土岩复合地层深基坑桩锚支护数值分析  

Numerical Analysis of Pile-Anchor Support in Deep Excavation Pit with Soil-Rock Composite Strata

作　　者：杨非易 蒋凯 YANG Feiyi;JIANG Kai

机构地区：[1]广西华蓝岩土工程有限公司,广西南宁530200

出　　处：《重庆建筑》2024年第6期56-58,共3页Chongqing Architecture

摘　　要：为探究土岩复合地层基坑中不同桩锚支护形式的结构响应规律,该文依托梧州市某民用深基坑工程,采用PLAXIS数值分析软件分别建立吊脚桩与落底桩两种支护形式的二维数值分析模型,分析对比两者的桩体水平位移变化规律与基坑外土体沉降模式。结果表明:基坑开挖过程中,吊脚桩的整体变形模式由“悬臂式”逐渐向“悬臂+平动”转变,而落底桩的整体变形模式是由“悬臂式”逐渐向“凸肚形”转变;吊脚桩与落底桩的坑外土体沉降模式分别呈现倒三角形分布与凹槽形分布,同时吊脚桩的沉降影响范围较小。该研究对日后相似的工程应用具有一定的参考价值。To explore the structural response characteristics of different pile-anchor support forms in excavation pits with soil-rock composite strata,this study focuses on a civil deep excavation project in Wuzhou City.Using PLAXIS numerical analysis software,twodimensional numerical models were established for two support forms:strutted piles and bottom-bearing piles.The study analyzed and compared the horizontal displacement variations of the piles and the settlement patterns of the surrounding soil mass during excavation.Results show that during the excavation process,the overall deformation pattern of the strutted piles gradually transitions from a"cantilevered"mode to a"cantilevered+translational motion"mode.In contrast,the overall deformation pattern of the bottom-bearing piles changes from a"cantilevered"mode to a"bulging"mode.The settlement patterns of the soil mass surrounding the strutted piles and bottom-bearing piles exhibit an inverted triangular distribution and a trough-shaped distribution,respectively.Additionally,the settlement of strutted piles exerts influence within a small range.This research provides valuable insights for similar engineering applications in the future.

关 键 词：数值模拟 水平位移 土体竖向位移 

分 类 号：TU311[建筑科学—结构工程]