The Shear Strength Characteristics of Red Clay

Abstract

The paper is aimed at the phenomenon of red clay subgrade disease,taking the subgrade f illing from the Yuqing-Kaili Expressway as the research object,the soil mechanics as the theoretical f oundation,the testing technology of geotechnical engineering as the method,resrearched the change regulation of the strength characteristics of red clay。The research findings not only has the important academic value for improving the evaluation system of red clay road,but also has some engineering practical significance to the highway construction in the red clay area,Besides this,it can provide technology reference for other industries. Foreword The red clay has high moisture content, high plasticity, high void ratio and other special engineering properties,and there is more rain in South China,during the drying and wetting cycle, the long-term strength and stability of red clay subgrade descend, caused the subgrade to have some disease,as subgrade settlement,pavement crack,transverse crack,shoulder collapse,slope sliding,collapse and landslide.So it is has great important meaning to research the strength characteristics of red clay. Basic physical properties of Red clay Field Sampling.The red clay used in this experiment is from Yuq ing-Kaili Expressway。Thsee red clay's colors are brown red, brown red and brown yellow.The soil taking form subgrade is a little dry, and uniform, these soil's structure is compact; The soil taking form cutting slope is a little damp and loose,the amount of pieces of leaves and plant root tip in these soil is very little.Form the analysis of the particle compositicle,finding the soil sample is mianly clay.The natural water content is high, the viscosity property is strong,the void ratio is big,the liquid limit is a little higher and in the soft plastic state. Basic physical properties of Red clay Table1 Basic physical properties of red clay JTG E40-2007 >0.075mm(%) 0.074~0.002mm(%) <0.002mm (%)