水-热-力耦合作用下寒区弧底梯形渠道结构优化设计  

Structural optimization design for trapezoidal canal with arc-bottom during thermal-moisture-mechanical coupling in cold regions

作　　者：王正中[1,2,3] 孙涛 郑艾磊[1,2] 刘铨鸿 康凯 陆立国[4] WANG Zhengzhong;SUN Tao;ZHENG Ailei;LIU Quanhong;KANG Kai;LU Liguo(Cold and Arid Regions Water Engineering Safety Research Center,Northwest Agriculture&Forestry University,Yangling 712100,China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education,Northwest Agriculture&Forestry University,Yangling 712100,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Lanzhou 730000,China;Ningxia Institute of Hydraulic Research,Yinchuan 750021,China)

机构地区：[1]西北农林科技大学旱区寒区水工程安全研究中心,陕西杨凌712100 [2]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌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,甘肃兰州730000 [4]宁夏回族自治区水利科学研究院,宁夏银川750021

出　　处：《中南大学学报（自然科学版）》2023年第5期1916-1929,共14页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2017YFC0405102);国家自然科学基金资助项目(U2003108,51279168);冻土工程国家重点实验室开放基金资助项目(SKLFSE201801)。

摘　　要：为合理优化设计寒区弧底梯形渠道的形体结构,基于冻土水热力三场耦合及冻土-衬砌相互作用的渠道冻胀数值模型,结合分层序列法将渠道断面水力参数最优解集作为变量空间,以衬砌结构的强度、刚度及几何构造为约束条件,以衬砌适应冻胀变形能力为目标函数,建立寒区弧底梯形渠道水力-抗冻胀双优数学模型。随后对寒区各类典型渠道工程进行双优结构标准化设计,得到弧底梯形渠道在不同负温、地下水埋深、土质、断面规模下的双优边坡系数、实佳比及衬砌厚度的标准参数,供工程设计参考。研究结果表明:双优结构尺寸参数均随地下水埋深的增大而减小、随基土冻胀率的增大而增大、随冬季负温的降低而增大、随断面规模的增大而增大。以新疆某渠道工程为例,优化后的断面实佳比为1.02,较原设计值增大1.8%;最大法向冻胀量为2.52 cm,较原设计值增大20.0%;最大拉应力为0.95 MPa,较原设计值减小60.4%;衬砌整体柔度为305.47 cm/MPa,较原设计值增大42.3%,水力性能及抗冻胀性能均达到最优。In order to optimize the shape structure of trapezoidal canal with arc-bottom in cold region,a bi-objective optimization mathematical model was established for the water conveyance performance and anti-frost heave performance of the trapezoidal canal with arc-bottom in cold region.This mathematical method was based on the canal frost heave numerical model of thermal-moisture-mechanical coupling of frozen soil and the interaction between frozen soil and lining and the hierarchical sequence method.It was taken the optimal solution set of the hydraulic parameters of the canal's section as the variable space,was taken the strength,stiffness and geometric structure of the lining structure as the constraint conditions,and was taken the ability of the lining to adapt to the frost heave deformation as the objective function.Subsequently,standard designs of bi-objective optimal structures were carried out for various typical canal projects in cold regions,and a standard parameter table including the bi-objective optimal slope coefficient,the ratio of practical economic section to hydraulic optimum section and the lining thickness of the trapezoidal canal with arc-bottom was obtained at different temperatures,groundwater depths,soil quality and cross-section scale.The standard parameter table can provide reference for engineering design.The results show that the size parameters of the bi-objective optimal structure decrease with the increase of groundwater buried depth,increase with the increase of foundation soil frost heave rate,increase with the decrease of negative temperature in winter and the increase of section size.Taking a canal project in Xinjiang as an example,the ratio of practical economic section to hydraulic optimum section is 1.02,which is 1.8% higher than the original design value.The maximum normal frost heave is 2.52 cm,which is 20.0% higher than the original design value.The maximum tensile stress is 0.95 MPa,which is 60.4% lower than the original design value.The overall flexibility of the lining is 30

关 键 词：冻土 水-热-力耦合 冻土-衬砌相互作用 弧底梯形渠道 水力-抗冻胀双优 

分 类 号：TV68[水利工程—水利水电工程] S277[农业科学—农业水土工程]