含裂隙岩质深基坑桩锚支护结构变形特征研究
摘要:由于开挖量大、施工周期长、施工环境复杂等特点,深基坑工程容易发生施工安全事故。以重庆市某含裂隙岩质深基坑工程为背景,采用有限差分软件FLAC3D建立三维数值模型,模拟了在多层预应力锚索桩板挡墙支护下基坑全开挖过程。基于数值结果分析了基坑开挖过程中土体以及支护结构变形特征。数值计算结果及实测数据表明:(1)受裂隙及邻近建筑的影响,基坑支护结构体系变形以及坑外地表沉降分布具有明显的空间效应;(2)基坑角点处冠梁弯矩随开挖深度的变化规律与基坑中部明显不同;(3)基坑北、南侧中部支护桩的桩身变形呈复合式,东、西侧中部呈悬臂式;(4)采用HS土体本构模型获得的结果与工程实测结果更加符合。地表沉降的数值结果与实测数据较为接近,证实了数值模型的可靠性。研究结果可为类似工程提供参考。
Abstract:Due to the characteristics of a large amount of excavation, long construction period and complex construction environment, deep foundation pit engineering is easy to induce construction safety accidents. The full excavation process of the foundation pit supported by multi-layer prestressed anchor cable pile plate retaining wall was simulated utilizing a three-dimensional numerical model established by FLAC3D, based on the deep foundation pit project with cracks in Chongqing. Soil and supporting structure's deformation characteristics in the excavation process were analyzed based on the numerical results. Numerical result and actual measurement indicate that: (1) the deformation of supporting structure system and the settlement distribution outside the pit have obvious spatial effect under the influence of cracks and adjacent foundation pit buildings; (2) the relationship between the bending moment of the crown beam at the corner of the foundation pit and the excavation depth is obviously different from that in the middle of the foundation pit; (3) the deformation of the supporting pile in the middle of north and south side of the foundation pit is compound type, while deformation of the supporting pile in the central part of the east and west side is cantilever type; (4) the results obtained by HS soil constitutive model are in good agreement with the measured results. The numerical results of surface subsidence at the monitoring point are close to the measured data, which confirms the reliability of the numerical model. The research results can provide practical reference for similar projects in the future.
中文标题:
含裂隙岩质深基坑桩锚支护结构变形特征研究
Deformation Characteristics of the Pile-anchor Supporting Structure of Deep Foundation Pit with Cracks
作者:
王棣1,,田大浪2,
Wang Di1,,Tian Dalang2,
作者简介:王 棣,男,1984年生,汉族,重庆垫江人,大学本科,高级工程师,注册监理工程师,主要从事岩土与结构设计工作。E-mail:wangdi658@163.com
通讯地址:
1.中铁十一局集团第五工程有限公司,重庆 400037 2.重庆大学土木工程学院,重庆 400045
1.The5thEngineeringCo.,Ltd.ofChinaRailway11thBureauGroup,Chongqing400037,China 2.SchoolofCivilEngineering,ChongqingUniversity,Chongqing400045,China
中图分类号:TU 473
doi:10.3969/j.issn.1007-2993.2023.02.018
出版物:岩土工程技术
收稿日期:2021-12-10
录用日期:2023-01-09
刊出日期:2023-04-08
关键词:岩质深基坑,裂隙,锚索桩板挡墙,数值模拟
Key words:deep foundation pit,crack,anchor cable pile plate retaining wall,numerical simulation
文档包含图片数量:图片(11)张
文档包含表格数量:表格(6)个
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基金项目:
基金项目:重庆市教委科技研究计划项目(KJQN201902504)
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