交通荷载与冻融作用下黄土累积变形研究  

Study on Cumulative Deformation of Loess under Traffic Loads and Freeze-thaw

作　　者：赵新欣 李栋伟 安令石 季安 何锦 秦子鹏 夏明海 ZHAO Xinxin;LI Dongwei;AN Lingshi;JI An;HE Jin;QIN Zipeng;XIA Minghai(School of Civil and Architectural Engineering,Donghua University of Science and Technology,Nanchang 330013,Jiangxi,China;China Nuclear Huatai Construction Co.,Ltd.,Shenzhen 518055,Guangdong,China;Irrigation Management Office of Kuitun River Basin,Ili Kazakh Autonomous Prefecture,Kuitun 833200,Xinjiang,China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330013 [2]中核华泰建设有限公司,广东深圳518055 [3]伊犁哈萨克自治州奎屯河流域水利工程灌溉管理处,新疆奎屯833200

出　　处：《水力发电》2023年第4期107-112,共6页Water Power

基　　金：国家自然科学基金资助项目(42061011,41977236);江西省自然科学基金项目(20192ACBL20002);新疆兵团科技计划项目(2020AB003)。

摘　　要：为揭示季节性冻土区路基黄土在循环交通荷载和冻融作用下的累积应变特性,进行循环加载试验,探讨冻融循环次数、含水率、动应力幅值、振动频率对冻融后黄土累积塑性应变的影响。结果表明,在试验条件范围内土体并未破坏,产生的累积变形较小且累积应变曲线皆表现为稳定型;循环荷载作用下产生的累积应变随冻融循环次数、含水率、动应力幅值的增加而增大,随振动频率的增加而减小。根据试验结果,提出了考虑冻融循环次数的累积应变指数双曲函数预测模型,并利用试验数据验证了模型的合理性。研究结果可为季节性冻土区路基黄土的沉降预测提供参考。In order to reveal the cumulative strain characteristics of subgrade loess in seasonal permafrost area under cyclic traffic loads and freeze-thaw action,a cyclic loading experiment is carried out to explore the effects of freeze-thaw cycle times,moisture content,dynamic stress amplitude and loading frequency on the cumulative plastic strain of loess after freeze-thawing.The results show that,(a)the soil mass is not damaged within the test conditions,the cumulative deformation is smaller,and the cumulative strain curve is stable;and(b)the cumulative strain generated under cyclic load increases with the increase of freeze-thaw times,moisture content and dynamic stress amplitude,and decreases with the increase of loading frequency.According to the experimental results,a prediction model of the cumulative strain index hyperbolic function considering freeze-thaw cycle times is proposed,and the rationality of the model is verified by using the experimental data.The results can provide a reference for the settlement prediction of subgrade loess in seasonal permafrost areas.

关 键 词：黄土 铁路路基 季节性冻土区 累积变形 冻融循环 循环荷载 预测模型 累积应变 双曲函数 

分 类 号：TU411.93[建筑科学—岩土工程]