Verification of 3D Numerical Modeling Approach for Longwall Mines with a Case Study Mine from the Northern Appalachian Coal Fields

2020 ◽  
Author(s):  
Deniz Tuncay ◽  
Ihsan Berk Tulu ◽  
Ted Klemetti
Keyword(s):  
Numerical Modeling ◽  
3D Numerical Modeling ◽  
Modeling Approach ◽  
Coal Fields

scholarly journals Investigation of spillway rating curve via theoretical formula, laboratory experiment, and 3D numerical modeling: A case study of the Riam Kiwa Dam, Indonesia

2021 ◽  
Vol 930 (1) ◽  
pp. 012030
Author(s):  
J Zulfan ◽  
B M Ginting
Keyword(s):  
Numerical Modeling ◽  
Laboratory Experiment ◽  
Water Depth ◽  
Laboratory Model ◽  
Theoretical Formula ◽  
Rating Curve ◽  
3D Numerical Modeling ◽  
Construction Costs ◽  
3D Software

Abstract The spillway rating curve of the Riam Kiwa Dam was investigated via theoretical formula, laboratory experiment, and 3D numerical modeling. It is an ogee type with two uncontrolled and five gated spillways with a total length of 77.5 m. The experiment was performed with a scale of 1:50, while the numerical modeling was conducted using FLOW-3D software. Several discharge values (16.67–2,652.7 m3/s) were tested and observed for two different scenarios of gate openings. For the low discharge in Scenario 1, the theoretical formula and FLOW-3D computed the rating curve less accurately with the error values greater than 10%. A similar phenomenon was observed in Scenario 2, where both theoretical formula and FLOW-3D predicted the rating curve accurately with error values less than 10% for the higher discharge. The discharges tend to be overestimated for the water depth values greater than 2 m giving the average discharge deviation of 6% for the PMF condition. FLOW-3D was found to calculate water depth for all scenarios accurately. It shows a promising approach between numerical simulation and physical modeling, to minimize laboratory model construction costs.

3D Numerical Modeling of Stratified Flows: Case Study of the Bosphorus Strait

2012 ◽  
Vol 138 (5) ◽  
pp. 406-419 ◽  
Author(s):  
Mehmet Öztürk ◽  
Berna Ayat ◽  
Burak Aydoğan ◽  
Yalçın Yüksel
Keyword(s):  
Numerical Modeling ◽  
Stratified Flows ◽  
3D Numerical Modeling ◽  
Bosphorus Strait

scholarly journals Numerical Analysis of the Width Design of a Protective Pillar in High-Stress Roadway: A Case Study

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
FuZhou Qi ◽  
ZhanGuo Ma ◽  
Ning Li ◽  
Bin Li ◽  
Zhiliu Wang ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Energy Density ◽  
Large Deformation ◽  
High Stress ◽  
Vertical Stress ◽  
Pillar Width ◽  
Modeling Approach ◽  
Roadway Stability ◽  
The Stability

The width design of protective pillars is an important factor affecting the stability of high-stress roadways. In this study, a novel numerical modeling approach was developed to investigate the relationship between protective pillar width and roadway stability. With the 20 m protective pillar width adopted in the field test, large deformation of roadways and serious damage to surrounding rocks occurred. According to the case study at the Wangzhuang coal mine in China, the stress changes and energy density distribution characteristics in protective pillars with various widths were analysed by numerical simulation. The modeling results indicate that, with a 20 m wide protective pillar, the peak vertical stress and energy density in the pillar are 18.5 MPa and 563.7 kJ/m3, respectively. The phenomena of stress concentration and energy accumulation were clearly observed in the simulation results, and the roadway is in a state of high stress. Under the condition of a 10 m wide protective pillar, the peak vertical stress and energy density are shifted from the pillar to roadway virgin coal region, with peak values of 9.5 MPa and 208.3 kJ/m3, respectively. The decrease in vertical stress and energy density improves the stability of the protective pillar, resulting in the roadway being in a state of low stress. Field monitoring suggested that the proposed 10 m protective pillar width can effectively control the large deformation of the surrounding rock and reduce coal bump risk. The novel numerical modeling approach and design principle of protective pillars presented in this paper can provide useful references for application in similar coal mines.

scholarly journals 3D numerical modeling for construction of tunnels intersections- case study of Hakim tunnel

2016 ◽  
Vol 2 (43) ◽  
pp. 1523-1527 ◽  
Author(s):  
Aliakbar Golshani ◽  
Mehdi Joneidi ◽  
Sina Majidian
Keyword(s):  
Numerical Modeling ◽  
3D Numerical Modeling
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