China Railway 14th Bureau Group Shield Engineering Co., Ltd., Nanjing Jiangsu 211800, China
Clc Number:
TU46+3
Fund Project:
Article
|
Figures
|
Metrics
|
Reference [18]
|
Related [20]
|
Cited by
|
Materials
|
Comments
Abstract:
The open-cut section of a river-crossing tunnel in Nangjing is a super deep foundation pit with think and high water permeability sand layer, where the aquifer is massively thick with large permeability coefficient, and recharged by the Yangtze River. The hanging type water cut-off curtain was used for the foundation pit due to very large water inflow. During the construction of the dewatering well, it was found that the original dewatering scheme cannot meet the requirements for dewatering through well developemt with high deviation. In order to ensure the safety and smooth construction of the foundation pit, in-situ pumping test was carried out while drilling the dewatering well. Through analysis of the test data, and parameter inversion and dewatering simulation using the three-dimensional numerical method, adjustment was made in time on the diameter, number and pump configuration of the dewatering wells in the JD1 and JD2 sections with large excavation depth . The inverted parameters of the pumping test for the foundation pit were much larger than those of the original scheme. The actual water inflow of the foundation pit was as high as 91000 m3/d, which was 2.2 times of the estimated value of 42000 m3/d of the original dewatering scheme. With the timely and proper adjustment of the dewatering scheme, the water level in the pit was reduced below the base with little increase in the total number of wells, which ensured the smooth implementation of the foundation pit, fully demonstrating the importance of dynamic adjustment of pumping test and the pumping test scheme in dewatering.
[1] 龚晓南,沈小克.岩土工程地下水控制理论、技术及工程实践[M].北京:中国建筑工业出版社,2020.GONG Xiaonan, SHEN Xiaoke. Groundwater Control Theory, Technology and Engineering Practice in Geotechnical Engineering[M]. Beijing: China Architecture & Building Press, 2020.
[2] 唐业清,李启民,崔江余.基坑工程事故分析与处理[M].北京:中国建筑工业出版社, 1999.TANG Yeqing, LI Qimin, CUI Jiangyu. Analysis and Treatment of Foundation Pit Engineering Accident[M]. Beijing: China Architecture & Building Press, 1999.
[3] 吉泳安,孟舰.南京江北新区中心区地下空间一期基坑涌水事故处理与启示[J].探矿工程(岩土钻掘工程),2020,47(7):94-99.JI Yongan, MENG Jian. Treatment and analysis of the foundation pit water inrush incident in Nanjing Jiangbei New District[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2020,47(7):94-99.
[4] 虞利军,陶灵聪,苏华.钻孔引发基坑管涌事故的分析与处理对策[J].探矿工程(岩土钻掘工程),2016,43(9):72-74.YU Lijun, TAO Lingcong, SU Hua. Analysis on foundation pit piping accident caused of drilling and the treatment countermeasure[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2016,43(9):72-74.
[5] 庄全贵.地铁车站富水砂层基坑涌水事故分析与处置[J].城市轨道交通研究,2020,23(8):105-107.ZHUANG Quangui. Analysis and disposal of water surge accident in metro station foundation pit built in water-rich silt stratum[J]. Urban Mass Transit, 2020,23(8):105-107.
[6] 刘静,吉泳安.管井降水技术在深基坑涌水事故处理中的应用与启示[J].探矿工程(岩土钻掘工程),2020,47(6):79-85.LIU Jing, JI Yongan. Tube well dewatering technology for the treatment of the deep foundation pit water flooding accident[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2020,47(6):79-85.
[7] 吕波,彭远胜,杨钢锋,等.南宁市某地铁车站基坑涌水原因分析及处理措施[J].施工技术,2018,47(3):88-92.LÜ Bo, PENG Yuansheng, YANG Gangfeng. Analysis and treatment of the water gushing of foundation excavation for a subway station in Nanning[J]. Construction Technology, 2018,47(3):88-92.
[8] 李洪财.南京长江江心洲超大直径盾构接收井明挖段超深基坑降水技术研究[J].探矿工程(岩土钻掘工程),2018,45(5):87-92.LI Hongcai. Study on dewatering technology of ultra-deep foundation pit in opening cut section of super-large diameter shield receiving well in river island of Nanjing Yangtze River[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(5):87-92.
[9] 代洪波.南京长江隧道到达井基坑降水设计与施工[J].探矿工程(岩土钻掘工程),2011,38(10):77-79.DAI Hongbo. Design and construction of dewatering in foundation pit of vertical shaft in Nanjing Changjiang Tunnel[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2011,38(10):77-79.
[10] 王钰,刘静.扬州深大基坑降水方案优化设计[J].探矿工程(岩土钻掘工程),2020,47(9):63-69.WANG Yu, LIU Jing. Optimized dewatering design for a deep and large foundation pit in Yangzhou[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2020,47(9):63-69.
[11] 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.
[12] 邵吉成,骆嘉成,卢立海.疏堵结合堵漏技术在基坑渗漏处理中的应用[J].探矿工程(岩土钻掘工程),2020,47(6):92-96.SHAO Jicheng, LUO Jiacheng, LU Lihai. Application of drainage and plugging technology in treatment of leakage in the foundation pit[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2020,47(6):92-96.
[13] 时钟.高富水、强透水卵石地层深基坑降水设计与实践[J].探矿工程(岩土钻掘工程),2017,44(5):78-83.SHI Zhong. Dewatering design and practice of deep foundation pit in high water-rich and strong permeable cobble stratum[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2017,44(5):78-83.
[14] 曹树辉,车灿辉,吉泳安.深层水平封底在巨厚砂卵石层基坑地下水控制中的应用[J].隧道建设(中英文),2019,39(10):1657-1665.CAO Shuhui, CHE Canhui, JI Yongan. Application of deep horizontal bottom sealing to groundwater control of foundation[J]. Tunnel Construction, 2019,39(10):1657-1665.
[15] 车灿辉.巨厚非均质潜水含水层抽水试验及参数计算[J].探矿工程(岩土钻掘工程),2018,45(11):60-64.CHE Canhui. Pumping test and calculation of hydrogeological parameters for massive anisotropic phreatic aquifers[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(11):60-64.
[16]JGJ 120—2012,建筑基坑支护技术规程[S].JGJ 120—2012, Techincal specification for retaining and protection of building foundation excavations[S].
[17]JGJ 111—2016,建筑与市政工程地下水控制技术规范[S].JGJ 111—2016, Technical code for groundwater control in building and municipal engineering[S].
[18]GB 50296—2014,管井技术规范[S].GB 50296—2014, Technical code for tube well[S].