基于大型振动台试验的浅埋偏压隧道橡胶减震层减震效果研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (20) : 192-199.

论文

基于大型振动台试验的浅埋偏压隧道橡胶减震层减震效果研究

江学良1,2，杨慧1,2 ，喻雷2,3，覃诗卉2，沈搏2，王浩冬2,林杭4

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A study on the seismic effect of the rubber damping layer in a shallow-buried and unsymmetrial pressure tunnel based on a shaking table test

JIANG Xueliang1,2,YANG Hui1,2,YU Lei2,3,QIN Shihui2,SHEN Bo2,WANG Haodong2，LIN Hang4

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摘要

通过几何相似比1：20的有无橡胶减震层的浅埋偏压隧道大型振动台物理模型试验，研究了橡胶减震层对隧道衬砌加速度和应变减震系数的变化规律，评价了浅埋偏压隧道橡胶减震层的减震效果。研究结果表明：（1）橡胶减震层不改变仰拱处加速度时程曲线的变化趋势，但显著降低了其水平和竖向加速度响应峰值。不论地震波类型、地震激振强度和隧道衬砌位置，橡胶减震层都能显著降低水平和竖向加速度响应。（2）不论地震波类型和激振强度，隧道衬砌左拱肩的水平和竖向加速度减震系数要比右拱肩大不少，这与隧道处于偏压状态有关。地震波类型对水平加速度减震系数的影响要大于对竖向加速度减震系数的影响。（3）加速度减震系数与地震激振强度不存在显著的相关性，但从趋势上看，激振强度增加，减震系数有减小趋势。（4）不论地震波类型、地震激振强度和衬砌位置，橡胶减震层都具有显著的最大主应变和最小主应变减小作用。衬砌最大和最小主应变减震系数与激振强度之间不存在显著的相关关系，但整体上看，减震系数有随激振强度减弱的趋势。（5）橡胶减震层在浅埋偏压隧道中能发挥优良的减震效果，其减震效果与地震强度、减震层材料参数和应力环境密切相关。研究结论可为橡胶减震层在隧道工程中的应用提供一定的参考作用。

Abstract

Based on the shaking table model tests of a shallow-buried and unsymmetrial pressure tunnel with and without rubber damping layer whose geometric similarity ratio is 1:20, the damping coefficient change laws of rubber damping layer on the tunnel lining’s acceleration and strain were studied and the seismic reduction effect of the rubber damping layer were evaluated. The research conclusion is as follows. (1) The rubber damping layer does not change the trend of the acceleration time history curve at the inverted arch, but significantly reduces its peak horizontal and vertical acceleration response. Regardless of the type of seismic wave, the intensity of seismic excitation, and the location of the tunnel lining, the rubber damping layer can significantly reduce the horizontal and vertical acceleration re-sponse.(2)Regardless of the type of seismic wave and excitation intensity, the horizontal and vertical acceleration damping coefficients of the left arch shoulder of the tunnel lining are much larger than those of the right arch shoulder, which is related to the tunnel being in an eccentric compression state. The impact of seismic wave types on the horizontal ac-celeration damping coefficient is greater than that on the vertical acceleration damping coefficient. (3)There is no significant correlation between the acceleration damping coefficient and the seismic excitation intensity, but from a trend perspective, as the excitation intensity increases, the damping coefficient tends to decrease. (4)Regardless of the type of seismic wave, the intensity of seismic excitation, and the location of the lining, the rubber damping layer has a significant reduction effect on the maximum and minimum principal strains. There is no significant correlation between the maximum and minimum principal strain damping coefficients of the lining and the excitation strength, but overall, the damping coefficient shows a trend of weakening with the excitation strength. (5)The rubber damping layer can play an excellent damping effect in shallow-buried and unsymmetrial pressure tunnel, and its damping effect is closely related to seismic strength, material parameters of the damping layer, and stress environment. These conclusions can provide a certain reference for the application of rubber damping layer in tunnel engineering.

导出引用

江学良1, 2, 杨慧1, 2, 喻雷2, 3, 覃诗卉2, 沈搏2, 王浩冬2, 林杭4. 基于大型振动台试验的浅埋偏压隧道橡胶减震层减震效果研究[J]. 振动与冲击, 2024, 43(20): 192-199

JIANG Xueliang1, 2, YANG Hui1, 2, YU Lei2, 3, QIN Shihui2, SHEN Bo2, WANG Haodong2, LIN Hang4. A study on the seismic effect of the rubber damping layer in a shallow-buried and unsymmetrial pressure tunnel based on a shaking table test[J]. Journal of Vibration and Shock, 2024, 43(20): 192-199

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