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

卷:

40卷

期数:

2023年04期

页码:

144-152

栏目:

隧道工程

出版日期:

2023-07-10

文章信息/Info

Title:

Safety monitoring and analysis of shield ultra-deep receiving well excavation in mixed stratum

文章编号:

1673-2049(2023)04-0144-09

作者:

孙泽信^1,2,王永琛^1,3,卢彦竹²,王南周²,薛怀宇²

(1. 东北大学 深部金属矿山安全开采教育部重点实验室,辽宁 沈阳 110819; 2. 江苏省地质工程勘察院,江苏 南京 210019; 3. 东北大学 深部工程与智能技术研究所,辽宁 沈阳 110819)

Author(s):

SUN Zexin^1,2, WANG Yongchen^1,3, LU Yanzhu², WANG Nanzhou², XUE Huaiyu²

(1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, Liaoning, China; 2. Geo-engineering Investigation Institute of Jiangsu Province, Nanjing 210019, Jiangsu, China; 3. Institute of Deep Engineering and Intelligent Technology, Northeastern University, Shenyang 110819, Liaoning, China)

关键词:

基坑工程;  超深开挖;  混合地层;  支护结构;  深度效应;  变形性状

Keywords:

foundation pit engineering;  ultra-deep excavation;  mixed stratum;  retaining structure;  depth effect;  deformation behavior

分类号:

TU473

DOI:

10.19815/j.jace.2021.11049

文献标志码:

A

摘要:

以南京某过江隧道45.4 m黏土-砂岩混合地层超深盾构井接收基坑为研究对象,结合地质勘察数据及施工日志,对该超深基坑开挖支护过程中的地连墙顶部隆沉、深层侧向变形及立柱隆沉等支护体系实测数据进行分析,探讨该混合地层超深基坑的变形性状。结果表明:当基坑开挖深度小于20 m时各监测点的最大变形位置H_m位于0.34H_e～1.28H_e(H_e为开挖深度)之间,开挖深度超过20 m时侧向变形位置基本不发生变化; 混合地层的开挖对基坑地连墙的深层侧向变形具有较大的影响,黏土地层的开挖具有明显的深度效应,但砂岩地层的开挖深度效应并不明显; 案例的地连墙最大水平位移δ_hm在0.013%H_e～0.044%H_e之间,位移量较小,支护体系的完整性对地连墙的位移具有较好的抑制作用; 当开挖深度较大时,由于承压含水层覆土厚度的降低出现短暂的回弹作用,使得立柱、地连墙出现隆起现象; 支护体系的隆沉具有明显的同步相关性。

Abstract:

The 45.4 m ultra-deep shield well receiving foundation pit in clay-sandstone mixed stratum of a Nanjing river-crossing tunnel was used as the research object. Based on geological survey data and construction logs, the measured data of the support system for the excavation and support process of the ultra-deep foundation pit, including the top uplift of the diaphragm wall, deep lateral deformation and column uplift were analyzed. The deformation behavior of the ultra-deep foundation pit in the mixed stratum was discussed. The results show that the position of maximum deformation H_m is between 0.34H_e and 1.28H_e(H_e is the excavation depth)when the excavation depth of the foundation pit is less than 20 m. The lateral deformation position basically does not change when the excavation depth exceeds 20 m. The excavation of mixed stratum has a great influence on the deep lateral deformation of the diaphragm wall of the foundation pit. The excavation of clay soil layer has obvious depth effect, but the excavation depth effect of sandstone strata is not obvious. In the case, the maximum lateral deformation δ_hm of diaphragm wall varies between 0.013%H_e and 0.044%H_e, and the displacement is small. The integrity of the supporting system has a good inhibitory effect on the displacement of the diaphragm wall. When the excavation depth is large, the reduction of the thickness of the confined aquifer will cause a short-term rebound effect, which will cause the uplift of the column and the diaphragm wall. The uplift and subsidence stage of the entire support system has obvious synchronization correlation.

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相似文献/References:

[1]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(06):64.[doi:10.19815/j.jace.2021.08055]
　WU Rui-tuo,GU Xiao-qiang,GAO Guang-yun,et al.Analysis of Deep Excavation Deformation of Shanghai Metro Station Using HSS Model[J].Journal of Architecture and Civil Engineering,2021,38(04):64.[doi:10.19815/j.jace.2021.08055]

备注/Memo

备注/Memo:

收稿日期:2021-11-09
基金项目:国家自然科学基金项目(11902069); 中央高校基本科研业务费专项资金项目(N180105031)
作者简介:孙泽信(1983-),男,工学硕士,高级工程师,E-mail:wangyongchen1213@163.com。

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更新日期/Last Update: 2023-07-01