| 砂土中桩土侧向相互作用的应变楔模型修正 |
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| 引用本文： | 杨晓峰,张陈蓉,黄茂松,袁聚云.砂土中桩土侧向相互作用的应变楔模型修正[J].岩土力学,2016,37(10):2877-2885. |
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| 作者姓名： | 杨晓峰 张陈蓉 黄茂松 袁聚云 |
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| 作者单位： | 1. 同济大学 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 基金项目： | 国家重点基础研究发展计划项目（973计划）(No. 2013CB036304)；国家自然科学基金项目(No. 51378392)。 |
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| 摘 要： | 提出了砂土中水平受荷单桩的修正应变楔方法。从3个方面对应变楔模型进行了修正，首先假设三维被动土楔后桩身的水平位移呈非线性变化，从而使得楔形体内的水平应变不再是一常量，而是沿深度变化。其次引入了两个双曲线型的模型分别用以模拟楔形体中土体的水平应力增量-应变关系和桩-土界面处桩侧剪应力-位移关系。然后通过算例验证了修正方法的有效性，模拟结果与实测结果吻合较好。最后分析了各个修正因素对计算结果影响，结果显示，非线性位移假设的引入对原应变楔模型计算的水平承载力偏高有明显地改善，新的水平应力增量-应变关系和桩侧剪应力-位移关系的引入使得应变楔方法更加简便有效。
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| 关 键 词： | 修正应变楔方法 水平受荷桩 p-y曲线 砂土 |
| 收稿时间： | 2015-03-11 |
Modification of strain wedge method for lateral soil-pile interaction in sand |
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| YANG Xiao-feng,ZHANG Chen-rong,HUANG Mao-song,YUAN Ju-yun.Modification of strain wedge method for lateral soil-pile interaction in sand[J].Rock and Soil Mechanics,2016,37(10):2877-2885. |
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| Authors: | YANG Xiao-feng ZHANG Chen-rong HUANG Mao-song YUAN Ju-yun |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | A modified strain wedge (SW) method for analyzing the behavior of laterally loaded single piles in sand is proposed. The modified model assumes that the lateral displacements of a pile behind the three-dimensional passive soil wedge are nonlinear, which makes the horizontal soil strain variable with depths instead of a constant value in the original strain wedge model, and also employs two different hyperbolic models, one for describing horizontal stress increment-strain behavior of soil in the wedge, and the other for describing the shear stress-displacement property at the interface between soil and pile shafts. An example is analyzed to demonstrate the effectiveness of the modified method, and a good agreement is obtained. Finally, the effects of modifications on the lateral bearing capacity of pile shafts are discussed. The results show that the problem of overestimating the lateral bearing capacity of piles with strain wedge method can be ameliorated by introducing the assumption of nonlinear lateral displacements of piles. It makes the SW method more convenient and effective in analyzing the behavior of laterally loaded piles by introducing the new relationships of horizontal stress increment-strain and shear stress-displacement. |
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| Keywords: | modified strain wedge method laterally loaded piles p-y curve sand |
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