岩土力学2024，Vol.45Issue(3)：846-856,11.DOI:10.16285/j.rsm.2023.0456
束浆挤扩钢管桩竖向抗拔承载力计算方法
Calculation of uplift capacity of steel pipe pile with constrained grouting
摘要
Abstract
With exploiting of the urban underground space,the problem of anti-floating foundation becomes prominent in the soft soil areas.Bored and precast piles are widely used due to their environmental friendliness,but drilling process typically reduces the shaft resistance.Thus a constrained grouting pile is proposed.In order to accurately evaluate the uplift capacity of steel pipe pile with constrained grouting,the failure mechanism is analyzed,and the logarithmic spiral curve is adopted to fit the local slip surface.The simplified calculation formula is derived,and its effectiveness is verified by a classic case study.Based on the design concept of orthogonal experiment,the influencing factors of uplift capacity are compared.The results show that the diameter of pile and the strength of pile-soil interface control the uplift capacity.Field test on the steel pipe pile with constrained grouting is carried out.The test shows that the uplift capacity of the pile is increased by 70％.It is more accurate and safer to use the theoretical formula proposed to calculate the uplift capacity of foundation pile.The research results provide reference for the uplift capacity design of the constrained grouting piles.关键词
束浆挤扩/钢管桩/抗拔承载力/对数螺旋线/简化计算方法Key words
constrained grouting process/steel pipe pile/uplift capacity/logarithmic spiral curve/simplified calculation method分类
建筑与水利引用本文复制引用
王长虹,杨天笑,马铖涛,沈洋..束浆挤扩钢管桩竖向抗拔承载力计算方法[J].岩土力学,2024,45(3):846-856,11.基金项目
上海高校特聘教授岗位计划(No.TP2018042) （No.TP2018042）
上海市浦江人才计划(No.18PJ1403900) （No.18PJ1403900）
上海市社会发展科技攻关项目(No.21DZ1204300).This work was supported by the Program for Professor of Special Appointment at Shanghai Institutions of Higher Learning(TP2018042),the Shanghai Pujiang Program(18PJ1403900)and the Social Development Science and Technology Research Projects of Shanghai(21DZ1204300). （No.21DZ1204300）
