氯盐渍土抗拉强度特性的试验研究

以洛阳黄土为源土的室内配制氯盐渍土为研究对象,通过自制的单轴抗拉仪,进行了氯盐渍土抗拉特性试验,研究了干密度、初始含水率、含盐量对氯盐渍土抗拉强度的影响.试验结果表明,在相同含盐量和干密度下,抗拉强度与含水率呈对数关系;试样的抗拉强度随着干密度的增加而增加;在含水率小于15%时,破坏拉应力随着含盐量的增加,先减小后增大,拐点为8%;在含水率大于15%时,随着含盐量的增加,抗拉强度减小,而拉应变恰好相反;相同含盐量下,随着含水率的增加,破坏拉应力减小,破坏拉应变增大.

Experiment study of tensile strength characteristics of chlorine saline soil

To understand the tensile strength behavior of chlorine saline soil,the axial tensile test of chorine saline soil specimens were carried out,using chlorine soil of Luoyang loess disposed indoors as an object of study.The influence of dry density,initial water content,salt content on the tensile strength of chlorine saline soil were investigated.The test result indicated that the logarithmic relation between tensile stregth and water ratio under the same salt content and dry density are obtained;the tensile strength of samples increased with the increase of dry density;pulling stress decreased first and then increased with the increase of salt content when water content was less than 15%.The salt content of the inflexion was 8%.When the water content was more than 15%,the tensile strength decreased with the increase of salt content,while tension strain has an opposite changing law.With the increase of water content,the failure tensile stress decreased while the tension strain increased under the same salt content.