断层走向对隧道地震响应影响的振动台试验研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (21) : 196-202.

论文

刘礼标1，王永甫2，刘方1，周杰1

作者信息 +

Study of shaking table model test of fault strike on the seismic response of tunnels

LIU Li-biao1, WANG Yong-fu2, LIU Fang1, ZHOU Jie1

Author information +

文章历史 +

摘要

为探讨不同断层走向下隧道在地震作用时的响应规律及破坏机理，开展了振动台模型试验及数值分析，研究了隧道的加速度反应、动应变及围岩动土压力的变化规律和隧道的动态破坏形态。分析结果表明：地震下隧道衬砌将受较大的拉、压作用，尤其穿越断层处隧道衬砌张拉裂缝分布数量多、复杂，多集中于拱脚、拱肩和仰拱；隧道各部位的加速度和动应变的时程变化规律与输入的地震加速度时程曲线基本保持一致，说明隧道在地震过程中保持整体运动性，但断层对地震动力反应具有一定的放大效应，且随着断层走向与隧道夹角减小而更加明显；动土压力伴随地震荷载作用呈现动力时程变化规律，动土压力幅值整体呈“两侧大、顶底小”的规律，且断层走向对隧道动土压力影响较大。研究结果可为隧道的抗震设计和施工提供参考，具有重要的实际工程意义。

Abstract

To reveal the response and damage mechanism of a tunnel through the different fault strike under earthquake, a shaking table model test and numerical analysis were introduced. The research focuses on the acceleration, the strain, earth pressure and fracture patterns of the tunnel. The test results show that the tunnel lining is subjected to large tension and compressive stress, most complex and wider cracks of the lining occurred concentrated on the spandrel, arch foot and invert arch when the tunnel cross the fault zone. The change law of acceleration and dynamic strain along the tunnel are similar in every point, show that the tunnel is a unity, but the seismic dynamic response has significant amplification effect when the tunnel cross the fault zone, and the more obvious with the angle decrease of the fault strike and tunnel. The dynamic earth pressure curves show the value and direction changed with the seismic loads, the amplitude of the dynamic earth pressure is the rules of the big on the both sides and the small on the top floor. This paper can provide references on the earthquake resistant design and construction of practical projects, which has an important practical engineering significance.

导出引用

刘礼标1，王永甫2，刘方1，周杰1. 断层走向对隧道地震响应影响的振动台试验研究[J]. 振动与冲击, 2017, 36(21): 196-202

LIU Li-biao1, WANG Yong-fu2, LIU Fang1, ZHOU Jie1. Study of shaking table model test of fault strike on the seismic response of tunnels[J]. Journal of Vibration and Shock, 2017, 36(21): 196-202

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