|Table of Contents|

Study on influence of excavation width on deformation of supporting structure in L-shaped corner area of shaped foundation pit(PDF)

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

Issue:
2024年04期
Page:
159-170
Research Field:
岩土工程
Publishing date:

Info

Title:
Study on influence of excavation width on deformation of supporting structure in L-shaped corner area of shaped foundation pit
Author(s):
LI Jilin1;  YIN Aiyue1;  WEI Huanwei2;  ZHENG Xiao2;  LI Qingyuan2
(1.Shandong Electric Power Engineering Consulting Institute Corp., Ltd., Jinan 250013, Shandong, China; 2. School of Civil Engineering, Shandong Jianzhu University, Jinan 250101,Shandong, China)
Keywords:
shaped foundation pit;  deformation pattern;  numerical simulation;  corner effect
PACS:
TU473.2
DOI:
10.19815/j.jace.2022.05017
Abstract:
In order to study the influence of different excavation widths on the deformation law of the supporting structure at the L-shaped corner area of the foundation pit, based on the field measurement data of a shaped deep foundation pit project in Binzhou city, the variability of the deformation pattern of the supporting structure at the negative and positive corner positions during the excavation of the foundation pit was analyzed. The L-shaped corner pit model with different width-to-depth ratios(B/H, B and H are the width and depth of foundation pit respectively)of foundation pit was established, the spatial distribution law of the horizontal deformation of the supporting piles under the conditions of interaction between the negative and positive corner under different width-to-depth ratios was studied. The affected range of horizontal deformation of the supporting piles at different depths in the L-shaped corner area of the foundation pit was further clarified. The results show that when B/H<1.0, the range of the horizontal deformation of the shallow part of the supporting piles on the positive corner side affected by the corner effect shows a clear tendency to decrease with the increase of B/H, its value approximately satisfies 2.4H-B. When B/H>1.0, the horizontal deformation of the shallow part of the supporting piles on the positive corner side is affected by the corner effect in a range of about 1.5H. The horizontal deformation of the supporting piles at the bottom of the pit is not significantly affected by the width-to-depth ratio of the foundation pit and is affected by the corner effect in a range of about 0.6H. When B/H<1.0, the horizontal deformation of the shallow part of the support piles on the negative side is affected in a range of about 1.6H, and when B/H>1.0, its horizontal deformation is affected in a range of about 0.6H+B. The horizontal deformation of the support piles on the negative side at the location of the bottom of the excavation in the pit is affected in a range of about 0.6H+B, which is not obviously affected by the change of the width-to-depth ratio.

References:

