交通荷载作用下结构性软土动本构关系的试验研究

›› 2009, Vol. 30 ›› Issue (12): 3788-3792.

交通荷载作用下结构性软土动本构关系的试验研究

雷华阳¹，姜岩¹，陆培毅¹，马占强²，司敬成³

1.天津大学土木工程系，天津 300072；2.天津市开发区房地产开发公司，天津 300457；3.天津市勘察院，天津 300191

收稿日期:2008-08-27 出版日期:2009-12-10 发布日期:2010-01-18
作者简介:雷华阳，女，1974年生，副教授。主要从事岩土工程的教学与科研工作。
基金资助:
国家自然科学基金资助项目（No. 50508021）、天津市科技创新专项资金项目（No. 07FDZDSF02100-02）。

Experimental study of dynamic constitutive relation of structural soft soils under traffic loading

LEI Hua-yang¹, JIANG Yan¹, LU Pei-yi¹, MA Zhan-qiang², SI Jing-cheng³

1. Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. Tianjin Development Zone Real Estate Development Company, Tianjin 300457, China; 3. Tianjin Institute of Geotechnical Investigation & Surveying, Tianjin 300191, China

Received:2008-08-27 Online:2009-12-10 Published:2010-01-18

摘要/Abstract

摘要：

基于大量动三轴试验，针对滨海新区结构性软土，研究了其动应力-应变、动模量和阻尼比变化规律，并对振动波型、加荷频率以及固结应力比等影响因素进行了深入的研究，得出了如下的结论：振动波型对于结构性软土的动应力-应变类型影响不大，但是最大动弹模量和动剪切模量的相差可达2.5倍左右；结构性软土具有明显的频率效应和门槛振动频率；半正弦波型条件下，当围压小于结构屈服压力时，最大动弹模量随固结比的增加而递减，超过某一应变幅值时，最大动弹模量将随着固结比的增加而减小；偏压状态下，低应变条件下固结比越大，阻尼比越大，当应变值超过0.004以后，随应变值的不断增大，固结比越大，阻尼比反而越小。所得出的结论对工程应用具有一定的指导意义。

关键词: 结构性软土, 动三轴试验, 本构关系, 交通荷载, 动模量, 阻尼比

Abstract:

Based on a lot of dynamic triaxial tests, the variation laws of dynamic stress-strain, dynamic elastic modulus and damping ratio of structural soft soils were studied; meanwhile, the influences of vibration wave, frequency and consolidation ratio were investigated. It is concluded that the influence of vibration wave on the type of dynamic stress-strain is not evident; the value between the maximum dynamic modulus and dynamic shear modulus is 2.5 times or so. The effect of frequency on the structural soft soil is evident; and there is a threshold vibration frequency. The maximum dynamic modulus decreases with the consolidation ratio increasing as the confining pressure is less than structural yield pressure; and when strain exceeds a certain value, the maximum dynamic modulus decreases with the consolidation ratio increasing. At a lower strain and deviatoric pressure, the higher the consolidation ratio is, the larger the damping ratio is; and when strain exceeds 0.004, the consolidation ratio increases, meanwhile the damping ratio decreases as the strain value increases. The conclusions can provide a useful guidance for the engineering application.

Key words: structural soft soil, dynamic triaxial test, constitutive relation, traffic loading, dynamic elastic modulus, damping ratio

中图分类号:

TU 411.8

雷华阳，姜岩，陆培毅，马占强，司敬成. 交通荷载作用下结构性软土动本构关系的试验研究[J]. , 2009, 30(12): 3788-3792.

LEI Hua-yang, JIANG Yan, LU Pei-yi, MA Zhan-qiang, SI Jing-cheng. Experimental study of dynamic constitutive relation of structural soft soils under traffic loading[J]. , 2009, 30(12): 3788-3792.

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