Influences of Deep Foundation Pit Excavation on the Stability of Adjacent Ancient Buildings
Abstract
:1. Introduction
2. Research Background
2.1. Overview of Foundation Pit
2.2. Overview of Surrounding Building
3. Monitoring and Result Analysis of Foundation Pit Excavation
3.1. Time–History Curves of Horizontal Displacement of Diaphragm Wall
3.2. Time–History Curve of Settlement of Ancient Building
4. Numerical Simulation
4.1. Establishment of Numerical Model
4.2. Comparison between Field Measurement and Numerical Calculation
- (1)
- Diaphragm Wall Deformation
- (2)
- Settlement of Ancient Building
4.3. Influence of Foundation Pit Excavation on Ground Settlement
4.4. Influence of Foundation Pit Excavation on Adjacent Building
- (1)
- Settlement of Building
- (2)
- Shear Strain of Building
4.5. Influence of MJS Pile Parameters on Building Settlement
- (1)
- Influence of MJS Pile Depth
- (2)
- Influence of MJS Pile Position
5. Conclusions
- (1)
- As the excavation depth of the foundation pit increases, the horizontal displacement of the diaphragm wall increases, the settlement difference of the building increases and the building inclines toward the middle of the foundation pit.
- (2)
- The maximum shear strain of the building’s wall is caused by the settlement difference of the building, which mainly occurs on both sides of the doors and windows and on the left and right corners of the wall. During the construction of foundation pits, key monitoring and protection should be carried out in these areas.
- (3)
- Upon using MJS pile reinforcement, the deformation of the diaphragm wall is significantly reduced. The maximum settlement difference and wall deformation of the ancient building is only one third of that when foregoing MJS pile reinforcement, indicating that MJS pile reinforcement played a good protective role for the ancient building in question.
- (4)
- The closer the MJS pile is to the building or the deeper the MJS pile is, the smaller the building’s settlement difference. When the depth of the MJS pile is greater than one times the depth of the foundation pit, its reinforcement effect is not significantly improved. Therefore, the depth of MJS piles in engineering should be the same as the depth of foundation pits.
Funding
Data Availability Statement
Conflicts of Interest
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Process Name | Foundation Pit Support | Excavation Depth | Construction Remarks |
---|---|---|---|
Construction Preparation | — | 0 m | Underground diaphragm wall construction |
Excavation Stage 1 | Set up the first support | 2.5 m | Reinforced concrete support |
Excavation Stage 2 | Set up the second support | 6.5 m | Steel support |
Excavation Stage 3 | Set up the third support | 12 m | Steel support |
Excavation Stage 4 | Pour foundation pit floor | 15 m | —— |
Soil Thickness (m) | Soil Type | Cohesion (kPa) | Friction Angle (º) | Unit Weight (kN/m3) | Poisson’s Ratio | (kPa) | (kPa) | (kPa) |
---|---|---|---|---|---|---|---|---|
0–3 | Miscellaneous Fill | 5.5 | 4.2 | 17 | 0.32 | 5200 | 5200 | 15,600 |
3–6.5 | Muddy Clay | 18.2 | 17.5 | 18.5 | 0.28 | 6000 | 6000 | 18,000 |
6.5–8 | Silty Clay | 8.6 | 12.6 | 18 | 0.35 | 8700 | 8700 | 26,100 |
8–12 | Hard Plastic Silty Clay | 26.1 | 28.6 | 19.5 | 0.28 | 14,500 | 14,500 | 43,500 |
12–23 | Strongly Weathered Argillaceous Siltstone | 20.5 | 3.5 | 23.2 | 0.32 | 23,000 | 23,000 | 69,000 |
Structure Type | Elastic Modulus (MPa) | Unit Weight (kN/m3) | Poisson’s Ratio |
---|---|---|---|
Crown Beam | 25,000 | 25 | 0.2 |
Diaphragm Wall | 25,000 | 25 | 0.2 |
Concrete Support | 25,000 | 25 | 0.2 |
Steel Support | 210,000 | 78 | 0.3 |
MJS Pile | 400 | 18 | 0.32 |
Building Wall | 2000 | 23 | 0.25 |
Building Foundation | 2000 | 23 | 0.25 |
Maximum Shear Strain/% | Damage Degree of Building |
---|---|
0–0.05 | Negligible |
0.05–0.15 | Slight |
0.15–0.3 | Medium |
>0.3 | Serious |
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Zhang, D. Influences of Deep Foundation Pit Excavation on the Stability of Adjacent Ancient Buildings. Buildings 2023, 13, 2004. https://doi.org/10.3390/buildings13082004
Zhang D. Influences of Deep Foundation Pit Excavation on the Stability of Adjacent Ancient Buildings. Buildings. 2023; 13(8):2004. https://doi.org/10.3390/buildings13082004
Chicago/Turabian StyleZhang, Dandan. 2023. "Influences of Deep Foundation Pit Excavation on the Stability of Adjacent Ancient Buildings" Buildings 13, no. 8: 2004. https://doi.org/10.3390/buildings13082004
APA StyleZhang, D. (2023). Influences of Deep Foundation Pit Excavation on the Stability of Adjacent Ancient Buildings. Buildings, 13(8), 2004. https://doi.org/10.3390/buildings13082004