| 基于Winkler模型的有效桩长研究 |
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| 引用本文： | 戴国亮,余奇异,龚维明.基于Winkler模型的有效桩长研究[J].岩土力学,2012,33(Z2):162-166. |
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| 作者姓名： | 戴国亮 余奇异 龚维明 |
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| 作者单位： | 东南大学 土木工程学院，南京 210096 |
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| 基金项目： | 国家自然科学基金资助(No.50908048) |
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| 摘 要： | 有效桩长的定义有基于承载力角度和沉降角度两种方法，由于影响因素的多样性，有效桩长的研究比较复杂。运用桩顶刚度控制法确定有效桩长。基于Winkler地基模型，以荷载传递法为工具，推导出双层土的桩顶刚度计算公式，并对有效桩长影响因素进行了分析。结果表明，桩径的增大有效桩长增加；土层刚度比(第二层土刚度与第一层土刚度之比)增大有效桩长减小；桩端刚度的增大对有效桩长的影响都不明显，第一土层厚度的增加在一定范围内对提高有效桩长是有用的
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| 关 键 词： | Winkler模型 有效桩长 双层土 桩顶刚度 |
| 收稿时间： | 2011-12-14 |
Study of effective pile length based on Winkler models |
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| DAI Guo-liang,YU Qi-yi,GONG Wei-ming.Study of effective pile length based on Winkler models[J].Rock and Soil Mechanics,2012,33(Z2):162-166. |
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| Authors: | DAI Guo-liang YU Qi-yi GONG Wei-ming |
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| Institution: | School of Civil Engineering, Southeast University, Nanjing 210096, China |
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| Abstract: | The definition of effective pile length can be concentrated on bearing capacity or on pile head settlement. The study of effective pile length is still in progress because of the various affecting factors. The method of controlling the pile head stiffness is used to determine the effective pile length. Based on the Winkler model and load transfer method, the formula of pile head stiffness in two-layer soil is deduced; and then some affecting factors of effective pile length are analyzed The effective pile length increases with the increase of pile diameter; and decreases with the increase of the soil stiffness ratio (defined as the stiffness of the second soil layer to that of the first soil layer). The increase of pile base stiffness doesn’t play an obvious role in effective pile length. The effective pile length will be increased when the thickness of the first layer increase within a certain range. |
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| Keywords: | Winker model effective pile length two-layer soil stiffness of pile head |
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