围护墙与抗拔桩联合抗浮作用下的抗拔桩设计研究  

Research on the Design of Uplift Pile Under the Combined Anti-Floating Action of Retaining Wall and Uplift Pile

作　　者：万尊坤 WAN Zunkun(Suzhou Zhongtong Planning and Design Co.Ltd.,Suzhou Jiangsu 215133,China;China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]苏州众通规划设计有限公司,江苏苏州215133 [2]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2024年第1期96-99,124,共5页Railway Construction Technology

基　　金：苏州市科技计划项目(SS202048);中铁第五勘察设计院集团有限公司科研计划课题(T5Y2020-C14)。

摘　　要：抗拔桩可以用于抗浮,也可以改善结构内力,但对于围护墙与抗拔桩联合抗浮的工程,抗拔桩实际提供的抗浮力难以直接确定,设计时可能出现桩承载力不足或利用率偏低的情况。为确保抗拔桩承载力满足要求且具有较好的经济性,结合工程实例,建立地铁车站与抗拔桩、围护墙共同作用的三维计算分析模型,对不同桩长、桩径作用下地铁结构、抗拔桩的受力及变形进行对比分析。研究表明:抗拔桩轴向刚度值与抗拔桩桩长、桩径正相关,且桩轴向刚度值越大,需承担的抗浮力就越大,对车站结构内力及变形改善也越明显;当抗拔桩桩长较短或桩径较小时,抗拔桩可能会出现承载力不足的情况,反之,抗拔桩可能会出现承载力利用率偏低的情况,需调整抗拔桩布设方式、桩径、桩长等使承载力满足要求。Uplift piles can be used for anti floating and can also improve structural internal forces.However,for the combined anti-floating engineering of retaining walls and uplift piles,the actual anti buoyancy provided by uplift piles is difficult to directly determine,and there may be insufficient pile bearing capacity or low utilization rate during design.To ensure that the bearing capacity of uplift piles meets the requirements and has good economic efficiency,a three-dimensional calculation and analysis model for the joint action of subway stations,uplift piles,and retaining walls is established based on engineering examples.A comparative analysis is conducted on the stress and deformation of subway structures and uplift piles under different pile lengths and diameters.Research has shown that the axial stiffness value of uplift piles is positively correlated with the length and diameter of uplift piles,and the larger the axial stiffness value of piles,the greater the anti buoyancy force they need to bear,and the more significant the improvement of internal force and deformation of the station structure;when the length of the uplift pile is short or the pile diameter is small,the bearing capacity of the uplift pile may be insufficient.Conversely,the utilization rate of the bearing capacity of the uplift pile may be low.It is necessary to adjust the layout method,pile diameter,pile length,etc.of the uplift pile to meet the requirements of the bearing capacity.

关 键 词：地铁结构 抗拔桩 联合抗浮 桩长 桩径 数值模拟 

分 类 号：TU473.12[建筑科学—结构工程]