加载频率对反滤料动变形特性影响的试验及细观数值模拟研究

›› 2011, Vol. 32 ›› Issue (S1): 419-0423.

加载频率对反滤料动变形特性影响的试验及细观数值模拟研究

杨贵^{1, 2}，刘汉龙^{1, 2}，高德清^{1, 2}

1. 河海大学岩土力学与堤坝工程教育部重点试验室，南京 210098；2. 河海大学安全与防灾工程研究所，南京 210098

收稿日期:2010-07-28 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:杨贵，男，1977年生，博士后，主要从事土石坝抗震及抗震措施方面的研究
基金资助:
国家自然科学基金（No. 50639050）；国家博士后基金（No. 20090461063）；河海大学自然科学基金（No. 2009423911）

Study of test and mesomechanical simulation of influence of vibration frequency on dynamic deformation property of inverted filler

YANG Gui^{1, 2}, LIU Han-long^{1, 2}, GAO De-qing^{1, 2}

1. Key Laboratory for Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China； 2. Engineering Safety and Disaster Prevention Institute , Hohai University, Nanjing 21098, China

Received:2010-07-28 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要： 在动三轴试验过程中，加载频率对动模量和阻尼比的影响目前还没有定论。基于室内动三轴试验结果，采用二维颗粒流程序PFC2D模拟了筑坝反滤料在不同加载频率（f = 1.0、0.5、0.1、0.05 Hz）条件下的室内动三轴试验。数值模拟结果与试验结果基本吻合，试验结果表明，（1）当 f ≥ 0.1 Hz时，频率对动模量和阻尼比的影响可以忽略；当 f < 0.1 Hz时，模量在小应变情况下会有所降低，但随着应变的增大会趋于一致。（2）阻尼比在f = 0.05 Hz时波动比较大，但与其他频率条件下的阻尼比相比都在一个较小的区域内，可以认为频率对阻尼比基本没有影响

关键词: 反滤料, 振动频率, 动模量和阻尼比, 细观力学模拟

Abstract: The influence of loading frequency on dynamic modulus and damping ratio has been inconclusive in dynamic triaxial test. Therefore PFC2D is adopted to simulate dynamic triaxial test of the inverted filler of earth-rockfill dam in different vibration frequencies. The simulated results have tallied in general with those of the test, which shows the influence of frequency on dynamic modulus and damping ratio can be ignored when the frequency is not higher than 0.1 Hz; and that the modulus will decrease in small strain but it will begin to converge as the strain become larger when the frequency is lower than 0.1 Hz. Though the damping ratio has a little fluctuated at 0.05 Hz, it is still in a narrow range when compared with that in other frequencies; so it can be believed that the influence can be ignored.

Key words: inverted filler, vibration frequency, dynamic modulus and damping ratio, mesomechanical simulation

中图分类号:

TU 443

杨贵，刘汉龙，高德清. 加载频率对反滤料动变形特性影响的试验及细观数值模拟研究[J]. , 2011, 32(S1): 419-0423.

YANG Gui , LIU Han-long , GAO De-qing. Study of test and mesomechanical simulation of influence of vibration frequency on dynamic deformation property of inverted filler[J]. , 2011, 32(S1): 419-0423.

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