吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (8): 2321-2331.doi: 10.13229/j.cnki.jdxbgxb.20211083

• 交通运输工程·土木工程 • 上一篇    

基于现场监测技术的装配式箱涵温度场及冻胀分析

宫亚峰(),吴树正,毕海鹏(),谭国金   

  1. 吉林大学 交通学院,长春 130022
  • 收稿日期:2021-10-22 出版日期:2023-08-01 发布日期:2023-08-21
  • 通讯作者: 毕海鹏 E-mail:gongyf@jlu.edu.cn;bihp@jlu.edu.cn
  • 作者简介:宫亚峰(1977-),男,教授,博士. 研究方向:桥梁结构健康监测理论及应用.E-mail:gongyf@jlu.edu.cn
  • 基金资助:
    国家重点研发计划项目(2021YFB2600604);吉林省交通运输科技项目(2022-1-8);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)

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

Ya-feng GONG(),Shu-zheng WU,Hai-peng BI(),Guo-jin TAN   

  1. College of Transportation,Jilin University,Changchun 130022,China
  • Received:2021-10-22 Online:2023-08-01 Published:2023-08-21
  • Contact: Hai-peng BI E-mail:gongyf@jlu.edu.cn;bihp@jlu.edu.cn

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。

关键词: 岩土工程, 装配式箱涵, 季冻区, 温度场, 冻胀, ABAQUS

Abstract:

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.

Key words: geotechnical engineering, prefabricated box culvert, seasonal freezing area, temperature field, frost heave, ABAQUS

中图分类号: 

  • U449.1

图1

涵洞设计示意图"

图2

涵洞周围温度监测点"

图3

箱涵应变监测点"

表1

Z1~Z7位置4个时刻温度值"

测点2019/6/242019/12/102020/1/82020/6/16
Z129.6-5.1-7.522.6
Z228.9-4.3-5.922.2
Z327.2-3-3.921.5
Z426.9-2.1-220.9
Z525.6-0.9-0.920.3
Z624.11.50.919.7
Z723.62.11.919.4

表2

L1、U1、R1位置4个时刻温度值"

测点距中心距离/m2019/6/242019/12/102020/1/82020/6/16
L1-2.536.3-5.3-928
U1030.6-6.2-9.526.8
R12.535.8-6-9.427.6

表3

L5、D2、R2位置4个时刻温度值"

测点距中心距离/m2019/6/242019/12/102020/1/82020/6/16
L5-2.528.42.21.522.7
D2030.5-5-8.624.9
R22.527.62.41.923.8

表4

L6、D3、R3位置4个时刻温度值"

测点距中心距离/m2019/6/242019/12/102020/1/82020/6/16
L6-2.527.23.12.421.6
D3028.2-2.3-4.223.5
R32.526.93.92.921.4

图4

乾安县大气日平均温度随时间变化曲线"

图5

Z1~Z7测点温度随时间变化曲线"

图6

温度随深度的变化曲线"

表5

混凝土及地基土的材料参数"

项目弹性模量/MPa泊松比密度/kg?m-3
涵身3.45×10100.202500
基础3.3×10100.202500
地基10×1080.352200
回填土20×1060.351900

图7

Abaqus有限元模型"

表6

2019~2020年乾安县每月平均气温"

月份温度/(℃)月份温度/(℃)月份温度/(℃)
621.78107.282-9.86
724.6711-3.333-0.78
822.3312-12.8848.78
916.281-14.75516.56

图8

月平均温度拟合曲线"

图9

低温环境下装配式箱涵不同截面温度场分布云图"

图10

Z1-Z7监测数据与模型数据对比"

图11

涵洞周围土体温度分布图"

图12

低温环境下箱涵应力云图"

图13

低温环境下箱涵位移云图"

图14

箱涵冻胀变位图"

表7

2020年1月8日Y1~Y6测点应变数据"

测点K31+200K33+207K18+500K55+498K107+133
Y1初始值32583368361132882746
读数31463253349131712641
差值-112-115-120-117-105
Y2初始值32663041333930662875
读数33753149345731752973
差值10910811810998
Y3初始值31863135340528752994
读数32703217348529603076
差值8482808582
Y4初始值31553251355731462894
读数30863180348230792818
差值-69-71-75-67-76
Y5初始值32613177374529053064
读数31903098366828352993
差值-71-79-77-70-71
Y6初始值30633029342530143003
读数31473111350530933087
差值8482807984

表8

2020年1月8日Y1~Y6测点应变数据与模型应变数据"

测点

K31

+200

K33

+207

K18

+500

K55

+498

K107

+133

平均值模型数据
Y1-112-115-120-117-105-113.8-112.75
Y210910811810998108.4107.25
Y3848280858282.681.15
Y4-69-71-75-67-76-71.6-71.12
Y5-71-79-77-70-71-73.6-70.03
Y6848280798481.882.40

图15

Y1-Y6应变监测数据曲线对比"

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