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

卷:

42卷

期数:

2025年06期

页码:

177-187

栏目:

岩土工程

出版日期:

2025-11-25

文章信息/Info

Title:

Research on deformation characteristics of deep excavations in upper-soft and lower-hard composite strata during construction period based on unit tracking method

文章编号:

1673-2049(2025)06-0177-11

作者:

徐文田¹,王艳红¹,张宇¹,梅源²,刘文占^2,3,周东波²

(1.广州地铁设计研究院股份有限公司,广东 广州 510010; 2. 西安建筑科技大学 土木工程学院,陕西 西安 710055; 3. 中国建筑第二工程局有限公司华中公司,湖北 武汉 430056)

Author(s):

XU Wentian¹, WANG Yanhong¹, ZHANG Yu¹, MEI Yuan², LIU Wenzhan^2,3, ZHOU Dongbo²

(1. Guangzhou Metro Design & Research Institute Co., Ltd, Guangzhou 510010, Guangdong, China; 2. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 3. China Construction Second Engineering Bureau Co., Ltd. Central China Company, Wuhan 430056, Hubei, China)

关键词:

深基坑;  上软下硬复合地层;  围护结构;  降水;  变形特性;  单元追踪法

Keywords:

deep excavation;  upper-soft and lower-hard composite strata;  enclosure structure;  precipitation;  deformation characteristic;  element tracking method

分类号:

TU74

DOI:

10.19815/j.jace.2024.11032

文献标志码:

A

摘要:

为研究降水影响下软-硬复合地层中深基坑变形特性,解决传统单元生死法建模精度低、易出现非真实回弹的问题,以广州市棠溪综合枢纽铁路部分的基坑工程为背景,结合多孔弹性模型与修正剑桥模型建立数值模型。采用单元追踪法(通过共节点单元复制与材料属性动态分配,实现围护结构、地层和内支撑的协同建模)模拟了降水引发的渗流效应和施工对基坑变形的影响,分析了降水对土体孔压及变形的影响。结果表明:基坑变形主要由降水固结与坑内土体卸载共同作用引起; 围护结构侧向变形从线性向“C形”非线性变化,最大位移位于39.65～43.51 mm之间,墙后地表沉降显著增加,最大沉降达到45.69 mm,且沉降影响区范围为开挖深度的1.0倍～1.5倍; 降水条件下支撑轴力变化显著,第二道支撑的轴力在两种工况下分别达到2 126.3 kN和2 189.3 kN,施加300 kN预应力后基坑变形得到有效控制,验证了该方案的合理性与实践价值。

Abstract:

In order to study the deformation characteristics of deep foundation pit in soft-hard composite stratum under the influence of precipitation, and to solve the problems of low modeling accuracy and non-real rebound of traditional element birth and death method, a numerical model was established by combining porous elastic model and modified Cambridge model based on the foundation pit project of railway part of Tangxi integrated hub in Guangzhou. The unit tracking method(employing co-node element replication and dynamic material property allocation, achieving integrated modeling of retaining structures, strata, and internal supports)was used to simulate the seepage effects induced by dewatering and the impact of construction on excavation deformation,and the effects of dewatering on pore pressure and soil deformation were analyzed. The results show that the excavation deformation is primarily caused by dewatering-induced consolidation and soil unloading within the pit. The lateral deformation of the retaining structure transitioned from linear to a “C-shaped” non-linear pattern, with maximum displacements of 39.65-43.51 mm. The ground settlement behind the wall increases significantly, and the maximum settlement reaches 45.69 mm, and the range of settlement affected area is 1.0 times to 1.5 times of the excavation depth. Under the condition of dewatering, the axial force of the support changes significantly, and the axial force of the second support reaches 2 126.3 kN and 2 189.3 kN respectively under the two working conditions. After applying 300 kN prestress, the deformation of the foundation pit is effectively controlled, and the rationality and practical value of the scheme are verified.

