考虑桩土效应的双排桩模型及参数研究

›› 2011, Vol. 32 ›› Issue (2): 481-486.

考虑桩土效应的双排桩模型及参数研究

刘泉声^{1, 2}，付建军²

1.武汉大学水工岩石力学教育部重点实验室，武汉 430072；2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071

收稿日期:2009-12-07 出版日期:2011-02-10 发布日期:2011-02-16
作者简介:刘泉声，男，1962年生，博士，研究员，博士生导师，主要从事岩石温度效应、裂隙岩体温度-水力-应力耦合分析、地下工程稳定性分析及岩土工程加固技术等方面的教学与研究工作。

Research on model and parameters of double-row piles based on effect of pile-soil contact

LIU Quan-sheng ^{1, 2}, FU Jian-jun²

1. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan 430072, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2009-12-07 Online:2011-02-10 Published:2011-02-16

摘要/Abstract

摘要：

双排桩作为一种新型的深基坑支护结构，目前尚无简单而有效的设计方法。首先，借助Winkler地基梁基本思想，在忽略桩土竖向摩擦效应及空间效应的前提下，对双排桩支护结构力学机制进行分析，建立了考虑桩土效应的双排桩平面杆系有限元模型。接着围绕双排桩平面杆系有限元模型的关键参数土压力分布及弹性抗力系数展开了研究，针对连梁拉力将使传统的坑后土体滑移面临界距离增加特征，利用滑动比例系数法获得了土压力分配规律；针对弹性抗力系数正分析取值不确定性，提出了采用位移反分析优化方法获得弹性抗力参数的取值。最后，根据杆系有限元及反分析中位移最优准则函数的求解步骤，分别编制了doublerowpile及doublerowpileparameter计算程序，并进行了相应的工程计算，工程计算结果表明，计算位移与监测位移趋势一致，计算内力符合规范要求，且能较准确获得弹性抗力系数取值。

关键词: 双排桩, 机制, 弹性抗力系数, 位移反分析

Abstract:

Double-row of piles is a new support structure of the deep foundation pit. But its design method is not simple and effective. By means of basic thought of the beam of Winkler foundation, and on the premise of neglecting the friction effect in vertical and space effect between pile and soil, this paper analyzes the mechanical mechanism of support structure of double-row of piles and builds plane bar finite element model based on the effect of pile-soil effect for double-row of piles firstly, and then study the distribution of soil pressure and elastic resistance coefficient around the key parameters of plane bar finite element model of double-row of piles. Considering the critical distance of traditional slip plane of soil behind pit increased by the tension of coupling beam, the distribution law of soil pressure by slip proportional coefficient is obtained. In view of the uncertainty of positive analytical value for elastic resistance coefficient, the value of elastic resistance parameter is proposed by using the optimization method of displacement back analysis. Finally, on the basis of solving steps of optimal criterion function for displacement in bar finite element and back analysis, the doublerowpile and doublerowpileparameter calculation program are compiled respectively; and corresponding engineering calculations are performed. The results show that the calculated displacements are consistent with monitoring displacements, internal forces accord with code requirements and elastic resistance coefficient is accurate comparatively.

Key words: double-row piles, mechanism, elastic resistance coefficient, displacement back-analysis

中图分类号:

TU 473

刘泉声，付建军. 考虑桩土效应的双排桩模型及参数研究[J]. , 2011, 32(2): 481-486.

LIU Quan-sheng, FU Jian-jun. Research on model and parameters of double-row piles based on effect of pile-soil contact[J]. , 2011, 32(2): 481-486.

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