Numerical simulation of wave-induced dynamic response of saturated silt seabed

Owing to the difference in sedimentary environment and substance source, soil strata within the depth range of 10 m vary significantly in strata sequence, size distribution and physical-mechanical properties in different areas of the Yellow River Delta. This leads to great difference in characteristics of dynamic responses under wave loading, and hence different characteristics of the evolution and failure of soil bodies. Key factors of soil evolution can be revealed by comprehensively analyzing the differences of dynamic responses of soil. In this paper, on the basis of Biot´s Consolidation Theory, with the stagger-grid high-order finite difference method, five typical sedimentary sequences of silty seabed of Chendao Sea area were taken as models to numerically simulate and analyze the variation of stress field, displacement field and excess pore water pressure in non-uniform layered seabed. Comparisons between analytical results and actually measured field results show that sedimentary sequence plays the key role in the stability of the seabed, and the stratum with a structure hard in the upper part and soft in the lower part is the most unstable.