[1]卢卓,魏焕卫*.盾构掘进施工对既有基坑影响的理论分析[J].山东建筑大学学报,2019,34(04):43-49.[doi:10.12077/sdjz.2019.04.008]
 LU Zhuo,WEI Huanwei*.Analysis on lateral additional loads on adjacent foundation pit induced by shield advancing[J].Journal of Shandong jianzhu university,2019,34(04):43-49.[doi:10.12077/sdjz.2019.04.008]
点击复制

盾构掘进施工对既有基坑影响的理论分析()
分享到:

《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
34
期数:
2019年04期
页码:
43-49
栏目:
研究论文
出版日期:
2019-07-30

文章信息/Info

Title:
Analysis on lateral additional loads on adjacent foundation pit induced by shield advancing
文章编号:
1673-7644(2019)04-0043-07
作者:
卢卓魏焕卫*
(山东建筑大学 土木工程学院,山东 济南 250101)
Author(s):
LU ZhuoWEI Huanwei*
(School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China)
关键词:
盾构基坑支护附加应力Mindlin应力解土体损失
Keywords:
shield foundation pit support additional stress mindlin stress solution soil loss
分类号:
TU443
DOI:
10.12077/sdjz.2019.04.008
文献标志码:
A
摘要:
盾构掘进邻近既有基坑时,盾构施工的附加应力会对基坑产生影响,对其进行分析,可以为临近既有基坑时盾构掘进施工提供参考。文章基于Mindlin应力解与Sagaseta基本解,推导了有关盾构掌子面推力fs、盾壳摩阻力fm和盾构与开挖面的间隙引起的土体损失Vloss作用在支护结构上的附加应力荷载和应力的解析解,并将计算结果与实测数据进行对比。结果表明:沿盾构掘进方向,公式求解计算的附加应力值与实测数据在掌子面前(x>0)相似度较高,实测数据最大值出现在掌子面位置(x=0),而计算结果的最大值出现在掌子面前0.25D位置(x=0.25D);沿掘进方向,在掌子面前可按计算值进行计算,0.25D后附加应力开始减小,附加应力最大值与实测最大值差别不大,可按计算的附加应力最大值对支护结构进行验算;x>1.0D时,fm为支护结构的主要影响因素,而 0.25D <x<0.75D时,fs为支护结构的主要影响因素,Vloss产生的附加应力自1.0D开始增加,x>1.0D时其值很小,可以忽略不计,土体损失产生的附加应力对支护结构的影响发挥次要作用。
Abstract:
When shield tunneling is near the existing foundation pit, the additional stress of shield tunneling will affect the supporting structure. The analysis can provide reference for shield tunneling construction near existing foundation pit. This paper makes a theoretical analysis and provides a basis for this condition. Based on the Mindlin stress solution and the fundamental solution, analytical solution of additional stress load and stress of the shield face thrust fs, the shield shell friction resistance fm and the soil loss caused by gap between shield and excavation face(Vloss) on supporting structure. Comparing the calculated results with the measured data, it is found that the calculated additional stress value along the shield tunneling direction formula is similar to the measured data in front of the face(x>0); the maximum value of measured data appears on the palm surface(x=0), the maximum value of the result appears in front of the palm(x=0.25D). When x is greater than 1.0D, fm is the main influencing factor of supporting structure; when x is between 0.75D and 0.25D, fs is the main influencing factor of supporting structure; the additional stress caused by soil loss increases from 1.0D, more than 1.0D is negligible, additional stress caused by soil loss plays a minor role in supporting structure.

参考文献/References:

[1]张琼方, 林存刚, 丁智, 等. 盾构近距离下穿引起已建地铁隧道纵向变形理论研究[C].上海:中国土木工程学会第十二届全国土力学及岩土工程学术大会,2015:568-572.[2]王涛, 徐日庆, 齐静静. 盾构掘进引起的土体附加应力场分析[J]. 浙江大学学报(工学版), 2008, 42(11):2009-2014.[3]赵玉勃, 张忠苗. 盾构法隧道推进引起周围土体的附加应力分析[J]. 岩土工程学报, 2010, 28(9):1386-1391.[4]武崇福, 魏超, 乔菲菲. 既有上部建筑荷载下盾构施工引起土体附加应力分析[J]. 岩石力学与工程学报, 2018,37(7):1708-1721.[5]张润峰, 梁荣柱, 张献民. 盾构掘进引起的邻近桩基水平附加荷载分析[J]. 中南大学学报(自然科学版), 2017,48(2):473-483.[6]徐林. 盾构隧道施工对邻近建筑物的影响研究[D].杭州: 浙江大学,2017.[7]曾英俊. 双线盾构长距离穿越深基坑底部对基坑围护侧移及内力的影响[J]. 工业建筑, 2014(s1):882-887.[8]殷榕鹏. 近距离双线平行盾构隧道开挖相互影响与地表沉降预测研究[D].厦门:华侨大学,2017.[9]Mindlin R D . Force at a point in the interior of a semi-infinite solid[J]. Physics, 1936, 7(5): 195–201.[10]Sagaseta C. Analysis of undraind soil deformation due to ground loss[J]. Géotechnique, 1987, 37(3):301-320.[11]王洪新. 土压平衡盾构刀盘挤土效应及刀盘开口率对盾构正面接触压力影响[J]. 土木工程学报, 2009, 42(7): 113-118.[12]朱合华, 徐前卫, 廖少明,等. 土压平衡盾构施工的顶进推力模型试验研究[J]. 岩土力学, 2007, 28(8):1587-1594.[13]Stein D, Mollers K, Bielecki R. Microtunneling[M]. Berlin: Verlag Ernst & Sohn, 1989.[14]魏纲. 盾构法隧道统一土体移动模型的建立[J]. 岩土工程学报, 2007, 29(4):554-559.[15]Lee K M , Rowe R K , Lo K Y . Subsidence owing to tunnelling. I. Estimating the gap parameter[J]. Canadian Geotechnical Journal, 1992, 29(6):929-940.[16]Pinto F, Whittle A J. Ground movements due to shallow tunnels in soft ground. I: analytical solutions[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 140(4): 1-17.[17]王闯, 彭祖昭, 苟超, 等. 盾构近接下穿群桩基础施工影响分区研究[J]. 土木工程学报, 2017,50(s2):174-181.[18]张冬梅, 黄宏伟, 王箭明. 地铁盾构施工对相邻深基坑开挖的实测影响分析[J]. 水电与抽水蓄能, 2001, 25(3):19-22.

相似文献/References:

[1]罗晓,孔军,魏焕卫.托换支护法中托换桩变形影响因素的数值分析[J].山东建筑大学学报,2010,(02):145.
 LUO Xiao,KONG Jun,WEI Huan-wei.Numerical analysis of effect of underpinning pile on excavation bracing [J].Journal of Shandong jianzhu university,2010,(04):145.

备注/Memo

备注/Memo:
收稿日期:2019-07-10基金项目:山东建筑大学横向课题项目(山东电力工程咨询院有限公司K22014016)作者简介:卢卓(1995-),男,在读硕士,主要从事地基基础与基坑支护新技术等方面的研究. E-mail:452601671@qq.com通讯作者* :魏焕卫(1974- ),男,副教授,博士,主要从事岩土工程共同作用和变形控制等方面的研究.E-mail:13181718169@163.com
更新日期/Last Update: 2019-07-31