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Influence of Seismic Loading on Segment Opening of a Shield Tunnel

机译：地震荷载对盾构隧道管片开口的影响

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摘要

The influence of seismic loading on segment opening of a shield tunnel was explored using the dynamic finite element method to analyze the distribution of segment opening under multidirectional seismic loading, combined with a typical engineering installation. The calculation of segment opening was deduced from equivalent continuous theory and segment opening was obtained through calculations. The results show that the scope of influence of the foundation excavation on segment opening is mainly resigned to within 5 segment rings next to the diaphragm wall and 4 joints nearest the working well when the tunnel is first excavated followed by the working well in the excavation order. The effect of seismic loading on segment opening is significant, and the minimum increase of the maximal segment opening owing to seismic loading is 16%, while that of the average opening is 27%. Segment opening under bidirectional coupled seismic loading is significantly greater than that under one-dimensional seismic loading. On the basis of the numerical calculations, the seismic acceleration and segment opening caused by seismic action were normalized, and a new calculation method was proposed for predicting the maximal segment opening of a shield tunnel at different depths under conditions of seismic loading.
机译：结合典型的工程装置，采用动力有限元方法，分析了多向地震荷载作用下分段开口的分布，探讨了地震荷载对盾构隧道分段开口的影响。从等效连续理论推导了扇形段的开度计算，并通过计算得到了扇形段的开度。结果表明，在开挖隧道时，基坑开挖对分段开度的影响范围主要集中在紧邻隔板壁的5个分段环内，以及最靠近工作井的4个节理，然后依次开挖工作井。 。地震荷载对分段开口的影响是显着的，并且由于地震荷载，最大分段开口的最小增加为16％，而平均开口的最小增加为27％。双向耦合地震荷载作用下的分段开度明显大于一维地震荷载作用下的分段开度。在数值计算的基础上，归一化了地震加速度和地震作用引起的断面开度，提出了一种新的计算方法，用于预测地震荷载作用下不同深度的盾构隧道的最大断面开度。

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