Analysis of the Deformation Law of Deep and Large Foundation Pits in Soft Soil Areas

Yang, Tao; Liu, Shuailei; Wang, Xueyan; Zhao, Hongduo; Liu, Yang; Li, Yanwei

doi:10.3389/feart.2022.828354

Cited by 14 publications

(10 citation statements)

References 34 publications

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“…Therefore, it can be concluded that the model used in this study is reliable and the parameters and simulation process can accurately describe the displacement of the soil behind the wall after excavation. Moreover, there is a certain range of uplift in the soil behind the wall in the secondary influence area, which is consistent with the findings of Tao et al [40].…”

Section: Validation Of the Numerical Modelsupporting

confidence: 92%

Numerical Analysis of the Influence of Deep Excavation on Nearby Pile Foundation Building

Wang,

Yang,

Guo

et al. 2023

Buildings

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In this paper, a numerical simulation is used to establish a three-dimensional model, which considers the height of buildings, the relative position between buildings, and foundation pits. These were studied in detail to investigate the changes in settlement of adjacent buildings and the displacement and internal force of piles caused by deep foundation pit excavation. The results indicate that the number of floors in the building, along with the angle and distance between the building and the excavation pit, have a significant impact on the settlement of the building and the deformation and internal force variation in the piles. For example, when D = 0.1 H, with the increase in the number of floors, the increase in the bending moment of pile 1 at the pile shaft is 62.63 kN·m, and the increase in the bending moment at the pile head is 224.72 kN·m. At this point, the maximum horizontal displacement of the pile shaft occurs at approximately 1.27 H. When θ = 45∘, the maximum difference between the maximum and minimum deformations of the building is 9.71 mm. When D ≤ 1.0 H, the majority of the building is in the primary influence range of surface settlement behind the wall, and the building undergoes a combined deformation of ‘upper convex’ and ‘concave’. When D > 1.0 H, the building predominantly resides in the secondary influence range, and the building undergoes a deformation of ‘upper convex’.

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Section: Validation Of the Numerical Modelsupporting

confidence: 92%

Numerical Analysis of the Influence of Deep Excavation on Nearby Pile Foundation Building

Wang,

Yang,

Guo

et al. 2023

Buildings

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“…All these exceed the average of the overall risk and prevention, and control should be the main focus. In the work decomposition structure, the scores of muck transportation and pipe jacking mud, soil silo construction pressure, lining assembly, cave entrance construction and soil 8 Geofluids reinforcement, and soil reinforcement at the entrance ranked top 5 that can be identified as the work process that is worth attending to, in the mechanical connecting aisle construction process [30].…”

Section: Risk Analysismentioning

confidence: 99%

Risk Assessment Study on Mechanical Connecting Aisle Construction in the Bohai Mudstone Stratum with High Water Pressure

Zhang

Luo

et al. 2022

Geofluids

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With the in-depth advancement of underground transportation in China, the connecting aisle is used as a link between different underground spaces to provide sufficient security and connection. The basic structural units of underground and aboveground spaces play an extremely important role. The use of the mechanical connecting aisle construction of over mucky strata is difficult, and it is easy to have an impact on the main tunnel. To ensure the safety of connecting aisle construction, studies should be performed on the construction technology, equipment, scheme, and related risk analysis of mechanical connecting aisle construction. In this study the work breakdown structure-risk breakdown structure combined with the expert investigation method is used to comprehensively identify the construction process, construct the risk index system of mechanical connecting aisle construction, determine the initial risk value, and comprehensively use the fuzzy-analytic hierarchical process to establish a fuzzy complementary judgment matrix, obtain the risk-weighted correction value, and quantitatively evaluate the risk source level of the mechanical connecting aisle construction. Based on the assessment method, the risk assessment of the mechanical connecting aisle construction project in Daqing section of Qingdao Metro Line 8 was performed, 113 potential risk sources were identified, and the comprehensive assessment obtained 7 major risk sources such as “improperly designed construction organization,” “instability of excavation surface,” and “easy leakage of lower river crossing” that were greater than the total risk average of 2.053. Corresponding risk response measures were proposed, which provided a reference for the risk assessment of similar projects in the construction of similar projects on mechanical connecting aisle construction in the Bohai mudstone stratum with high water pressure.

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“…Subway station construction in urban areas may also involve dealing with geological conditions such as hard rock strata. For foundation pits with hard surrounding rocks, conventional in-time supporting schemes and sequences for deep foundation pits with soft surrounding rocks are effective enough to control the corresponding displacements during excavation process but may lead to over-support of the foundation pits considering that the surrounding hard rocks have certain strengths and thus the displacement of the surrounding rocks is relatively lower than that of soft surrounding rocks [20,21]. As a result, conventional in-time supports for foundation pits with hard surrounding rocks could lead to unnecessary costs, increased manpower, and longer construction durations.…”

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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Analysis of the Deformation Law of Deep and Large Foundation Pits in Soft Soil Areas

Cited by 14 publications

References 34 publications

Numerical Analysis of the Influence of Deep Excavation on Nearby Pile Foundation Building

Numerical Analysis of the Influence of Deep Excavation on Nearby Pile Foundation Building

Risk Assessment Study on Mechanical Connecting Aisle Construction in the Bohai Mudstone Stratum with High Water Pressure

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

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