|Table of Contents|

Deformation Characteristics of Underwater Excavation of Deep Foundation Pit and Optimization of Sub-warehouse at Foundation Pit Bottom(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年06期
Page:
95-103
Research Field:
Publishing date:

Info

Title:
Deformation Characteristics of Underwater Excavation of Deep Foundation Pit and Optimization of Sub-warehouse at Foundation Pit Bottom
Author(s):
LI Bo1;  WANG Gui-he1;  LYU Gao-feng2;  WANG Yun-chao3
(1. School of Engineering and Technology, China University of Geosciences(Beijing), Beijing 100083, China; 2. Beijing Metro Construction Administration Corporation Ltd., Beijing 100068, China; 3. The Architectural Design and Research Institute of Henan Province Co., Ltd., Zhengzhou 450014, Henan, China)
Keywords:
deep foundation pit;  underwater excavation;  numerical simulation;  wall deformation;  sub-warehouse wall;  layout form
PACS:
TU470
DOI:
-
Abstract:
Based on the deep foundation pit project of Yongding Gate Outside Station of Beijing Metro Line 8, the underwater excavation method of deep foundation pit in water-rich sandy pebble stratum with high water level, large thickness and strong permeability was introduced. By means of numerical simulation, the numerical model of underwater excavation of deep foundation pit was constructed. The model was validated by the measured data. Based on the model, the characteristics of surface settlement outside the pit, horizontal displacement and deformation of the wall in the process of underwater excavation of deep foundation pit were analyzed. The results show that for foundation pit engineering in water-rich sandy cobble stratum, the underwater excavation and sub-warehouse technology at the bottom of pit can effectively control the deformation of foundation pit. The surface settlement outside the pit mainly occurs in the stage of dry excavation and dredging excavation, and the surface settlement caused by underwater excavation only accounts for about 7% of the total deformation. The setting of sub-warehouse wall can effectively limit the uplift of the bottom of pit and the deformation of the middle and lower part of the foundation pit. The wall deformation is bow-shaped under the action of the upper support and the lower part of the sub-warehouse wall. Most of the wall deformation occurs in the stage of dry excavation and dredging excavation. The wall deformation caused by underwater excavation only accounts for about 10% of the total deformation. The number of warehouses and the layout of warehouses affect the deformation of the middle and lower part of the wall. When the number of warehouse increases to a certain number(20 warehouses), the wall deformation can be controlled obviously. The warehouse can be reduced to 12 warehouses when the requirements of anti-floating are satisfied. When the number of warehouses is fixed, the transverse layout is more advantageous to control the wall deformation than the longitudinal layout.

References:

