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1.中冶建工集团有限公司,重庆 400080
2.重庆大学土木工程学院,重庆 400045
Published:15 October 2021
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魏奇科,韩亮,王振强等.双仓地下管廊抗震性能振动台试验研究∗[J].防灾减灾工程学报,2021,41(05):1052-1061.
WEI Qike,HAN Liang,WANG Zhenqiang,et al.Shaking Table Test Study on Seismic Performance of Double Box Underground Utility Tunnel[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):1052-1061.
魏奇科,韩亮,王振强等.双仓地下管廊抗震性能振动台试验研究∗[J].防灾减灾工程学报,2021,41(05):1052-1061. DOI: 10.13409/j.cnki.jdpme.201905019.
WEI Qike,HAN Liang,WANG Zhenqiang,et al.Shaking Table Test Study on Seismic Performance of Double Box Underground Utility Tunnel[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):1052-1061. DOI: 10.13409/j.cnki.jdpme.201905019.
借助振动台试验系统,应用El Centro原始地震波和不同频率正弦波开展了双仓地下综合管廊的相似模拟试验研究,模型中地基土为标准砂。结果表明:管廊侧壁最大动土压力响应沿深度呈倒立“W”形分布,并且在振动过后,管廊结构与周围土体之间的土压力场发生了改变;管廊侧壁沿深度最大加速度响应呈减小趋势,而随输入峰值加速度的增大而增大,由加速度响应时程曲线对比来看,管廊结构与其周边土体的运动模式基本一致;地震过程中结构角部的拉应变响应比各侧边中点更加剧烈,且随输入峰值加速度增大而增大;在15 Hz正弦波作用下, 场地和管廊结构组成的体系地震响应最显著,各测点之间的地震响应差异在此频率下也最为明显,反映出振动波频率特性对地下结构地震响应的影响规律。
With the help of the shaking table test system, similarity model tests were conducted for a double box underground utility tunnel under the original El Centro earthquake spectrum and sine waves with different frequencies, and the standard sand in Fujian Province was used to simulate the foundation soil. It is concluded that the maximum dynamic earth pressure has a reverse W-shaped distribution, and the earth pressure field has changed after the earthquake. In general, the maximum acceleration response decreases with an increasing depth and increases with the input PGA. With the comparison of the acceleration response spectrum between the structure and the surrounding soil, the motion pattern is basically in agreement with each other. During the earthquake, the maximum tensile strain response occurs at corners of the structure, which becomes larger with the increase of the input PGA, whereas the tensile strain is rather small at the middle part of each sidewall. Besides, it is revealed that the seismic responses and the differences of seismic responses between different measuring becomes points are the most significant under the sinusoidal wave of 15 Hz, which reflects the influence of frequency characteristics of shaking waves on the seismic responses of underground structures.
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