Physical and Numerical Modeling of the Stability of Deep Caverns in Tahe Oil Field in China
Abstract
:1. Introduction
2. Test
2.1. Test Equipment
2.2. Test Material
2.3. Test Procedures
3. Result of the Model Test
3.1. Cave Collapse and Failure Process
3.2. Change Rules of Displacement and Stress around the Cavern
4. Numerical Analysis and Verification
4.1. Numeric Calculation Model
4.2. Analysis of Calculation Results
5. Conclusions
- The ultra-high pressure test equipment is developed, which can be used to carry out experimental research to study the collapse of the cave with a depth of more than 5000 m.
- Based on the theory of similarity, the model similar material which meets the similitude conditions with the prototype rock is developed in terms of the deformation characteristics as well as the strength failure characteristics. The mass ratio of iron powder, barite powder and quartz sand is 1:0.67:0.25. The concentration of rosin alcohol solution is 17%. The weight of rosin alcohol solution is 6% of the similar material total weight.
- The failure mechanism of the cave is determined through the model test and numerical calculations: the collapse process starts from the cracks emerging on left and right walls; then, the cracks run through the top, eventually causing the final collapse and failure. Shear failure is the primary failure mode, and the damage scope is 2.3 times as long as the cave span.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Bulk Density (KN/m3) | Poisson Ratio | Elasticity Modulus (MPa) | Compressive Strength (MPa) | Friction Angle (°) | Cohesive Stress (MPa) |
---|---|---|---|---|---|
27 | 0.25 | 36,300 | 74.2 | 36.05 | 2 |
Bulk Density (KN/m3) | Poisson Ratio | Elasticity Modulus (MPa) | Compressive Strength (MPa) | Friction Angle (°) | Cohesive Stress (MPa) |
---|---|---|---|---|---|
26.8–27.1 | 0.23–26 | 710–820 | 1.38–1.61 | 35.4–36.5 | 0.23–0.26 |
I:B:S 1 | Rosin-Medical Alcohol Solution Concentration (%) | Percentage of the Rosin-Medical Alcohol Solution (%) |
---|---|---|
1:0.67:0.25 | 17 | 6 |
Measure point on the top | Distance to the top (mm) | 10 | 100 | 190 | 280 | 370 | 460 |
Top replacement (mm) | 5.69 | 5.6 | 5.5 | 5.62 | 5.65 | 5.29 | |
Measure point on the left wall | Distance to the left wall (mm) | 10 | 100 | 190 | 280 | 370 | 460 |
left wall replacement (mm) | 3.8 | 1.2 | 0.9 | 0.2 | 0 | 0 | |
Measure point on the right wall | Distance to the right wall (mm) | 10 | 100 | 190 | 280 | 370 | 460 |
right wall replacement (mm) | 2.9 | 1.5 | 1.3 | 0.1 | 0 | 0 |
Measure point on the top | Distance to the top (mm) | 10 | 100 | 190 | 280 | 370 | 460 |
Top stress (MPa) | 0.2 | 0.8 | 1.2 | 1.8 | 2.6 | 2.4 | |
Measure point on the left wall | Distance to the left wall (mm) | 10 | 100 | 190 | 280 | 370 | 460 |
left wall stress (MPa) | 0.16 | 0.5 | 0.8 | 1.31 | 1.5 | 1.6 | |
Measure point on the right wall | Distance to the right wall (mm) | 10 | 100 | 190 | 280 | 370 | 460 |
right wall stress (MPa) | 0.1 | 0.4 | 0.7 | 1.26 | 1.6 | 1.68 |
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Wang, C.; Zhang, Q.; Xiang, W. Physical and Numerical Modeling of the Stability of Deep Caverns in Tahe Oil Field in China. Energies 2017, 10, 769. https://doi.org/10.3390/en10060769
Wang C, Zhang Q, Xiang W. Physical and Numerical Modeling of the Stability of Deep Caverns in Tahe Oil Field in China. Energies. 2017; 10(6):769. https://doi.org/10.3390/en10060769
Chicago/Turabian StyleWang, Chao, Qiangyong Zhang, and Wen Xiang. 2017. "Physical and Numerical Modeling of the Stability of Deep Caverns in Tahe Oil Field in China" Energies 10, no. 6: 769. https://doi.org/10.3390/en10060769