基于实际通水监测的大体积混凝土数字温度监测

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清华大学辅仁网/2017-07-07

左正¹,胡昱¹(

),李庆斌¹,李炳锋^2,³,黄涛¹

2. 中国长江三峡集团公司, 北京 100038
3. 深圳蓄能发电有限公司, 深圳 518115

Temperature monitoring during concrete setting through cooling pipe monitors

Zheng ZUO¹,Yu HU¹(

),Qingbin LI¹,Bingfeng LI^2,³,Tao HUANG¹

1. State Key Laboratory of Hydroscience and Engineering,Tsinghua University, Beijing 100084, China
2. China Three Gorges Corporation, Beijing 100038, China
3. Shenzhen Pumped Storage Power Co. Ltd,Shenzhen 518115, China

摘要:

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摘要大体积混凝土施工期的温度状态是重要的评价指标,对其的获知传统上依赖于埋设内部温度计,但存在耗费资源、施工干扰、仪器失效等问题。该文提出一种数字监测方法,通过布置一定的通水仪器,利用能量守恒定律计算混凝土的温度状态,规避了传统算法中对参数选取的复杂性。对相关的计算原理进行了推导,并给出了仪器布置及监测的方法。在溪洛渡拱坝工程中分别针对单仓及全坝段进行了数字监测试验,数字监测结果与原型监测结果一致,验证了所提方法的可行性与正确性。

关键词 ：水工结构,数字监测,温度场,冷却通水

Abstract：Temperature is an important indicator to evaluate the concrete after it has been build. Traditionally, the concrete temperature is monitored by embedded sensors, but placing these is not convenient during pouring and the sensors can fail. A calculational method that does not need embedded sensors was developed where the concrete temperature field is determined from measured cooling flow temperatures. The mathematical model, instrument layout and monitoring procedure are described in this paper. Predicted temperatures for a domestic large arch dam project compare well with actual measurements to validate the applicability of the method.

Key words：hydraulic structures numerical monitoring temperature field pipe cooling

收稿日期: 2013-06-03 出版日期: 2015-05-15

基金资助:国家 “九七三” 重点基础研究项目 (2013CB035902);国家自然科学基金资助项目 (51279087);清华大学水沙科学与水利水电工程国家重点实验室科研课题资助项目(2012-KY-4)

引用本文:

左正,胡昱,李庆斌,李炳锋,黄涛. 基于实际通水监测的大体积混凝土数字温度监测[J]. 清华大学学报（自然科学版）, 2015, 55(1): 21-26.
Zheng ZUO,Yu HU,Qingbin LI,Bingfeng LI,Tao HUANG. Temperature monitoring during concrete setting through cooling pipe monitors. Journal of Tsinghua University(Science and Technology), 2015, 55(1): 21-26.

链接本文:

http://jst.tsinghuajournals.com/CN/或 http://jst.tsinghuajournals.com/CN/Y2015/V55/I1/21

图表:

水管布置及测温

数字监测系统流程图

实际工程中的水表与水龙头

材料参数	取值
比热容c_c/(kJ·kg^-1·℃^-1)	0.985
密度ρ_c/(kg·m-3)	2 663.0
导热系数λ/(kJ·m^-1·h^-1·℃^-1)	7.70
散热系数β/(kJ·m-2·h^-1·℃^-1)	41.8

材料参数

冷却通水吸收热量速率

数字监测与原型监测对比

大坝数字监测温度与原型监测对比

工况	时间/s
单仓200d	36.38
单坝段225d	552.16
全坝段600d	10 226.00
全坝段1 560d	31 783.52

数字温度监测CPU时间

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