基于内聚力模型的沥青混合料开裂特性  

Cracking Characteristics of Asphalt Mixture Based on Cohesion Model

作　　者：高俊亮 吴超 郭志栋 GAO Junliang;WU Chao;GUO Zhidong(Gansu Provincial Highway Construction and Management Group Co,Lanzhou 730070,China;Gansu Architectural Vocational and Technical College,Lanzhou 730070,China)

机构地区：[1]甘肃省公路建设管理集团有限公司,兰州730070 [2]甘肃建筑职业技术学院,兰州730070

出　　处：《科技和产业》2025年第5期94-99,共6页Science Technology and Industry

摘　　要：为了深入分析沥青混合料在细观层面的开裂损伤及相关影响因素,采用数字图像处理技术,基于ABAQUS有限元模拟软件,同时在沥青砂浆及集料-砂浆界面插入零厚度内聚力单元,对沥青混合料SCB(半圆弯曲)试验进行有限元模拟。分析细观层面沥青混合料开裂过程,结合试件开裂得到的荷载-位移曲线与断裂能探究预制切口深度、试件厚度、支座间距对沥青混合料开裂特性的影响。结果表明,试件预制切口越深、厚度越小,试件的抗开裂性能越差,而随着支座间距的增大,抗开裂性能先增大后减小,在支座间距为80 mm时,试件的抗开裂性能最好。Digital image processing technology and finite element simulation software based on ABAQUS were adopted to analyze the cracking damage and related influencing factors of asphalt mixture at the meso level.At the same time,zero-thickness cohesive force units were inserted at the asphalt mortar and aggregate-mortar interface to conduct finite element simulation of asphalt mixture SCB(semi-circular bending)test and analyze the cracking process of asphalt mixture at the meso level.The effects of pre-cut depth,specimen thickness and support distance on the cracking characteristics of asphalt mixture were investigated by using the load-displacement curve and fracture energy obtained from the cracking of the specimen.The results show that the deeper the prefabricated incision and the smaller the thickness of the specimen,the worse the anti-cracking performance of the specimen,and the anti-cracking performance increases first and then decreases with the increase of the distance between the supports.The anti-cracking performance of the specimen is the best when the distance between the supports is 80 mm.

关 键 词：沥青混合料 半圆弯曲(SCB)试验 有限元模拟 断裂能 

分 类 号：U414[交通运输工程—道路与铁道工程]