规范中的拱坝结构设计安全度并不完全代表拱坝结构的实际安全度,两者之间存在一定的差异,从而造成业界难以合理认识拱坝安全度的真实水平。结合国内数座已建、在建特高拱坝相关资料,基于多拱梁法,通过拱坝混凝土实际强度这一影响因子的探讨及修正,以及大坝结构最大可能应力的修正,推导出了拱坝结构的实际可能安全度。分析认为,当前规范对应的安全控制标准可以确保拱坝结构实际安全度大于1.0,实际安全裕度是较为合理可靠的。
Abstract
The safety factor of arch dam, which is an important standard of dam safety evaluation, shows a great disparity between design value and actual value. In order to rationally identify the ral safety condition of arch dam, a large number of high arch dam projects are discussed. An estimation formula of the actual possible safety factor of arch dam is derived by correcting the actual strength of concrete and the maximum possible stress of dam structure by using multi-arch beam method. Results demonstrates that the actual safety factor could be guaranteed to be larger than 1.0, which indicates a rational safety margin. The design safety factor could achieve the real security requirements.
关键词
结构安全度 /
真实应力 /
多轴效应 /
特高拱坝
Key words
safety factor /
actual stress /
multiaxial strength of concrete /
arch dam
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参考文献
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