本文選題：降雨 + 非飽和土�。� 參考：《成都理工大學(xué)》2013年碩士論文

【摘要】：非飽和土由多相介質(zhì)組成，物理力學(xué)性質(zhì)非常復(fù)雜，其理論至今不夠完善和成熟。降雨誘發(fā)的非飽和土斜坡滲流、變形及穩(wěn)定性問題是巖土工程界一直以來研究的重要課題，特別是雨水入滲與土體骨架變形耦合問題是近年來研究的熱點。從流-固耦合的角度研究非飽和土體的滲流和變形，對理論研究和工程應(yīng)用具有重要意義。 以西南某地區(qū)松散堆積土為研究對象，通過壓力板儀和非飽和土三軸儀開展試驗研究，分析了非飽和土的土-水特征和變形特征，并采用有限元軟件FlexPDE進行計算，研究了降雨入滲條件下非飽和土坡的滲流-變形耦合效應(yīng)。具體研究內(nèi)容和主要研究成果包括以下幾點： （1）采用壓力板儀進行了土體的脫水試驗及一維固結(jié)試驗，，獲得了不同初始孔隙比、不同級配、不同應(yīng)力狀態(tài)下土-水特征曲線(Soil-Water CharacteristicCurve, SWCC)，不同應(yīng)力狀態(tài)下基質(zhì)吸力-應(yīng)變關(guān)系曲線，以及不同吸力狀態(tài)下的應(yīng)力-應(yīng)變關(guān)系曲線，并且分析和探討了土-水特征曲線及變形曲線變化規(guī)律。 （2）采用GDS三軸儀進行非飽和土三軸壓縮試驗，獲得了不同應(yīng)力路徑下的應(yīng)力-應(yīng)變關(guān)系曲線，并初步分析了非飽和粉質(zhì)砂土在三維應(yīng)力狀態(tài)下的剪切變形規(guī)律。 （3）根據(jù)達西定律、質(zhì)量守恒定律及SWCC模型，逐步推導(dǎo)出了非飽和土滲流控制方程；引入有限元軟件FlexPDE，編程求解非飽和土滲流控制方程，并分析和探討非耦合情況下SWCC參數(shù)、降雨持時、降雨強度以及非飽和滲透系數(shù)的各向異性等對非飽和土斜坡滲流場分布的影響。 （4）根據(jù)滲流理論、彈性理論及SWCC模型，建立非飽和土流-固耦合控制方程，將降雨過程作為邊界條件，并賦以初始值，采用FlexPDE軟件編程求解流-固耦合模型，并分析和探討降雨持時、降雨強度、非飽和滲透系數(shù)的各向異性以及與基質(zhì)吸力相關(guān)的土體體積模量等對非飽和土斜坡流-固耦合的影響。
[Abstract]:Unsaturated soil is composed of multiphase medium, and its physical and mechanical properties are very complex. The theory of unsaturated soil is not perfect and mature. The seepage, deformation and stability of unsaturated soil slope induced by rainfall have been an important research topic in geotechnical engineering field, especially the coupling of Rain Water infiltration and soil skeleton deformation is a hot topic in recent years. The study of seepage and deformation of unsaturated soil from the point of view of fluid-solid coupling is of great significance for theoretical research and engineering application. In this paper, the soil-water characteristics and deformation characteristics of unsaturated soils are analyzed by means of pressure plate and unsaturated soil triaxial analysis, and the finite element software FlexPDE is used to calculate them. The coupling effect of seepage and deformation on unsaturated soil slope under rainfall infiltration is studied. The concrete research contents and main research results are as follows: (1) the dewatering test and one-dimensional consolidation test of soil are carried out with pressure plate instrument, and different initial void ratios and different gradation are obtained. Soil-Water characteristic Curve, SWCCO, matrix suction strain relationship curves under different stress states, and stress-strain relationship curves under different suction states. The characteristic curves of soil-water and deformation curves are analyzed and discussed. (2) the stress-strain curves of unsaturated soils under different stress paths are obtained by using GDS triaxial test. The shear deformation of unsaturated silty sand under three dimensional stress is analyzed preliminarily. (3) according to Darcy's law, mass conservation law and SWCC model, the governing equation of unsaturated soil seepage is deduced step by step. The finite element software FlexPDE is introduced to solve the governing equation of unsaturated soil seepage, and the parameters of SWCC are analyzed and discussed under the condition of non-coupling. The influence of rainfall intensity and anisotropy of unsaturated permeability coefficient on the seepage field distribution of unsaturated soil slope. (4) based on seepage theory, elastic theory and SWCC model, the fluid-solid coupling governing equation of unsaturated soil is established. Taking the rainfall process as the boundary condition and assigning the initial value, the fluid-solid coupling model is solved by FlexPDE software, and the rainfall intensity when rainfall is sustained is analyzed and discussed. The effects of anisotropy of unsaturated permeability coefficient and bulk modulus of soil related to matrix suction on fluid-solid coupling of unsaturated soil slope.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU41

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