考虑开挖卸荷及变形耦合效应的被动桩分析方法

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摘要基坑、隧道的开挖将不可避免地影响邻近受荷桩基的工作性能，如何合理评价开挖条件下邻近受荷桩基的附加响应至关重要。针对 Winkler 地基梁模型的不足，提出了一种改进的非线性两阶段分析方法，该法能够合理地考虑桩土作用的非线性特征、桩顶工作荷载对桩身附加轴力的影响及轴力产生的偏心弯矩对水平挠曲的影响等，并给出了该改进算法的增量法求解过程。同时将本文方法与已有研究成果进行了对比，验证了本文方法的合理性，并进一步探讨了桩顶工作荷载对竖向附加响应及轴向力对水平附加响应的影响规律。结果表明：桩顶工作荷载对竖向附加响应的影响是显著的；而轴向力对水平挠曲的影响程度则与自由场位移模式等相关，对于部分位移模式，影响也很显著。

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	郑俊杰
	章荣军
	潘玉涛
	崔岚

关键词 ：被动桩, 开挖卸荷, 变形耦合效应, 自由场位移, 非线性荷载传递法, 增量法

Abstract：Excavation of foundation pits and tunnels will inevitably influence the working performance of adjacent loading piles, thus, it is important to accurately evaluate the additional pile responses due to soil excavation. In order to overcome the deficiency of the conventional Winkler’s foundation beam model, a modified nonlinear two-stage analysis method is proposed. It can consider the nonlinear characteristics of pile-soil interaction, influence of pre-phase working load on the excavation-induced additional axial force as well as influence of axial force on the lateral deflection more factually. Combined with the incremental method, the solving process of nonlinear equations is then presented. Moreover, the calculated results are compared with those from other existing methods to verify the calculation accuracy of the proposed method, and a further study is made to investigate the influence laws of pre-phase working load on additional axial force and the axial force on lateral deflection. The results indicate that the influence of pre-phase working load on the vertical additional responses is significant; the influence degree of axial force on lateral responses is relevant to (but not limited to) the mode of free-field displacement, and under some situations, the influence of axial force on lateral responses is not negligible and the coupling effects should be rationally considered.

Key words： passive piles excavation-induced unloading effect deformation coupling effect free-field movement nonlinear load-transfer method incremental method

收稿日期: 2012-06-25

U452

基金资助:新世纪优秀人才支持计划资助项目(NCET-06-649)

作者简介: 郑俊杰 (1967 – ),男，教授，博士生导师，主要从事隧道工程与岩土工程方面理论研究及数值计算工作。

引用本文:

郑俊杰, 章荣军, 潘玉涛, 崔岚. 考虑开挖卸荷及变形耦合效应的被动桩分析方法[J]. 岩土工程学报, 2012, 34(4): 606-614. ZHENG Jun-jie, ZHANG Rong-jun, PAN Yu-tao, CUI Lan. Analytic method for passive piles considering excavation-induced unloading effects and deformation coupling effect. Chinese J. Geot. Eng., 2012, 34(4): 606-614.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2012/V34/I4/606

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