值模拟研究,其目的在于实现试验所不能达到的边界条件,以拓展对膨胀土力学特性的认识。但由于本文并没有在机理研究方面有比较深入的突破,而颗粒流程序的应用却需要对微观机理有很清楚的了解。本文只是做了一些基本尝试。本文建立了一种直剪试验模型,通过调整单元参数,使得总体的参数同室内试验结果相近。在此基础上,通过调整颗粒膨胀量,建立了单元膨胀率同模型总体膨胀率的关系。对以上模型施加本文第3章介绍的膨胀土力学特征试验边界和荷载,模拟这些试验的力学过程,获得了可以同室内试验相类比的结果。
[Abstract]:The purpose of this paper is as follows: to determine the scope of use and selection criteria of different expansive soil mechanical characteristics tests, and to study some relations between water, swelling quantity and binding force in expansive soil. The research work involved is mainly divided into two parts: the laboratory test of the mechanical characteristics of expansive soil and the numerical simulation of the particle flow about the above tests. The relation between water content and expansion rate is introduced, and the relationship between water content change and expansion strain is studied. The results show that the relationship is linear. Secondly, four methods are used to study the total stress-strain relationship of expansive soil samples. The results show that there is a linear relationship between strain and logarithm of stress in expansive soil, but the relationship obtained by different loading modes is different, which is caused by the adjustment of internal structure and the action of water. Through the comparative analysis of the scope of application and the advantages and disadvantages of different mechanical characteristic tests, this paper finally puts forward the selection principle of expansion test under different application conditions. The numerical simulation of particle flow in this paper aims at realizing the boundary conditions which can not be achieved in the experiment so as to expand the understanding of the mechanical properties of expansive soil. However, since there is no breakthrough in mechanism research in this paper, the application of particle flow program needs to have a clear understanding of the microscopic mechanism. This article has just made some basic attempts. In this paper, a direct shear test model is established. By adjusting the parameters of the unit, the overall parameters are similar to the results of the laboratory tests. On this basis, the relationship between the unit expansion rate and the overall expansion rate of the model is established by adjusting the particle expansion amount. The test boundary and load of expansive soil mechanical characteristics described in chapter 3 of this paper are applied to the above models, and the mechanical processes of these tests are simulated, and the results can be compared with those of laboratory tests.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU443
本文编号：2318231
[Abstract]:The purpose of this paper is as follows: to determine the scope of use and selection criteria of different expansive soil mechanical characteristics tests, and to study some relations between water, swelling quantity and binding force in expansive soil. The research work involved is mainly divided into two parts: the laboratory test of the mechanical characteristics of expansive soil and the numerical simulation of the particle flow about the above tests. The relation between water content and expansion rate is introduced, and the relationship between water content change and expansion strain is studied. The results show that the relationship is linear. Secondly, four methods are used to study the total stress-strain relationship of expansive soil samples. The results show that there is a linear relationship between strain and logarithm of stress in expansive soil, but the relationship obtained by different loading modes is different, which is caused by the adjustment of internal structure and the action of water. Through the comparative analysis of the scope of application and the advantages and disadvantages of different mechanical characteristic tests, this paper finally puts forward the selection principle of expansion test under different application conditions. The numerical simulation of particle flow in this paper aims at realizing the boundary conditions which can not be achieved in the experiment so as to expand the understanding of the mechanical properties of expansive soil. However, since there is no breakthrough in mechanism research in this paper, the application of particle flow program needs to have a clear understanding of the microscopic mechanism. This article has just made some basic attempts. In this paper, a direct shear test model is established. By adjusting the parameters of the unit, the overall parameters are similar to the results of the laboratory tests. On this basis, the relationship between the unit expansion rate and the overall expansion rate of the model is established by adjusting the particle expansion amount. The test boundary and load of expansive soil mechanical characteristics described in chapter 3 of this paper are applied to the above models, and the mechanical processes of these tests are simulated, and the results can be compared with those of laboratory tests.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU443
【参考文献】
相关期刊论文 前5条
1 栾茂田,漒橖惠三;关于岩土工程研究中若干基本力学问题的思考[J];大连理工大学学报;1999年02期
2 周健,池永;土的工程力学性质的颗粒流模拟[J];固体力学学报;2004年04期
3 雷华阳;土的本构模型研究现状及发展趋势[J];世界地质;2000年03期
4 郑立宁;谢强;柳堰龙;赵文;;基于颗粒流的膨胀土路基破坏特征分析[J];铁道工程学报;2011年03期
5 周健,廖雄华,池永,徐建平;土的室内平面应变试验的颗粒流模拟[J];同济大学学报(自然科学版);2002年09期
相关会议论文 前1条
1 孙钧;李成江;;复合膨胀渗水围岩——支护系统的流变机理及其粘弹塑性效应[A];第一届全国岩石力学数值计算及模型试验讨论会论文集[C];1986年
相关博士学位论文 前3条
1 吴礼舟;非饱和膨胀土的本构模型及在边坡稳定性评价中的应用[D];成都理工大学;2006年
2 曾远;土体破坏细观机理及颗粒流数值模拟[D];同济大学;2006年
3 贾景超;膨胀土膨胀机理及细观膨胀模型研究[D];大连理工大学;2010年
相关硕士学位论文 前1条
1 吴云刚;南水北调中线工程膨胀土膨胀本构模型试验研究[D];中国地质大学;2011年
，本文编号：2318231
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