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“大跨度”岩洞在施工开挖稳定性和国防工程抗爆能力与“小跨度”岩洞不同,设计时对“大跨度”岩洞仍沿用“中小跨度”的设计方法,其计算结果显然与实际情况不相符合,甚至导致危险发生,但国内外规范中对于“大跨度”也没有给出一致的定义。为了弥补规范中大跨度岩洞设计的不足,从工程类比法、规范法、力学划分三方面对不同跨度岩洞进行讨论:分析了国内外600多个已建洞库的跨度和各类规范中洞库跨度的适用范围,得到“大跨度”区别于“小跨度”岩洞的界定标准;利用LS-DYNA有限元程序对不同跨度岩洞的静力和动力力学特性进行分析,探讨了洞库的跨度效应;通过分析跨度效应,对现有设计规范提出修正建议。
“Large span ” cave in the construction of excavation stability and national defense engineering antiknock ability and “small span ” cave is different from the design of “long span ” cave still use “small span ” design method , The calculation result obviously does not accord with the actual situation and even leads to the danger. However, there is no consistent definition for “long-span ” in domestic and foreign norms. In order to make up for the shortcomings of long-span caverns in the code, this paper discusses the caverns with different span from the aspects of engineering analogy, standard method and mechanics division. It analyzes the span of more than 600 domestic and foreign caverns and various kinds of standard caverns The scope of application of “span” is defined as “big span” which is different from that of “small span” caves. The static and dynamic mechanical characteristics of caves with different span are analyzed by LS-DYNA finite element program. Span effect of the existing design code by analyzing the span effect.