晋西超固结黄土与正常固结黄土力学分析

Analysis of Mechanical Properties of Overconsolidated Loess and Normally Consolidated Loess in Western Shanxi

超固结黄土和正常固结黄土是工程中常见的两种类型土,不同固结类型的黄土其力学性能存在着明显的差异,而且黄土相比于其他类型的土来说具有明显的结构性。因此对晋西吕梁地区的超固结黄土与正常固结黄土进行原位取样,采用室内试验探究两种固结类型黄土的天然密度、含水率、压缩模量和剪切强度。研究表明超固结黄土与正常固结黄土的力学特性差异较大,通过直剪试验可知前期固结压力主要影响的是黄土的内摩擦角而非黏聚力。

Overconsolidated loess and normally consolidated loess are two types of soil commonly used in engineering. The mechanical properties of loess with different consolidation types are significantly different,and loess has obvious structural properties compared to other types of soil. Therefore,the over-consolidated loess and normalconsolidated loess in the Luliang area of Jinxi were sampled in situ,and the natural density,water content,compressive modulus and shear strength of the two consolidation types of loess were investigated by laboratory tests. The study shows that the mechanical properties of overconsolidated loess and normal consolidated loess are quite different. It can be seen from the direct shear test that the pre-consolidation pressure mainly affects the internal friction angle of loess rather than cohesion.