深厚第四纪沉积土非线性性能对地表地震动特性的影响

刘薛宁; 陈国兴; 任炜; 金丹丹; 许汉刚

doi:10.13409/j.cnki.jdpme.2020.04.003

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深厚第四纪沉积土非线性性能对地表地震动特性的影响

更新时间：2025-09-25

- 深厚第四纪沉积土非线性性能对地表地震动特性的影响
- Influence of Nonlinear Behavior of Quaternary Deep Sediment Layers on the Characteristics of Surface Ground Motions
- 防灾减灾工程学报 2020年40卷第4期页码：498-508
- 作者机构：
  
  1.南京工业大学岩土工程研究所, 江苏南京 210009
  2.江苏省土木工程防震技术研究中心，江苏南京 210009
  3.江苏大学土木工程与力学学院，江苏镇江 212013
  4.江苏省地震局，江苏南京 210014
- 作者简介：
  
  刘薛宁（1992-），男，博士研究生。主要从事场地地震效应的研究。Email: 837450818@qq.com
  陈国兴（1963-），男，教授，博士。主要从事土动力学与岩土地震工程的研究。Email: gxc6307@163.cn
- 基金信息：
  
  国家自然科学基金项目(51378258);江苏省自然科学基金青年基金项目(BK20150512)
- DOI：10.13409/j.cnki.jdpme.2020.04.003
  中图分类号： TU443
- 收稿：2018-07-09，
  
  修回：2018-08-09，
  
  纸质出版：2020-08-15
- 稿件说明：
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刘薛宁,陈国兴,任炜等.深厚第四纪沉积土非线性性能对地表地震动特性的影响[J].防灾减灾工程学报,2020,40(04):498-508.

LIU Xuening,CHEN Guoxing,REN Wei,et al.Influence of Nonlinear Behavior of Quaternary Deep Sediment Layers on the Characteristics of Surface Ground Motions[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):498-508.
刘薛宁,陈国兴,任炜等.深厚第四纪沉积土非线性性能对地表地震动特性的影响[J].防灾减灾工程学报,2020,40(04):498-508. DOI： 10.13409/j.cnki.jdpme.2020.04.003.

LIU Xuening,CHEN Guoxing,REN Wei,et al.Influence of Nonlinear Behavior of Quaternary Deep Sediment Layers on the Characteristics of Surface Ground Motions[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):498-508. DOI： 10.13409/j.cnki.jdpme.2020.04.003.

摘要

土体非线性性能对地表地震动的影响主要体现在其频谱成分和强度的改变上。采用修正Matasovic本构模型描述土的动力非线性特性，利用专业软件DeepSoil对深厚场地的50个钻孔剖面土柱模型进行了场地地震反应分析。采用加速度反应谱卓越周期

、平均谱周期

avg

及加速度傅氏谱平均周期

表征地表地震动频谱特性；以Arias强度

和地表峰值加速度PGA表征地表地震动强度。结果表明：(1) 特定场地条件下，

不能反映土体非线性对地震动从基岩传播至地表时频谱成分变化的影响；

avg

和

在表征地震动频谱成分特性时具有较高的一致性；(2) 基岩地震动高频丰富时，

avg

和

随着基岩地震动峰值加速度的增大而呈现出线性增长的趋势；而基岩地震动低频较发育时，

avg

和

的增长趋势线存在明显的拐点；（3）PGA与

值随基岩地震动峰值加速度的增大呈现出基本一致的非线性增长趋势，且其离散性均随基岩峰值加速度的增大而增大。

Abstract

The nonlinearity of soil has a great influence on the spectral characteristics and intensity of ground motions. The modified Matasovic model is accepted to well characterize the nonlinear behavior of soil. The profile soil models of 50 boreholes for the quaternary deep sediment layers are established for site seismic response based on software DeepSoil. The predominant period

average spectral period Tavg of the acceleration response spectrum and the mean period

of the Fourier amplitude spectrum of an acceleration time history are employed as the proxy to characterize the spectral characteristics of surface ground motions. The ground motion intensity is characterized by the Arias strength Ia and the peak ground acceleration (PGA). The results show that: (1)

doesn't characterize the changes of seismic motions spectral characteristics during the seismic wave propagating from bedrock to surface ground. Tavg and Tm have a good similarity in characterizing the spectral characteristics of seismic motions. (2) When the seismic bedrock motions are rich for high frequency components

Tavg and Tm show a linear growth trend with increasing peak bedrock acceleration. However

there are inflection points in the growth trend lines of Tavg and

if the seismic bedrock motions are rich in low frequency components. (3) The nonlinear generation rates of PGAs and Ia with increasing peak bedrock acceleration are essentially consistent

and the values of PGAs and Ia show much greater dispersion with increasing peak bedrock accelerations.

关键词

Keywords

references

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