SIMULATION TEST STUDY ON LINEAR EXPANSIVE RATIO FOR DETERMINATION OF WEAK EXPANSIVE SOIL IN SUBGRADE

This paper studies the variety ways of loading that affect the linear expansive ratio of expansive soil. It simulates the load variety ways of subgrade to do the test of linear expansive ratio. The results show that the higher load and initial dry density can lead to higher linear expansive ratio. It compares the linear expansive ratio test results from specification and simulation under subgrade loading. The result shows that there is great difference in linear expansive ratios of specification and simulation under subgrade loading. With the decreasing of unload and initial dry initial, the variety of loading ways has the more effect on the linear expansive ratio. It indicates that it has some influence on linear expansive ratio which does not consider the load variety ways of actual engineering. It has some influence on deformation forecast of subgrade used expansive soil. It is needed to consider the effect of load variety ways on linear expansive ratio during its determination. It is suggested to combine the load variety ways into the test of linear expansive ratio.