[1]王会娟,王平,于一帆,等.复杂土层结构黄土场地地震动反应特性[J].自然灾害学报,2018,27(06):075-82.[doi:10.13577/j.jnd.2018.0610]
 WANG Huijuan,WANG Ping,YU Yifan,et al.The effect of complex soil structure loess field on earthquake ground motion[J].,2018,27(06):075-82.[doi:10.13577/j.jnd.2018.0610]
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复杂土层结构黄土场地地震动反应特性
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
27
期数:
2018年06期
页码:
075-82
栏目:
出版日期:
2018-12-28

文章信息/Info

Title:
The effect of complex soil structure loess field on earthquake ground motion
作者:
王会娟12 王平123 于一帆12 许书雅12 刘红玫12
1. 中国地震局 兰州地震研究所, 甘肃 兰州 730000;
2. 中国地震局黄土地震工程重点实验室, 甘肃 兰州 730000;
3. 西安理工大学 岩土工程研究所, 陕西 西安 710048
Author(s):
WANG Huijuan12 WANG Ping123 YU Yifan12 XU Shuya12 LIU Hongmei12
1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;
2. Key Laboratory of Loess Earthquake Engineering, CEA, Lanzhou 730000, China;
3. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China
关键词:
黄土场地振动台试验数值模拟放大效应
Keywords:
loess filedshaking table testnumerical analysisamplification effect
分类号:
X43;X9;TU443;P315.93
DOI:
10.13577/j.jnd.2018.0610
摘要:
基于复杂土层结构黄土场地的振动台缩尺模型试验,揭示了强震作用下场地的地震动响应规律;结合数值仿真模拟,分析了模型场地位移变化规律、地震波传播特征等。结果表明:(1)输入同一地震荷载情况下,峰值加速度(PGA)沿高程方向呈现递增趋势;同一监测点,PGA变化与地震动强度呈现正相关。(2)水平分量PGA大于垂直分量PGA;试验结果和计算所得PGA放大系数变化略有差异。(3)地表位移放大系数在2.5~3.5范围内变化;位移峰值的变化趋势与加速度峰值变化相似。(4)地震波传播速度变化与高程之间呈现负相关关系;在上覆土层厚度小于42.5 m的情况下,地震波传播速度受上覆土层厚度影响较小;地震波在该黄土场地传播的过程中,其水平分量速度较垂直分量速度递减明显。试验与计算结果对黄土场地建筑选址和抗震设防具有一定的参考意义。
Abstract:
Based on shaking table tests for scale model of complex structure loess field, it revealed that the seismic response law under seismic dynamic motion.Combined with numerical simulation, The law of displacement variation and seismic wave propagation characteristics of model site is analyzed. The results show that:(1)Under the same seismic load, the peak acceleration (PGA) shows an increasing trend along the elevation direction.At the same monitoring point, PGA change is positively correlated with ground vibration intensity.(2)The horizontal component PGA is greater than the vertical component PGA,there is a slight difference in the change of the PGA magnification coefficient between the test results and the calculated results (3)The surface displacement amplification coefficient varies from 2.5~3.5.The change trend of displacement peak is similar to that of acceleration peak.(4)There is a negative correlation between seismic wave propagation velocity and elevation,when the thickness of the overlying soil is less than 42.5 m, the velocity of seismic wave is less affected by the thickness of the overlying soil layer,In the course of the seismic wave propagation in the loess site, the velocity of the horizontal component is obviously lower than that of the vertical component.The results of the test and calculation have some reference significance to the site selection and seismic fortification of thecomplex structure loess field.

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备注/Memo

备注/Memo:
收稿日期:2018-09-17;改回日期:2018-10-09。
基金项目:甘肃省地震局科技发展基金项目(2015M01);甘肃省科技计划项目(18YF1FA101)
作者简介:王会娟(1992-),女,实习研究员,硕士,主要从事土动力学与地震工程研究.E-mail:1633487821@qq.com
通讯作者:王平(1977-),男,副研究员,硕士,主要从事土动力学与地震工程研究.E-mail:lanzhouwang_p@126.com
更新日期/Last Update: 1900-01-01