###
工程科学与技术:2023,55(1):296-303
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
基于热效应的涉水混凝土工程裂缝监测方法
陈江1,2,3, 熊杰3, 李宇驰3, 熊峰1,2,3
(1.四川大学 灾变力学与工程防灾四川省重点实验室,四川 成都 610065;2.四川大学 深地科学与工程教育部重点实验室,四川 成都 610065;3.四川大学 建筑与环境学院,四川 成都 610065)
Crack Monitoring Method for Wading Concrete Engineering Based on Thermal Effects
(1.Failure Mechanics and Eng. Disaster Prevention Key Lab. of Sichuan Province, Sichuan Univ., Chengdu 610065, China;2.Key Lab. of Deep Earth Sciences and Eng. (Sichuan Univ.), MOE, Chengdu 610065, China;3.College of Architecture & Environment, Sichuan Univ., Chengdu 610065, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 85次   下载 43
投稿时间:2021-10-11    修订日期:2021-11-30
中文摘要: 相比于常规混凝土结构,水下混凝土结构开裂对结构安全具有更加恶劣的影响,准确、及时地监测裂缝的发生发展过程,对保障涉水工程安全、防止事故具有重要意义。本文基于流体-热源-裂缝的热效应耦合作用,提出水下混凝土结构裂缝监测的温度示踪法,并设计3种裂缝监测方案,分别采用监测管-多孔套管组件、监测管-空心套管组件和监测管-灌水管组件实现开裂信息与开裂部位热力学信息的转换。其中:前两种监测方案主要利用热传导原理,使开裂后裂缝周围介质的热力学参数发生改变,从而改变热量传递规律;第3种方案主要利用对流传热原理,通过灌水使裂缝截面产生对流传热效应,从而提高传热速度。针对上述3种监测方案,分别制作了混凝土梁试件,采用光纤光栅温度传感器和陶瓷加热管组成的传感加热单元开展了瞬态传热模型试验,根据热源降温曲线的分段特征,定义了反映热源降温速度的判别指标,利用该指标进行裂缝的识别,并对3种方案的裂缝识别效果进行分析和对比。结果表明:3种监测方案均能很好地判断是否有裂缝产生;在裂缝定位方面,方案3效果更好;在裂缝宽度定量识别方面,方案1无法识别裂缝宽度,方案2仅可在流动水环境中识别裂缝宽度,方案3可根据渗漏流量识别裂缝宽度。
Abstract:Compared with conventional concrete structures, cracking of underwater concrete structures have a worse effect on structural safety. Accurate and timely monitoring of cracks in the process of occurrence and development is of great significance to ensure the safety of wading engineering and prevent accidents. Based on the coupling effects among fluid, heat source, and crack, a temperature tracer method for crack monitoring in underwater concrete structures was proposed and three crack monitoring schemes were designed. These three monitoring schemes realize the conversion between cracked information and thermodynamic information of cracked position using assemblies with monitoring tube and microporous casing, monitoring tube and hollow casing, and monitoring tube and irrigation tube, respectively. Among them, the first two monitoring schemes mainly use the principle of heat conduction to change the thermodynamic parameters of the medium around the cracks after cracking, so as to change the heat transfer law of the heat source. The third scheme mainly uses the principle of convective heat transfer and makes the crack section produce a convective heat transfer effect through irrigation, so as to improve the heat transfer speed. Concrete beam specimens were made according to the above three monitoring schemes, respectively. The transient heat transfer model tests were carried out by using the sensing heating element composed of a fiber bragg grating temperature sensor and a ceramic heating tube. A discriminant index reflecting the cooling rate was defined to identify crack information according to the subsection characteristics of the heat source cooling curve, and the identification effects were analyzed and compared. The results showed that these three monitoring schemes could well judge whether there were cracks. In terms of crack location, the third scheme had a better effect. In terms of quantitative identification of crack width, the first scheme could not identify the crack width quantitatively, the second scheme could only identify the crack width in the flowing water environment, and the third scheme could identify the crack width according to the leakage flow.
文章编号:202101023     中图分类号:TV36;TH7    文献标志码:
基金项目:四川省自然科学基金项目(2022NSFSC0422);国家自然科学基金项目(51509174)
作者简介:第一作者:陈江(1982-),男,副教授,博士.研究方向:工程安全监测.E-mail:chxifei@126.com;通信作者:熊峰,教授,E-mail:fxiong@scu.edu.cn
引用文本:
陈江,熊杰,李宇驰,熊峰.基于热效应的涉水混凝土工程裂缝监测方法[J].工程科学与技术,2023,55(1):296-303.
CHEN Jiang,XIONG Jie,LI Yuchi,XIONG Feng.Crack Monitoring Method for Wading Concrete Engineering Based on Thermal Effects[J].Advanced Engineering Sciences,2023,55(1):296-303.