偏压隧道模型振动台试验与数值模拟研究

发布时间：2018-01-26 17:59

本文关键词： 振动台模型试验偏压隧道加速度响应 MIDAS/NX数值分析　出处：《振动工程学报》2017年04期 　论文类型：期刊论文

【摘要】：根据动力模型试验相似关系,设计了一个比尺为1∶10的偏压隧道模型,开展大型振动台模型试验,研究地震作用下偏压隧道加速度动力响应规律,模型试验以汶川波作为输入波,采用水平(X)向、竖直(Z)向和水平竖直(XZ)双向3种加载方式。利用MIDAS/NX有限元软件进行数值模拟,并与模型试验结果对比分析。研究表明:衬砌测点的加速度时程曲线与输入地震波特征相似,卓越频段和傅氏谱谱值都增大。X向激振时,加速度放大效应不明显且放大系数随激振幅值的增大而略有减小;竖向波对衬砌加速度动力响应影响明显大于水平地震波,表现为加速度放大效应显著;XZ双向激振时,相比于单向波而言测点加速度放大系数有增大、也有减小,与测点位置有关,临近边坡侧测点竖向加速动力响应较大,非偏压侧拱脚和拱顶是抗震设计的重点;数值模拟与试验结果在变化趋势上相近,数值上拟合程度高,在输入Amax0.2g时,模拟结果误差较小,随输入加速度峰值的增大误差增大。
[Abstract]:According to the similarity relation of dynamic model test, a bias tunnel model with a scale of 1:10 is designed, and a large-scale shaking table model test is carried out to study the dynamic response law of the bias tunnel acceleration under earthquake. The model test takes Wenchuan wave as input wave, adopts three loading modes: horizontal X), vertical ZZ) and horizontal vertical XZ). The numerical simulation is carried out by using MIDAS/NX finite element software. The results are compared with the model test results. The results show that the acceleration history curve of the linings is similar to that of the input seismic waves, and the excellent frequency band and the Fourier spectrum increase when the excitation is in the direction of .X-direction. The acceleration amplification effect is not obvious and the magnification coefficient decreases slightly with the increase of the exciting amplitude. The influence of vertical wave on the dynamic response of lining acceleration is obviously greater than that of horizontal seismic wave, and the acceleration amplification effect is obvious. When XZ is excited in both directions, the acceleration magnification factor of the measured point increases and decreases compared with the unidirectional wave, which is related to the location of the measuring point, and the vertical acceleration dynamic response of the measuring point near the slope is larger. Unbiased side arch foot and arch roof are the key points of seismic design. The variation trend of numerical simulation is similar to that of experimental results, and the degree of numerical fitting is high. When Amax0.2g is input, the error of simulation results is small, and the error increases with the increase of the peak value of input acceleration.
【作者单位】：中南林业科技大学土木工程与力学学院;中南林业科技大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(51204125)
【分类号】：U451.5
【正文快照】： 引言中国西部地区地形条件复杂,多以山地、高原为主,随着西部大开发战略的持续推进,隧道作为一种重要的交通构筑物形式,在丘陵、山区、斜坡地段公路、铁路建设和地下空间开发利用过程中,经常会出现偏压的形式。近年国内地震频发,2008年汶川大地震造成大量隧道工程破坏[1-2],其

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