本文選題：非飽和土 + 土水特征曲線　； 參考：《揚(yáng)州大學(xué)》2014年碩士論文

【摘要】：土-水特征曲線(SWCC)是關(guān)于非飽和土的一個重要本構(gòu)關(guān)系,它表述了土中含水率與吸力之間的相互關(guān)系。非飽和土的很多基本特性,例如滲透性、持水系數(shù)、抗剪強(qiáng)度等都可以土-水特征曲線中推測得出,因此土水特征曲線對于研究非飽和土非常重要。本文以揚(yáng)州地區(qū)典型粉質(zhì)黏土和軟黏土為研究對象,利用GDS非飽和三軸儀,進(jìn)行土水特征曲線試驗(yàn)研究,并利用試驗(yàn)所得的土水特征曲線進(jìn)行降雨入滲條件下的邊坡穩(wěn)定性分析,主要內(nèi)容為： (1)對前人有關(guān)土水特征曲線研究成果進(jìn)行了總結(jié),總結(jié)了土水特征曲線試驗(yàn)方法、影響因素以及數(shù)學(xué)模型。 (2)利用GDS進(jìn)行土水特征曲線測量試驗(yàn),并比較分析了圍壓、干密度以及土質(zhì)對土水特征曲線規(guī)律的影響,結(jié)果表明：圍壓對土水特征曲線影響不大；干密度越大,進(jìn)氣值越大,脫水速率越�。煌馏w黏粒含量越大,進(jìn)氣值越大,脫水速率越小。 (3)采用Fredlund和Xing三參數(shù)數(shù)學(xué)模型對揚(yáng)州地區(qū)黏性土土水特征曲線進(jìn)行模擬,并給出相應(yīng)的參數(shù)范圍。 (4)基于室內(nèi)試驗(yàn)得到的土水特征曲線方程,對降雨入滲條件下?lián)P州地區(qū)黏性土邊坡進(jìn)行穩(wěn)定性分析,結(jié)果表明：由土水特征曲線可知,同等基質(zhì)吸力下,非飽和土體積含水率越大,滲透系數(shù)越大；一般情況下,土體進(jìn)氣值越大,同等基質(zhì)吸力下滲透系數(shù)越大,邊坡越穩(wěn)定；揚(yáng)州地區(qū)黏性土體遭遇特大暴雨時,降雨4天后邊坡安全系數(shù)下降30%-50%,滑動面位于邊坡表層。
[Abstract]:The soil-water characteristic curve (SWCC) is an important constitutive relation of unsaturated soil, which describes the relationship between soil moisture content and suction. Many basic properties of unsaturated soil, such as permeability, water-holding coefficient and shear strength, can be inferred from soil-water characteristic curve, so soil-water characteristic curve is very important to study unsaturated soil. In this paper, the typical silty clay and soft clay in Yangzhou area are taken as the research objects, and the characteristic curves of soil and water are tested by GDS unsaturated triaxial apparatus. The stability of slope under rainfall infiltration is analyzed by using the soil-water characteristic curve. The main contents are as follows: 1) the research results of soil and water characteristic curve are summarized. The test method, influencing factors and mathematical model of soil-water characteristic curve are summarized. (2) GDS is used to measure soil-water characteristic curve, and the effects of confining pressure, dry density and soil quality on soil-water characteristic curve are compared and analyzed. The results show that the confining pressure has little effect on the soil-water characteristic curve, the larger the dry density, the greater the inlet air value and the smaller the dehydration rate, the larger the clay content, the greater the inlet air value. The smaller the dehydration rate is, the smaller the dehydration rate is. The Fredlund and Xing three-parameter mathematical models are used to simulate the characteristic curves of clay soil and water in Yangzhou area, and the corresponding parameter ranges are given. The stability of clay soil slope in Yangzhou area under rainfall infiltration condition is analyzed. The results show that under the same matrix suction, the larger the volume moisture content of unsaturated soil is, the greater the permeability coefficient is. The larger the air intake value of the soil is, the greater the permeability coefficient is under the same matrix suction, and the more stable the slope is; when the viscous soil in Yangzhou region encounters heavy rain, the safety factor of the slope decreases by 30% -50% after 4 days of rainfall, and the sliding surface is located on the surface of the slope.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU41;TU442

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本文編號：2011038