| 嵌岩抗拔桩作用机制研究 |
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| 引用本文： | 何思明,吴永,李新坡.嵌岩抗拔桩作用机制研究[J].岩土力学,2009,30(2):333-337. |
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| 作者姓名： | 何思明 吴永 李新坡 |
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| 作者单位： | 中国科学院山地灾害与地表过程重点实验室,成都,610041;中国科学院成都山地灾害与环境研究所,成都,610041 |
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| 基金项目： | 国家自然科学基金，交通部西部科技项目 |
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| 摘 要： | 嵌岩抗拔桩广泛应用于现代化建设的各个领域，但就其作用机制研究来说还有待进一步完善，关于其荷载传递特性、侧阻力分布规律及其影响因素等还存在许多模糊认识。以剪滞模型为基础，通过理论分析和验算，讨论了抗拔桩侧阻力分布规律、荷载-变位特性。结果表明：当抗拔荷载低于弹性极限抗拔时，桩侧阻力呈指数规律分布，荷载-变位曲线呈线性变化；当抗拔荷载大于弹性极限抗拔荷载时，桩侧阻力分为两段，其中脱黏段上侧阻力均匀分布，黏结段上侧阻力呈指数规律分布，荷载-变位曲线呈非线性规律变化。
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| 关 键 词： | 抗拔桩 剪滞理论 荷载变位特性 |
| 收稿时间： | 2007-05-30 |
Research on mechanism of uplift rock-socketed piles |
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| HE Si-ming,WU Yong,LI Xin-po.Research on mechanism of uplift rock-socketed piles[J].Rock and Soil Mechanics,2009,30(2):333-337. |
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| Authors: | HE Si-ming WU Yong LI Xin-po |
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| Institution: | 1. Key Laboratory of Mountain Hazards and Surface Process, Chinese Academy of Sciences, Chengdu 610041, China; 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China |
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| Abstract: | The uplift rock-socketed piles have been widely used in modern civil engineering constructions. However, some mechanism of it such as the load transmission characteristic, the side resistance distribution and its influencing factors has not been studied clearly. The shear lag model is used to analyze the side resistance distribution law and the load-displacement characters of uplift rock-socketed piles. Based on theoretical analyses and checking calculation, it is shown that when the load is lower than the elastic limit, the distribution follows the exponential law; and the load-displacement curve assumes linear changes. On the contrary, when the load exceeds the elastic limit the side resistance distribution will be divided into two parts as decoupling section and coupling section respectively. The side resistance is even in the decoupling section, while it follows exponential law in coupling section. Meanwhile, the load-displacement presents a nonlinearity. |
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| Keywords: | uplift pile shear lag theory load-displacement characters |
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