基于双参数弹性地基梁理论的梯形渠道冻胀力学模型  

Frost-heaving mechanical model of concrete lining trapezoidal canal based on two-parameter elastic foundation beam theory

作　　者：肖旻 王正中[2,3] 吴浪 杨晓松 崔浩[1] 葛建锐 Xiao Min;Wang Zhengzhong;Wu Lang;Yang Xiaosong;Cui Hao;Ge Jianrui(School of Civil Engineering,Jiangxi Science&Technology Normal University,Nanchang 330013,China;Research Center of Arid and Cold Regions Water Engineering Safety,Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education,Northwest A&F University,Yangling 712100,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;College of Water Conservancy and Construction Engineering,Tarim University,Alaer 843300,China;College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]江西科技师范大学建筑工程学院,南昌330013 [2]西北农林科技大学旱区寒区水工程安全研究中心,旱区农业水土工程教育部重点实验室,杨凌712100 [3]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,兰州730000 [4]塔里木大学水利与建筑工程学院,阿拉尔843300 [5]兰州理工大学能源与动力工程学院,兰州730050

出　　处：《农业工程学报》2022年第14期71-78,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划重点专项(2017YFC0405100);国家自然科学基金项目(U2003108,51641903,51869029);冻土工程国家重点实验室开放基金项目(SKLFSE201801);江西科技师范大学博士科研启动基金项目(2019BSQD11);江西省教育厅科技项目(GJJ190621)。

摘　　要：为克服已有梯形渠道弹性地基梁模型未考虑土体连续性及需要预先假定切向冻结力分布的不足,该研究在Winkler模型的基础上,用土弹簧的伸缩来描述法向冻胀力与法向冻结力,引入剪切层和接触界面层构建了梯形渠道双参数冻土地基梁模型。通过引入剪切层考虑土弹簧间的相互作用,引入接触界面层把切向冻结力计算纳入模型中一体化求解。以甘肃省靖会总干渠梯形渠道为例,计算了衬砌板法向冻胀位移,并将计算值与Winkler模型、有限元法计算结果及试验值进行对比分析,最后对衬砌板各点切向位移及切向冻结力分布进行计算。结果表明:本文模型计算值与Winkler模型、有限元法计算结果的总体变化趋势一致,且与试验值更加接近,当剪切系数g=0时双参数模型则退化为Winkler模型,验证了模型合理性;衬砌板各点切向位移及切向冻结力呈非线性分布,且随切向刚度增大,各点切向位移总体呈减小趋势,与实际相符。本研究可为梯形渠道抗冻胀设计提供参考。An elastic foundation beam theory can be used to properly and effectively deal with the interaction between soil and structure. The theory application has also been gradually promoted in the frost-heaving mechanical analysis of frozen soil engineering structures in recent years. However, the existing Winkler model cannot consider the continuity of frozen soil. It is very necessary to presuppose the distribution of tangential freezing force. In this study, the governing differential equations were presented for the normal and tangential directions. The Pasternak shear layer was also introduced to connect the adjacent soil springs and contact interface layer between the frozen soil and concrete lining plate. Then, the frost-heaving mechanical model of the trapezoidal concrete lining canal was established using the two-parameter Pasternak elastic frozen soil foundation. The model was effectively connected with the SL23-2006“Specification for Design of Anti-freeze of Canal Engineering”. The frost-heaving mechanical analysis was applied to the concrete lining canals with the deep groundwater table. The computational accuracy of the frost-heaving mechanical model was improved significantly, where the shear layer was introduced to describe the interaction between the Winkler soil springs. The distribution of tangential freezing force was incorporated into the elastic foundation beam theory through the introduction of the contact interface layer. As such, there was no need for an improved model for the distribution of tangential freezing force. Taking the trapezoidal main canal of the Jinghui irrigation area in Gansu Province of China as the prototype, the improved model was applied to calculate the normal frost-heaving displacement of each point on the concrete lining plate. A comparison was then made on the Winkler model, the Finite Element Model(FEM) and test values. The comparative analysis indicated that there was consistent overall variation and tendency in the presented model, Winkler model, and FEM simulation

关 键 词：冻土工程 渠道 冻胀 弹性地基梁 双参数模型 

分 类 号：S277[农业科学—农业水土工程] TV67[农业科学—农业工程]