[1]郑镇跡,曹利强,苏栋,等.隔离桩对隧道开挖引起沉降的控制效能分析[J].深圳大学学报理工版,2022,39(6):615-621.[doi:10.3724/SP.J.1249.2022.06615]
 ZHENG Zhenji,CAO Liqiang,SU Dong,et al.Efficiency investigation of mitigation effect of isolation piles on tunneling-induced ground settlements[J].Journal of Shenzhen University Science and Engineering,2022,39(6):615-621.[doi:10.3724/SP.J.1249.2022.06615]
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隔离桩对隧道开挖引起沉降的控制效能分析()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第39卷
期数:
2022年第6期
页码:
615-621
栏目:
土木与建筑工程
出版日期:
2022-11-15

文章信息/Info

Title:
Efficiency investigation of mitigation effect of isolation piles on tunneling-induced ground settlements
文章编号:
202206001
作者:
郑镇跡曹利强苏栋陈湘生
1)深圳大学土木与交通工程学院,广东深圳 518060;2)深圳大学滨海城市韧性基础设施教育部重点实验室,广东深圳 518060;3)深圳市地铁地下车站绿色高效智能建造重点实验室,广东深圳 518060
Author(s):
ZHENG Zhenji CAO Liqiang SU Dong CHEN Xiangsheng
1) College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China 2) Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE), Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China 3) Shenzhen Key Laboratory of Green, Efficient and Intelligent Construction of Underground Metro Station, Shenzhen 518060, Guangdong Province, P.R.China
关键词:
岩土工程隧道开挖隔离桩地层沉降变形控制数值仿真
Keywords:
geotechnical engineering tunnel excavation isolation pile ground settlements deformation control numerical simulation
分类号:
TU4
DOI:
10.3724/SP.J.1249.2022.06615
文献标志码:
A
摘要:
为研究隔离桩对地表及深层土体沉降的控制效能,对Plaxis2d中模拟隔离桩的实现方法进行分析,建立“隧道-隔离桩”相互作用有限元模型,研究桩长、桩径、桩顶埋深、桩水平位置以及隧道埋深等参数对控制效能的影响. 结果表明,隔离桩对地表及地层深层土体沉降的控制效能不同,在设置隧道均匀径向收缩模式下,对地表而言桩长的影响最为明显,实际工程中至少应深入隧道底部一倍半径以保证对地表沉降的控制效果;隔离桩设置得离隧道越近,控制效能越好,尤其是对深层土体沉降的控制;桩径在 0.6~1.4 m内变化对隔离桩沉降控制效能影响不明显;埋入式隔离桩对地表沉降的控制效能与非埋入式相比差别不大,但对地层深层土体的沉降控制效能明显优于非埋入式;对于相同的隔离桩,隧道埋深越深,隔离桩对地表沉降的控制效能越低. 隔离桩对一定范围的深层土体沉降控制效率基本为负值,说明隔离桩的设置反而加大了深层土体原有沉降,出现负面效果. 研究可为隔离桩的设计施工提供参考.
Abstract:
In order to evaluation and analysis the control efficiency of isolation pile on surface and deep soil settlement, the implementation method of simulated isolation pile in Plaxis2d was analyzed,and the finite element model of "tunnel isolation pile" interaction was established. By changing the parameters of pile length, pile diameter, pile top buried depth, pile horizontal position and tunnel buried depth, the control effect of isolation pile on surface and deep soil settlement was studied.The results show that the isolation pile on the surface and deep soil strata subsidence control effectiveness is different.Pile length for the surface effect is most obvious, at least in practical projects should be one radius at the bottom of the deep tunnel to ensure the control effect on surface subsidence.The closer the isolation pile is to the tunnel, the better its control efficiency is, especially to the settlement of deep soil. Within 0.6 ~ 1.4 m pile diameter changes on the isolation is of little influence on the pile settlement control effectiveness;The control efficiency of buried isolation piles on ground settlement is not much different from that of non-buried ones, but the control efficiency of deep soil settlement in the ground is obviously better; For the same isolation pile, the deeper the tunnel is buried, the lower the control efficiency of the isolation pile on surface settlement. In this study, the control efficiency of isolation piles on the settlement of deep soil mass is basically negative, indicating that the placement of isolation piles increases the original settlement of deep soil mass on the contrary, resulting in negative effects. The research can provide reference for the design and construction of isolation pile.

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更新日期/Last Update: 2022-11-30