ABSTRACT

Zhao, Y.; Du, X.; Xiong, B., and Zhang, D., 2018. Experimental study on dynamic characteristics of marine soft clay in North China. In: Liu, Z.L. and Mi, C. (eds.), Advances in Sustainable Port and Ocean Engineering. Journal of Coastal Research, Special Issue No. 83, pp. 474–478. Coconut Creek (Florida), ISSN 0749-0208.

Marine soft clay is a modern sediment dominated by fine particles in the hydrostatic or slow flow. Because of its special dynamic characteristics, it has been widely applied in the construction of major projects such as highways, railways and airport runways. It greatly reduces the possibility of catastrophic deformation and instability caused by long term use and avoids huge economic losses. In the construction of engineering, it is urgent to analyze the dynamic characteristics of soft clay and solve the difficulties in the project. Based on the GDS vibration triaxial test, the dynamic characteristics of soft clay, namely dynamic modulus and damping ratio, are studied with marine soft clay produced by a practical engineering site in North China.The test results show that with the increase of cycle times, the dynamic modulus of soil gradually decreases, and the damping ratio increases, but the increase in amplitude is related to the level of cyclic stress. The increase of the cyclic stress level and the application of the initial deviatoric stress will accelerate the attenuation of the dynamic modulus, which leads to the increase of the damping ratio. In contrast to the dynamic modulus, the deviatoric stress has a more significant influence on the damping ratio.

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