| 动荷载作用下黄土的强度特征及结构变化机理研究 |
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| 引用本文： | 胡瑞林,李焯芬,王思敬,张礼中,李向全.动荷载作用下黄土的强度特征及结构变化机理研究[J].岩土工程学报,2000,22(2):174-181. |
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| 作者姓名： | 胡瑞林 李焯芬 王思敬 张礼中 李向全 |
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| 作者单位： | 中国科学院工程地质力学开放研究实验室!北京；100029；香港大学土木工程系!香港；国土资源部水文地质工程地质研究所!石家庄；050061； |
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| 基金项目： | 中国博士后基金! ( 1 999年度 )，地矿部跨世纪科技人才基金! (编号 :1 2 5)，中科院 -香港大学边坡工程中心和中科院的联合资助!KZ952 |
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| 摘 要： | 本文通过室内模拟强夯试验研究了黄土在动力荷载的作用下其强度变化规律 ,发现强度随夯击次数的增加将出现阶段性变化。初期以单调的递增变化为特征 ,但达到某一界限值后出现了宏、微观变化差异。前者以增幅减缓为主 ,而后者则出现了强度逐渐降低现象。结构分析表明 ,强度的这种变化主要受微结构状态调整制约 ,而土粒尺寸和取向的非均匀化发展以及微观损伤的再扩大是已加固土体强度降低的主要原因。
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| 关 键 词： | 黄土 动力固结 强度 微结构变化 |
| 修稿时间： | 1999-06-07 |
Approach to the strength behaviors and microstructural changes of loess under dynamic load |
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| Hu Ruilin,C.F.Lee,Wang Sijing,Zhang Lizhong,Li Xiangquan.Approach to the strength behaviors and microstructural changes of loess under dynamic load[J].Chinese Journal of Geotechnical Engineering,2000,22(2):174-181. |
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| Authors: | Hu Ruilin CFLee Wang Sijing Zhang Lizhong Li Xiangquan |
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| Affiliation: | Engineering Geological Mechanical Lab Institute of Geology Chinese Academy of Sciences Beijing 100029, Department of Civil Engineering, The University of Hong Kong, Hong Kong, Engineering Geological Mechanical |
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| Abstract: | With the help of the dynamic consolidation instrument, the shear strength characteristics of loess have been studied. The experiment results revealed that the shear strength varies in stages with increasing number of blow counts (N). During the initial stage, a uniform increase in soil strength is obtained. Upon reaching a limit, the shear strength decreases. A microstructural analysis demonstrates that this variation of shear strength is basically controlled by the alteration of microstructure state in terms of the growing heterogeneity of size and orientation of grains as well as increase in structural damage. |
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| Keywords: | loess dynamic consolidation shear strength alteration of microstructure state |
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