非均布竖向荷载作用下桩筏基础的差异沉降分析  

Differential Settlement Analysis of Piled Raft Roundation under Non-uniformly Distributed Vertical Loads

作　　者：刘立飞 徐志闵 LIU Lifei;XU Zhimin(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Shanghai Municipal Engineering Design and Research Institute,Shanghai 200092,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]上海市政工程设计研究院,上海200092

出　　处：《粉煤灰综合利用》2022年第2期64-73,共10页Fly Ash Comprehensive Utilization

基　　金：中央高校基本科研业务费专项资金项目(B200204032)。

摘　　要：桩筏基础的差异沉降控制是工程设计中的重点问题之一。当上部荷载是非均布荷载时,差异性沉降问题更为突出。本文在前人的研究基础上提出了新的桩–桩、桩–筏相互作用系数的计算公式,使之可以适用于非均布竖向荷载和非均匀布桩的情形。并以此为基础,二次开发并利用SAP 2000有限元软件探究了荷载分布和桩的布置形式对基础差异沉降的影响。结果表明:基础的差异沉降会随着荷载分布的不均匀程度增大而增大;桩的布置形式对于减小差异沉降的效果最为明显,其次是增加桩长和增加桩径,增加筏板厚度对于减小差异沉降则效果甚微。Differential settlement control of pile raft foundations is one of the key issues in engineering design.The problem of differential settlement is more prominent when the upper loads are non-uniformly loaded.In this paper, based on previous research, a new formula for the pile-pile and pile-raft interaction coefficients is proposed so that it can be applied to the case of non-uniform vertical loads and non-uniformly laid piles.Based on this, the SAP2000 finite element software was developed and used to investigate the effects of load distribution and pile arrangement on differential settlement of foundations.The results show that the differential settlement of the foundation increases with the unevenness of the load distribution;the pile arrangement is the most effective in reducing the differential settlement, followed by increasing the pile length and increasing the pile diameter, while increasing the thickness of the raft slab has little effect in reducing the differential settlement.

关 键 词：桩筏基础 差异沉降 非均布荷载 桩-筏-土相互作用 

分 类 号：TU473[建筑科学—结构工程]