Design optimization of the soil nail wall-retaining pile-anchor cable supporting system in a large-scale deep foundation pit

Liu, Lulu; Wu, Ruigang; Congress, Surya Sarat Chandra; Qin-wen, DU; Cai, Guojun; Li, Zhe

doi:10.1007/s11440-021-01154-4

Cited by 43 publications

(12 citation statements)

References 31 publications

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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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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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“…Li et al [18,19] conducted a study of the deformation characteristics of irregular foundation pits using a combination of on-site monitoring and numerical simulations, and found that the pit coner has a restraining effect on the deformation of the diaphragm wall. Liu et al [20] analyzed the displacement of the retaining wall, surface settlement, and surrounding building settlement data of large deep foundation pits, evaluated the spatial effect of the corners of the foundation pit using the analysis results, and optimized the support structure of the corners of the foundation pit, thereby reducing construction costs. Wu et al [21] analyzed the deformation law of the retaining wall under the effect of spatial effects based on on-site monitoring data during the excavation process of foundation pits in soft soil areas.…”

Section: Introductionmentioning

confidence: 99%

Spatial Effect Analysis of a Long Strip Pit Partition Wall and Its Influence on Adjacent Pile Foundations

Zhou

Yang

2023

Sustainability

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The spatial effect at the end of the foundation pit partition wall is significant, and the displacement of the retaining wall and soil caused by its demolition leads to an additional displacement and bending moment of the adjacent pile foundations, which in turn deteriorates the work behavior of the pile foundation. Taking the project of an open tunnel under a viaduct located in Hangzhou as an example, site monitoring was performed to determine the effect of the demolition of the partition wall on the displacement of the surrounding retaining wall and the soil in the adjacent area and the monitoring data were compared to the finite element analysis results to check the rationality of the finite element model. This model was used to study the influence of the distance from the pile foundation to the partition wall as well as the stiffness of the retaining wall on the displacement and bending moment of the pile foundation during excavation. These results indicate that because of the support effect of the foundation pit partition wall on the retaining wall, the spatial effect at the end of the partition wall is large, and the displacement and bending moments of the pile foundation in the vicinity of the partition wall are lower than those in the far distance. Demolition of the partition wall will increase the displacement and bending moment of adjacent pile foundations, and this effect decreases with increasing distance. The range of influence of the spatial effect at the end of the partition wall is approximately 1.1 times the depth of the foundation pit. When the pile foundation is in the immediate vicinity of the partition wall, the response of the front-row and rear-row piles to the demolition of the partition wall is significantly different. The front row piles are more affected, while the rear row piles are less affected. As the distance increases, the difference in response gradually decreases and tends to be consistent. As the stiffness of the retaining wall increases, the effect of the demolition of the partition wall on the pile foundation decreases. It is recommended that the stiffness of the supporting system near the partition wall be reduced appropriately, and the partition wall should be set at the foundation pit section near the pile foundation, but the response of the foundation pit and the adjacent pile foundation should be paid close attention to when the partition wall is demolished.

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“…Researchers noticed the significance of particle breakage for macro-scale behavior back in the middle of the twentieth century [18][19][20], and many researchers investigated the effect of particle breakage on compression and shearing behavior by applying element testing, i.e., on the mesoscale, thereafter [4,11,13,21,22]. The amount of particle breakage was found to be closely related to external factors, including stress magnitude [11], shearing strain [4], stress path [22], saturation condition [23], and the duration of the load [13,24].…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size and Constraint Conditions on Single Particle Strength of Carbonate Sand

Cai

Gao

et al. 2022

Sensors

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Carbonate sand is often encountered and utilized as construction material in offshore engineering projects. Carbonate sand particles, which are porous and angular, are found to be highly crushable under high stress conditions, whereas the mechanisms and controlling factors for the crushing of carbonate sand particles are not well developed. The crushability and particle strength of around 400 particles from three fractions (5–10 mm, 2–5 mm, and 1–2 mm) of carbonate sand from the South China Sea were investigated via grain-scale single particle crushing tests. Special emphasis was placed on the effect of external constraint conditions (i.e., coordination number) and intrinsic particle morphology characteristics on the particle strength of carbonate soil. The particle strength of carbonate sand was found to be around half of quartz sand in terms of characteristic stress. Negative correlations, which could be depicted by an exponential equation, were found between the particle size and particle strength. Due to elongated particle shape and tensile stress concentration, a higher coordination number may lower the particle strength, which contradicts what was reported for quartz sands. A series of seven fundamental particle dimensions and five particle shape descriptors was characterized, and the aspect ratio was found to be one of the more influential shape descriptors for particle strength. The results enriched the database for the analysis of highly irregular geomaterial and provided insights into controlling factors of particle strength and crushing mechanisms of the carbonate sand.

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Design optimization of the soil nail wall-retaining pile-anchor cable supporting system in a large-scale deep foundation pit

Cited by 43 publications

References 31 publications

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

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

Spatial Effect Analysis of a Long Strip Pit Partition Wall and Its Influence on Adjacent Pile Foundations

Effect of Particle Size and Constraint Conditions on Single Particle Strength of Carbonate Sand

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