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| 交通荷载作用下结构性软土动本构关系的试验研究 | |
| 引用本文： | 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].岩土力学,2009,30(12):3788-3792. |
| 作者姓名： | 雷华阳 姜岩 陆培毅 马占强 司敬成 |
| 作者单位： | 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 |
| 基金项目： | 国家自然科学基金资助项目，天津市科技创新专项资金项目 |
| 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 |
| 收稿时间： | 2008-08-27 |
Experimental study of dynamic constitutive relation of structural soft soils under traffic loading |
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| 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].Rock and Soil Mechanics,2009,30(12):3788-3792. | |
| Authors: | LEI Hua-yang JIANG Yan LU Pei-yi MA Zhan-qiang SI Jing-cheng |
| Institution: | 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 |
| 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. |
| Keywords: | structural soft soil dynamic triaxial test constitutive relation traffic loading dynamic elastic modulus damping ratio |
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