| 邻近堆载作用下排桩负摩擦力特性研究 |
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| 引用本文： | 屠毓敏,王建江.邻近堆载作用下排桩负摩擦力特性研究[J].岩土力学,2007,28(12):2652-2656. |
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| 作者姓名： | 屠毓敏 王建江 |
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| 作者单位： | TU Yu-min, Wang Jian-jiang |
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| 摘 要： | 利用三维非线性弹性有限元方法研究了承受邻近堆载作用的排桩的负摩擦力特性，分析了排桩间距以及堆载与排桩之间距离的变化对桩身负摩擦力特性的影响，揭示了该类桩桩身轴力的变化规律。研究表明：随着堆载的增大，桩身轴力也随之增大，当堆载增至一定值时，桩间土产生土拱效应，桩身轴力略为减小，堆载继续增大时，土拱效应遭到破坏，桩身轴力再次增大；当堆载增大到一定值时，桩顶部产生局部拉应力，且随着堆载与桩之间距离的增大而增大，中桩的拉应力比边桩要大；桩身最大轴力点位于0.65～0.75倍的桩长处，边桩的轴力大于中桩；随着桩距的增大，桩身轴力也随之增大，而土拱效应削弱；当堆载距排桩一定距离时，桩身轴力达到最大。
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| 关 键 词： | 负摩擦排桩 堆载 三维有限元 土拱效应 |
| 文章编号： | 1000-7598-（2007）12-2652-05 |
| 收稿时间： | 2005-12-05 |
| 修稿时间： | 2005年12月5日 |
Study on negative friction characteristic of row piles subjected to surcharge nearby |
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| TU Yu-min,Wang Jian-jiang.Study on negative friction characteristic of row piles subjected to surcharge nearby[J].Rock and Soil Mechanics,2007,28(12):2652-2656. |
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| Authors: | TU Yu-min Wang Jian-jiang |
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| Institution: | Department of Civil Engineering,Zhejiang University, Hangzhou 310027；China |
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| Abstract: | Three-dimensional nonlinear elastic finite element method had been developed to study the negative friction behavior of the row piles subjected to surcharge nearby. The influence of the space between the row piles and the distance between surcharge and row piles on the negative behavior of the row piles was analyzed. The varying law of the axial force of this kind of piles was posted. Study showed that the axial force of piles increased as surcharge increased. While surcharge increased to a certain value, the soil between the piles brought soil-arch effect and then the axial force of piles decreased a little. While surcharge increased continuously, the soil-arch effect suffered destroy, the axial force of piles increased again. While surcharge increased to a certain value, tensile stress produced partly in the top of piles, it increased with the growth of distance between surcharge and piles, middle piles were more tensile stress than side piles. The most axial force of piles lay in 0.65－0.75 time pile length; side piles were more axial force than middle piles. With the increase of piles’ space the axial force of the piles increased; and soil-arch effect dented. The axial force of piles reached maximum, as a certain distance between surcharge and piles. |
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| Keywords: | negative friction row piles surcharge three-dimensional finite element siol-arch effect |
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