岩土力学 ›› 2019, Vol. 40 ›› Issue (6): 2354-2368.doi: 10.16285/j.rsm.2018.1409

• 岩土工程研究 • 上一篇    下一篇

基于差异沉降和轴向刚度控制的竖向荷载作用下群桩基础优化分析

张治国1, 2，张 瑞1，黄茂松3，宫剑飞4   

  1. 1. 上海理工大学 环境与建筑学院，上海 200093；2. 中国矿业大学 深部岩土力学与地下工程国家重点实验室，江苏 徐州 221116； 3. 同济大学 地下建筑与工程系，上海 200092；4. 中国建筑科学研究院 地基基础研究所，北京 100013
  • 收稿日期:2018-09-11 出版日期:2019-06-11 发布日期:2019-06-22
  • 作者简介:张治国，1978年生，男，博士（后），副教授，硕士生导师，主要从事地下工程施工影响方面的研究与教学工作。
  • 基金资助:
    国家自然科学基金（No.51738010，No.41772331）；中国矿业大学深部岩土力学与地下工程国家重点实验室基金项目（No.SKLGDUEK1707）。

Optimization analysis of pile group foundation based on differential settlement control and axial stiffness under vertical loads

ZHANG Zhi-guo1, 2, ZHANG Rui1, HUANG Mao-song3, GONG Jian-fei4   

  1. 1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 4. Institute of Foundation Engineering, China Academy of Building Research, Beijing 100013, China
  • Received:2018-09-11 Online:2019-06-11 Published:2019-06-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51738010, 41772331) and the Projects of State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology(SKLGDUEK1707).

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摘要： 目前在群桩设计中仍大多数采用均匀等长布桩的方法，这种方法在基础受力、变形等方面存在较大的缺陷。考虑增大群桩轴向刚度和减小群桩基础差异沉降的条件下，将群桩基础位移函数与桩长优化函数相结合，在对基础采取行变换、平面变换的方式下，通过设置不同的桩长比值ξ、连接曲率值η设定不同布桩方案，分析不同方案下群桩基础轴向刚度比、差异沉降比的变化规律；并利用数值模拟法对所得优化结果的可靠性进行验证。此外，针对不同桩土刚度比、不同桩间距对群桩基础的轴向刚度比和差异沉降比进行了参数分析。研究结果表明：不同群桩基础优化变换方式、不同桩长对群桩基础优化结果会产生不同的影响；当优化目的是为增加群桩基础刚度时，应主要考虑行变换的优化方式，当优化目的是为减小基础差异沉降时，应主要考虑平面变换的优化方式；基础轴向刚度比随着桩土刚度比的增加而增大，随着桩间距的减小而增大；基础差异沉降比随着桩土刚度比的增加而减小，随着桩间距的减小而减小。

关键词: 群桩, 桩长优化, 轴向刚度比, 差异沉降比

Abstract: At present, the method of uniform isometric piles is used in most group pile designs. This method has major defects in foundation stress and deformation. Considering the increase of group pile foundation stiffness and reducing the differential settlement of group pile foundation, the group pile foundation displacement function is combined with the pile length optimization function. Under the method of line transformation and squared transformation, different group pile designs are determined by setting different pile length ratio ξ and connection curvature η. The scheme is used to analyze the variation law of axial stiffness ratio and differential settlement ratio of group pile foundation under different schemes. The reliability of theoretical analysis results is verified by finite element method. In addition, parametric analysis of axial stiffness ratio and differential settlement ratio of pile group foundations are based on different pile-soil stiffness ratios and different pile spacings. The results show that the optimal transformation mode of different pile groups and different pile lengths have different effects on the optimization results of group pile foundations. When the optimization purpose is to increase the pile group foundation stiffness, the optimization method of line transformation should be chosen. When the optimization purpose is to decrease the differential settlement of pile group foundation, the optimization method of squared transformation should be chosen. The axial stiffness of pile group increases with the increasing of pile-soil stiffness ratio and the decreasing of pile spacing. The differential settlement ratio of pile group decreases with the increasing of pile-soil stiffness ratio and the decreasing of pile spacing.

Key words: pile group, optimization of pile length, axial stiffness ratio, differential settlement ratio

中图分类号: 

  • TU 473.1
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