【作者】 扈胜霞；

【导师】 张伯平； 陈正汉；

【作者基本信息】 西北农林科技大学 ， 水利水电工程， 2002， 硕士

【摘要】 湿陷性黄土的强度和变形问题是学术界和工程界长期关注的问题。由于黄土是一种典型的非饱和土，所以近年来不少学者用现代非饱和土的理论和方法研究黄土的有关问题。 本文主要研究基质吸力对原状黄土强度、变形和水分变化的影响及其应用。用新研制的国内第一台非饱和土固结仪、国内第一台非饱和土直剪仪和经过改进的非饱和土三轴仪，做了4组16个非饱和土直剪试验；2组6个非饱和土固结试验；1组3个控制吸力的非饱和土三轴试验。得到了原状黄土的抗剪强度曲线、土-水特征曲线、压缩曲线及三轴应力应变曲线。分析了强度参数随吸力的变化规律和广义土-水特征曲线的合理性。根据试验所得参数，应用多种土质堤坝的转动平衡分析计算机程序(简称REAME程序)分析了黄土边坡的稳定性问题。研究表明：土坡稳定安全系数随吸力增大而增大，从而证明了吸力对黄土边坡的稳定性有重要影响。更多还原

【Abstract】 The strength and deformation of collapsible loess have been paid great attention by scholars and engineers in the world for a long time.. Since loess is a typical unsaturated soil, some of scholars have studyed some questiones of loess by the theorey and ways of modern unsaturated soil mechanics.The effect of matric suction on the strength and deformation as well as water content of intact loess are studied in this paper.Using the direct shear testing equipment and consolidation testing equipment and modified triaxial testing equipment in the University of Logistical Engineering in Chunqing. 4 groups ( 16 specimens) consolidated drained direct shear tests and 2 groups ( 6 specimens) consolidated tests as well as 1 group ( 3 specimens) triaxial shear tests with controling matric suction were conducted. The shear strength curve and compressed curve and soil-water characteristic curve as well as triaxial stress-strain curve of intact loess were obtained. The variation rule of strength parameters associated with the matric suction were studied. The result show that the generalize soil-water characteristic curve proposed by Huanghai and Chenzhenghan is reasonable. Based on the parameters from the tests,the stability of a loess slope was analyzied by using the REAME(Rotation Equilibrium Analysis of Multiayered Embankments) program. The numerical analysis demonstrate that an safety factor of a loess slope increases with the matric suction. Therefore, matric suction has an impertinent effect on the stability of a loess slope.更多还原