首页|基于双光栅传感器隧道混凝土温度应变发展特性研究

基于双光栅传感器隧道混凝土温度应变发展特性研究

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为了更好地预防隧道混凝土开裂,对混凝土温度、应变的发展规律进行研究,该文依托衢州市智慧新城三江中路连通工程,建立数据采集系统,现场监测混凝土温度与应变,该监测方法克服了传统方法温度、应变监测不灵敏以及监测数据不连续的缺陷,并且所采用的高性能双光栅温度‒应变式传感器可同时监测同一位置的温度与应变,利用温度补偿的方法克服了环境温度对监测结果的影响,提高了监测结果的精度,对监测结果进行分析,揭示隧道混凝土施工期温度、应变的发展规律.分析表明:温度随时间的变化可以分为初始阶段、快速升温阶段、缓慢降温阶段与趋于稳定阶段,应变的变化趋势与温度类似,应变峰值出现的时间稍微滞后于温度;由于养护条件、边界条件、钢筋布置等多种因素的影响,不同测点的应变在水平方向存在较大差异.
Temperature and Strain Development Characteristics of Tunnel Concrete Based on Double Grating Sensors
In order to better prevent tunnel concrete from cracking,the development law of concrete temperature and strain was studied.Based on the connection project of Sanjiang Middle Road in the Smart New City of Quzhou,a data acquisition system was established to monitor concrete temperature and strain on site.The defects of the traditional method that the temperature and strain monitoring are insensitive,and the monitoring data is discontinuous were overcome.In addition,the high-performance double grating temperature-strain sensor was used to simultaneously monitor the temperature and strain at the same position,and the temperature compensation method was used to overcome the influence of the ambient temperature on the monitoring results and improve the accuracy of the monitoring results.The monitoring results were analyzed to reveal the development law of temperature and strain during tunnel concrete construction.The analysis shows that the change of temperature with time can be divided into the initial stage,rapid heating stage,slow cooling stage,and stable stage.The variation trend of strain is similar to that of temperature,and the strain peak appears slightly later than the temperature.Due to the influence of various factors such as maintenance conditions,boundary conditions,and reinforcement arrangement,the strains of different measuring points are quite different in the horizontal direction.

open-cut tunnellarge and long-scale concretefield testtemperaturestrain

方建平、张孟喜、姚潇南

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衢州市交通设计有限公司,浙江 衢州 324000

上海大学 力学与工程科学学院,上海市 200444

明挖隧道 长大尺度混凝土 现场试验 温度 应变

浙江省交通运输厅科技计划项目

2021045

2024

中外公路
长沙理工大学

中外公路

CSTPCD
影响因子:0.626
ISSN:1671-2579
年,卷(期):2024.44(4)
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