差异冻胀条件下双参数地基梯形渠道冻胀变形的计算模型  

Calculation model for the frost-heaving deformation of trapezoidal canal on two-parameter foundation under uneven frost heave conditions

作　　者：肖旻 杨晓松[2] 王正中[3,4] 吴浪 崔浩[1] 席琛 XIAO Min;YANG Xiaosong;WANG Zhengzhong;WU Lang;CUI Hao;XI Chen(School of Civil Engineering,Jiangxi Science&Technology Normal University,Disaster Prevention and Mitigation Engineering Technology Research Base of Think Tank of Jiangxi Association for Science and Technology,Nanchang 330013,China;College of Water Conservancy and Construction Engineering,Tarim University,Alaer 843300,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,CAS,Lanzhou 730000,China)

机构地区：[1]江西科技师范大学土木工程学院,江西省科协智库防灾减灾工程技术研究基地,南昌330013 [2]塔里木大学水利与建筑工程学院,阿拉尔843300 [3]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 [4]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

出　　处：《农业工程学报》2024年第17期129-139,共11页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51869029、51641903、U2003108);国家重点研发计划重点专项(2017YFC0405100);新疆生产建设兵团一师横向项目(SWJ2022KT23);冻土工程国家重点实验室开放基金项目(SKLFSE201801);江西省教育厅科技项目(GJJ190621);江西科技师范大学博士科研启动基金项目(2019BSQD11)。

摘　　要：衬砌冻胀变形便于监测且易于控制,成为《渠系工程抗冻胀设计规范SL23-2006》明确提出的渠道抗冻胀设计控制指标,但规范没有提供差异冻胀变形的具体计算方法。为便捷、合理计算差异冻胀条件下衬砌结构冻胀变形,在现有研究基础上,考虑渠道断面各点地下水位逐点不同及渠基冻土受力变形的连续性,基于双参数冻土地基理论构建了差异冻胀条件下寒区梯形渠道冻胀变形与内力计算模型。以甘肃省靖会总干渠为算例,将该模型退化为均匀冻胀条件下的Winkler模型并进行对比分析,结果表明传统Winkler模型可视为该研究模型的特殊情形。以新疆塔里木灌区某梯形渠道为原型,用幂级数方法对该研究模型进行求解,并与材料力学法、Winkler模型计算值及观测值进行了对比分析。结果表明:应用该研究模型、传统Winkler模型、材料力学方法计算的冻胀变形与观测值的平均相对误差分别为4.31%、9.23%、17.45%,均方根误差分别为0.17、0.29、0.47 cm。可见与材料力学法、传统Winkler模型相比,考虑冻土-衬砌相互作用及冻土中剪力扩散的双参数地基模型能更好地反映差异冻胀条件下梯形渠道的力学行为,计算值与观测值更加一致。通过把形式多样的渠基土自由冻胀量分布统一展开成幂级数形式,可以有效提高模型对不同复杂基土差异冻胀模式的通用性。研究为差异冻胀条件下寒区梯形渠道冻胀力学分析提供了一种有效的计算模型。Frost-heaving resistance of canals can be designated to evaluate the control parameters in cold regions.As proposed in the national standard of SL23-2006"Design Code for Frost Heave Resistance of Canal System Engineering",the frost-heaving deformation of the canal concrete lining structure can be expected to readily monitor and control in practice.However,the specification cannot provide the specific calculation of uneven frost-heaving deformation in the canal concrete lining.This study aims to facilitate the accurate and practical calculation for the frost-heaving deformation of concrete lining structures under uneven frost-heaving deformation conditions.The fluctuation of groundwater levels was considered across different points along the canal cross-section,together with the continuous deformation within the canal foundation soil.A calculation model was developed for the frost-heaving deformation and internal force of trapezoid concrete lining canal in cold regions under differential frost heave conditions,according to the two-parameter foundation beam of frozen soil.Taking the main trunk canal of Jinghui in Gansu Province as an example,the presented model degenerated into the Winkler model under uniform frost heave conditions.Comparative analysis showed that the traditional Winkler model was regarded as a special case within the proposed model.Some measuring points were simultaneously considered for the shady slope,sunny slope,and bottom of the canal.The Root Mean Square Error(RMSE)between the presented model and observed values was determined to be 0.23,with the Mean Relative Error(MRE)of 4.82%.Taking a trapezoidal concrete lining canal in the Tarim Irrigation area of Xinjiang Uygur Autonomous Region as the prototype,the frost-heaving deformation of the concrete lining structure was calculated at the same time.The results show that the better mechanical performance of the concrete lining canal was achieved in the improved model considering the frozen soil-structure interaction and diffusion of shear force in

关 键 词：渠道 模型 土壤 冻土 双参数地基 差异冻胀 

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