| 循环振动导致黄河口潮坪土成分结构变异研究 |
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| 引用本文： | 董好刚,张卫明,贾永刚,王红雷. 循环振动导致黄河口潮坪土成分结构变异研究[J]. 海洋地质与第四纪地质, 2006, 26(3): 133-141 |
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| 作者姓名： | 董好刚 张卫明 贾永刚 王红雷 |
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| 作者单位： | 中国海洋大学,环境科学与工程学院,青岛,266003;胜利油田勘察设计院,东营,257026;山东省第七地质矿产勘查院,临沂,262508 |
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| 基金项目： | 国家自然科学基金项目(40172088,40472137) |
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| 摘 要： | 在黄河三角洲潮坪采集循环振动荷载施加前后长1 m的原状样各一个,在实验室对原状样以10 cm为间隔取样,进行粒度成分分析和微结构观测,研究循环振动荷载导致的海床土成分与结构的变化。发现总体上振动导致土体颗粒长轴呈现竖向排列趋势,深0~40 cm的表层土细粒含量增高,级配变好;深40~70 cm土体细粒含量降低,级配变差;70 cm以下土体受振动影响不明显。现场海床土孔隙水压力监测结果表明,这种海床土的成分结构变异与循环荷载导致土体重复液化及渗流场作用有关。
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| 关 键 词： | 粉质土 循环荷载 粒度成分 微结构 黄河口 |
| 文章编号： | 0256-1492(2006)03-0133-09 |
| 修稿时间： | 2005-11-23 |
TRANSFORMATION OF GRANULAR COMPOSITION AND MICROSTRUCTURE OF SILT DUE TO CYCLIC LOADING IN YELLOW RIVER ESTUARY, CHINA |
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| DONG Hao-gang,Zhang Wei-ming,Jia Yong-gang,Wang Hong-lei. TRANSFORMATION OF GRANULAR COMPOSITION AND MICROSTRUCTURE OF SILT DUE TO CYCLIC LOADING IN YELLOW RIVER ESTUARY, CHINA[J]. Marine Geology & Quaternary Geology, 2006, 26(3): 133-141 |
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| Authors: | DONG Hao-gang Zhang Wei-ming Jia Yong-gang Wang Hong-lei |
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| Abstract: | From the tidal flat of the Yellow River Estuary,each undisturbed sample of 1 m long was collected before and after cyclic vibrating.The microstructure has been observed with SEM and the transformation characteristics of the granularity have been contrasted at an interval of 10 cm.The results revealed that granularity direction strengthened and the long axes are in a perpendicular trend in general;fine grains gathered in certain areas above 40 cm depth,so the asymmetry coefficient rised and the gradation became better.The granularity change of soil from 40 to 70 cm depth was quite on the contrary;changes below 70 cm depth were not so obvious.The reason may be due to repeat liquefaction of seabed and the variations of seepage field that were induced by cyclic vibration. |
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| Keywords: | silt cyclic loading granularity composition microstructure Yellow River Estuary |
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