CAJ | 학술논문

基于离散元方法建立了沥青混合料的细观力学结构模型，并通过虚拟三轴剪切试验，模拟验证了该模型的合理性。首先，开发了基于方孔筛工作机制的粗集料生成算法，建立了不规则形状的颗粒，使得粗集料的形状控制多样化和精确化。然后，将具有实际纵向分布特征的空隙相引入到沥青混合料的细观结构模型中，取代了传统方法中空隙随机分布的处理模式。结合室内试验和虚拟试验，获取了中高温条件下的沥青砂浆接触本构模型参数。虚拟三轴剪切试验的模拟结果以及对沥青混合料抗剪强度的预测结果验证了建立的细观结构力学模型的合理性，离散元虚拟试件产生的剪切破坏和实际试件破坏形态一致，由虚拟试验得到的抗剪强度和实际结果基本吻合。
기우리산원방법건립료력청혼합료적세관역학결구모형，병통과허의삼축전절시험，모의험증료해모형적합이성。수선，개발료기우방공사공작궤제적조집료생성산법，건립료불규칙형상적과립，사득조집료적형상공제다양화화정학화。연후，장구유실제종향분포특정적공극상인입도력청혼합료적세관결구모형중，취대료전통방법중공극수궤분포적처리모식。결합실내시험화허의시험，획취료중고온조건하적력청사장접촉본구모형삼수。허의삼축전절시험적모의결과이급대력청혼합료항전강도적예측결과험증료건립적세관결구역학모형적합이성，리산원허의시건산생적전절파배화실제시건파배형태일치，유허의시험득도적항전강도화실제결과기본문합。
A mesoscopic mechanic structure model of asphalt mixture is established based on the dis-crete element method and validated by using the virtual triaxial shear tests.First,a coarse aggregate generation algorithm is developed based on the working mechanism of the square sieve system,ag-gregates with irregular shapes are generated,making the shape control of coarse aggregate diversified and precise.Then,the air void phase with actual longitudinal distribution scenario is introduced into the mesoscopic structure model of asphalt mixture,which substitutes the random distribution in tradi-tional methods.The contact constitutive parameters of asphalt mastic at medium and high tempera-tures are obtained by combing laboratory tests and virtual tests.The simulation results of virtual tri-axial shear tests and the predictive results for anti-shear strengths of asphalt mixture verify the reason-ableness of the proposed mesoscopic mechanic structure model.The shear damage modes from the laboratory tests and those of the actual specimens are similar,and the shear strengths of laboratory tests generally agree with the actual results.