Three-dimensional numerical simulation and earth pressure analysis on double-row piles with consideration of spatial effects
Three-dimensional numerical simulation and earth pressure analysis on double-row piles with consideration of spatial effects
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DOI：
10.1631/jzus.a1100067
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发表时间：
2011-10
影响因子：
3.2
通讯作者：
Zi-han Wang;Jian Zhou
中科院分区：
文献类型：
--
作者：
Zi-han Wang;Jian Zhou
双排桩作为一种新型的支护结构形式，其工作性状受空间效应的影响较大。本文采用有限元软件PLAXIS 3D FOUNDATION对双排桩支护结构进行了三维数值模拟。分析了基坑周围不同位置桩的工作性状差异。通过改变桩身长宽比、开挖深度、排距、桩径等参数，研究了桩身侧向变形、桩身弯矩和桩周土压力的变化规律。提出了考虑土压力影响的双排桩支护结构设计参数的合理取值及建议。结果表明，基坑长边中部的侧向变形和弯矩最大，为最不利位置。结果表明，坑底以上排间土压力接近主动土压力，坑底以下排间土压力接近静态土压力。建议桩深、桩径、排距、桩间距分别取1/2-2/3、0.6- 1.2m、3d ~ 6d、2d ~ 2.5d，其中d为桩径。
As a new kind of technology in retaining structures, the characteristics of double-row piles are significantly affected by spatial effects. In this paper, double-row piles as a retaining structure are simulated numerically in three-dimension by finite element software PLAXIS 3D FOUNDATION. The behavior differences of piles in different positions around the foundation pit are analyzed. By changing the parameters, including the length-width ratio, the excavation depth, the distance between rows and the diameter of piles, the variations of the lateral deformation, the bending moment and the earth pressure around the piles are determined. The reasonable values of parameters and some suggestions with consideration of earth pressure are proposed for the design of double-row piles as a retaining structure. The results show that the lateral deformation and bending moment are the largest in the middle of long side of the foundation pit, which is identified as the most unfavorable position. It is indicated that the earth pressure between rows above pit bottom is close to active earth pressure, while the earth pressure between rows under pit bottom is close to static earth pressure. It is suggested that 1/2–2/3 of pile length, 0.6–1.2 m, 3d–6d, and 2d–2.5d be chosen as embedded depth of piles, diameter of piles, distance between rows, and distance between piles, respectively, where d is the pile diameter.