CAJ | 학술논문

为明晰环氧沥青混凝土的断裂力学行为特征，基于数字图像处理技术，采用离散元方法建立了切口小梁二维模型，开展了环氧沥青混凝土的虚拟弯曲断裂试验．从细观角度分析了环氧沥青混凝土断裂过程中的力学响应，探讨了其断裂机理及裂纹扩展路径，并与室内试验结果进行了对比．结果表明，采用离散元方法可较好地反映环氧沥青混凝土的断裂力学特性，数值模拟过程中虚拟试件的力学响应与理论结果相符．虚拟试验获取的材料强度参数与室内试验的测试结果接近，误差仅为0．25％，但前者所得的劲度模量因破坏挠度偏大，较后者低16．56％．在裂纹扩展过程中，破坏易产生于黏结较为薄弱的集料砂浆界面．虚拟试验与室内试验的对比分析结果验证了离散元模型以及参数取值的正确性．
위명석배양력청혼응토적단렬역학행위특정，기우수자도상처리기술，채용리산원방법건립료절구소량이유모형，개전료배양력청혼응토적허의만곡단렬시험．종세관각도분석료배양력청혼응토단렬과정중적역학향응，탐토료기단렬궤리급렬문확전로경，병여실내시험결과진행료대비．결과표명，채용리산원방법가교호지반영배양력청혼응토적단렬역학특성，수치모의과정중허의시건적역학향응여이론결과상부．허의시험획취적재료강도삼수여실내시험적측시결과접근，오차부위0．25％，단전자소득적경도모량인파배뇨도편대，교후자저16．56％．재렬문확전과정중，파배역산생우점결교위박약적집료사장계면．허의시험여실내시험적대비분석결과험증료리산원모형이급삼수취치적정학성．
In order to clarify the fracture mechanical behaviors of epoxy asphalt concrete (EAC),a single-notched beam two-dimensional model was established by the discrete element method based on digital image processing technology.The virtual bending fracture tests of EAC were performed to stud-y the mechanical response in the fracture process of EAC under meso-scale.The fracture mechanism and cracks propagation paths were analyzed and compared with the laboratory test results.The results show that the discrete element method can be used to exhibit the fracture characteristics of EAC ex-cellently.The mechanical responses of the virtual tests obtained by numerical simulation are coinci-dent with the theoretical results.The material strength parameters acquired by the virtual test are close to those of the indoor tests,with an error of 0.25%.However,the stiffness modulus obtained by the virtual test is 16.56%lower than the test results due to the large deflection.The damage tends to occur in the interface with inferior adhesive performance between the aggregate and asphalt mastic during the cracks propagation.The comparison between the virtual test results and the experimental results verify the availability of the discrete element model and the relevant material parameters.