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清华大学学报(自然科学版)  2023, Vol. 63 Issue (7): 1050-1059    DOI: 10.16511/j.cnki.qhdxxb.2023.26.010
  论文 本期目录 | 过刊浏览 | 高级检索 |
安瑞楠1,3, 林鹏1, 陈道想1, 安邦2, 卢冠楠2, 林之涛4
1. 清华大学 水利水电工程系, 北京 100084;
2. 中交路桥建设有限公司, 北京 100027;
3. 火箭军研究院, 北京 100011;
4. 中清控(武汉)科技有限公司, 武汉 430074
Temperature gradient monitoring and thermal evolution of a super mass concrete structure
AN Ruinan1,3, LIN Peng1, CHEN Daoxiang1, AN Bang2, LU Guannan2, LIN Zhitao4
1. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;
2. Road & Bridge International Co., Ltd., Beijing 100027, China;
3. Rocket Force Academy, Beijing 100011, China;
4. TSCON(Wuhan) Technology Co., Ltd., Wuhan 430074, China
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摘要 该文依托广西龙门大桥锚碇填芯超大体积海工混凝土结构(58 606 m3),对连续浇筑期混凝土的温度梯度演化规律开展在线监测和真实温度场、应力分析,对混凝土结构的温控防裂具有重要意义。该文首先研发了温度梯度在线监测系统,可实现在线实时采集混凝土温度梯度变化数据,反馈实际温度与允许阈值间偏差功能,可为及时预警和精准温控提供依据;其次通过构建真实温度场并计算温度应力,揭示了在连续浇筑条件下超大混凝土结构的真实温度梯度演化规律,提出了温度开裂控制梯度指标。工程实践表明:温度梯度在线监测系统能保证现场精准动态温控方案较好地实施,从而有效控制开裂风险。研究成果可供同类工程温控防裂设计和施工参考。
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关键词 超大体积混凝土温度梯度在线监测连续浇筑真实温度场    
Abstract:[Objective] Bridge anchorage core concrete, a typical mass-filling marine concrete structure, faces challenges in temperature change control and crack prevention due to its special shape, continuous casting, and complicated boundary. [Methods] Based on the mass-filling concrete of the Guangxi Longmen Bridge anchorage basement (58 606 m3), this paper conducts an online monitoring and analysis of the real thermal field and stress distribution according to the evolution mechanism of the concrete temperature gradient during the pouring period. This work includes developing a temperature gradient digital monitoring system to provide feedback on the deviation from the actual value and provide a basis for timely warning and dynamically adjusted accurate temperature control, proposing the cracking control gradient index as the space and time gradient indices (a dimensionless index), and reconstructing the temperature field to the evolution of the real thermal field base on the temperature measurements in concrete, which is of great importance for the cracking control of the concrete structure. [Results] The main study results are as followed: (1) A major challenge in concrete cracking control was investigated according to complex structural properties, the continuous casting method, high temperature, high humidity, strong wind, and a high salt mist environment. (2) The monitoring data of the temperature gradient digital monitoring system indicated a certain difference in the temperature development in the center concrete and the area near the surface. The temperature in the concrete central area underwent a rapid increase and tended to be stable, stabilised temperature range of 53.60—54.50 ℃, and the temperature increase reached 88.16%—99.34% of the adiabatic temperature increase. The temperature near the concrete surface underwent a rapid increase and a slight decrease, peaking at 52.90 ℃. (3) The threshold values of the space gradient and time gradient indices were defined as -3.00—3.00 ℃/m and 0.002 h-1·m-1, respectively. The temperature gradient index met the threshold requirement, the horizontal and vertical spatial temperature gradients at the stable stage were -0.15—0.14 ℃/m and 0.29—1.08 ℃/m, respectively, and the time-temperature gradient was within 0.002 h-1·m-1. These results indicated that the concrete heat exchange process was performed as small temperature changes in time and space. (4) The temperature field reconstructed from the monitoring data revealed that the real temperature gradient characteristic of the mass-filling concrete and isotherms was dense near the pile foundation at 96 h, then gradually became sparse, and the time-temperature and space gradients gradually became uniform and remained uniform after 144 h. (5) The evolution of the real thermal field, from a nonuniform distribution to a uniform distribution, could be divided into three stages, i.e., thermal accumulation, thermal release, and thermal transfer. The concrete internal stress simulation indicated that the maximum tensile stress occurred at the stress concentration zone along the intersection of the circumferential pile foundation and was substantially affected by environmental temperature change. The maximum tensile stress value was 1 780.0 kPa, and the corresponding safety factor was 1.03, satisfying the design requirements. [Conclusions] A case study shows that the temperature gradient digital monitoring system successfully supports the dynamically adjusted temperature control and effectively controls the cracking risk. These study results can be used as a reference for the cracking control of similar projects.
Key wordssuper mass concrete    temperature gradient    online monitoring    continuous casting    real thermal field
收稿日期: 2022-11-02      出版日期: 2023-06-27
通讯作者: 林鹏,教授,     E-mail:
作者简介: 安瑞楠(1988—),女,博士研究生。
安瑞楠, 林鹏, 陈道想, 安邦, 卢冠楠, 林之涛. 超大混凝土结构温度梯度监测与温度场演化[J]. 清华大学学报(自然科学版), 2023, 63(7): 1050-1059.
AN Ruinan, LIN Peng, CHEN Daoxiang, AN Bang, LU Guannan, LIN Zhitao. Temperature gradient monitoring and thermal evolution of a super mass concrete structure. Journal of Tsinghua University(Science and Technology), 2023, 63(7): 1050-1059.
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