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在基于性能的地震工程框架之下,地下洞室的地震稳定性评价方法可根据掌握难易程度、计算工作量、结果详尽程度划分为简化及精细两类方法。而当前对地下洞室的地震稳定性研究多针对动力数值方法,也即精细化分分析方法,而对简化设计方法设计较少。针对这一现状,引入拟静力形式的等代加速度法,对于等代加速度法应用于地下洞室群地震响应分析的一些问题进行了探讨。并在考虑洞室埋深和岩体性质的基础上,基于位移等效原则,通过数值试算,得到等代地震加速度修正系数的取值范围与回归公式。结果表明,当采用修正系数对利用等代地震加速度得到的结果进行修正后,与动力时程计算得到的结果吻合度较好。本文的研究内容为地下洞室地震稳定性的简化设计分析提供了一种新的思路。
Under the performance-based seismic engineering framework, the method of evaluating the seismic stability of underground caverns can be divided into simplified and refined methods based on how easy it is to master and how much work to be done. At present, the research on the seismic stability of underground caverns is mostly directed at the dynamic numerical method, that is, the refined sub-analysis method, while the design of simplified methods is less. In response to this situation, the pseudo-static equivalent acceleration method is introduced to investigate the problems of the equivalent acceleration method applied to the seismic response analysis of underground caverns. Based on the principle of displacement equivalent and considering the burial depth of the caverns and the nature of the rock mass, the range and regression formula of the acceleration correction coefficient of the equivalent generation are obtained through numerical tests. The results show that when the correction coefficient is used to correct the result obtained by using the equivalent earthquake acceleration, the result is in good agreement with the calculated result of dynamic time history. The research content of this paper provides a new idea for the simplified design and analysis of seismic stability of underground caverns.