Protective effect of partition excavations of a large-deep foundation pit on adjacent tunnels in soft soils: a case study

Bian, Xuecheng; Hu, Haoqiang; Zhao, Chuang; Ye, Junneng; Chen, Yunmin

doi:10.1007/s10064-021-02256-9

Cited by 26 publications

(10 citation statements)

References 37 publications

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“…So far, the protective effect obtained by using partition excavation in large deep foundation pits is not clear. He performed 3D numerical analysis and combined the constitutive model of the study to study the protective effect of partition wall excavation [ 6 ].…”

Section: Related Workmentioning

confidence: 99%

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Liu

Jia

et al. 2022

Computational Intelligence and Neuroscience

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Since the 1990s, with the continuous advancement of urbanization, the proportion of urban population has gradually increased. There is a serious shortage of land resources, and people’s demand for underground space is increasing day by day. The construction of subway stations has developed into an inevitable trend in the future construction engineering industry, and it is also necessary to select the best solution from various solutions. The purpose of this paper is to study how to evaluate and analyze the economy of the deep foundation pit envelope structure of subway stations based on fuzzy logic, so as to choose the optimal and most economical plan. This paper proposes a fuzzy comprehensive evaluation method based on fuzzy logic, which is a reasonable method for the classic evaluation index. The experimental results of this paper show that in 2015 about 8% of people chose to travel by subway. By 2020, 54.5% of people chose to travel by subway, an increase of 46.5% during this period. It can be seen that more and more people are willing to take the subway, and subway transportation is a public transportation mode with large transportation volume. It has obvious public welfare, and it can relieve the urban traffic pressure very well, so the investment in subway construction in various cities is also increasing.

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Section: Related Workmentioning

confidence: 99%

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Liu

Jia

et al. 2022

Computational Intelligence and Neuroscience

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“…For this, the deformation values of the retaining structure and the settlement values of the railway subgrade with 18 m is required to strictly control within the design range. The safety control target of the foundation pit includes the deformation limit of the adopted retaining structure (Huang et al, 2020a;Huang et al, 2021), ground surface settlement, subgrade settlement, track smoothness, groundwater seepage (Zhang et al, 2016;Huier and Shoude, 2020;Bai et al, 2021b), foundation pit or side slope safety (Yang and Bai, 2019;Huang et al, 2020b;Bian et al, 2021), etc.…”

Section: Design Of Retaining and Protection Structurementioning

confidence: 99%

Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control

Wang

Chen

Cao³

et al. 2021

Front. Earth Sci.

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Considering the deep foundation pit of a car dumper room close to the Beijing–Baotou railway, the countermeasures of the foundation pit design are analyzed according to the surrounding environment and stratum conditions. Through Midas GTS software as well as field measured results, the construction effect on the adjacent railway subgrade is discussed. Therefore, the deformation characteristics of the foundation pit as well as the retaining structure, including the railway subgrade, caused by the excavation process, are revealed. The results show that the five-sided water-stop structure formed by cement piles around and at the bottom of the pit avoids the consolidation settlement of the adjacent railway subgrade caused by deep dewatering and also reduces the lateral displacement (i.e., in a horizontal direction) and the heave of the pit bottom. As a result, the lateral displacement near the railway side is larger than that of the retaining structure on the other side due to the subgrade on the pit side. The cross-lot bracing across the foundation pit will transfer the bias pressure of the subgrade to the retaining structure far away from the railway, while the transfer effect of the knee bracing is not obvious. The deformation of the railway subgrade and its evolution rate caused by the removal of internal bracing is significantly greater than the subgrade deformation and the change rate of deformation caused by excavation. The research results provide useful guidance for the deep foundation pit design.

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“…Previous research has indicated that the primary factors influencing excavation deformation include the excavation geometry, support forms, seepage inflow rates, excavation soil, and excavation sequences [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Some scholars have optimized excavation design schemes through quantitative studies on individual influencing factors [ 28 , 29 , 30 , 31 , 32 ], providing new insights into excavation construction processes.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Law of Foundation Excavation and Support Based on Fluid–Solid Coupling Theory

Xia,

Zhao,

Wang

et al. 2024

Sensors

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To investigate the impact of underground water seepage and soil stress fields on the deformation of excavation and support structures, this study initially identified the key influencing factors on excavation deformation. Subsequently, through a finite element simulation analysis using Plaxis, this study explored the effects of critical factors, such as the excavation support form, groundwater lowering depth, permeability coefficient, excavation layer, and sequence on excavation deformation. Furthermore, a comprehensive consideration of various adverse factors was integrated to establish excavation support early warning thresholds, and optimal dewatering strategies. Finally, this study validated the simulation analysis through an on-site in situ testing with wireless sensors in the context of a physical construction site. The research results indicate that the internal support system within the excavation piles exhibited better stability compared to the external anchor support system, resulting in a 34.5% reduction in the overall deformation. Within the internal support system, the factors influencing the excavation deformation were ranked in the following order: water level (35.5%) > permeability coefficient (17.62%) > excavation layer (11.4%). High water levels, high permeability coefficients, and multi-layered soils were identified as the most unfavorable factors for excavation deformation. The maximum deformation under the coupled effect of these factors was established as the excavation support early warning threshold, and the optimal dewatering strategy involved lowering the water level at the excavation to 0.5 m below the excavation face. The on-site in situ monitoring data obtained through wireless sensors exhibited low discrepancies compared to the finite element simulation data, indicating the high precision of the finite element model for considering the fluid–structure interaction.

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Protective effect of partition excavations of a large-deep foundation pit on adjacent tunnels in soft soils: a case study

Cited by 26 publications

References 37 publications

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Comparison and Economic Envelope Structure Schemes for Deep Foundation Pit of Subway Stations Based on Fuzzy Logic

Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control

Research on the Deformation Law of Foundation Excavation and Support Based on Fluid–Solid Coupling Theory

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