Effects of near-fault ground motion on seismic response of underground cacerns

CUI Zhen; SHENG Qian; LENG Xian-lun; LIU Xiao-min; FENG De-ding

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Effects of near-fault ground motion on seismic response of underground cacerns

更新时间：2026-06-25

- Effects of near-fault ground motion on seismic response of underground cacerns
- Vol. 34, Issue 11, (2013)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉,430071
  2. 中国水电顾问集团华东勘测设计研究院,杭州,310014
- 作者简介：
- 基金信息：
- DOI：
  CLC： TV745
- Online First：11 November 2013，
  
  Published：2013
- 稿件说明：
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CUI Zhen, SHENG Qian, LENG Xian-lun, et al. Effects of near-fault ground motion on seismic response of underground cacerns[J]. 2013, 34(11).
DOI：

CUI Zhen, SHENG Qian, LENG Xian-lun, et al. Effects of near-fault ground motion on seismic response of underground cacerns[J]. 2013, 34(11). DOI：

摘要

针对现行水工抗震规范中对近断层地震缺乏考虑这一实际问题，首先讨论了近断层、远场地震动的差别，对比了近断层、远场地震动对地下洞室地震响应的影响，继而提出一种新的人工合成近断层地震动时程的方法，并采用合成的近断层地震动时程对某水电站地下洞室群进行了近断层地震稳定性专门研究。结果表明：与常规地震分析中考虑的远场地震动相比，近断层脉冲型地震动的主要特征为Vmax/Amax和Dmax/Amax（Vmax、Dmax、Amax分别为速度峰值、位移峰值、加速度峰值）指标更大，且近断层脉冲型地震动的主要能量集中在1 Hz以下的频段；在相同峰值加速度幅值、相同反应谱的前提下，近断层地震动对高边墙、大跨度地下工程的破坏程度远比远场地震动大；较之前人的研究方法，文中提出的近断层脉冲型地震动合成方法考虑了[1/Tp

1] Hz这一频段内的地震波信息，更具合理性；在设定的计算条件下，地下厂房洞室群有在近断层地震动作用下发生失稳的危险性，需要进一步针对近断层地震动进行专项风险性评价，以讨论是否需要增设针对性的抗震支护措施。

Abstract

The near-fault ground motion has long been ignored in the seismic design phase of the underground caverns. Hence this issue needs to be seriously addressed. The differences between near-fault and far-field ground motions are firstly discussed

along with the impact of the respective ground motion on underground caverns. Then a modified simulation method of near-fault pulse-type ground motion is proposed. And with the simulated ground motion

the seismic stability of underground caverns for a hydropower station is studied. The results indicate that compared with the conventional far-field ground motion

the near-fault ground motion is characterized by greater Vmax /Amax and Dmax /Amax values (where Vmax

Dmax

Amax are peak values of velocity

displacement and acceleration). And energy of near-fault ground motion is concentrated in 0~1 Hz band. The damage caused by near-fault is far more serious than that of by far-field ground motion

even with same amplitude and spectrum. The proposed simulation method is well logical for considering the information carried in the [1/Tp

1] Hz. With current calculation conditions

the underground powerhouse is in a potential danger of failure under the near-fault ground motion. Thus further specific risk assessment for near-fault ground motions is expected to check if specialized seismic reinforcement measure is required.

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