空间小净距交叉隧道动力响应振动台试验研究

雷浩1,2,3,吴红刚2,钱建固1,赖天文3,纪志阳3,梁彧3

振动与冲击 ›› 2023, Vol. 42 ›› Issue (5) : 92-100.

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (5) : 92-100.
论文

空间小净距交叉隧道动力响应振动台试验研究

  • 雷浩1,2,3,吴红刚2,钱建固1,赖天文3,纪志阳3,梁彧3
作者信息 +

Shaking table tests for dynamic responses of crossing tunnels with small space clearances

  • LEI Hao1,2,3, WU Honggang2, QIAN Jiangu1, LAI Tianwen3, JI Zhiyang3, LIANG Yu3
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文章历史 +

摘要

为研究空间小净距交叉隧道在地震荷载作用下的动力响应,开展了相似比为1:50的振动台模型试验,设计并加载了5种工况水平向El-Centro地震波,通过采集的试验数据对隧道动应变响应进行了分析,并对交叉段及非交叉段围岩的加速度响应进行了对比研究,在此基础上使用反应谱理论对其动力特性与地震动之间的关系进行探讨。试验结果表明:上跨隧道的应变峰值均大于下穿隧道,同时上跨隧道的存在及围岩的挤密效应减弱了地震波对于下穿隧道的冲击作用;地震荷载作用下空间交叉隧道的动力响应具有一定的“滞后性”,上跨隧道的震害破坏出现时间较早且更为严重;围岩内部各测点的加速度放大效应都沿高程方向表现出显著的峰值特征,非交叉段的加速度响应在靠近上跨隧道拱顶处最为强烈,而交叉段却出现在靠近下穿隧道拱顶处;坡体各测点位移反应谱的幅值随输入地震波幅值的增大而逐渐增大,且卓越周期也随之增大,即卓越频率逐渐减小;弱震(0.1g)作用下,短周期(0.5~1.5 s)内反应谱曲线具有显著的峰值特征,而强震(0.6g)作用下,长周期(3.0~5.0 s)内反应谱曲线沿高程具有明显的放大效应。

Abstract

To study the dynamic response of the 3d cross tunnel with small distance under the action of seismic loading, a shaking table model test with a similarity ratio of 1:50 was carried out. The experiment was designed and loaded with horizontal El-Centro seismic waves under 5 working conditions. The dynamic strain response of the tunnel was analyzed by collected test data, and the acceleration response of the intersecting and non-intersecting sections of the surrounding rock was compared and studied. Furthermore, the response spectrum theory was used to study the dynamic relationship between tunnel structure and ground motion. The test results showed that: the hoop and axial strain peaks of the upper-span tunnel are larger than those of the under-crossing tunnel. Owing to the influence of the upper-span tunnel and the compacting effect of surrounding rock, the impact of seismic waves on the under-crossing tunnel is weakened. The dynamic response of space crossing tunnel under seismic load has a certain " hysteresis ", and the seismic damage of upper-span tunnel occurs earlier and more serious. The acceleration amplification effect along the elevation direction of measuring points shows significant peak characteristics. Additionally, the acceleration response of the non-intersection is the strongest near the crown of the upper-span tunnel, while the intersection appears at the crown of the under-crossing tunnel. Furthermore, the amplitude of displacement response spectrum of each measuring point increases gradually with the increase of input seismic amplitude, and the predominant period also increases, that is, the predominant frequency decreases gradually. The response spectrum curves in the short period (0.5~1.5 s) under the action of low earthquakes (0.1g) have significant peak characteristics, while the response spectrum curves in the long period (3.0~5.0 s) under the action of strong earthquakes (0.6g) have obvious amplification effects along the elevation.

关键词

隧道工程 / 空间交叉隧道 / 振动台试验 / 地震响应 / 反应谱响应

Key words

tunnel engineering / spatial cross tunnel / shaking table test / seismic response / response spectrum theory

引用本文

导出引用
雷浩1,2,3,吴红刚2,钱建固1,赖天文3,纪志阳3,梁彧3. 空间小净距交叉隧道动力响应振动台试验研究[J]. 振动与冲击, 2023, 42(5): 92-100
LEI Hao1,2,3, WU Honggang2, QIAN Jiangu1, LAI Tianwen3, JI Zhiyang3, LIANG Yu3. Shaking table tests for dynamic responses of crossing tunnels with small space clearances[J]. Journal of Vibration and Shock, 2023, 42(5): 92-100

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