波浪作用下粉土中的孔压响应及其在粉土海床稳定性评价中的应用

In-situ answering pore pressure under wave and its application to stability analysis of silty seabed

粉土在波浪等动荷载作用下极易发生液化破坏,而孔隙水压力在粉土动力学行为中扮演了一个很重要的角色,其发展变化会直接影响到土体的稳定性。因此,通过室内波浪作用下的粉土孔压响应模型试验探讨了孔压与波浪之间的响应情况,发现波浪能量的影响沿土层深度递减,水深条件相同时,响应的孔压随波高的增大而增加,当波浪作用足够长时间后粉土发生液化破坏,此时粉土内累积的孔压小于上覆土体的自重应力。根据结果提出了1种评价粉土海床稳定性的方法。

Silt is easy to liquefy under cyclic loading such as wave effect, and excess pore pressure plays an important role in dynamic behavior of silt soil and its change can affect seabed stability directly. The relation between excess pore pressure and wave in silty seabed is studied in this thesis by means of model experiment of answering pore pressure under wave. Besides, the thesis summed up two methods to estimate porepressure under wave and put forward a method to envalue the stability of silty seabed according to the result of the model experiment.