Study on the invasion limit excision and support piles reinforcement in deep foundation pit
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摘要: 咬合桩在深基坑工程中已得到广泛应用,受到地质条件、施工组织、操作能力等因素的影响,支护桩侵限事故经常发生。本文通过纤维模型有限元计算程序,计算了侵限处理前、后支护桩的受弯承载力,同时结合桩身深层水平位移监测反分析结果,论证了采用粘钢加固方法处理侵限支护桩的可行性。利用基坑的空间效应,采用分序跳桩施工对侵限支护桩进行切割和加固,基坑处于安全稳定状态;对加固处理后的监测成果及桩身受力情况进行分析,结果显示截面承受的弯矩值小于截面受弯承载力。本项目加固施工取得了良好的效果,有效解决了基坑支护桩侵限的处理难题,可为同类项目提供借鉴。Abstract: The interlocking pile has been widely used in deep foundation pit engineering, and accidents of support piles invasion often occur due to factors such as geological conditions, construction organization, and operational ability. This article uses a fiber model finite element calculation program to calculate the bending bearing capacity of support piles before and after the invasion treatment. At the same time, combined with the back analysis results of the deep horizontal displacement monitoring of the pile, it is demonstrated that the use of adhesive steel reinforcement method to treat the invasion support piles is feasible. Using the spatial effect of the foundation pit, the step-by-step pile jumping construction is used to cut and reinforce the invasion support piles, and the foundation pit is in a safe and stable state. Analysis of the monitoring results after reinforcement treatment and bending condition of pile body shows that the bending moment value borne by the section is less than the bending bearing capacity of the section.The reinforcement construction of this project has achieved good results, effectively solving the invasion limit problem of the support piles in foundation pits, which can provide reference for similar projects.
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[1] 孙玉辉,孙增伟,白朝旭,等.基坑围护桩侵限成因分析与处理[J].工程勘察,2014(3):20-23.
SUN Yuhui, SUN Zengwei, BAI Chaoxu, et al. Analysis on causes of the invasion limit of retaining pile in foundation pit[J]. Geotechnical Investigation & Surveying, 2014(3):20-23.
[2] [2] 谢军,徐长胜.地铁车站围护结构侵界处理方案比选[J].广东土木与建筑,2021,28(11):33-36.
XIE Jun, XU Changsheng. Comparison and selection of treatment schemes for boundary invasion of subway station[J]. Guangdong Architecture Civil Engineering, 2021,28(11):33-36.
[3] [3] 孙一鸣.城际铁路联络线工程围护结构侵限的问题处理分析[J].建筑结构,2021,51(S2):1748-1754.
SUN Yiming. Analysis on the problem of the limit of invasion of the envelope structure of intercity railway line project[J]. Building Structure, 2021,51(S2):1748-1754.
[4] [4] 丁晓军,姜灵程.基坑围护桩侵限处理计算与应用[J].港工技术与管理,2018(2):1-4.
DING Xiaojun, JAING Chengling. Calculation and application of foundation pit retaining pile invasion limit treatment[J]. Ort Harboui Technology Engineering, 2018(2):1-4.
[5] [5] 孙剑,范民浩,李鑫.护坡桩+微型钢管桩复合土钉墙联合支护体系研究应用[J].钻探工程,2021,48(10):116-124.
SUN Jian, FAN Minhao, LI Xin. Combined supporting system of the slope protection pile and the compound soil nail wall with micro steel pipe piles[J]. Drilling Engineering, 2021,48(10):116-124.
[6] [6] 胡朝彬,宋冠樟,片磊,等.灌注桩后注浆技术应用研究及承载力影响分析[J].探矿工程(岩土钻掘工程),2020,47(7):100-105.
HU Chaobin, SONG Guanzhang, PIAN Lei, et al. Post grouting technology and its influence on the bearing capacity of bored piles[J]. Exploration Engineering (Rock & Soil Drilling and Tunnling), 2020,47(7):100-105.
[7] [7] 邵晨晨.复杂地质条件和敏感环境中基坑设计实践及关键技术[J].钻探工程,2021,48(6):102-108.
SHAO Chenchen. Design practice and key technology for the foundation pit in complex geology and sensitive environments[J]. Drilling Engineering, 2021,48(6):102-108.
[8] [8] 张勇,何腊平,龙照,等.钢筋混凝土环形围檩在黄土地区小尺寸深基坑中的应用[J].钻探工程,2023,50(2):100-108.
ZHANG Yong, HE Laping, LONG Zhao, et al. Application of circular reinforced concrete purlins in the small-size deep foundation pit in the loess area[J]. Drilling Engineering, 2023,50(2):100-108.
[9] [9] 杜高恒,何世鸣,刘武军.预应力锚杆肋板墙支护技术在北京某深基坑工程中的应用[J].探矿工程(岩土钻掘工程),2016,43(12):78-81.
DU Gaoheng, HE Shiming, LIU Wujun. Application of support technology of pre-stressed anchor and ribbed plate wall in deep excavation engineering in Beijing[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2016,43(12):78-81.
[10] [10] 徐永波.粘钢加固技术的应用和研究现状[J].安徽建筑,2015(4):52-54.
XU Yongbo. Application of bonding steel strengthen technique and research status[J]. Anhui Architecture, 2015(4):52-54.
[11] [11]
[S].GB 50010—2010 ,混凝土结构设计规范(2015年版) [S].GB 50010—2010 , Code for design of concrete structures (2015 edition)[12] [12]
[S].JGJ 120—2012 ,建筑基坑支护技术规程 [S].JGJ 120—2012 , Technical specification for retaining and protection of building foundation excavations[13] [13] 王佳贺,刘杰.基于测斜监测曲线的基坑围护桩弯矩反分析与应用[J].兰州工业学院学报,2013,20(1):36-42.
WANG Jiahe, LIU Jie. Back analysis and application of bending moment of fender pikes based on lateral deformation[J]. Journal of Lanzhou Institute of Technology, 2013,20(1):36-42.
[14] [14] 李文广,张修成,刘国彬,等.基于监测数据的围护墙弯矩反分析研究[J].山东理工大学学报(自然科学版),2006,20(3):31-39.
LI Wenguang, ZHANG Xiucheng, LIU Guobin, et al. Study on back analysis for bending moment of retaining wall based on monitoring data[J]. Journal of Shandong University of Technology: Natural Science Edition, 2006,20(3):31-39.
[15] [15] 王烨晟,陈文华,吴勇.地铁深基坑围护结构变形——内力反分析研究[J].现代隧道技术,2016(5):71-77.
WANG Yesheng, CHEN Wenhua, WU Yong. Back-analysis on the retaining structure deformation/internal force of a subway deep foundation pit[J]. Modern Tunnel Technology, 2016(5):71-77.
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