基于变形条件的黄土结构性试验研究

EXPERIMENTAL STUDY OF LOESS STRUCTURAL PROPERTIES BASED ON SOIL DEFORMATION

黄土的结构性由黄土颗粒之间的联结结构强度和摩擦结构强度所决定,要定量描述黄土的结构性,就要定量研究黄土联结结构强度和摩擦结构强度的变化规律。为此,提出基于变形条件的黄土结构性参数即联结结构变形势参数mp1、摩擦结构变形势参数mp2及结构变形势参数mp,并通过黄土的侧限压缩试验研究原状黄土和人工水泥结构性黄土的结构性及其结构性参数的变化规律,揭示含水率、压力、密度、水泥含量等对黄土结构性的影响,并对所提出的基于变形条件的黄土结构性参数的合理性进行讨论。

The mechanical properties of soil are affected by its structure,which is the intrinsic determinant of its strength and deformation.Loess is a kind of typical structural soil.Its special structure is an important reason for the occurrence of brittle fracture and collapse.The structural properties of loess is determined by link structural strength and friction structural strength;and the variation of link structural strength and friction structural strength of loess should be quantitatively studied to quantitatively describe the structural properties of loess.Therefore,some new and reasonable structural parameters of loess are proposed based on soil deformation,such as the link structural deformation potential parameter m p1,the friction structural deformation potential parameter m p2 and the structural deformation potential parameter mp.The variation of the structural properties and the structural parameters of loess is studied through the confined compression tests of intact loess and man-made cement structural loess;and the effect of the moisture,pressure,density and cement content on the loess structural properties is revealed.Finally,the rationality of these structural parameters based on soil deformation is discussed.