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采用小概率法估计温度监控指标的目的是根据混凝土坝体抵御已经历过的温度荷载的能力来评估和预测抵御可能发生温度荷载的能力,以西南某在建混凝土拱坝第二期冷却(简称二冷)期间的温度监测资料为例,求得已灌区各浇筑仓二冷期间最大的降温速率后,采用小概率法拟定该坝二冷降温速率监控指标,以指导现场混凝土通水冷却措施。实践表明,当有足够多的二冷期间的温度监测资料时,采用小概率法拟定二冷期间降温速率监控指标是可行的。
The purpose of using small probability method to estimate temperature monitoring index is to evaluate and predict the ability of concrete dam against the temperature load that has been experienced to resist the possible temperature load. Based on the second phase cooling of a concrete arch dam under construction in southwest China Second cooling) during the second cooling period, the minimum cooling rate of each casting silo in the irrigated area was calculated. After that, a small probability method was used to draw up the monitoring index of the second cooling rate of the dam to guide the on-site concrete cooling measures. Practice shows that when there is enough temperature monitoring data during the second cooling period, it is feasible to use the small probability method to draw up the monitoring index of the cooling rate during the second cooling.