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设计并制作了比例为1∶10的浅埋偏压小净距隧道物理试验模型,并开展了大型振动台试验,研究了地震波类型及加速度激振峰值对浅埋偏压小净距隧道衬砌应变响应规律的影响。研究结果表明:在0.1g与0.2g的工况下,衬砌的拉应变变化趋势较为相近且平缓;在0.4g与0.6g的工况下,衬砌的拉应变变化趋势较为相近且波动较大。拉应变受地震波类型的影响较小,而受地震波加速度激振峰值的影响较明显且随着加速度激振峰值增大而增大。在衬砌拱脚及拱顶处会产生较大的拉应变。衬砌的拉应变大于压应变且拉应变的变化趋势较为明显。在不同的加载波类型和不同的加速度激振峰值作用下,应变变化趋势呈现明显的非线性变化特征。研究结果可为浅埋偏压小净距隧道的设计与建设提供有益参考。
The physical experiment model of shallow buried shallow tunnel with a ratio of 1:10 was designed and fabricated and a large-scale shaking table test was carried out. The influence of seismic wave types and peak acceleration on the tunnel lining strain The impact of the law of response. The results show that under 0.1g and 0.2g conditions, the tendency of tensile strain of lining is similar and gentle. Under 0.4g and 0.6g conditions, the tendency of tensile strain of lining is similar and fluctuates greatly. The tensile strain is less affected by the type of seismic waves, but is more affected by the peak of seismic acceleration acceleration and increases with the increase of acceleration excitation peak. Lining arch and the arch will have a greater tensile strain. Lining tensile strain greater than the compressive strain and tensile strain change trend is obvious. Under different loading wave types and different acceleration excitation peaks, the trend of strain change shows obvious nonlinear variation. The research results can provide useful reference for the design and construction of the tunnel with shallow bias and small spacing.