波浪荷载作用下非均等固结饱和粉土孔压特性研究

Characteristics of Pore Water Pressure of Anisotropic Consolidation Saturated Silt under Wave Loading

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。

Cyclic triaxial-torsional coupling shear tests were performed by hollow cylinder apparatus under anisotropic consolidation to study the development of pore water pressure in the saturated silt under wave loading.It was found that the relationship between pore water pressure ratio and generalized shear strain of saturated silts under anisotropic consolidation well fits the hyperbolic curve,while pore pressure ratio and vibration cycle ratio can be fitted by the use of power function.According to the Mohr-Coulomb law under ultimate state,the method to calculate limit pore water pressure of less viscous silt was proposed;Comparison between the calculation results and the test results showed that there is a linear relationship between pore pressure ratio and consolidation ratio for both of the calculation results and the test values.In addition,the smaller the Kc is,the less difference exists between calculation results and test values.