EXPERIMENTAL STUDY ON SHEAR STRENGTH OF EXPANSIVE SOIL IMPROVED BY CEMENT

For the study of the rule of shear strength of expansive soil improved by cement,this paper takes the ridge level highway reconstruction project as the background,using YiChang three gorges brand cement modified expansive soil used as roadbed filler.With different dosage of cement improved expansive soil direct shear test was carried out.In-depth analysis of the different cement dosage of modified expansive soil shearing strength index of the influence and the influence law.The research results show that the cement improved expansive soil can significantly improve the shear strength of expansive soil,mixed with cement,internal friction angle and cohesive strength were significantly improved;With the increase of cement content,improved expansive soil angle of internal friction increases gradually,and the trend of increase fast after a slow first,and then gradually tend to be stable;With the increase of cement content,improved expansive soil cohesive force increases gradually,increasing trend to slow,quick first,then gradually slow down,when the cement content increases from 3% to 5%,the biggest increase cohesive force.