滨海沼泽区地铁车站深基坑开挖变形

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (2): 138-143.

滨海沼泽区地铁车站深基坑开挖变形

任晓敏^*1, 刘俊杰^2,3, 刘俊伟^2,4, 王晨²

1.中建八局轨道交通建设有限公司, 江苏南京 210046;
2.青岛理工大学土木工程学院, 山东青岛 266033;
3.潢川恒石市政建筑有限公司, 河南信阳 465150;
4.山东省高等学校蓝色经济区工程建设与安全协同创新中心, 山东青岛 266033

收稿日期:2020-07-28 出版日期:2023-04-28 发布日期:2023-05-05
通讯作者: 任晓敏(1987-),男,广东深圳人,高级工程师.Email:944235890@qq.com
基金资助:
山东省重点研发项目(2017GSF20107),国家自然科学基金(41502304)

Excavation deformation of deep foundationpit of subway station in coastal marsh area

REN Xiao-min¹, LIU Jun-jie^2,3, LIU Jun-wei^2,4, WANG Chen²

1. Rail Transit Construction Co. Ltd. of China Construction Eighth Engineering Division Corp. Ltd., Nanjing 210046, China;
2. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;
3. Huangchuan Hengshi Municipal Constrution Corp. Ltd., Xinyang 465150, China;
4. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao266033, China

Received:2020-07-28 Online:2023-04-28 Published:2023-05-05

摘要/Abstract

摘要： 滨海沼泽区狭长型地铁车站深基坑并不多,上部淤泥土和地下富水导致此类基坑开挖难度比较大.选取青岛地区此工况下的地铁车站深基坑开挖进行实时监测,并运用Midas GTS NX软件建立三维数值模型进行分析.分析表明:桩体深层水平位移-深度变形曲线呈现 “弓”形,最大围护桩水平位移出现在0.55H(H为基坑开挖深度);基坑周边地表沉降为小沉降量的抛物线形,最大沉降点距离基坑0.6H,沉降量约为0.058%H;围护桩最大水平位移δ_hmax与地表最大沉降量δ_vmax之间存在δ_vmax=0.88δ_hmax的关系.此外,与其他地区工况下的深基坑工程相比,沼泽区富水深基坑开挖变形呈现出相似的变化规律.

关键词: 滨海沼泽区, 狭长深基坑, 监测, 数值模拟

Abstract: There are not many deep foundation pits in long and narrow subway stations in coastal marsh area, which are difficult to excavate due to the effect of upper silt soil and rich underground water. The deep foundation pit excavation of the subway station under this condition in the Qingdao area is selected for real-time monitoring, and a three-dimensional numerical model is established by using Midas GTS NX software for analysis. The analysis shows that the deep horizontal displacement-depth deformation curve of the pile is in the shape of a bow, and the maximum horizontal displacement of retaining pile appears at 0.55H(H is the excavation depth of foundation pit). The surface settlement around the foundation pit is a parabola with a small settlement, and the maximum settlement is about 0.058%H, which is 0.6H away from the foundation pit. There is a relationship between the maximum horizontal displacement δ_hmax of the retaining wall and the maximum settlement δ_vmax of the surface, which is δ_vmax=0.88 δ_hmax. In addition, compared with the deep foundation pit engineering under the working conditions in other areas, the excavation deformation of the water-rich deep foundation pit in the marsh area shows a similar change law.

Key words: coastal marsh area, long and narrow deep foundation pit, monitoring, numerical simulation

中图分类号:

TU473.2

任晓敏, 刘俊杰, 刘俊伟, 王晨. 滨海沼泽区地铁车站深基坑开挖变形[J]. 兰州理工大学学报, 2023, 49(2): 138-143.

REN Xiao-min, LIU Jun-jie, LIU Jun-wei, WANG Chen. Excavation deformation of deep foundationpit of subway station in coastal marsh area[J]. Journal of Lanzhou University of Technology, 2023, 49(2): 138-143.

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