Reinforcement scheme based on large deformation of a pile-anchored enclosure structure
HE Sijin1, ZHAO Yixing2*, ZHANG Huipeng1, RAO Kai1, YUAN Congcong2, SHI Yufeng1,2
1. Nanchang Rail Transit Group Co., Ltd., Nanchang 330013, Jiangxi, China; 2. Jiangxi Key Laboratory of Geotechnical Engineering Infrastructure Safety and Control, East China Jiaotong University, Nanchang 330013, Jiangxi, China
Abstract: The stratum of a certain foundation pit in Jingdezhen is mainly pebble and limestone. In order to meet the requirements of construction operation space and construction schedule, the original design plan adopts a pile-anchored enclosure structure. During the excavation of the foundation pit, the enclosure structure was deformed greatly, threatening the safety of the project, and relevant measures need to be taken for protection. The possible causes of the larger deformation of the retaining structure, and the results showed that the larger deformation of the retaining structure was caused by the failure of the prestressed anchor cable. In view of the current situation, a solution of constructing a local main structure with temporary internal bracing was proposed, and the finite element numerical method was used to simulate the support effect of the original retaining pile and the improved plan. The research showed that the improved scheme could effectively control the deformation and bending moment of the retaining pile, and met the requirements of the corresponding monitoring and measuring early warning value, which could provide reference for related projects.
贺斯进,赵一行,张慧鹏,饶凯,袁聪聪,石钰锋. 基于某桩锚式围护结构大变形加固方案[J]. 隧道与地下工程灾害防治, 2020, 2(4): 59-64.
HE Sijin, ZHAO Yixing, ZHANG Huipeng, RAO Kai, YUAN Congcong, SHI Yufeng. Reinforcement scheme based on large deformation of a pile-anchored enclosure structure. Hazard Control in Tunnelling and Underground Engineering, 2020, 2(4): 59-64.
[1] 龚晓南.深基坑工程设计施工手册[M].北京:中国建筑工业出版社,1998. [2] 姜云申.桩锚支护结构在深基坑工程中的应用及研究[D].济南:山东大学,2013. JIANG Yunshen. Application and research of pile-anchor supporting structure in deep foundation pit engineering[D]. Jinan:Shandong University, 2013. [3] 韩健勇,赵文,贾鹏蛟,等.桩锚支护结构深基坑受力变形及稳定性分析[J].地下空间与工程学报,2017,13(增刊2):907-914. HAN Jianyong, ZHAO Wen, JIA Pengjiao, et al. Analysis on stress, deformation and stability of deep excavation supported by anchored pile[J].Chinese Journal of Underground Space and Engineering, 2017, 13(Suppl.2):907-914. [4] 李阳阳.内撑式桩锚支护结构在深基坑工程中的应用研究[D].保定:河北农业大学,2019. LI Yangyang. Research on the application of internal bracing pile-anchor supporting structure in deep foundation pit engineering[D]. Baoding:Hebei Agricultural University, 2019. [5] 龚晓南.基坑工程实例-5[M].北京:中国建筑工业出版社,2014. [6] 王先登,郝勇.深基坑桩锚支护结构变形探讨[J].中国水运(理论版),2006(3):79-80. [7] 郑筱彦,夏俭,陈春舒.基坑桩锚支护参数优化的数值模拟分析[J].铁道建筑技术,2016(10):74-78. ZHENG Xiaoyan, XIA Jian, CHEN Chunshu. Parameter optimization of pile-anchor support in foundation pit by numerical simulation analysis[J]. Railway Construction Technology, 2016(10):74-78. [8] 钟连祥,陈飞,熊如宗,等.深基坑桩锚支护结构变形分析和数值模拟[J].江西理工大学学报,2018,39(1):6-10. ZHONG Lianxiang, CHEN Fei, XIONG Ruzong, et al. Deformation analysis and numerical simulation of pile-anchor retaining structure in deep foundation pit[J]. Journal of Jiangxi University of Science and Technology, 2018, 39(1):6-10. [9] 过洪赟,赵延林,张钊.桩锚支护深基坑变形模拟分析及优化设计[J].低温建筑技术,2019,41(8):107-110. GUO Hongyun, ZHAO Yanlin, ZHANG Zhao. Simulation analysis and optimal design of deep foundation pit deformation with pile-anchor supported[J]. Low Temperature Architecture Technology, 2019, 41(8):107-110. [10] 黄鑫.深基坑桩锚支护体系的优化方案[J].铁道科学与工程学报,2008,5(6):57-61. HUANG Xin. Optimization scheme for supporting system of pile and bolt in deep foundation pit[J]. Journal of Railway Science and Engineering, 2008, 5(6): 57-61. [11] 张程林,彭炎华.深基坑桩锚支护数值模拟及参数分析[J].施工技术,2008,37(增刊2):321-324. ZHANG Chenglin, PENG Yanhua. Numerical simulation and parameter analysis of pile-anchor retaining in deep foundation pits[J]. Construction Technology, 2008, 37(Suppl. 2): 321-324. [12] 万先逵,魏度强,荆永波,等.某地下防空洞对拉锚式排桩围护结构基坑的影响[J].隧道与地下工程灾害防治,2020,2(1):97-104. WAN Xiankui, WEI Duqiang, JING Yongbo, et al. The influence of an underground shelter on the foundation pit of the pull-anchor pile row retaining structure[J]. Hazard Control in Tunnelling and Underground Engineering, 2020, 2(1): 97-104. [13] 吕懿丰.桩锚支护结构在工程中的应用研究[D].长春:长春工程学院,2017. LÜ Yifeng. Application and research of pile-anchor supporting structure in engineering[D]. Changchun: Changchun Institute of Technology, 2017. [14] 蔡立周,赵丽娟,郑鹏飞,等.锚索预加力对基坑变形及结构内力的影响研究[J].路基工程,2020(2):109-113. CAI Lizhou, ZHAO Lijuan, ZHENG Pengfei, et al. Study on the influence of anchor cable preloading on foundation pit deformation and structural internal force[J]. Subgrade Engineering, 2020(2): 109-113.
2020, Vol. 2 