参考文献/References:

[1] 郑 刚,朱合华,刘新荣,等.基坑工程与地下工程安全及环境影响控制[J].土木工程学报,2016,49(6):1-24.
ZHENG Gang, ZHU Hehua, LIU Xinrong, et al. Control of safety of deep excavations and underground engineering and its impact on surrounding environment[J]. China Civil Engineering Journal, 2016, 49(6): 1-24.
[2]ROY D, ROBINSON K E. Surface settlements at a soft soil site due to bedrock dewatering[J]. Engineering Geology, 2009, 107(3/4): 109-117.
[3]倪小东,张宇科,陆江发,等.地层局部沉陷诱发有压管道渗透侵蚀机制研究[J].华中科技大学学报(自然科学版),2025,53(2):17-24.
NI Xiaodong, ZHANG Yuke, LU Jiangfa, et al. Study on mechanism of seepage erosion of pressure pipeline induced by local subsidence of stratum[J]. Journal of Huazhong University of Science and Technology(Natural Science Edition), 2025, 53(2): 17-24.
[4]WU J P, YU J P, FANG F G, et al. Impact of excavation on adjacent elevated bridges and optimization analysis of deformation control[J]. Buildings, 2024, 14(10): 3197.
[5]HU W D, HU T, LIN S C, et al. Experimental study on deformation and passive earth pressure behind cantilever pile retaining walls in narrow excavations[J]. Geotechnical and Geological Engineering, 2024, 42(8): 7041-7061.
[6]魏 星,陈 睿,程世涛,等.成都膨胀土地区深基坑降雨稳定性分析与变形预测[J].岩土力学,2024,45(增1):525-534.
WEI Xing, CHEN Rui, CHENG Shitao, et al. Rainfall stability analysis and deformation prediction of deep foundation pit in Chengdu expansive soil area[J]. Rock and Soil Mechanics, 2024, 45(S1): 525-534.
[7]伍成君.基坑开挖过程中围护体及周边环境变形分析[J].建筑施工,2024,46(7):1076-1079,1084.
WU Chengjun. Analysis on deformation of retaining structure and surrounding environment during foundation pit excavation[J]. Building Construction, 2024, 46(7): 1076-1079, 1084.
[8]李吉林,尹爱月,魏焕卫,等.开挖宽度对异形基坑L形转角区支护结构变形影响研究[J].建筑科学与工程学报,2024,41(4):159-170.
LI Jilin, YIN Aiyue, WEI Huanwei, et al. Study on influence of excavation width on deformation of supporting structure in L-shaped corner area of shaped foundation pit[J]. Journal of Architecture and Civil Engineering, 2024, 41(4): 159-170.
[9]梅 源,张苗苗,周东波,等.西安湿陷性黄土地区狭长深基坑变形分析[J].重庆交通大学学报(自然科学版),2024,43(7):17-25.
MEI Yuan, ZHANG Miaomiao, ZHOU Dongbo, et al. Long and narrow deep foundation pit deformation in Xi'an collapsible loess region[J]. Journal of Chongqing Jiaotong University(Natural Science), 2024, 43(7): 17-25.
[10]张乃烊.滨海花岗岩残积土地层异型深基坑开挖的变形特性研究[D].福州:福州大学,2017.
ZHANG Naiyang. Study on deformation characteristics of abnormal deep foundation pit excavation in coastal granite residual soil stratum[D]. Fuzhou: Fuzhou University, 2017.
[11]杨清源,赵伯明.潜水层基坑降水引起地表沉降试验与理论研究[J].岩石力学与工程学报,2018,37(6):1506-1519.
YANG Qingyuan, ZHAO Boming. Experimental and theoretical study on the surface subsidence by dewatering of foundation pit in phreatic aquifer[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(6): 1506-1519.
[12]TAN W, LEI Z Y, WANG Y H, et al. Analyzing the impact of deep excavation on retaining structure deformation based on element tracking[J]. Buildings, 2024, 14(10): 3069.
[13]李广信.高等土力学[M].2版.北京:清华大学出版社,2016.
