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选用近海地区分布广泛的粉土作为研究对象,利用空心圆柱仪进行了模拟波浪荷载作用下的循环三轴-扭剪耦合试验,探寻非均等固结条件下饱和粉土孔隙水压力的发展特性。试验结果表明:非均等固结条件下,饱和粉土孔压比与广义剪应变之间的关系符合双曲线发展形式,孔压比与振次比之间的关系可以用幂函数来较好地拟合。根据极限状态的摩尔—库仑定律,推导了少粘性粉土孔隙水压力极限值计算方法,并将计算值与试验值进行了比较。孔压比和固结比的计算值与试验值之间均符合直线型关系,且固结比越小,计算值与试验值之间的差异越小。
The widely used silt in the offshore area was selected as the research object. The cyclic triaxial-torsional shear coupling test under simulated wave loads was carried out by hollow cylinder to explore the development characteristics of pore water pressure of saturated silt under unequal consolidation conditions. The experimental results show that under non-uniform consolidation conditions, the relationship between pore water pressure ratio and generalized shear strain is in accordance with hyperbolic development. The relationship between pore pressure ratio and vibration frequency ratio can be better expressed by power function Fitting. According to the Moore - Coulomb law of the limit state, the calculation method of the pore water pressure limit of the less - viscous silt is deduced and the calculated value is compared with the experimental value. The calculated values of pore pressure ratio and consolidation ratio are in line with the experimental values, and the smaller the consolidation ratio, the smaller the difference between the calculated value and the experimental value.