Study on the Analysis of Pile Foundation Deformation and Control Methods during the Excavation of Deep and Thick Sludge Pits
Abstract
:1. Introduction
2. Project Overview
2.1. Introduction to Surrounding Environment and Site Geology
2.1.1. Project Introduction
2.1.2. Composition and Engineering Characteristics of Subsoil and Rock
3. Excavation Support Plan and Construction Plan
Excavation Support Plan
4. Engineering Monitoring Scheme and Monitoring Results Analysis
4.1. Monitoring Point Layout and Monitoring Content
4.2. Performance-Based Security Assessment Protocol
4.2.1. Background and Purpose
4.2.2. Performance Objectives and Indicators
4.2.3. Monitoring Methods and Techniques
4.2.4. Data Acquisition and Analysis
4.2.5. Performance-Based Security Assessment
4.2.6. Continuous Monitoring and Improvement
4.2.7. Conclusions
4.3. Analysis of Monitoring Results
4.3.1. Settlement Analysis of Park on the South Side of Foundation Pit
4.3.2. Analysis of Monitoring Results of Gravity Retaining Wall
4.3.3. Analysis of Deformation Monitoring Results of Pile Foundation in the Foundation Pit
4.3.4. Analysis of Monitoring Results of Axial Force of Steel Support
4.3.5. The Eastern Side of the Excavation Site Is Adjacent to a Road
5. Finite Element Simulation Analysis
5.1. Establishment of Finite Element Model
5.2. Definition of Numerical Simulation Construction Stage
5.3. Analysis of Numerical Simulation Results
5.3.1. Vertical Displacement Analysis of Soil at the Bottom of Foundation Pit
5.3.2. Comparative Analysis of Axial Force of Steel Support and Numerical Simulation
5.3.3. Analysis of Displacement and Bending Moment of Pile Foundation
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Name of Soil | The Natural Unit Weight γ (kN/m3) | Cohesive Strength Ck (kPa) | Internal Friction Angle φk( ) | Compressive Modulus ES1-2 (MPa) | Permeability Coefficient k (cm/s) |
---|---|---|---|---|---|
① Miscellaneous fill soil | 17.5 | 12.0 | 10.0 | 4.5 | 5.0 × 10−3 |
② Silt | 17.9 | 5.0 | 5.0 | 2.0 | 3.0 × 10−5 |
③ Silty clay | 19.2 | 42.0 | 12.2 | 7.0 | 3.0 × 10−6 |
④ Clay | 19.6 | 50.0 | 16.5 | 11.0 | 6.0 × 10−7 |
⑤ Highly weathered sandy claystone | 20.0 | 10.0 | 20.0 | 20.0 | 2.0 × 10−5 |
⑥ Moderately weathered sandy claystone | 22.5 | 30.0 | 40.0 | 500 | 2.0 × 10−6 |
Stage | Construction Area | Construction Duration Days | Construction Content |
---|---|---|---|
Before excavation | North side of foundation pit | - | North building basement |
South side of the foundation pit | - | Gravity retaining wall construction | |
The whole foundation pit area | - | Pile foundation construction | |
Under excavation | East and west sides of the foundation pit | - | Diaphragm wall construction |
East area of foundation pit | 20 | Excavate to 5 m. | |
East area of foundation pit | 30 | Pile cutting-steel support construction | |
East area of foundation pit | 10 | The first steel support construction | |
East area of foundation pit | 25 | Excavation of the first layer of soil | |
East area of foundation pit | 25 | Excavation of the second layer of soil | |
East area of foundation pit | 25 | The second steel support construction | |
East area of foundation pit | 25 | Demolition of steel support | |
South side of foundation pit | 10 | Basement floor construction | |
After excavation | - | - | - |
Structure/Soil Mass | γ (103KN/m3) | E (Mpa) | ( ) | Unit Type | |
---|---|---|---|---|---|
Miscellaneous fill | 18.5 | 20 | 15 | 0.40 | Entity unit |
Clay | 19 | 30 | 20 | 0.35 | Entity unit |
Silt | 18 | 6 | 5 | 0.45 | Entity unit |
Strongly weathered sandstone | 26 | 7.0 × 104 | 45 | 0.31 | Entity unit |
Rock | 28 | 1.8 × 105 | 50 | 0.30 | Entity unit |
Reinforcement soil at pit bottom | 20 | 45 | 36 | 0.32 | Entity unit |
Gravity cement soil wall | 19.5 | 50 × 104 | 40 | 0.30 | Entity unit |
Concrete diaphragm wall | 25 | 4.5 × 104 | - | 0.30 | Entity unit |
Pile foundation/basement floor | 25 | 3.25 × 104 | - | 0.28 | Beam/plate element |
Steel support | 78 | 2.1 × 105 | - | 0.26 | Beam element |
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Wang, D.; Ye, S.; Xin, L. Study on the Analysis of Pile Foundation Deformation and Control Methods during the Excavation of Deep and Thick Sludge Pits. Water 2023, 15, 3121. https://doi.org/10.3390/w15173121
Wang D, Ye S, Xin L. Study on the Analysis of Pile Foundation Deformation and Control Methods during the Excavation of Deep and Thick Sludge Pits. Water. 2023; 15(17):3121. https://doi.org/10.3390/w15173121
Chicago/Turabian StyleWang, Dengqun, Shuaihua Ye, and Liangliang Xin. 2023. "Study on the Analysis of Pile Foundation Deformation and Control Methods during the Excavation of Deep and Thick Sludge Pits" Water 15, no. 17: 3121. https://doi.org/10.3390/w15173121