罗如平1,2,杨敏1,2?覮,杨军3.刚性筏板下群桩基础共同作用实用分析方法[J].湖南大学学报:自然科学版,2018,45(11):54~61
刚性筏板下群桩基础共同作用实用分析方法
Practical Analysis Method on Interaction of Rigid Piled Raft Foundation
  
DOI:
中文关键词:  桩筏基础  竖向荷载  相互作用  沉降  荷载分担  实用方法
英文关键词:piled raft  vertical loading  soil-pile-raft interaction  settlement  load sharing  practical method
基金项目:
作者单位
罗如平1,2,杨敏1,2?覮,杨军3 (1. 同济大学 岩土及地下工程教育部重点实验室上海 200092 2. 同济大学 地下建筑与工程系上海 2000923. 广东华路交通科技有限公司 广东 广州 510420) 
摘要点击次数: 166
全文下载次数: 206
中文摘要:
      为了分析实际工程中大规模桩筏基础荷载分担及沉降特性,基于桩-土-筏相互作用理论提出了在竖向荷载作用下考虑土体弹塑性的刚性筏板下群桩基础共同作用的实用分析方法.桩-土-筏相互作用包括桩-土、桩-桩、筏-土和桩-筏相互作用,土体弹塑性考虑了土体模量的双曲线型变化特性.通过对不同尺寸条件下桩筏基础现场实测案例进行分析,介绍了计算过程中相应土体参数的取值方法,并基于基础沉降及桩-土荷载分担比实测和计算值对比结果,验证了该计算方法用于分析实际工程中大规模桩筏基础的合理性.同时基于某工程桩基优化分析,其计算结果表明:考虑筏板的荷载分担能显著降低桩基用量,桩数降为原设计1/3左右时,基础沉降并不会显著增加.
英文摘要:
      In order to investigate the load distribution and settlement characteristics of large scale piled raft foundation in practical engineering, a nonlinear analysis method for the rigid piled raft foundations under vertical loading is presented based on the pile-soil-raft interactions theory. Four types of interactions, i.e., pile-soil interaction, pile-pile interaction, raft-soil interaction and raft-pile interaction, are considered for the pile-soil-raft interactions herein. The hyperbolic attenuation pattern of soil modulus is considered for the nonlinear elasto-plastic analysis. Based on the comparisons with the field tests of piled raft foundation with different scale,a method to determine the soil parameters is specified, and the validity of the proposed method is verified by comparing the settlement and load participate ratio with the measured results. The optimized analysis of a piled raft case shows that the number of piles can be reduced significantly, provided that the load distribution of the raft is considered, and when the pile number is reduced to 1/3 of the original, the piled raft settlement does not increase remarkably.
查看全文  查看/发表评论  下载PDF阅读器
关闭