上覆海水层对自由场基本周期影响的离心模型试验研究

doi:10.11779/CJGE202104020

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摘要基于动态离心技术设计和构建了两组模型试验,还原并再现了上覆无水和有水的软土自由场仿真岩土台阵,利用白噪声扫频和强度不同的El Centro波作为振动台基底输入,采用考虑相消干涉的传统谱比法,获取了不同工况条件下的两组自由场模型的场地反应结果,通过对比分析有水和无水场地的振型反应特征以及基本周期差异,评价和总结上覆水在估算场地基本周期的作用及影响。研究结果表明：由于上覆水自重以及土水相互作用的影响,无水模型的地表峰值放大倍数要高于有水模型,同时无水模型的地表时程波形稀疏,表明地表地震波具有较为丰富的高频成分;无论是白噪声扫频还是El Centro波的基底加载方式,上覆无水和有水两组自由场模型的基本周期和振型放大系数均存在显著差异,表明上覆水对海底复杂介质体系的基本周期估算具有一定的影响,陆地模型和海域模型的基本周期最大偏差达35.5%。

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	兰景岩
	宋锡俊
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关键词 ：上覆海水, 场地基本周期, 传统谱比法, 动态离心模型试验

Abstract：Based on the dynamic centrifugation technique, two groups of model tests are designed and performed, and the geotechnical free field simulation arrays with and without water are restored and reproduced. The white noise sweep and El Centro waves with different intensities are used as the base input of the shaking table, and the traditional spectral ratio method considering cancellation interference is used to obtain the site response results of two groups of free field models under different working conditions. Through the comparative analysis of the modal response characteristics and basic period differences between watery and anhydrous sites, the function and influences of overlying water in estimating the basic period of the site are evaluated and summarized. The results show that due to the influences of the dead weight stress of overlying water, the surface peak magnification of the anhydrous model is higher than that of the watery model, and the surface time history waveform of the anhydrous model is sparse, indicating that the surface seismic waves have abundant high frequency components. Whether it is the white noise sweep or the base loading mode of El Centro wave, there are significant differences in the basic period and mode amplification factor of the two groups of free field models with and without water, indicating that the overlying water has a certain influence on the estimation of the basic period of the seafloor complex medium system, and the maximum deviation of the basic period of the land model and the sea model is 35.5%.

Key words： overlying sea water site basic vibration period traditional spectral ratio method dynamic centrifugal model test

收稿日期: 2020-06-01

ZTFLH:

TU471

基金资助:国家自然科学基金项目（51408559）; 广西自然科学基金项目（2018GXNSFAA281183）; 广西岩土力学与工程重点实验室开放基金项目（桂科能19-Y-21-4）

作者简介: 兰景岩(1981— ),男,黑龙江齐齐哈尔人,博士,副研究员,硕士生导师,主要从事岩土工程、土动力学及地震工程等方面的教学与科研工作。E-mail: lanjy1999@163.com。

引用本文:

兰景岩, 宋锡俊, 王婷. 上覆海水层对自由场基本周期影响的离心模型试验研究[J]. 岩土工程学报, 2021, 43(4): 768-775. LAN Jing-yan, SONG Xi-jun, WANG Ting. Centrifugal model tests on influences of overlying sea layer on basic period of free field. Chinese J. Geot. Eng., 2021, 43(4): 768-775.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE202104020 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2021/V43/I4/768

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