1.桂林理工大学土木工程学院,广西 桂林 541004
2.桂林理工大学广西岩土力学与工程重点实验室,广西 桂林 541004
刘翔宇(1999—),女,硕士研究生。主要从事地震动场地效应研究。E-mail: 1132237781@qq.com
兰景岩(1981—),男,教授,博士。主要从事岩土地震工程研究。E-mail: lanjy1999@163.com
收稿:2024-02-20,
修回:2024-04-01,
纸质出版:2025-08-28
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刘翔宇,兰景岩,咸甘玲等.桩土结构对软土地震动场地效应影响的离心模型试验研究[J].防灾减灾工程学报,2025,45(04):897-905.
LIU Xiangyu,LAN Jingyan,XIAN Ganling,et al.Centrifuge Model Test Study on Influence of Pile‑soil Structure Interaction on Ground Motion Site Effects in Soft Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):897-905.
刘翔宇,兰景岩,咸甘玲等.桩土结构对软土地震动场地效应影响的离心模型试验研究[J].防灾减灾工程学报,2025,45(04):897-905. DOI: 10.13409/j.cnki.jdpme.20240220002.
LIU Xiangyu,LAN Jingyan,XIAN Ganling,et al.Centrifuge Model Test Study on Influence of Pile‑soil Structure Interaction on Ground Motion Site Effects in Soft Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):897-905. DOI: 10.13409/j.cnki.jdpme.20240220002.
为探讨既有结构体系对地震动场地效应的影响,设计一组以软土地基桩基础为工程背景的动态离心模型试验,分别于近桩处和远桩处布置了加速度传感器列阵并获取试验记录,用以研究分析桩土结构体系和自由场的地震动场地放大响应,结合传统谱比法对比分析了近桩处与远桩处所在局部场地的基础频率、卓越频率及场地反应的差异。结果表明:①由于软弱介质对地震波的滤波作用,地震波由基底向地表传播的过程中,波形越来越稀疏,且各层位峰值加速度时刻均出了先减后增的趋势,并存在一定的滞后性;②由于桩土结构的存在,近桩处各层位峰值加速度略大于远桩处,而放大倍数小于远桩处;③桩土结构对局部场地的放大作用影响显著,同一土层位置,远桩局部场地的放大作用明显高于于近桩局部场地,但二者均在第二振型表现出了明显的放大作用;④随着场地土体层位变浅,各阵型下的场地放大反应并非是一直增加的,在某些振型下,近基底层位的场地放大反应要高于中间层位,小于近地表层位。
To explore the influence of existing structural systems on ground motion site effects
a series of dynamic centrifuge model tests with pile foundations in soft soil as the engineering background were designed. Accelerometer arrays were arranged at the near-pile and far-pile locations to collect test records
which were used to investigate and analyze the ground motion site amplification response of the pile-soil structural system and the free field. The traditional spectral ratio method was used to compare and analyze the differences in base frequency
predominant frequency
and site response between the near-pile and far-pile locations. The results showed that: (1) due to the filtering effect of the weak medium on seismic waves
as the waves propagated from the base to the surface
the waveforms became increasingly sparse
and the timing of peak acceleration at each layer showed a trend of first decreasing and then increasing
with a certain degree of hysteresis. (2) Due to the presence of pile-soil structure
the peak acceleration at each layer at the near-pile location was slightly larger than that at the far-pile location
while the amplification factor was smaller than that at the far-pile location. (3) The amplification effect of the pile-soil structure on the local site was significant. At the same soil layer
the amplification effect of local site at the far-pile location was significantly greater than that at the near-pile location
though both showed pronounced amplification effects in the second vibration mode. (4) As the soil layers of the site became shallower
the site amplification response did not always increase across all vibration modes. In certain modes
the amplification response near the base layer was higher than that in the intermediate layers
but lower than that in the near-surface layer.
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