Application and Automatic Monitoring and Analysis of Hybrid Support Structure in Ultra-DEEP Foundation Pit Engineering in the Lanzhou Area under Complex Environmental Conditions

Wu, Jihuai; Ye, Shuaihua; Wang, Zhiquan; Yang, Dong

doi:10.3390/w15071335

Cited by 11 publications

(8 citation statements)

References 13 publications

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“…Plain concrete piles emerge as a pivotal method for foundation treatment, owing to their cost-effectiveness and versatility [4]. Nevertheless, practical engineering implementation of this method encounters challenges [5], including intricate geological conditions, excavation effects, economic feasibility, and construction complexities.…”

Section: Introductionmentioning

confidence: 99%

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Li,

Yi,

et al. 2024

Buildings

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The intricacies of foundation pit engineering often result in alterations to the surrounding environment, posing potential threats to the safe operation of nearby buildings and pile foundations. This study employs finite element numerical simulation to scrutinize the influence of vacuum preloading pressure, preloading duration, excavation slope ratio, excavation duration, and retaining pile wall depth on the stress and deformation of existing plain concrete pile foundations. The findings reveal that the impacts of excavation are primarily absorbed by both proximal and distal piles in relation to the pit. Moreover, elevating vacuum preloading pressure and extending the preloading duration during dewatering can lead to increased internal forces and displacement of the piles. Changes in excavation slope ratio exhibit minimal effects, while prolonged excavation duration can shift internal forces from predominantly positive to negative, with negligible impact on horizontal displacement. Importantly, augmenting the depth of the retaining pile wall embedding effectively mitigates the effects of pit excavation.

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Section: Introductionmentioning

confidence: 99%

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Li,

Yi,

et al. 2024

Buildings

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“…During the past few decades, investigations at home and abroad have always concentrated on safety evaluations for deep foundation pits with soft surrounding rocks [12,13]. Wu et al [14] adopted a support scheme consisting of bored piles and prestressed anchor cable supports combined with concrete corner bracings to ensure the safety of an ultradeep foundation pit in soft soils influenced by groundwater. Niu et al [15] adopted a combined support system consisting of prestressed composite pile-anchors and miniature steel pipe piles to guarantee the safety and stability of a deep foundation pit in fill soil areas.…”

Section: Introductionmentioning

confidence: 99%

Stability of a Deep Foundation Pit with Hard Surrounding Rocks under Different in-Time Transverse Supporting Conditions

Li,

Ma,

Gao

et al. 2024

Applied Sciences

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This paper focuses on investigating the stability of a deep foundation pit with hard surrounding rocks at different excavation stages with different supporting schemes by means of numerical calculations. The supporting schemes in question were combinations of one fixed vertical support and four varied transverse supports. Drilled grouting piles were used as vertical supports, and the commonly used steel bracings and prestressed anchorages served as transverse supports. The parameters used to evaluate the stability of the foundation pit at different excavation stages included the lateral displacements of the surrounding rocks, the settlement of the surrounding ground, the axial forces of steel bracings, and displacements at the tops of the drilled grouting piles. Simulation results showed that when a transverse supporting scheme consisting of one-layer steel bracings and prestressed anchorages set at 9 m and 22.5 m underground, respectively, was adopted, the lateral displacements of the surrounding rocks and settlement of the surrounding ground at different excavation stages were the largest compared to those under the other three transverse supporting schemes, while the corresponding values were lower compared to those allowed in Chinese standard GB50007-2011, demonstrating that this kind of supporting scheme is effective in terms of ensuring the safety of the foundation pit at different excavation stages. Moreover, the setting techniques for this kind of supporting scheme were relatively simple, and the corresponding influences of supporting element arrangements on excavation techniques were the lowest. Therefore, one-layer steel bracings and one-layer prestressed anchorages constituted the most suitable transverse supporting scheme for excavating a deep foundation pit with hard surrounding rocks.

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“…In general, more extended construction periods and larger pit sizes result in a more significant deformation of the pit and surrounding structures. Several researchers [9][10][11][12][13][14][15][16][17] have investigated the stress and deformation of support structures during the excavation of foundation pits. However, these studies mainly focused on small-to medium-sized foundation pits and were conducted for foundation pits with better soil conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on Excavation Response of Deep Foundation Pit Supported by SMW Piles Combined with Internal Support in Soft Soil Area

Tu,

Zheng,

et al. 2023

Water

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Based on a foundation pit project in Fuzhou, China, the influence of foundation pit excavation on the supporting structure and surrounding environment in a soft-soil area is studied. This study was based on actual monitoring data and investigated the variations in the supporting structure, surrounding constructions, and groundwater levels during excavation. The analysis of the monitoring data demonstrates the presence of pronounced ‘spatial effects’ and ‘temporal effects’ on the deformation of the support structure and surrounding structures. The deformation of the support structure and surrounding structures exhibits distinct spatial distribution characteristics at different locations along the excavation pit wall. Typically, more significant deformations are observed in the middle section of the pit wall, while deformations decrease as the distance from the pit corner decreases. The support structure’s and surrounding structures’ deformation characteristics vary during different construction stages. During the excavation phase, the rate of deformation increase in the support structure and surrounding structures is notably higher. In contrast, during the construction of the underground basement floor and the backfilling phase of the excavation pit, the rate of deformation increase in the support structure and surrounding structures is relatively lower. Throughout the entire construction period of the excavation pit, the groundwater level in the vicinity of the pit exhibits a fluctuating trend. Apart from the influence of rainfall, the overall variation in groundwater level is minimal, indicating the effective water-sealing performance of the combined Soil-Mixing Wall (SMW) support structure within the circular enclosure.

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Application and Automatic Monitoring and Analysis of Hybrid Support Structure in Ultra-DEEP Foundation Pit Engineering in the Lanzhou Area under Complex Environmental Conditions

Cited by 11 publications

References 13 publications

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Stability of a Deep Foundation Pit with Hard Surrounding Rocks under Different in-Time Transverse Supporting Conditions

Study on Excavation Response of Deep Foundation Pit Supported by SMW Piles Combined with Internal Support in Soft Soil Area

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