基于内聚力模型CZM的水工沥青混凝土开裂损伤影响因素分析  

Analysis of Influencing Factors of Cracking Damage of Hydraulic Asphalt Concrete Based on Cohesion Model CZM

作　　者：吴鹏 王俊杰 刘良军 孙众 凌会坤 WU Peng;WANG Jun-jie;LIU Liang-jun;SUN Zhong;LING Hui-kun(College of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Tengyun Engineering Consulting Co.,LTD.,Chongqing 409003,China;Chongqing Wushan Water Conservancy Development Co.,LTD.,Chongqing 404700,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学材料科学与工程学院,重庆400074 [2]重庆腾云工程咨询有限公司,重庆409003 [3]重庆巫山水利发展有限公司,重庆404700 [4]重庆交通大学河海学院,重庆400074

出　　处：《中国农村水利水电》2025年第4期90-96,共7页China Rural Water and Hydropower

基　　金：重庆市水利科技项目(CQSLK-2023006)。

摘　　要：为探究水工沥青混凝土开裂损伤的影响因素,通过室内试验获取有限元参数,采用内聚力模型CZM对沥青混凝土开裂过程进行数值模拟。在沥青砂浆和沥青砂浆-骨料黏结面插入零厚度cohesive单元,通过程序代码实现骨料随机分布,分析了骨料形状及空间分布、试件尺寸、初始裂缝长度以及骨料含量对沥青混凝土抗裂性能的影响,模拟了沥青混凝土从裂缝萌芽、裂缝扩展到完全失效的全过程。结果表明:裂缝最初在沥青砂浆-骨料黏结面处萌芽,随后贯穿沥青砂浆界面从而完成开裂,其中骨料粒径越大、数量越多的区域,裂缝出现概率越大且数量越多;骨料形状越规则,分布越均匀,材料抵抗开裂能力就越强;小尺寸试样的抗裂性能受骨料空间分布影响更明显,力学性能变化更敏感;骨料含量占比越大,沥青砂浆-骨料黏结面量越多,即薄弱区域越多,沥青混凝土极限承载能力就越弱。In order to explore the influencing factors of cracking damage of hydraulic asphalt concrete,finite element parameters were obtained through laboratory tests,and the cohesive force model CZM was used to numerically simulate the cracking process of asphalt concrete.A zero-thickness cohesive unit was inserted into the asphalt mortar and asphalt mortar-aggregate bonding surface,and the random distribution of aggregate was realized by program code.The influences of aggregate shape and spatial distribution,specimen size,initial crack length and aggregate content on the crack resistance of asphalt concrete were analyzed,and the whole process from crack germination and crack expansion to complete failure of asphalt concrete was simulated.The results show that cracks initially sprout at the bonding surface of asphalt mortar and aggregate,and then penetrate through the interface of asphalt mortar to complete the cracking.The larger the particle size and quantity of aggregate,the greater the probability and quantity of cracks.The more regular the aggregate shape and the more uniform the distribution,the stronger the material resistance to cracking;The spatial distribution of recipient aggregate with small specimen size is more obvious,and the mechanical properties are more sensitive.The greater the proportion of aggregate content,the more asphalt mortar aggregate bonding surface,that is,the more weak areas,the weaker the ultimate bearing capacity of asphalt concrete.

关 键 词：沥青混凝土 半圆弯曲试验 内聚力模型 随机骨料 细观开裂 

分 类 号：TU535[建筑科学—建筑技术科学]