基于试桩曲线的桩筏基础沉降实用计算方法  

Practical Calculation Method of Piled Raft Foundation Settlement Based on Static Load Test Curves

作　　者：李洁 罗如平 朱碧堂 Li Jie;Luo Ruping;Zhu Bitang(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Jiangxi Provincial Engineering Research Center for Underground Space Technology Development,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]华东交通大学江西省地下空间技术开发工程研究中心,江西南昌330013

出　　处：《华东交通大学学报》2022年第5期20-28,共9页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(41972291,52020105003);江西省教育厅科学技术基金项目(GJJ200637)。

摘　　要：根据实际工程中桩筏基础沉降处于线弹性阶段的特点,从试桩曲线得到的单桩竖向刚度入手,基于相关理论和经验公式建立了桩筏基础整体竖向刚度的计算方法,并在此基础上给出了在设计荷载作用下桩筏基础平均沉降的实用计算方法。通过对软土地区及黄土地区高层建筑基础、嵌岩桩基础及大型交通工程4大类8个工程实例的现场实测结果对比分析,计算沉降值基本为实测沉降的0.8~1.5倍,验证了所提出的沉降计算方法的可靠性,可为实际桩筏基础初步设计中的沉降计算提供参考。In view of the characteristics that the settlement of pile raft foundation is in the linear elastic stage under design load, based on the vertical stiffness of single pile obtained from the static load test curve, relevant theories and empirical formulas, the calculation method of the overall vertical stiffness of pile raft foundation is established. On this basis, the practical calculation method of the average settlement of pile raft foundation under working load is proposed. Through the comprehensive analysis of the field measurement and calculation results of8 engineering cases in 4 categories of high-rise building foundation in soft soil area and loess area, rock-socketed pile foundation and large traffic engineering, the validity of the proposed method is examined. The calculated settlement value is basically 0.8~1.5 times of the measured settlement, which verifies the reliability of the proposed settlement calculation method in practical engineering. In addition, the calculation method can provide reference for the preliminary design of settlement calculation of actual pile raft foundations.

关 键 词：桩筏基础 沉降计算 试桩曲线 竖向刚度 沉降比 

分 类 号：TU473.1[建筑科学—结构工程] U24[建筑科学—土工工程]