摘要
在桩-承台-筏板基础中,由于桩实测承载力低于设计值,采用加大筏板厚度方法以调整地基反力分布。在施工全过程中监测关键部位基底反力和柱轴力。结果显示:基底反力与其在筏板或承台下的位置关系不明显,基底近似均匀承受上部荷载;柱实际受力与弹性分析结果相近,表明上部结构保持原有结构体系,未发生内力转移。在施工初期,上部荷载主要由桩间土体承担;随着土体变形增加,新增上部荷载主要由桩承担,主体完工时桩承担的荷载是桩间土的2.20倍。
In a Pile-cushion Cap-raft reinforced concrete foundation,it was found that the measured load bearing capacity of pile was a little smaller than the designed one.For the purpose of distributing the structure load evenly,the thickness of raft was increased from 550 mm to 750 mm.Foundation base and column stresses were monitored during the course of construction.The monitored results showed that the soil stress was evenly distributed no matter under cushion cap or directly under raft.From the initial stage to the final,the load bearing ratio between pile and soil developed from 0.04 to 2.20.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2007年第S2期69-74,共6页
Journal of Wuhan University of Technology
关键词
地基基础工程
监测
基底反力
钢筋轴力
安全
soil and foundation engineering
monitoring
base soil stress
axial force in reinforcement
safety
