| 循环荷载作用下软土的孔压模式和强度特征 |
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| 引用本文： | 聂庆科,白 冰,胡建敏,商卫东. 循环荷载作用下软土的孔压模式和强度特征[J]. 岩土力学, 2007, 28(Z1): 724-729 |
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| 作者姓名： | 聂庆科 白 冰 胡建敏 商卫东 |
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| 作者单位： | 1. 河北建设勘察研究院有限公司，石家庄 050031； 2. 北京交通大学 土木建筑工程学院，北京 100044 |
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| 基金项目： | 北京市自然科学基金（No. 8062024） |
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| 摘 要： | 通过循环三轴剪切试验，研究原状软土的变形和孔压发展规律。建议了一个循环荷载作用下孔隙水压力的发展模式。研究了不排水循环荷载作用下软土的动强度以及作用后饱和软土静强度的衰减特征，讨论了周围固结压力和荷载作用频率对动强度的影响。研究表明，在某一轴向应变条件下，循环次数随循环剪应力比的增加而迅速减小；随循环剪切应力比的增大，饱和软土的静强度有一定衰减。
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| 关 键 词： | 循环荷载 变形 孔隙水压力 循环应力比 |
| 收稿时间： | 2007-03-24 |
The pore pressure model and undrained shear strength of soft clay under cyclic loading |
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| NIE Qing-ke,BAI Bing,HU Jian-min,SHANG Wei-dong. The pore pressure model and undrained shear strength of soft clay under cyclic loading[J]. Rock and Soil Mechanics, 2007, 28(Z1): 724-729 |
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| Authors: | NIE Qing-ke BAI Bing HU Jian-min SHANG Wei-dong |
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| Affiliation: | 1. Hebei Research Institute of Construction and Geotechnical Investigation Co. Ltd., Shijiazhuang 050031, China； 2. School of Civil and Architecture Engineering, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | The developments of pore pressure and axial deformation of undisturbed samples are studied by cyclic axial shear tests. A model for predicting the evolution of pore pressure under cyclic shear loading is proposed. The dynamic shear strength under undrained cyclic shear conditions is determined, and the degradation characteristics of undrained monotonic shear strength after cyclic loading are also analyzed. The effects of confining pressure and the frequency of cyclic loading on dynamic shear strength are studied. Studies show that, under a definite axial strain, the cyclic numbers decreases notably with the increase in cyclic stress ratio. Besides, the static undrained shear strength is degraded with the increase in cyclic stress ratio. |
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| Keywords: | cyclic loading；deformation pore pressure cyclic stress ratio |
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