LI Guangxin. Advanced soil mechanics[M]. 2nd ed. Beijing: Tsinghua University Press, 2016.
[14]费 康,彭 劼.ABAQUS岩土工程实例详解[M].北京:人民邮电出版社,2017.
FEI Kang, PENG Jie. Detailed explanation of ABAQUS geotechnical engineering example[M]. Beijing: Posts & Telecom Press, 2017.
[15]郭利娜,胡 斌,李方成,等.武汉地铁深基坑围护结构钢支撑轴力研究[J].地下空间与工程学报,2013,9(6):1386-1393.
GUO Lina, HU Bin, LI Fangcheng, et al. The study on axial force of steel shotcrete protective structures on deep foundation pit in Wuhan subway[J]. Chinese Journal of Underground Space and Engineering, 2013, 9(6): 1386-1393.
[16]徐中华,王卫东,宗露丹,等.软土地层45 m级超深基坑工程实测变形性状分析[J].建筑结构,2024,54(10):118-127.
XU Zhonghua, WANG Weidong, ZONG Ludan, et al. Analysis on measured deformation performance of 45 m class ultra-deep foundation pit project in soft soil layer[J]. Building Structure, 2024, 54(10): 118-127.
[17]TANNER BLACKBURN J, FINNO R J. Three-dimensional responses observed in an internally braced excavation in soft clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(11): 1364-1373.
[18]徐昭辰,王 强,章定文,等.基坑混凝土支撑轴力监测值修正方法[J].建筑科学与工程学报,2021,38(6):48-54.
XU Zhaochen, WANG Qiang, ZHANG Dingwen, et al. Correction method of axial force monitoring value of concrete strut in excavation[J]. Journal of Architecture and Civil Engineering, 2021, 38(6): 48-54.
[19]仲志武.十字斜交换乘车站基坑优化方案对比[J].建筑科学与工程学报,2023,40(1):150-158.
ZHONG Zhiwu. Comparison of foundation pit optimization schemes of cross oblique transfer station[J]. Journal of Architecture and Civil Engineering, 2023, 40(1): 150-158.
[20]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.
[21]李煜峰,傅 怡,徐中华.软土地区紧邻地铁隧道深基坑支护设计与实践[J].建筑科学与工程学报,2021,38(6):128-137.
LI Yufeng, FU Yi, XU Zhonghua. Supporting design and application of deep excavation adjacent to metro tunnels in soft soil area[J]. Journal of Architecture and Civil Engineering, 2021, 38(6): 128-137.
[22]杨晓华,张天阳,王志丰.富水砂层深基坑桩锚支护参数对邻近城市道路的影响[J].建筑科学与工程学报,2025,42(1):157-166.
YANG Xiaohua, ZHANG Tianyang, WANG Zhifeng. Influence of pile-anchor supporting parameters of deep foundation pit in water-rich sand layer on adjacent urban roads[J]. Journal of Architecture and Civil Engineering, 2025, 42(1): 157-166.
[23]郭院成,张博闻,孟 潮,等.堆土加卸载与基坑开挖叠加对既有隧道变形的影响研究[J].建筑科学与工程学报,2023,40(1):142-149.
GUO Yuancheng, ZHANG Bowen, MENG Chao, et al. Study on influence of soil loading and unloading and foundation pit excavation superposition on existing tunnel deformation[J]. Journal of Architecture and Civil Engineering, 2023, 40(1): 142-149.

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　WU Bo,XIA Qian,LIU Cong,et al.Deformation reliability analysis of subway deep foundation pit under complex environment[J].Journal of Architecture and Civil Engineering,2024,41(06):173.[doi:10.19815/j.jace.2022.09107]

备注/Memo

备注/Memo:

收稿日期:2024-11-08
基金项目:住房和城乡建设部研究开发项目(2022-K-044)
作者简介:徐文田(1985-),男,高级工程师, E-mail:Xuwentian_1985@126.com。

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更新日期/Last Update: 2025-11-25