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高拱坝在施工过程中需要对地基进行固结灌浆,灌浆分为有盖重灌浆和无盖重灌浆2种,对于有盖重灌浆来说,钻孔极其容易将冷却水管损坏,水管损坏对混凝土后期温度应力影响较大.采用热流耦合精细算法对施工期混凝土的温度应力进行仿真分析,结果表明:水管损坏后,大坝混凝土无法进行通水冷却,在较长的一段时期内,混凝土温度呈现不同程度的回升或缓慢降温.当混凝土达到一定的龄期需要进行接缝灌浆时,混凝土的温度依然较高,影响接缝灌浆的质量.如果以较高的温度进行封拱灌浆,那么在大坝运行期遇到温降工况时会在坝体内部产生比较大的温度残余应力.
In the process of construction, the high arch dam needs to consolidate and grout the foundation. The grouting is divided into two types, that is, heavy-weight grouting and uncovered grouting. For the heavy grouting, drilling is extremely easy to damage the cooling water pipe and water pipe damage. The temperature stress of concrete is greatly affected at the later stage.Using the thermo-fluid coupling algorithm to simulate the temperature stress of concrete during the construction period, the results show that the dam concrete can not be cooled by water, and the concrete temperature Showing a different degree of recovery or slow cooling.When the concrete reaches a certain age when the need for joint grouting, the concrete temperature is still high, affecting the quality of the joint grouting.If the sealing arch grouting at a higher temperature, then in Drought operating conditions encountered in the dam during the dam will have a relatively large temperature residual stress.