浅埋偏压小净距隧道衬砌地震应变规律研究

发布时间：2019-02-19 21:20

【摘要】：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。
[Abstract]:The physical test model of shallow burying bias voltage with small clear distance tunnel with a ratio of 1:10 is designed and made, and a large shaking table test is carried out. The effects of the type of seismic wave and the peak value of acceleration on the strain response of tunnel lining with shallow bias voltage and small net distance are studied. The results show that under the condition of 0.1g and 0.2g, the tensile strain variation trend of the lining is similar and gentle, and the tensile strain variation trend of the lining is similar and fluctuant at the working conditions of 0.4g and 0.6g. The tensile strain is less affected by the type of seismic wave, but by the peak value of acceleration excitation of seismic wave, and increases with the increase of the peak value of acceleration. Large tensile strain will occur at the arch foot and the arch top of the lining. The tensile strain of the lining is larger than the compressive strain and the trend of the tensile strain is obvious. Under the action of different loading wave types and different acceleration excitation peaks, the strain variation trend shows obvious nonlinear variation characteristics. The results can provide a useful reference for the design and construction of shallow bias voltage and small clear distance tunnel.
【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(51204125,51404309)
【分类号】：U455.91

【相似文献】