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基础贯穿裂缝是对重力坝危害最大的裂缝类型之一,如何控制基础温差、防止贯穿裂缝一直是重力坝设计、施工的一个重要课题。由于问题比较复杂,影响因素比较多,为了弄清客观规律,不但需要进行理论研究,而且需要总结有关的工程经验。刘家峡重力坝是一个基础块经历了高温差而未引起基础贯穿裂缝的实例。根据观测和计算,主坝15个基础浇筑块实际温差都超过了允许值,其中有12块实际温差达到或超过了30℃。这些情况不但引起了国内工程界,而且引起了到工地考察的外国人士的注意,国外对
The foundation through cracks is one of the types of cracks which are most harmful to the gravity dam. How to control the basic temperature difference and prevent the penetration through the cracks has always been an important issue in the design and construction of gravity dam. Due to the complexity of the issue and the many influencing factors, in order to understand the objective laws, we not only need to conduct theoretical research, but also summarize the relevant engineering experience. Liujiaxia gravity dam is an example of a base block experienced high temperature without causing the foundation through the cracks. According to the observation and calculation, the actual temperature difference of the 15 foundation pouring blocks of the main dam exceeded the allowable value, of which 12 actual temperature differences reached or exceeded 30 ℃. These situations not only aroused the domestic engineering community, but also attracted the attention of foreigners who visited the site.