基于现场监测技术的装配式箱涵温度场及冻胀分析  

Temperature field and frost heaving analysis of prefabricated box culvert based on field monitoring

作　　者：宫亚峰[1] 吴树正 毕海鹏[1] 谭国金[1] GONG Ya-feng;WU Shu-zheng;BI Hai-peng;TAN Guo-jin(College of Transportation,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学交通学院,长春130022

出　　处：《吉林大学学报（工学版）》2023年第8期2321-2331,共11页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家重点研发计划项目(2021YFB2600604,2021YFB2600600);吉林省交通运输科技项目(2022-1-8,2021-1-1,2018ZDGC-16);吉林省科技发展计划项目(20230402048GH);黑龙江交通运输厅重点项目(2022-1,2022-2).

摘　　要：以实际工程为依托,通过获取装配式箱涵周围土体温度及微应变的现场监测技术,在涵周埋设不同数量的温度传感器和振弦应变计,并借助有限元软件分析,探究箱涵周围土体的温度场分布规律及冻胀特性。首先,对箱涵周围土体的温度及微应变进行为期12个月的监控测量;其次,基于焓场求解的非稳态传热理论,通过有限元软件建立相应的数值模型并对比分析监测数据,对装配式箱涵周围土体变化规律进行剖析。研究结果表明:受热辐射和空气对流的共同影响,涵周土体温度呈现出季节性的变化规律;短暂升温形成的棉被效应,导致温度随土体深度呈现先下降后上升的趋势;受冻胀力影响,箱涵应力最大位置在铰接处,隆起位移最大位置在涵顶处。Based on the actual project,through the field monitoring by acquiring soil temperature and micro-strain around prefabricated box culverts,different numbers of temperature sensors and vibrating string strain gauges are buried around the culvert,and with the help of finite element software analysis,the temperature field distribution and frost heaving characteristics of the soil around the box culvert is explored.Firstly,the temperature and micro-strain of the soil around the box culvert were monitored for 12 months.Secondly,based on the unsteady heat transfer theory solved by enthalpy field,the corresponding numerical model is established by finite element software and the monitoring data are compared and analyzed to analyze the variation law of soil around the prefabricated box culvert,and finally draw some conclusions.The results show that the soil temperature around the culvert shows seasonal variation under the combined influence of thermal radiation and air convection.the quilt-effect caused by transient heating leads to a trend that temperature decreases first and then increases with soil depth.Affected by frost heaving force,the maximum stress position of box culvert is at the hinge and the maximum uplift displacement is at the top of the culvert.

关 键 词：岩土工程 装配式箱涵 季冻区 温度场 冻胀 ABAQUS 

分 类 号：U449.1[建筑科学—桥梁与隧道工程]