大坝混凝土温控防裂措施优化研究  

Optimization of Temperature Control and Crack Prevention Measures for Concrete Dam

作　　者：聂军洲 NIE Jun-zhou(Jinzhongtian Water Conservancy Construction Co.Ltd.,Guangzhou 510700,China)

机构地区：[1]金中天水利建设有限公司,广州510700

出　　处：《水利科技与经济》2022年第6期109-112,121,共5页Water Conservancy Science and Technology and Economy

摘　　要：混凝土材料是修建水利工程大坝的常用材料,但混凝土自身的材料属性决定了混凝土在温度变化时容易引起抗拉强度不足的拉裂缝。因此在水利工程中,避免或者减小温度控制的混凝土裂缝产生具有重要意义。以某一混凝土大坝为例,采用ANSYS有限元软件,模拟混凝土入仓温度以及表面保温措施对混凝温内部温度和应力的影响。数值结果表明,当入仓温度和环境温差小于5℃时,混凝土内部的第一主应力的最大值增加幅度比较有限;当温度差大于5℃,第一主应力的最大值增长速率较大,因此在实际应用中建议将温差控制在5℃之内,以减小混凝土开裂的可能性。采用2cm聚乙烯泡沫板作为混凝土表面的保温措施,可以有效保证混凝土表面拉应力小于混凝土极限抗拉强度,减小混凝土由于温度作用产生的拉裂缝。Concrete material is a common material to construct a hydraulic dam,but due to the material properties of the concrete,the concrete produces a pull-down slit that is insufficient to tensile strength during temperature changes.Therefore,in the water conservancy engineering,it is significant of avoiding or decreasing the temperature controlled concrete cracks.In this paper,a concrete dam is used as an example.The ANSYS finite element software simulates the effect of concrete entry temperature and surface insulation on the internal temperature and stress of the concrete.The numerical results show that when the positioning temperature and the ambient temperature difference are less than 5℃,the maximum increase in maximum increase in the first main stress in the concrete is relatively limited.When the temperature difference is greater than 5℃,the maximum growth rate of the first main stress is large,and therefore it is recommended to control the temperature difference within 5℃in the actual application.To reduce the possibility of concrete cracking.The insulation measures that use 2 cm polyethylene foam boards indicate that the surface stress of the concrete is smaller than the concrete limit tensile strength,and reduce the cracks produced by the condenser due to temperature.

关 键 词：混凝土坝 温度 表面保温措施 应力 

分 类 号：TU755[建筑科学—建筑技术科学]