基于破坏接近度的深基坑稳定性研究  

Stability analysis of deep foundation pit based on failure approach index

作　　者：姚家李 姚华彦[1] 成潇博 张占荣[2] 张燕[2] YAO Jiali;YAO Huayan;CHENG Xiaobo;ZHANG Zhanrong;ZHANG Yan(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;China Railway Siyuan Survey and Design Group Company Limited,Wuhan 430063,China;The Sixth Design Institute,Shanghai Municipal Engineering Design Institute Group Company Limited,Hefei 230031,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]中铁第四勘察设计院集团有限公司,湖北武汉430063 [3]上海市政工程设计研究总院(集团)第六设计院有限公司,安徽合肥230031

出　　处：《辽宁工程技术大学学报(自然科学版)》2024年第6期8-15,共8页Journal of Liaoning Technical University (Natural Science)

基　　金：长三角科技创新共同体联合攻关课题(2022CSJGG1205)。

摘　　要：为探究深基坑在开挖过程中的变形与破坏规律,并实现对基坑安全性的定量评估,采用FLAC3D数值模拟软件,结合破坏接近度理论,对基坑开挖过程中土体应力状态进行系统分析,精确量化基坑周边土体的损伤程度及其影响范围。研究结果表明:基坑围护结构的变形呈现出明显的“两端较小、中部较大”的特点;而地表沉降则表现为典型的“凹槽”形态;利用破坏接近度指标可以直观地反映岩土体在施工期间的破坏进程及发展趋势,区分不同区域受到的影响程度。研究结论为量化分析基坑施工风险提供理论参考。To investigate the deformation and failure patterns of deep foundation pit during the excavation process and quantitatively assess the safety of the excavation,the stress state of the excavation soil was analyzed using FLAC3D software and the failure approach index(FAI)theory.This analysis quantified the extent and range of damage to the surrounding soil of the excavation.The results indicate that the deformation of the retaining piles around the excavation exhibits a“small at both ends,large in the middle”characteristic,while the ground surface settlement deformation presents a“trough”shape.The failure approach index can intuitively reflect the degree of damage and evolutionary patterns of the rock and soil masses during excavation,quantifying the impact scope of excavation construction.The research conclusions provide a theoretical reference for quantifying the risk of foundation pit construction.

关 键 词：深基坑 稳定性 破坏接近度 变形 

分 类 号：TU476.3[建筑科学—结构工程]