Study on dynamic response and property changes of soft ground mainly consisting of clay and silts under wave loading

进行了一系列不同底泥和波浪条件下的波浪加载试验，研究了加载引起的表层裂缝与加载后泥浆性质变化及泥浆流变特性之间的关系。提出了一种预测波浪荷载作用下底芽稳定性（裂缝发生）的分析方法。分析结果表明，海底表层的含水量应在液限的1.5-2.0倍之间，这与实际海底的含水量观测值吻合较好。结果表明，用循环粘度计测得的屈服应力计算的安全系数可视为不排水强度，能较好地反映波浪载荷试验中所观察到的泥浆的实际特性。泥浆的屈服应力与泥浆的液限和十字板抗剪强度密切相关。

A series of wave loading test with different conditions of bottom mud and waves were carried out and the relationship among the cracks made atthe surface by loading, the property changes of mud after loading and the rheology characteristics of mud were investigated. An analysis method to predict the stability of bottom bud (the occurrence of crack) subjected wave loading was proposed. The result of the analyses showed that the water content at the surface of seabed should be 1.5-2.0 times the liquid limit, which agreed well with the observed water contents at actual seabed. It is found that the safety factor calculated by the analyses using a yield stress obtained by cyclic viscometer can be considered as undrained strength showed the actual behavior of muds observed in the wave loading tests fairly well. The yield stress of mud has a close relationship with the liquid limit and a vane shear strength of the mud.