P-Y Curve Correction of Shallow Seabed Formation Containing Hydrate
Abstract
:1. Introduction
2. Materials and Methods
2.1. Hydrate Sample Preparation Device and Triaxial-Seepage Test Platform
2.1.1. Main Functions of the Test Device
2.1.2. Key Points and Methods of Test Design
2.2. Physical Property Evaluation and Preparation Method of Natural Gas Hydrate Samples
2.2.1. Preparation Method of Natural Gas Hydrate Samples
2.2.2. Physical Property Evaluation Methods of Hydrate Samples
2.2.3. Preparation Materials and Methods of Natural Gas Hydrate Samples
2.3. Correction of P-Y Curves in Hydrate-Bearing Formation in Shallow Seabed
2.3.1. Calculation Method of the P-Y Curve in Shallow Submarine Formation
2.3.2. Numerical Simulation of Pile–Soil Interaction
3. Results
3.1. Triaxial Shear Test of Hydrate Sediments with Different Saturations under Different Pore Pressure and Temperature Conditions
3.2. Triaxial Shear Test of Hydrate Sediments with Different Saturations under Different Net Confining Pressure Conditions
3.3. Numerical Simulation
3.3.1. Meshing of the Model
3.3.2. Numerical Simulation Results
3.3.3. Correction of P-Y Curve
4. Discussion
4.1. Test Device and Sample Preparation Method
4.2. Effects of Saturation, Pore Pressure, and Temperature on the Properties of Hydrate Deposits
4.3. Effects of Hydrate Saturation and Net Confining Properties on the Strength of Hydrate Deposits
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Small Cavity | Large Cavity | ||||
---|---|---|---|---|---|
0.04397 | 2491.66 | 0.04483 | 0.17218 | 2485.24 | 0.03437 |
Outer Diameter | Wall Thickness | Elastic Modulus | Poisson’s Ratio | Density |
---|---|---|---|---|
1524 mm | 54 mm | 210 GPa | 0.33 | 7580 kg/m3 |
Environmental Parameters | Value | Unit | ||
---|---|---|---|---|
Water depth | 28 | m | ||
Height above sea level | 15 | m | ||
Wind speed | 46 | m/s | ||
Wave parameters | Morrison Coefficient | Lateral drag coefficient | 0.7 | |
Tangential drag coefficient | 0.0 | |||
Lateral inertia coefficient | ||||
Airy wave definition | Significant wave height | |||
Significant wave period | ||||
Wavelength | ||||
Ocean Current Parameters | Sea surface velocity | 1.73 | m/s | |
Bottom Velocity | 0.95 | m/s | ||
Fluid density | 1021 | kg/m3 |
Saturation | Cohesion | Angle of Internal Friction | Young’s Modulus |
---|---|---|---|
0% | 4.52 kPa | 29.92° | 43 MPa |
15% | 90.40 kPa | 33.39° | 77 MPa |
25% | 273.29 kPa | 35.90° | 94 MPa |
35% | 295.01 kPa | 38.01° | 128 MPa |
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Diao, H.; Fan, H.; Ji, R.; Wu, B.; Ye, Y.; Liu, Y.; Zhou, F.; Yang, Y.; Yan, Z. P-Y Curve Correction of Shallow Seabed Formation Containing Hydrate. Energies 2023, 16, 3274. https://doi.org/10.3390/en16073274
Diao H, Fan H, Ji R, Wu B, Ye Y, Liu Y, Zhou F, Yang Y, Yan Z. P-Y Curve Correction of Shallow Seabed Formation Containing Hydrate. Energies. 2023; 16(7):3274. https://doi.org/10.3390/en16073274
Chicago/Turabian StyleDiao, Haoyu, Honghai Fan, Rongyi Ji, Bangchen Wu, Yuguang Ye, Yuhan Liu, Fei Zhou, Yixiang Yang, and Zhi Yan. 2023. "P-Y Curve Correction of Shallow Seabed Formation Containing Hydrate" Energies 16, no. 7: 3274. https://doi.org/10.3390/en16073274