[1] FINNO R J,BLACKBURN J T,ROBOSKI J F.Three-dimensional effects for supported excavations in clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(1):30-36.
[2]杨雪强,刘祖德,何世秀.论深基坑支护的空间效应[J].岩土工程学报,1998,20(2):74-78.
YANG Xueqiang,LIU Zude,HE Shixiu.Research about spatial effect of deep pit supporting [J].Chinese Journal of Geotechnical Engineering,1998,20(2):74-78.
[3]刘维正,葛孟源,万家乐,等.考虑空间效应的桩锚支护深大基坑变形特性及影响因素数值分析[J].铁道科学与工程学报,2021,18(12):3188-3200.
LIU Weizheng,GE Mengyuan,WAN Jiale,et al.Numerical analysis of deformation characteristics and influencing factors of deep and large foundation pit considering spatial effect[J].Journal of Railway Science and Engineering,2021,18(12):3188-3200.
[4]祁瑞武,邓会元,戴国亮.巨型基坑开挖对周围环境空间效应影响分析[J].水利与建筑工程学报,2021,19(2):178-184.
QI Ruiwu,DENG Huiyuan,DAI Guoliang.Analysis of giant foundation pit excavation influence on the spatial effect of surrounding environment[J].Journal of Water Resources and Architectural Engineering,2021,19(2):178-184.
[5]蒋希雁,张雷刚,任晓亮.基于MIDAS/GTS对悬臂式支护基坑空间效应的研究[J].建筑技术,2017,48(9):1002-1005.
JIANG Xiyan,ZHANG Leigang,REN Xiaoliang.Research of spatial effect for excavation of cantilever retaining structure by MIDEAS/GTS[J].Architecture Technology,2017,48(9):1002-1005.
[6]任彦华,李 军,樊继良,等.深基坑工程中空间效应的影响分析[J].地下空间与工程学报,2015,11(增1):177-182.
REN Yanhua,LI Jun,FAN Jiliang,et al.Analysis on space effect in deep foundation pit[J].Chinese Journal of Underground Space and Engineering,2015,11(S1):177-182.
[7]俞建霖,龚晓南.基坑工程变形性状研究[J].土木工程学报,2002,35(4):86-90.
YU Jianlin,GONG Xiaonan.Research on deformation of foundation-pit engineering[J].China Civil Engineering Journal,2002,35(4):86-90.
[8]杨晓华,陈 藤,刘龙海,等.某深基坑桩锚支护结构监测分析[J].湖南工业大学学报,2013,27(5):18-23.
YANG Xiaohua,CHEN Teng,LIU Longhai,et al.Analysis on monitoring of a deep foundation pit with pile-anchor retaining structure[J].Journal of Hunan University of Technology,2013,27(5):18-23.
[9]李连祥,张永磊,扈学波.基于PLAXIS 3D有限元软件的某坑中坑开挖影响分析[J].地下空间与工程学报,2016,12(增1):254-261,266.
LI Lianxiang,ZHANG Yonglei,HU Xuebo.Finite element analysis of a pit-in-pit excavation based on PLAXIS 3D [J].Chinese Journal of Underground Space and Engineering,2016,12(S1):254-261,266.
[10]SHI X,RONG C X,CHENG H,et al.Analysis on deformation and stress characteristics of a multibraced pit-in-pit excavation in a subway transfer station[J].Advances in Civil Engineering,2020,2020:8844461.
[11]TAN Y,WEI B,DIAO Y P,et al.Spatial corner effects of long and narrow multipropped deep excavations in Shanghai soft clay[J].Journal of Performance of Constructed Facilities,2014,28(4):04014015.
[12]楼春晖,夏唐代,刘念武.软土地区基坑对周边环境影响空间效应分析[J].岩土工程学报,2019,41(增1):249-252.
LOU Chunhui,XIA Tangdai,LIU Nianwu.Spatial effects of deformation due to excavation in soft clay [J].Chinese Journal of Geotechnical Engineering,2019,41(S1):249-252.
[13]ZHANG M,WANG X H,YANG G C,et al.Numerical investigation of the convex effect on the behavior of crossing excavations[J].Journal of Zhejiang University-Science A(Applied Physics & Engineering),2011,12(10):747-757.
[14]刘念武,龚晓南,俞 峰,等.内支撑结构基坑的空间效应及影响因素分析[J].岩土力学,2014,35(8):2293-2298,2306.
LIU Nianwu,GONG Xiaonan,YU Feng,et al.Analysis of spatial effects in strutted excavation and related influential factors[J].Rock and Soil Mechanics,2014,35(8):2293-2298,2306.
[15]葛晓永,王兴亚,宋林辉,等.狭长型地铁基坑的空间效应定量化研究[J].科学技术与工程,2021,21(20):8614-8620.
GE Xiaoyong,WANG Xingya,SONG Linhui,et al.Quantitative study on spatial effect of elongated metro foundation pit[J].Science Technology and Engineering,2021,21(20):8614-8620.
[16]李佳宇,陈 晨.坑角效应对基坑周围建筑物沉降变形影响的研究[J].岩土工程学报,2013,35(12):2238-2246.
LI Jiayu,CHEN Chen.Response of settlement and displacement of adjacent buildings of excavations to corner effect[J].Chinese Journal of Geotechnical Engineering,2013,35(12):2238-2246.
[17]吴瑞拓,顾晓强,高广运,等.基于HSS模型的上海地铁深基坑开挖变形分析[J].建筑科学与工程学报,2021,38(6):64-70.
WU Ruituo,GU Xiaoqiang,GAO Guangyun,et al.Analysis of deep excavation deformation of Shanghai metro station using HSS model[J].Journal of Architecture and Civil Engineering,2021,38(6):64-70.
[18]李连祥,成晓阳,黄佳佳,等.济南典型地层基坑空间效应规律研究[J].建筑科学与工程学报,2018,35(2):94-102.
LI Lianxiang,CHENG Xiaoyang,HUANG Jiajia,et al.Study on spatial effect of foundation pit in typical strata of Jinan[J].Journal of Architecture and Civil Engineering,2018,35(2):94-102.
[19]姚爱军,张新东.不对称荷载对深基坑围护变形的影响[J].岩土力学,2011,32(增2):378-382,388.
YAO Aijun,ZHANG Xindong.Influence of asymmetric load on supporting deformation for deep foundation pit[J].Rock and Soil Mechanics,2011,32(S2):378-382,388.
[20]豆红强,王 浩,吴福宝,等.带多阳角的综合管廊垂直交叉节点深基坑的坑角效应分析[J].工程地质学报,2018,26(6):1657-1665.
DOU Hongqiang,WANG Hao,WU Fubao,et al.Corner effects of deep excavations with multi exposed corners in square crossing of utility tunnel[J].Journal of Engineering Geology,2018,26(6):1657-1665.
[21]王晓伟,童华炜.考虑深基坑坑角效应的支护结构变形计算[J].地下空间与工程学报,2011,7(3):479-484.
WANG Xiaowei,TONG Huawei.Deformation calculation of supporting structure considering deep excavation pit corner[J].Chinese Journal of Underground Space and Engineering,2011,7(3):479-484.
[22]胡敏云,苟长飞,严昱翔,等.基坑宽度效应对基坑稳定性影响的有限元分析[J].地基处理,2020,2(1):1-8.
HU Minyun,GOU Changfei,YAN Yuxiang,et al.Finite element analysis of the effect of foundation pit width on its stability[J].Chinese Journal of Ground Improvement,2020,2(1):1-8.
[23]李 涛,杨依伟,贾奥运,等.空间效应下狭长深基坑地表三维变形预测[J].中国矿业大学学报,2020,49(6):1101-1110.
LI Tao,YANG Yiwei,JIA Aoyun,et al.Prediction of three-dimensional surface deformation of long and narrow deep foundation pit under spatial effect[J].Journal of China University of Mining & Technology,2020,49(6):1101-1110.

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Last Update: 2024-07-20