Floor Heave Mechanism and Anti-Slide Piles Control Technology in Deep and Large-Span Chamber
Abstract
:1. Introduction
2. Discussion on the Floor Heave Mechanism in Deep Chambers
2.1. Plastic Flow Characteristics of the Floor in Deep Chambers
2.2. Ultimate Bearing Capacity of the Floor in Deep and Large-Span Chambers
3. Model Test Based on Digital Speckle Correlation Method
3.1. Digital Speckle Correlation Method
3.2. Test Scheme
3.3. Analysis of Test Results
3.3.1. Analysis of Plastic Zone Range and Distribution Law
3.3.2. Analysis of Displacement Evolution Law
- At the initial stage of loading, the displacement of each section is approximately a straight line and the value of each point is negative, which indicates that the overall vertical compression deformation occurs when the load is small, which is elastic and recoverable;
- With the increase in load, the deformation of each section appears as a zoning phenomenon, that is, in the intervals of (0,750) and (1750,2500) in the X direction, the deformation continues to develop along the Y-axis in a negative direction, and the greater the load, the greater the deformation; whereas in interval (750,1750), the deformation continues to develop along the Y-axis in the positive direction, and the greater the load, the greater the deformation;
- The deformation of the midpoint in interval (750,1750) is the largest, whereas the deformation on both sides of the midpoint is relatively small, which is consistent with the Hill-like deformation mode of central uplift.
4. Anti-Slide Pile Control Technology and Supporting Parameter Determination
4.1. Length Determination of Anti-Slide Pile
4.2. Formatting of Mathematical Components
4.3. Bearing Capacity of Anti-Slide Pile
5. Engineering Application of Anti-Slide Pile to Controlling Floor Heave
5.1. General Engineering Situation
5.2. Support Scheme of Chamber Floor
5.3. Length Calculation of Anti-Slide Pile
5.4. Stability Check of Floor
5.5. Support Effect
6. Conclusions
- (1)
- Under the action of the compression mold effect, the local shear failure first appears below the loading area and develops to the middle part gradually; when the load increases to a certain extent, the local shear failure develops to form a continuous sliding surface and continuous plastic flow deformation occurs.
- (2)
- The essential mechanism of the anti-slide pile controlling of floor heave is that the floor enters into plastic flow in the form of shear slip under stress from vertical load. Laying anti-slide piles perpendicular to the slip surface through the floor can resist shear deformation and realize the goal of stability.
- (3)
- For anti-slide piles, controlling floor heave was proposed according to plastic limit theory; the limit analysis of slip line theory provided a theoretical basis for the design and parameter determination of the anti-slide pile.
- (4)
- An example showed the scheme combining anti-slide piles with anchors has strong supporting capacity to control floor heave in deep chambers, which can meet the needs of using the floor under the limit equilibrium state. The combination is beneficial to ensuring the uniform stress of the floor in large-span chambers and maintaining the floor in good condition.
- (5)
- Practice proved that controlling floor heave by anti-slide piles provides the advantages of a simple process, fast construction, low cost, and significant effects, which have values for their popularization and application in similar conditions.
7. Patents
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Specification Name | Rail Type | Weight | Sectional Area | Steel Material | Tensile Strength |
---|---|---|---|---|---|
parameters | GB22 | 22.3 kg·m−1 | 28.39 cm2 | 55 Q | 780 MPa |
Specification Name | Row × Line Space | Inside (Outside) Diameter | Tensile Strength | Supporting Force |
---|---|---|---|---|
parameters | 1000 mm × 1000 mm | 16 (32) mm | 280 kN | 0.28 MPa |
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Shi, J.; Kong, D. Floor Heave Mechanism and Anti-Slide Piles Control Technology in Deep and Large-Span Chamber. Appl. Sci. 2021, 11, 4576. https://doi.org/10.3390/app11104576
Shi J, Kong D. Floor Heave Mechanism and Anti-Slide Piles Control Technology in Deep and Large-Span Chamber. Applied Sciences. 2021; 11(10):4576. https://doi.org/10.3390/app11104576
Chicago/Turabian StyleShi, Jian, and Desen Kong. 2021. "Floor Heave Mechanism and Anti-Slide Piles Control Technology in Deep and Large-Span Chamber" Applied Sciences 11, no. 10: 4576. https://doi.org/10.3390/app11104576
APA StyleShi, J., & Kong, D. (2021). Floor Heave Mechanism and Anti-Slide Piles Control Technology in Deep and Large-Span Chamber. Applied Sciences, 11(10), 4576. https://doi.org/10.3390/app11104576