黃土作為一類具有水敏性的特殊土在世界上有著廣泛的分布,其水敏性主要表現(xiàn)為含水率對(duì)變形、強(qiáng)度和本構(gòu)關(guān)系等物理力學(xué)特性的影響。其中,濕陷性問(wèn)題一直是黃土力學(xué)及工程中的研究熱點(diǎn)。黃土多分布于干旱和半干旱地區(qū),以非飽和狀態(tài)存在,因此對(duì)非飽和黃土變形特性的研究對(duì)于解決實(shí)際工程問(wèn)題具有重要意義。以甘肅省蘭州市七里河地區(qū)的非飽和濕陷性黃土為研究對(duì)象,通過(guò)試驗(yàn)測(cè)試和理論分析相結(jié)合的方法,研究了非飽和黃土的增濕變形特性。本文的主要研究?jī)?nèi)容如下:1、采用蘭州市七里河區(qū)的原狀非飽和黃土,通過(guò)室內(nèi)實(shí)驗(yàn)獲得了該黃土的基本物理力學(xué)參數(shù),主要包括天然含水率、液塑限、密度以及最大干密度和最優(yōu)含水率等。2、利用三聯(lián)式非飽和土直剪儀進(jìn)行直剪試驗(yàn),試驗(yàn)過(guò)程包括控制不同基質(zhì)吸力的非飽和土直剪試驗(yàn)和不同含水率的常規(guī)直剪試驗(yàn),得到試樣的強(qiáng)度參數(shù),再結(jié)合Lu基于吸應(yīng)力曲線的強(qiáng)度公式,繪制出吸應(yīng)力與有效飽和度之間的關(guān)系曲線。同利用壓力板儀試驗(yàn)得出吸應(yīng)力與有效飽和度之間的關(guān)系曲線與已有的三軸剪切試驗(yàn)得出的吸應(yīng)力特征曲線對(duì)比分析。發(fā)現(xiàn)通過(guò)直剪試驗(yàn)可以很好的描述土體吸應(yīng)力與有效飽和度之間的關(guān)系,各參數(shù)方便獲取,并且基于吸應(yīng)力曲線的強(qiáng)度公式... 

【文章來(lái)源】：蘭州理工大學(xué)甘肅省

【文章頁(yè)數(shù)】：99 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
ABSTRACT
摘要
CHAPTER1 INTRODUCTION
    1.1 Background
    1.2 Literature Review
        1.2.1 Effective Stress Principle
        1.2.2 Unsaturated Soil Constitutive Model
        1.2.3 Stress-Strain Types and Constitutive Models of Loess
        1.2.4 Research Status of Loess Moisturizing Deformation Test
    1.3 Research Purpose and Contents and Technical Route
        1.3.1 Research Purpose
        1.3.2 Research Contents
        1.3.3 Technical Route
CHAPTER2:SUCTION STRESS CHARACTERISTIC CURVE OF UNDISTURBED LOESS
    2.1 Interparticle Suction
    2.2 Test Scheme and Method
        2.2.1 Determination of Basic Physical Properties of Loess
        2.2.2 Soil-water Characteristic Test
        2.2.3 Direct Shear Test of Unsaturated Soil
            2.2.3.1 Test Instrument
            2.2.3.2 Test Procedure
            2.2.3.3 Test Principle and Scheme
            2.2.3.4 Analysis of Test Results
    2.3 Analysis of Shear Strength Based on Suction Stress
        2.3.1 Shear Strength Criterion Based on a Single Stress Variable
        2.3.2 Strength Criterion Based on Two Independent Stress Variables
        2.3.3 Shear Strength Based on Suction Stress
    2.4 Summary of This Chapter
CHAPTER3:LOGISTIC MODEL OF SOIL ISOTROPIC CONSOLIDATION CURVE
    3.1 Introduction
    3.2 Logistic Model for Isotropic Consolidation
        3.2.1 Model Establishment
        3.2.2 Model Parameter Determination
        3.2.3 Advance Consolidation Pressure
    3.3 Analysis and Discussion
    3.4 Conclusion
CHAPTER4:ONE-DIMENSIONAL MOISTURIZING CONSOLIDATION TEST OF UNDISTURBED LOESS
    4.1 Introduction
    4.2 Consolidation Test Scheme and Method
        4.2.1.Test Instrument
        4.2.2.Test Procedure
        4.2.3.Test Principle and Scheme
    4.3.Analysis of Lateral Compression Deformation of Unsaturated Undisturbed Loess
        4.3.1 Consolidation Tests under Different Hydraulic Action Paths
    4.4 One-Dimensional Moisturizing Deformation Constitutive Model
    4.5 Moisturizing Deformation Analysis
    4.6 Summary of this Chapter
CHAPTER5 CONCLUSIONS AND EXPECTATIONS
    5.1 Conclusions
    5.2 Expectations
References
Academic Conferences Attended
Acknowledgements


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