基于细观模型的水稳碎石抗温缩性能虚拟试验研究  

Virtual Experimental Study of Resistance to Temperature Shrinkage of Cement Stabilized Crushed Stone Based on Mesoscopic Model

作　　者：王丽丽 杨泉华 仲光昇 许涛[2] WANG Lili;YANG Quanhua;ZHONG Guangsheng;XU Tao(Suzhou Sanchuang Road Surface Engineering Co.,Ltd.,Suzhou 215124,China;Southeast University,Nanjing 211189,China)

机构地区：[1]苏州三创路面工程有限公司,苏州215124 [2]东南大学,南京211189

出　　处：《现代交通技术》2024年第4期6-12,共7页Modern Transportation Technology

摘　　要：水泥稳定碎石的温度收缩开裂问题长期以来未得到充分解决,其影响因素众多,在工程实践中难以确定具体改善措施。细观分析方法的发展为其提供了新的虚拟试验技术支持。以抗裂型水泥稳定碎石和普通水泥稳定碎石为对象,建立了基于内聚力单元的圆柱体试件模型,模拟单次降温条件,对不同级配参数和力学参数试件的抗温度收缩性能进行了对比研究。结果表明,采用零厚度内聚力单元的模型具有合理性,5种不同级配越接近连续级配、集料-砂浆界面和砂浆内部界面间黏结强度越大,水泥稳定碎石的抗温缩性能越差。为提高其抗温缩性能,应优先选择间断级配,并可采取适当措施降低集料和砂浆之间的黏结强度。The problem of temperature shrinkage cracking of cement stabilized crushed stone has not been fully solved for a long time.There are many influencing factors,and it is difficult to decide specific improvement measures in engineering practice.The development of mesoscopic analysis provides a new support for virtual experiments.Taking anti-cracking cement stabilized crushed stone and common cement stabilized crushed stone as objects,a cylinder specimen model based on cohesive force unit was established to simulate a single cooling condition,and the resistance to temperature shrinkage of specimens with different levels of parameters and mechanical parameters were compared.The results show that the zero-thickness cohesive unit model is reasonable,the more the five different gradations tend to be continuous grading,the greater the bond strength between aggregate and mortar interface and mortar internal interface,and the worse the resistance to temperature shrinkage of cement stabilized crushed stone.In order to improve the resistance to temperature shrinkage,gap grading should be preferred,and appropriate measures can be taken to reduce the bond strength between aggregate and mortar.

关 键 词：水泥稳定碎石 抗温缩性能 细观模型 虚拟试验 

分 类 号：U416.2[交通运输工程—道路与铁道工程]