波浪循环荷载作用下饱和软黏土孔压发展模式

利用循环三轴试验对波浪循环荷载作用下饱和软黏土的孔压发展进行了研究,考虑了固结应力、循环应力幅值和循环周期等因素对孔压发展的影响。试验发现,在循环荷载初期,平均孔压的增长较迅速,而循环荷载的后期孔压增长较缓慢;循环应力幅值越大,固结应力越小及循环荷载周期越大,土体中的孔压越大。根据试验结果建立了拟合孔压与循环周数的数学关系式,并研究了不同试验条件对参数的影响。分析表明:循环应力幅值比越大,固结应力越小及参数u*max越大,固结应力对参数k、t的影响较小,参数k、t随着循环应力比值分别近似呈线性降低和线性增大的趋势;不同循环周期的参数u*max和t近似为常数,参数k随着循环周期的变化呈线性降低趋势。

Generation of Pore Pressure of Soft Clay under Ocean Wave Load

Generation of pore pressure of soft clay under wave load was studied through cyclic triaxial test.The effect of consolidation stress,cyclic stress ratio and cyclic period on it was investigated.Test results show that,in initial stage average pore pressure developed fast,in later stage pore pressure developed slowly,pore pressure developed larger with large cyclic stress ratio and cyclic period,but with small consolidation stress.A regression formula was established to fit experiment result;the effect of test condition on regression parameter was studied.Analytical result show that： with the larger of cyclic stress ratio and the smaller of consolidation stress,u＊max becomes large,consolidation stress has a small effect on k and t;k and t will linear decrease and increase with cyclic stress ratio;cyclic period have a minor effect on u＊max and t,k will decrease linear with cyclic period.