桩锚深基坑开挖受力变形特性数值分析  

NUMERICAL ANALYSIS OF STRESS AND DEFORMATION CHARACTERISTICS IN PILE-SUPPORTED DEEP EXCAVATIONS

作　　者：刘宇 LIU Yu(Shanghai Tunnel Engineering Corporation,Shanghai 200232,China)

机构地区：[1]上海隧道工程有限公司,上海200232

出　　处：《低温建筑技术》2024年第9期101-105,共5页Low Temperature Architecture Technology

摘　　要：随着基坑工程向更大更深方向发展,它所处的地层分布及围护结构设计变得愈发复杂。为研究桩锚支护深基坑开挖过程中的受力变形规律,文中以昆明某深基坑工程为研究对象,运用有限元数值模拟方法对基坑开挖过程中的受力变形规律进行分析,研究基坑开挖过程中的围护桩水平位移、桩身弯矩、坑底隆起及地表沉降的变化规律。研究结果表明,围护桩水平位移和桩身弯矩随开挖深度H增加而增大,最大水平位移位于0.85H处,最大弯矩作用在桩身-14.5 m处;坑底隆起随着基坑开挖由“凸”型隆起逐渐变为“M”型隆起,最大隆起量为47.4 mm;地表沉降呈“V”型分布,最大沉降发生在距坑边0.3H处。As excavation in foundation pit engineering advances to greater depths,the complexity of the soil distribution and supporting structure design increases.This study focuses on a deep foundation pit project in Kunming,using finite element numerical simulation to analyze the stress and deformation patterns during the excavation process.It investigates the variations in horizontal displacement of support piles,bending moments in the piles,bottom heave,and surface settlement.The findings indicate that both horizontal displacement and bending moments of the support piles increase with excavation depth(H).The maximum horizontal displacement occurs at 0.85H,and the maximum bending moment is at a depth of-14.5 meters in the pile.Bottom heave evolves from a"convex"shape to an"M"shape,with a maximum heave of 47.4 mm.Surface settlement shows a"V"shape distribution,with the maximum settlement occurring 0.3H from the pit edge.

关 键 词：深基坑 桩锚支护 数值模拟 围护桩 变形规律 

分 类 号：TU473.2[建筑科学—结构工程]