Experimental study on resilience behaviour of coarse grained soils

A number of unloading and reloading triaxial CD tests on two kinds of coarse grained soils with 4 types of grain distribution are performed. The differences of behaviour of strength and stress-strain between the test results from monotonic loading CD tests and unloading-reloading CD tests are analyzed. The value of resilience modulus for different soils is investigated, and the relationships among the modulus of resilience, the initial Young’s modulus, the confining pressure and the stress level are analyzed. It is found that the confining pressure influences the modulus of resilient evidently, and the effect of stress level on it is not so strong. The modulus of resilient of coarse grained soil is about 2.5~5.0 times the initial Young’s modulus, and is much greater than that of 1.5~3.0 times which is known for clays. The present findings provide an important support for the determination of the modulus of resilienes for Duncan-Chang model or other elasto-plastic models.