基于现场温度实验的混凝土浇筑初期裂缝产生机理及防裂措施  

Crack mechanism and prevention measures of concrete in initial pouring based on field temperature experiment

作　　者：张国新[1] 刘有志[1] 王振红[1] 李仁江[2] 李金桃[1] 

机构地区：[1]中国水利水电科学研究院结构材料所,北京100038 [2]中国长江三峡集团公司,湖北宜昌443000

出　　处：《水力发电学报》2013年第5期213-217,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学青年基金(50909105);材行业专项(201201050);中国水科院科研专项基金

摘　　要：针对干热河谷高温季节筑坝层间歇期间存在的裂缝问题,结合现场进行的温度梯度实验,采用精细模型及有限元仿真方法,反馈分析浇筑层间歇期间表层混凝土温度梯度变化及分布规律,由此获取真实温度梯度条件下混凝土内部温度应力的发展及变化过程,并弄清类似应力状态条件下混凝土层面可能的开裂隐患及裂缝出现的内在机理,最后探讨有效预防此类开裂风险的温控措施与方法,为干热河谷高温季节筑坝时避免此类裂缝提供参考。To study concrete cracking, a feedback analysis on variations of surface temperature gradient has been conducted for concrete at the intermission stage of layer pouring with a precise model and finite element simulation method combined with in-situ experiments of a dry hot valley dam. This paper presents the results of concrete stresses and their development under real concrete temperature gradient, and explores the internal crack mechanism and possible hidden cracks of the concrete. A discussion on effective measures for prevention of such cracking risk, particularly for construction of valley dams in a dry hot season, is also given. This work is of practical reference value for construction of concrete structure in dry hot valley.

关 键 词：水工结构 温度控制 有限元方法 大体积混凝土 温度梯度 初凝时间 

分 类 号：TV315[水利工程—水工结构工程]