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本文采用断裂力学的应力强度因子 K_I 作为分析砼坝施工期裂缝的稳定性指标,通过对年气温及寒潮的温度变化产生裂缝的稳定分析,得出了裂缝发生及扩展的趋势,从而为施工前期及几年后的裂缝现象提供了一个分析方法。本文还论及了由于砼浇筑中发生的如蜂窝、麻面等质量事故,增大了 K_I,促使裂缝不稳定。并阐述了为进一步完善温控设计,应该增加砼K_(IC)试验及计算砼各龄期遇各种寒潮 K_I 的必要性。
In this paper, the stress intensity factor K_I of fracture mechanics is used as an indicator to analyze the stability of concrete dam during construction period. Based on the stable analysis of the cracks caused by the temperature changes of the year and the cold wave, the occurrence and propagation of the cracks are obtained, And a few years after the crack provides an analytical method. This article also discusses the occurrence of such as concrete pouring, such as honeycomb, Ma face and other quality accidents, increased K_I, prompting crack instability. In order to further improve the design of temperature control, it is necessary to increase the test of concrete K_ (IC) and calculate the K_I of various cold spells at all ages.