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针对大断面水工隧洞衬砌混凝土夏季施工很容易出现温度裂缝的问题,以溪洛渡水电站导流洞工程为例,采用ANSYS有限元软件模拟分析了不同温控工况下不同浇筑方式对衬砌混凝土的温控效果,并给出合理的温控方案。结果表明,采用一次浇筑难以满足温控防裂要求,而采用分期浇筑衬砌混凝土体的温度没有明显变化,但可有效降低各代表点最大拉应力,尤其是衬砌混凝土中间点的第一主应力,使衬砌混凝土满足抗裂安全要求。推荐温控方案可满足衬砌混凝土温控防裂要求,且安全富裕不是很大,相对来说也较经济。
Aiming at the problem that the temperature cracks easily occur in summer construction of large cross-section hydraulic tunnel lining concrete, taking the diversion tunnel project of Xiluodu hydropower station as an example, the finite element software ANSYS was used to simulate and analyze the influence of different pouring modes on lining concrete temperature Control effect, and gives a reasonable temperature control program. The results show that it is difficult to meet the requirements of temperature control and crack prevention by one pouring. However, the temperature of the concrete slab by pouring has no obvious change, but the maximum stress of each representative point can be effectively reduced, especially the first principal stress of lining concrete, Lining concrete to meet the cracking safety requirements. Recommended temperature control program to meet the lining concrete temperature control cracking requirements, and security is not large, relatively speaking, more economical.