Dynamic properties of saturated remolded loess
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Abstract:
Static and dynamic experiments on saturated remolded samples were performed to study the static and dynamic properties of saturated remolded loess. Analyze the stress-strain curves of saturated remolded loess in the static tests. Based on the results of dynamic triaxial experiments, the relationships among the axial strain, dynamic shear strength, effective stress paths, hysteresis loops and the number of loading cycles were studied. The results show that the axial strain increase gradually with the number of cycles.,and the axial strain curve variation have an inflexion point, under the lower confining pressure, the axial strain increase gently at the beginning then increase suddenly up to the failure of the samples,under the higher confining pressure,the axial strain has a rapid increase at the outset and then the growth of the axial strain becomes slower.at last the axial strain increase sharply again. The effective stress paths move to left gradually with the increase of cycles, and the degrees of movement increase gradually. The effective stress paths of each loading cycle consist of a closed area, and the region increased gradually. With the increase of loading cycles, both the area and inclination of hysteresis loops increase gradually. Through the results from the dynamic elastic modulus tests of saturated remolded loess, 1/Ed increase gradually with the axial strain under the different confining pressure and determine the values of a,b and Edmax from the relationship between 1/Ed and εa. The damping ratio λ increase with the axial strain εa and reach to a stable value. Based on the results the proposed values of λ under the different confining pressures are determined, providing a reference for the engineering practice.
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