Abstract:

Based on  triaxial tests, the stressstrain relationship and strength properties of reinforced expensive soils were studied to obtain the relation between the strength index of reinforced soil and that of  corresponding plain soil. The macro behavior of reinforced soil strength was analyzed. Combining the stressstrain relationship of reinforced  soil with different layers and equivalent surrounding pressure analysis principle, the strength properties of reinforcement soil were analyzed when the reinforced material broke. Mohr circles were tangent to the same line when the reinforced materials of one layer broke. With the increase of axial compression, many layers reinforced materials begin to break,  and the Mohr circles extended outward. It showed that the strength of reinforced soil increases with the increase of reinforced layers. The test showed  that strength envelope of different reinforce layers is approximately parallel and the increase of reinforced soil strength was caused by the increase of cohesion when the reinforced materials are flexible materials.

Key words:  triaxial test, reinforced expensive soils, fracture, flexible material