隧道侧墙大体积混凝土水化热及温控措施研究  

Study on Hydration Heat and Temperature Control Measures of Mass Concrete for Side Wall

作　　者：冯楚祥 李鹏飞 肖自强 王建民[1] FENG Chuxiang;LI Pengfei;XIAO Ziqiang;WANG Jianmin(School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo,Zhejiang 315211,China)

机构地区：[1]宁波大学土木工程与地理环境学院,浙江宁波315211

出　　处：《施工技术（中英文）》2023年第7期115-121,共7页Construction Technology

基　　金：国家自然科学基金(51878360,52178223);宁波市自然科学基金(202003N4136)。

摘　　要：对隧道侧墙进行现场温度监测,采用有限元软件ANSYS研究实际浇筑后温度场的时变规律,有限元模型与实测值吻合较好,验证了模型的准确性。为分析冷却水管在大体积混凝土中的作用,建立带管冷的模型进行有限元仿真分析,并对有无冷却水管的墙体温度场、应力场进行对比分析。结果表明:侧墙浇筑后温度变化趋势为先上升后下降,在第2~3天达到峰值,最高温度出现在结构中心点处,利用ANSYS软件进行数值仿真与工程实测吻合效果较好;未布置冷却水管时里表温差导致的最大温度应力大于抗拉强度,引起表面开裂,布设冷却水管显著降低水化热,与覆盖保温棉毡组成“内降外保”的温控措施能释放温度应力,抑制表面裂缝产生。The temperature change of the tunnel side wall during construction is monitored,and the finite element software ANSYS is used to simulate the temperature field.After studying the change law of temperature field,the finite element model is in good agreement with the measured results,which verifies the accuracy of the finite element model.Structural analysis is carried out to obtain the stress distribution.To analyze the function of cooling pipe in mass concrete,a finite element model of it is established for simulation analysis,the variation laws of temperature and stress are studied,and the temperature field and stress field of whether to arrange pipe cooling are compared and analyzed.The results show that the temperature change trend is first rising and then falling,reaching the temperature peak 2~3days after pouring,and the maximum temperature appears at the center point of the structure.The numerical simulation by ANSYS is in good agreement with the engineering measurement.When the cooling pipe is not arranged,the maximum temperature stress caused by internal and external temperature difference is greater than the tensile strength,resulting in the cracking of the surface.The arrangement of the cooling pipe can significantly reduce the hydration heat.The temperature control measure of“internal reduction and external protection”composed of thermal insulation cotton felt can release the temperature stress,inhibit the generation of surface cracks.

关 键 词：隧道 混凝土 水化热温度场 温度应力 监测 数值模拟 冷却水管 

分 类 号：TU755[建筑科学—建筑技术科学]