Application of principle of minimum potential energy to spatial deformation analysis for deep foundation pit with anchored pile supporting

XU Xi-chang; GE Xiu-run

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Application of principle of minimum potential energy to spatial deformation analysis for deep foundation pit with anchored pile supporting

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- Application of principle of minimum potential energy to spatial deformation analysis for deep foundation pit with anchored pile supporting
- Vol. 27, Issue 5, (2006)
- 作者机构：
  
  中国科学院武汉岩土力学研究所,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU443
- Online First：05 November 2013，
  
  Published：2006
- 稿件说明：
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XU Xi-chang, GE Xiu-run. Application of principle of minimum potential energy to spatial deformation analysis for deep foundation pit with anchored pile supporting[J]. 2006, 27(5).
DOI：

XU Xi-chang, GE Xiu-run. Application of principle of minimum potential energy to spatial deformation analysis for deep foundation pit with anchored pile supporting[J]. 2006, 27(5). DOI：

摘要

以矩形基坑桩锚支护结构为研究对象，通过分析现场实测数据和数值分析结果，归纳出了冠梁和支护桩的空间变形模式，进而建立了整个支护系统的能量表达式。利用最小势能原理，推导了支护桩桩顶最大位移的解析解，并分析了各主要支护参数对该位移的影响。研究结果表明：桩顶最大位移随着坡顶超载和桩间距的增大而线性增大，但随着锚杆刚度的增大而减小；当基坑深度系数逐渐增大时，桩顶最大位移也逐渐增大，但趋势渐缓；基坑长度对桩顶最大位移的影响也较大，但当其超过临界长度后，桩顶最大位移逼近最大值；同样，锚杆安设也具有临界高度，当处于该位置时，桩顶最大位移达到最小值。最后，利用上述研究成果对广州太平广场花园基坑进行了验证，并与现场监测结果作了对比，计算结果能够满足工程要求。

Abstract

According to a lot of field tests and numerical efforts

the spatial deformation pattern of the top beam and pile is deduced for the anchored pile supporting system; and the expression of the potential energy is derived for the total supporting system. Based on the principle of minimum potential energy

a new analytic solution to determining the maximum displacement of the pile head is derived; and the effects of the retaining structural parameters on the displacement mentioned above are discussed. Results show that the maximum displacement of the pile head increases with the increase of the surcharge

the depth coefficient of the excavation and the spacing of the pile; but decreases with the increase of the soil anchor’s stiffness. When the excavation length increases to a critical length

the maximum displacement will approach the maximum value. In addition

the point of application of the soil anchor has a critical position. Finally

the result obtained from the proposed approach is compared with field tests and elastic resistance method.

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Institute of Rock and Soil Mechanics, The Chinese Academy of Sciences

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