[1] WANG J X,FENG B,YU H P,et al.Numerical Study of Dewatering in a Large Deep Foundation Pit[J].Environmental Earth Sciences,2013,69(3):863-872.
[2]周念清,高逸群,黄钟晖,等.采用改进区间层次分析法评估地铁工程地下水风险[J].建筑科学与工程学报,2017,34(6):21-27.
ZHOU Nian-qing,GAO Yi-qun,HUANG Zhong-hui,et al.Groundwater Risk Assessment by Interval-based Improvement of Analytic Hierarchy Process in Subway Project[J].Journal of Architecture and Civil Engineering,2017,34(6):21-27.
[3]ZHANG C X.Study on the Post-processing System of Groundwater Produced by High-rise Building Foundation Pit Construction[C]//SHAHHOSSEINI A M.Proceedings of the 2015 International Conference on Mechanics and Mechatronics(ICMM2015).London:World Scientific Publishing Co Pte Ltd,2015:1193-1198.
[4]LI H P.Research of the Underground Water Level Prediction Model in Deep Foundation Pit Engineering[J].Applied Mechanics and Materials,2014,675-677:901-904.
[5]王洪光,郑婉莹.水下开挖法在市政工程深基坑施工中的应用探微[J].建材发展导向,2017,15(11):41-42.
WANG Hong-guang,ZHENG Wan-ying.Application of Underwater Excavation Method in Deep Foundation Pit Construction of Municipal Engineering[J].Development Guide to Building Materials,2017,15(11):41-42.
[6]孙智勇.水下开挖法在市政工程深基坑施工中的应用[J].城市轨道交通研究,2016(3):114-118,137.
SUN Zhi-yong.Application of Underwater Excavation Method in Municipal Excavation Engineering[J].Urban Mass Transit,2016(3):114-118,137.
[7]胡云华.临江高承压水超深基坑开挖抗突涌分析与对策——以南京纬三路长江隧道梅子洲风井基坑为例[J].隧道建设,2015,35(11):1194-1201.
HU Yun-hua.Analysis on and Countermeasures for Water Inrush in Construction of Ultra-deep Foundation Pit at Riverside Under High Confined Water:Case Study on Deep Foundation Pit of Meizizhou Ventilation Shaft of Weisanlu River-crossing Tunnel in Nanjing[J].Tunnel Construction,2015,35(11):1194-1201.
[8]李耀良,王理想,余振栋,等.超大面积港池基坑的陆上和水下开挖施工技术[J].建筑施工,2008,30(10):848-850.
LI Yao-liang,WANG Li-xiang,YU Zhen-dong,et al.Excavation Technology Under Water and on Land for Ultra Large Foundation Pit of Harbor Basin[J].Building Construction,2008,30(10):848-850.
[9]李 华.基于大面积水下基坑开挖的特点分析与对策[J].黑龙江水利科技,2012,40(3):207-208.
LI Hua.Characteristics Analysis and Countermeasures Based on Large-scale Underwater Foundation Pit Excavation[J].Heilongjiang Science and Technology of Water Conservancy,2012,40(3):207-208.
[10]李学武.船坞工程水下开挖施工技术[J].广东水利水电,2003(增2):30-31.
LI Xue-wu.Underwater Excavation Construction Technology of Dock Project[J].Guangdong Water Resources and Hydropower,2003(S2):30-31.
[11]张 健.超深竖井水下开挖施工关键技术[J].公路与汽运,2011(2):174-177.
ZHANG Jian.Key Technology of Underwater Excavation of Ultra-deep Shaft[J].Highways & Automotive Applications,2011(2):174-177.
[12]ZHOU N,VERMEER P A,LOU R,et al.Numerical Simulation of Deep Foundation Pit Dewatering and Optimization of Controlling Land Subsidence[J].Engineering Geology,2010,114(3/4):251-260.
[13]瞿成松,徐 丹.地下水回灌在地铁边基坑降水中的应用[J].岩土工程技术,2012,26(5):238-241.
QU Cheng-song,XU Dan.Groundwater Recharge of Pit Dewatering Close to the Metro[J].Geotechnical Engineering Technique,2012,26(5):238-241.
[14]瞿成松,陈 蔚,黄 雨.人工回灌控制基坑工程地面沉降的数值模拟[J].中国海洋大学学报,2011,41(6):87-92,108.
QU Cheng-song,CHEN Wei,HUANG Yu.Numerical Simulation for Subsidence of Deep Foundation Pits Controlled by Artificial Groundwater Recharge[J].Periodical of Ocean University of China,2011,41(6):87-92,108.
[15]武永霞,张 楠,陆建生.地下水回灌技术在浅层承压含水层中的实践与探讨[J].岩土工程技术,2010,24(3):156-160.
WU Yong-xia,ZHANG Nan,LU Jian-sheng.Practice and Research of Groundwater Recharge in Shallow Confined Aquifer[J].Geotechnical Engineering Technique,2010,24(3):156-160.
[16]黄应超,徐杨青.深基坑降水与回灌过程的数值模拟分析[J].岩土工程学报,2014,36(增2):299-303.
HUANG Ying-chao,XU Yang-qing.Numerical Simulation Analysis of Dewatering and Recharge Process of Deep Foundation Pits[J].Chinese Journal of Geotechnical Engineering,2014,36(S2):299-303.
[17]段宝德,石满菊,王 剑.水下开挖施工监控系统[J].现代测绘,2007,30(6):25-27.
DUAN Bao-de,SHI Man-ju,WANG Jian.The Construction Monitoring System of Underwater Digging[J].Modern Surveying and Mapping,2007,30(6):25-27.
[18]魏战宇.基于WSN嵌入式水下监测系统的设计与实现[D].大连:大连理工大学,2009.
WEI Zhan-yu.Design and Implementation of Embedded Underwater Detection System Based on WSN[D].Dalian:Dalian University of Technology,2009.
[19]杨 卓,吴剑波,赵一臻,等.地铁深基坑开挖对紧邻建筑影响的有限元模拟与监测研究[J].建筑科学与工程学报,2016,33(2):121-126.
YANG Zhuo,WU Jian-bo,ZHAO Yi-zhen,et al.Research on Finite Element Simulation and Monitoring of Influence Subway Deep Foundation Pit Excavation on Adjacent Building[J].Journal of Architecture and Civil Engineering,2016,33(2):121-126.
[20]刘俊岩.《建筑基坑工程监测技术规范》GB 50497—2009研究与编制[J].施工技术,2009,38(5):1-4.
LIU Jun-yan.Research and Compilation of Technical Code for Monitoring of Building Excavation Engineering GB 50497—2009[J].Construction Technology,2009,38(5):1-4.
[21]付文光,柳建国,杨志银.抗浮锚杆及锚杆抗浮体系稳定性验算公式研究[J].岩土工程学报,2014,36(11):1971-1982.
FU Wen-guang,LIU Jian-guo,YANG Zhi-yin.Formulae for Calculating Stability of Anti-floating Anchor and Anchor Anti-floating System[J].Chinese Journal of Geotechnical Engineering,2014,36(11):1971-1982.
[22]吴 竞.地下结构抗浮设计中抗拔桩的应用研究[D].南昌:南昌大学,2010.
WU Jing.Underground Structure Anti-uplift Design Uplift Piles of Applied Research[D].Nanchang:Nanchang University,2010.
[23]罗耀武,胡 琦,陈云敏,等.基坑开挖对抗拔桩极限承载力影响的模型试验研究[J].岩土工程学报,2011,33(3):427-432.
LUO Yao-wu,HU Qi,CHEN Yun-min,et al.Model Tests on Ultimate Uplift Capacity of Piles Under Excavation[J].Chinese Journal of Geotechnical Engineering,2011,33(3):427-432.
[24]沈世杰.《给水排水工程构筑物结构设计规范》GB 50069—2002、《给水排水工程管道结构设计规范》GB 50332—2002简介[J].特种结构,2003,20(4):20-27.
SHEN Shi-jie.Brief Introduction of Structural Design Code for Special Structures of Water Supply and Waste Water Engineering GB 50069—2002,Structural Design Code for Pipelines of Water Supply and Waste Engineering GB 50332—2002[J].Special Structures,2003,20(4):20-27.

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Last Update: 2019-11-26