水泥稳定碎石基床冻融劣化试验及模型研究  

Tests and Model Studies on the Deterioration of Freezing-thawing of Cement-stabilized Macadam Subgrade Bed in High-speed Railway

作　　者：介少龙 岳祖润[1] 孙铁成[1,2] 杨志浩 张晗冰[2] JIE Shao-long;YUE Zu-run;SUN Tie-cheng;YANG Zhi-hao;ZHANG Han-bing(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学,省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《科学技术与工程》2021年第8期3318-3324,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51708369);河北省自然科学基金(E2020210006,E2020210044)。

摘　　要：为研究季节性冻土地区高铁路基水泥稳定碎石基床长期冻融循环耐久性,将宏观试验与结构内部微元体的损伤发展相结合,建立了基于Morgan-Mers-Flodin(MMF)模型的高铁路基水泥稳定碎石基床冻融耐久性劣化模型,室内长期冻融循环试验以无侧限抗压强度和抗折强度作为评估水泥稳定碎石材料冻融耐久性的指标。研究结果表明:首先,无侧限抗压强度和抗折强度可表征水泥稳定碎石的冻融耐久性劣化规律;其次,以无侧限抗压强度损失率为控制指标,建立的冻融耐久性预测模型与室内试验保持一致;最后,水泥含量由3%增加至5%时,材料内部抗冻融损伤能力明显提高,建议高铁路基水泥稳定碎石基床水泥掺量为5%。研究结果以期为高铁路基水泥稳定碎石基床强度标准的制定,以及施工和安全运营提供理论支撑。The research aims to study the freezing-thawing durability of high-speed railway subgrade bed in seasonal freezing area.Based on Morgan-Mers-Flodin(MMF)model,a deterioration model of freezing-thawing durability was established by combining the macro tests with the damage development of micro-elements.Unconfined compressive strength and flexural strength were used as the indexes to evaluate the freezing-thawing durability of cement stabilized macadam.The results show that the unconfined compressive strength and flexural strength can characterize the deterioration law of freezing-thawing durability of cement stabilized macadam firstly.Secondly,the unconfined compressive strength loss rate is used as the damage factor,and the freezing-thawing durability prediction model is highly consistent with the laboratory test data.Finally,the resistance of cement stabilized macadam to freezing-thawing damage is improved obviously when the cement content increases from 3% to 5%.It is suggested that the cement parameter of cement-stabilized macadam subgrade bed in high-speed railway is 5%.The research results are expected to provide theoretical support for the formulation of the strength standard of cement-stabilized macadam in high-speed railway,as well as the construction and safe operation.

关 键 词：路基基床 无侧限抗压强度 抗折强度 水泥稳定碎石 冻融耐久性 

分 类 号：U215.2[交通运输工程—道路与铁道工程]