作　　者： ; ; ;

机构地区： 东北林业大学土木工程学院

出　　处： 《中国公路学报》 2006年第4期11-16,共6页

摘　　要： 通过对原状Q3黄土进行单轴压缩试验,分析了不同加载方向和浸水路径对湿陷性黄土变形特性的影响,讨论了湿陷性黄土变形的各向异性以及增(减)湿过程中变形与浸水路径的无关性。结果表明,黄土的湿陷变形与压缩变形的各向异性相当显著,而且按不同方向压缩的过程中,湿陷变形与压缩变形之间存在相互转化关系:竖向压缩时,土体的湿陷性最大,压缩性最小;沿45°方向压缩时,土体的湿陷性最小,压缩性最大;沿水平方向压缩时,其湿陷性和压缩性都介于前两者之间。按不同方向压缩时,试样浸水饱和后的压缩性基本相同,即饱和黄土的压缩变形是各向同性的。黄土的湿陷性和压缩性都与浸水路径无关,试样浸水后的压缩性与初始含水量无关,不同的浸水路径和加荷路径对浸水试样的压缩性没有影响。 The uniaxial compression test was carried out on undisturbed Qa loess, and the influence of different pressure directions and soak paths on the deformation characteristics of collapsible loess were analyzed. According to the test results, the anisotropy of collapsible loess deformation and the independence of deformation and soak paths during moistening or demoistening process were discussed. It indicates that the anisotropy of collapse deformation and loess compression deformation is particularly evident, moreover, in the course of compression in different pressure directions, a transformation relation exists between collapse deformation and compression deformation. When the loess is compressed in vertical direction, the collapsibility of loess is the largest but its compressibility is the smallest. The collapsibility of loess is the smallest but its compressibility is the largest while the loess is compressed in the direction of 45~. When the loess is compressed in horizontal direction, the collapsibility and compressibility of loess are between that of vertical direction and the direction of 45°The compressibility of loess samples after soaked and saturated is almost the same when the loess is compressed in different directions; compression deformation of saturated loess is isotropic. The collapsibility and compressibility of loess have no relation with soak paths. The compressibility of loess samples after soaked is independent of its initial moisture content. Different soak paths and pressure paths have no effect on the compressibility of soaked loess samples.

关 键 词： 道路工程 黄土 单轴压缩试验 湿陷变形 压缩变形 各向异性 浸水路径

领　　域： [交通运输工程]