中文摘要：

海床不稳定性的现象很多都是海底液化引起的。根据之前的研究,粉土在液化之后有效应力会依然存在,关于波浪作用下海床液化之后有效应力变化的研究很少。采用波浪水槽实验,在未液化和液化2种情况下,分别施加不同波高的波浪,对底床各层位土体孔隙水压力进行采集,并对比研究。实验结果表明,液化后有效应力的相对值相对于液化前有很明显的减小,并且在深度上表现出显著的差异性,这种差异性随着波高的增大而减小。当相同深度处同一种波高作用一定时间时,有效应力会出现极大值,然后有效应力会减小。

英文摘要：

Seabed instability is often caused by seabed liquefaction. According to previous studies, the effective stress will remain in the silty soil after liquefaction. However, there have been little studies on the effective stress for wave-induced liquefaction up to date. In this paper, the pore-water pres sures were measured for each depth in both cases of no liquefaction and liquefaction under different waves using the water flume as a tool and the results are compared and analyzed. The experiment re- sults show that the relative value of the effective stress obviously decreased in the liquefied soil compa- ring to the non-liquefied. The effective stress shows a significantly difference in depth, and the differ- ence decreases with the increase in wave height. There is a high effective stress after a certain time of liquefaction at the same depth and under the same wave, and then the effective stress decreases.