CAJ | 학술논문

基于FEM/DEM方法建立原型尺度数值模型，模拟波浪荷载作用下斜坡上护面块体内部的应力分布和断裂破坏过程。其中结构物所受的波浪力采用微幅波的理论解计算，块体之间的运动、接触以及块体变形采用FEM/DEM方法模拟。采用基于势函数的罚函数法计算块体之间的接触力，采用Single/Smeared破坏模型模拟混凝土块体开裂，采用中心差分法的显式积分算法进行数值求解计算。分别采用文中数值模型与ANSYS模型对自重作用下块体的应力进行比较分析，给出了块体碰撞破坏的两种形式，验证了数值模型应力和变形计算的精度。通过数值模拟给出了不同波浪荷载下斜坡上护面块体的运动、内部应力分布、裂缝形成和断裂过程，给出了不同点的应力历时曲线，探讨了块体的应力变化和断裂破坏的特性。
기우FEM/DEM방법건립원형척도수치모형，모의파랑하재작용하사파상호면괴체내부적응력분포화단렬파배과정。기중결구물소수적파랑력채용미폭파적이론해계산，괴체지간적운동、접촉이급괴체변형채용FEM/DEM방법모의。채용기우세함수적벌함수법계산괴체지간적접촉력，채용Single/Smeared파배모형모의혼응토괴체개렬，채용중심차분법적현식적분산법진행수치구해계산。분별채용문중수치모형여ANSYS모형대자중작용하괴체적응력진행비교분석，급출료괴체팽당파배적량충형식，험증료수치모형응력화변형계산적정도。통과수치모의급출료불동파랑하재하사파상호면괴체적운동、내부응력분포、렬봉형성화단렬과정，급출료불동점적응력력시곡선，탐토료괴체적응력변화화단렬파배적특성。
Based on FEM/DEM method, a prototype numerical model was presented to simulate internal stress distribution, crack formation and fracture process of armor blocks on the slopes under wave action. The wave?in?duced hydrodynamic loads of the structures were calculated using the theoretical solution of the small amplitude wave. The armor blocks movement and contact between the armor blocks and the deformation of the blocks were simulated using the FEM/DEM method. The contact force between blocks was calculated by the penalty function method based on potential function. The combined single and smeared crack model was used to simulate the crack of concrete block. Numerical solution was calculated using the central difference explicit integration algorithm. By the application of numerical model and ANSYS model, the internal stress of concrete blocks under gravity were com?pared and analyzed. Two forms of collision failure of blocks were given. The calculation accuracy of stress and defor?mation of the numerical model was verified. The relative movement between armor blocks, the stress distribution within the blocks, crack formation and fracture process on the slopes under different wave loads were obtained from numerical calculation. The stress duration curves of different points were put forward. The properties of stress, crack formation and fracture process were discussed.