水热耦合变化下衬砌渠道冻胀响应  

Freezing and expansion response of lined channels under changes in hydrothermal coupling

作　　者：王羽岱 王斌[1,2,3] 苗福生[1] 马楠 WANG Yu-dai;WANG Bin;MIAO Fu-sheng;MA Nan(School of Civil and Hydraulic Engineering,Ningxia University,Ningxia 750021,China;The Engineering Research Center of the Ministry of Education for Efficient Utilization of Modern Agricultural Water Resources in Arid Areas,Yinchuan 750021,China;Ningxia Water-saving irrigation and Water Resource Regulation Engineering Technology Research Center,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]旱区现代农业水资源高效利用教育部工程研究中心,银川750021 [3]宁夏节水灌溉与水资源调控工程技术研究中心,银川750021

出　　处：《吉林大学学报(工学版)》2025年第1期256-268,共13页Journal of Jilin University:Engineering and Technology Edition

基　　金：宁夏自然科学基金项目(2022AAC03090);宁夏重点研发(引才专项)基金项目(2020BEB04031);宁夏高等学校一流学科建设基金项目(NXYLXK2021A03)。

摘　　要：为研究渠基土在水分与温度变化下的力学特性与冻胀特性变化特征及在水分与温度变化下衬砌渠道的冻胀响应,本文通过对渠基土进行力学特性与冻胀特性试验,研究了不同水分、不同温度条件下渠基土力学特性和冻胀特性的变化规律。并以此为依据,采用有限元数值模拟,基于水热耦合变化,对渠基土冻胀下衬砌渠道冻胀响应进行了研究。结果表明:渠基土力学特性与冻胀特性在水热耦合下呈现出复杂性。温度差异小时,水分差异对衬砌渠道冻胀变形影响小。温度差异大时,水热耦合对衬砌渠道冻胀变形影响显著。-2℃、-12℃下,衬砌渠道最大冻胀变形相较渠道底部变形大54%、70%。温度差异越大,不同温度条件下法、切向冻胀力差距越大。-5℃下最大法向、切向冻胀力相较-2℃大175%、173%,-15℃下最大法向、切向冻胀力相较-5℃大408%、200%。水分差异相较温度差异对冻胀作用影响小。在水热耦合下,渠基土冻胀作用分布具有非均匀性特征且衬砌渠道裂缝发展与分布特征具有一定规律性。温度差异越大,不同水热条件下衬砌渠道冻胀应力差距越大。-6℃下最大冻胀应力相较-4℃大57%。-14℃下最大冻胀应力相较-6℃大183%。温度越低,水分越多,对衬砌渠道冻胀应力影响越显著。本研究可为衬砌渠道在水热耦合变化下防冻胀设计与结构优化提供参考。In order to study the change characteristics of mechanical properties and frost expansion characteristics of canal subsoil under the change of moisture and temperature and the frost expansion response of lined channel under the change of moisture and temperature,the mechanical properties and frost expansion characteristics of canal subsoil were tested,and the change rules of mechanical properties and frost expansion characteristics of canal subsoil were studied under the condition of different moisture and different temperature.And based on this,using finite element numerical simulation,based on the water-heat coupling change,the lining channel frost expansion response under the frost expansion of the channel subsoil is studied.The results show that the mechanical properties and freezing and expansion characteristics of the channel subsoil show complexity under hydrothermal coupling.When the temperature difference is small,the moisture difference has little effect on the frozen deformation of lined channels.When the temperature difference is large,the hydrothermal coupling has a significant effect on the freezing and expansion deformation of lined channels.Under-2℃ and-12℃ ,the maximum freezing deformation of the lined channel is 54% and 70% larger than that of the bottom of the channel.The larger the temperature difference,the larger the gap between normal and tangential freezing expansion force under different temperature conditions.The maximum normal and tangential freezing expansion force at-5℃ is 175% and173% larger than that at-2℃ ,and the maximum normal and tangential freezing expansion force at-15℃ is408% and 200% larger than that at-5℃ .Moisture difference has a small effect on frost heave compared to temperature difference.Under the hydrothermal coupling,the distribution of freezing and expansion of channel foundation soil has non-uniform characteristics and the development and distribution of cracks in lined channels have certain regularity.The larger the temperature difference is,the large

关 键 词：水工结构工程 水热变化 衬砌渠道 耦合影响 冻胀响应 开裂特征 

分 类 号：S277[农业科学—农业水土工程]