复合地层深基坑嵌岩咬合桩受力变形特征分析  

Analysis of the Deformation Characteristics of the Rock Socketed and Occluded Pile in the Deep Foundation Pit of Composite Stratum

作　　者：付雷锋 FU Leifeng(China Railway 15th Bureau Group Co.Ltd.,Luoyang Henan 471013,China)

机构地区：[1]中铁十五集团有限公司,河南洛阳471013

出　　处：《铁道建筑技术》2024年第10期223-226,共4页Railway Construction Technology

基　　金：中铁十五局集团有限公司科技研发计划项目(2023A5)。

摘　　要：运用FLAC3D数值模拟软件,对复合地层中咬合桩嵌岩深度与基坑支护结构受力变形关系进行分析。结果表明,咬合桩最大水平位移并非随嵌入深度增加而无限制地减小,当嵌入深度达到一定值后,继续增加嵌入深度几乎不能减小咬合桩的最大位移;基坑最大支撑轴力、咬合桩桩身最大正负弯矩和坑外土体位移的影响与此规律类似。因此,在满足抗渗流稳定性验算的条件下,复合地层区域内的地铁车站基坑咬合桩嵌岩深度建议取为2 m。研究结果可为后续类似地质条件下的地铁车站及城市高层建筑基坑支护设计提供借鉴。The relationship between rock-socketed depth of occlusive pile and deformation and stress of foundation pit support structure in composite strata is analyzed by using FLAC3D numerical simulation software.The results show that the maximum horizontal displacement of occluded piles in composite strata does not decrease with the increase of embedding depth.When the embedding depth reaches a certain value,increasing the embedding depth can hardly reduce the maximum displacement of occluded piles.This law has similar effects on the maximum support axial force,the maximum positive and negative bending moment of the bite pile body and the displacement of the soil outside the pit.Therefore,the embedding depth of rock-socketed occlusive piles in the foundation pit of metro station in composite stratum area is suggested to be 2 m under the condition of meeting the checking calculation of seepage resistance stability.This study can provide reference for the design of foundation pit support of metro stations and high-rise buildings under similar geological conditions.

关 键 词：地铁车站 复合地层 支护结构 咬合桩 嵌岩深度 数值分析 

分 类 号：TU476.9[建筑科学—结构工程]