CAJ | 학술논문

波浪荷载能引起海床土体的主应力轴连续旋转。不同于地震、交通等循环荷载，在周期性波浪荷载作用的土体应力路径方式下，软黏土的软化效用更为明显。本文分别对天然和扰动的海床土体在波浪荷载作用下的应力响应进行模拟，并分析应力路径的特点；为描述软化后的应力-应变关系，将软化效用和累积塑性应变的参数引入到能够反应土体动力非线性的 Hardin-Drnevich 模型中，建立修正模型，使之能够反应软黏土体软化与塑性应变累计特性；通过与模拟波浪荷载下土体应力特征的循环耦合试验结果进行对比分析，验证该修正模型的可靠性。
파랑하재능인기해상토체적주응력축련속선전。불동우지진、교통등순배하재，재주기성파랑하재작용적토체응력로경방식하，연점토적연화효용경위명현。본문분별대천연화우동적해상토체재파랑하재작용하적응력향응진행모의，병분석응력로경적특점；위묘술연화후적응력-응변관계，장연화효용화루적소성응변적삼수인입도능구반응토체동력비선성적 Hardin-Drnevich 모형중，건립수정모형，사지능구반응연점토체연화여소성응변루계특성；통과여모의파랑하재하토체응력특정적순배우합시험결과진행대비분석，험증해수정모형적가고성。
Wave load causes continuous rotation of the principal stress axes of seabed soil.Unlike seismic load and traffic load,under the action of cyclical wave load,stiffness softening of soft clay is much more obvious.Numerical simulation is applied to obtain the stress response of undis-turbed and disturbed seabed soil,and to analyze the characteristics of the stress path.Under wave loads,the main feature of the seabed soil is the continuous rotation of its maximum principal stress axis;the maximum principal stress’cycle is similar to the wave load cycles.Under the in-fluence of the structure in the seabed disturbance,the soil’s stress path changed under the wave load,and the factors that affect the stress path can be generalized using the initial principal stress orientation,the initial stress ratio,the angle of the major principal stress direction,and other fac-tors.To describe the relation of a soil’s stress and strain after stiffness softening,two parameters were introduced to the Haridin-Drnevich model to reflect the stiffness softening and cumulative plastic strain phenomenon,and these two parameters are a function of the soil’s initial status, which influences its stress path under wave load.The cyclic coupling shear tests can probably sim-ulate the wave load and therefore,this modified Haridin-Drnevich model should be compared with the results of cyclic coupling shear tests where wave loads can be applied to verify its reliability.