發(fā)布時間：2018-11-08 10:46

【摘要】：本文所做的研究的目的如下：確定不同膨脹土的力學特征試驗的使用范圍和選用標準,以及研究膨脹土中的水、膨脹量和約束力之間的一些關系。所涉及到的研究工作主要分成兩部分：膨脹土的力學特征的室內(nèi)試驗,以及關于以上試驗的顆粒流數(shù)值模擬。 首先介紹了含水率和膨脹率關系的試驗,研究了含水率變化同膨脹應變之間的關系,結果表明這是一種線性關系。其次使用四種方法對于膨脹土試樣的總體應力應變關系進行研究。結果表明,膨脹土應變同應力的對數(shù)之間是一種線性關系；但不同的加載方式所獲得的關系是不同的,造成這種結果的原因是內(nèi)部結構的調(diào)整和水的作用；通過對不同力學特征試驗的應用范圍和優(yōu)缺點的對比分析,本文最終提出不同應用條件下膨脹性試驗的選用原則。 本文所進行的顆粒流數(shù)值模擬研究,其目的在于實現(xiàn)試驗所不能達到的邊界條件,以拓展對膨脹土力學特性的認識。但由于本文并沒有在機理研究方面有比較深入的突破,而顆粒流程序的應用卻需要對微觀機理有很清楚的了解。本文只是做了一些基本嘗試。本文建立了一種直剪試驗模型,通過調(diào)整單元參數(shù),使得總體的參數(shù)同室內(nèi)試驗結果相近。在此基礎上,通過調(diào)整顆粒膨脹量,建立了單元膨脹率同模型總體膨脹率的關系。對以上模型施加本文第3章介紹的膨脹土力學特征試驗邊界和荷載,模擬這些試驗的力學過程,獲得了可以同室內(nèi)試驗相類比的結果。
[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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU443

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