Grouting mechanism and experimental study of goaf …
The results show that the average slope of the gangue slurry in the gangue accumulation is 6.34%, and the overall flow law of the gangue slurry in the goaf is the first longitudinal expansion and ...
IJERPH | Free Full-Text | Mechanism of Changes in Goaf …
To clarify the hydrogeochemical characteristics of goaf water and the influence mechanism of water–rock interaction and further reveal microbial action on the formation of goaf …
(PDF) Grouting Reinforcement Mechanism and Multimodel …
Abstract and Figures. Grouting reinforcement is one of the most effective methods to enhance the stability of the goaf, and its scheme selection, hole location, and parameter determination ...
Processes | Free Full-Text | Integrated Geophysical Prediction …
This study identifies goaf and water accumulation characteristics by three steps: seismic forward modeling assistant interpretation, goaf seismic-wave-anomaly characteristics …
Sustainability | Free Full-Text | Characteristics and Formation …
With the rapid development of social economy in China, the contradiction between the wide distribution of abandoned goaf and the shortage of land for engineering construction is becoming increasingly prominent. The effective utilization of coal mining subsidence areas has become an effective measure to alleviate the poverty of …
Dynamic triggering mechanism of the Pusa mining-induced …
Therefore, for the part of the slope overlying the goaf, which would experience a large relative displacement, the rock mass was regarded to be composed of discrete rigid …
Study on the Stage Failure Mechanism and Stability Control of
The field study shows that, when the goaf is restored to the original rock stress state, the distance between the goaf and the coal-mining face is 0.12–0.6 times of the coal seam buried depth, and the numerical simulation results are consistent with the field calculation results, so as to improve the reliability of the numerical simulation ...
Study on the air leakage characteristics of a goaf in a
Air leakage from surface mining-induced fissures can easily cause spontaneous combustion of residual coal in the goaf, which threatens the safe production of the underground working face. In order to study the air leakage law of the goaf under the surface air leakage and the prevention and control t …
Fracture Distribution Characteristics in Goaf and Prevention …
Based on the ventilation characteristics of the gob-side entry retaining face, a mathematical model of spontaneous combustion in the gob-side entry retaining face is established. From the overburden caving of the goaf along the goaf retaining roadway, the development characteristics of rock strata and residual coal fissures in the goaf are …
Subsidence Control Design Method and Application to Backfill
The layout of the backfill-strip mining face in the study area is as follows: the working faces of 11501, 11503, and 11505 are filled by solid backfilling method, and the gangue filling rate of the designed goaf is 75%. Then, the working faces of 11502, 11504, and 11506 are mined by caving mining method.
Goaf Gas Control Improvement by Optimizing the Adjacent
This study introduced gas control technology in goaf using adjacent roadway large-diameter (550 mm) boreholes to control gas accumulation in the upper corner of a fully mechanized working face in high-gas coal seams. The gas control process in the upper corner and gas interception in goaf by large-diameter boreholes was analyzed …
Investigation of coupled control of gas accumulation and …
Disasters with gas accumulation and fire coupled together in goafs can easily occur 1–3 because of poor handling of the relationship between fire prevention and gas disasters, which is a prerequisite for preventing goaf disasters. A high caving space in thick coal seams is created by fully mechanized caving mining, resulting in more coal left in …
Influencing Factors for the Instability and Collapse Mode of …
Large-area goafs in a gypsum mine tend to collapse after 10 or more years, but the influencing factors are still unclear, and the effects of multiple factors have not been …
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Study of Tunnel Damage Caused by Underground …
Bayueshan tunnel (BYS) is an important construction crossing over coal mine goaf. The underground mining subsidence has led the tunnel cracked seriously in three years after it was built. In order to evaluate the coal …
Frontiers | Detection of former goaf and analysis of …
Earth Sci., 08 February 2023 Sec. Environmental Informatics and Remote Sensing Volume 11 - 2023 | https://doi/10.3389/feart.2023.1111745 This article is part of the Research …
Analysis on Stability of Edge Roadbed in Large Mined-Out
At present, the research results on the stability and reinforcement range of the subgrade when the high-speed railway traverses the edge of a large goaf are still scarce. Taking Guinan high-speed railway traversing the edge of the mined-out area of the Dapan well as the research object, high-speed rail load transfer depth and height of goaf …
Numerical investigation on mechanism and fluid flow behavior of goaf
Goaf water inrush has become one of the most prominent issues threatening the safety production of coal mines. To better understand how this hazard develops, a mechanical model and a nonlinear flow model were used to study an inrush that occurred in Dongyu mine. Based on the dominant hydraulic characteristics of groundwater in the …
Study on Hydraulic Connection and Seepage Law of Goaf Groups
A coal mine underground reservoir, composed of a large number of goaf groups, is effective in achieving the protective utilization of coal mine water. Mastering the hydraulic connection between the goaf groups and the law of seepage is the key to the design and safe operation of coal mine underground reservoirs. Coal/rock sample …
Frontiers | Research on monitoring and stability evaluation of …
The geological disasters caused by the ground deformation of the goaf have brought huge security risks to the ecological environment and society. Therefore, it is imminent to realize the effective monitoring and stability analysis of the ground deformation of the goaf. In this paper, taking the goaf of the gypsum mine in Diaodao District, …
Seismic Response Analysis of Deep Underground Roadways and
The goaf was established using a different bulk model from the past, which was more in line with the actual situation of coal mining. Under the FEM and the DEM, the seismic response analysis was performed on coal pillars and roadways under different coal pillar widths and four seismic waves. This numerical method can be used to determine …
A Large Goaf Group Treatment by means of Mine Backfill …
This paper evaluates comprehensively the stability of the multistage large-scale goaf group in a Pb-Zn mine in Inner Mongolia, China, via the modified Mathews stability diagram …
Optimum Selection of Mining Plans for Pillars Containing
A reasonable selection of the pillar mining plan is the key to ensure smooth mining in the goaf group, which plays an important part in safe production. In formulating and optimizing the pillar mining plan, the influence of the ground pressure evolution law should be fully considered. This paper first introduces two mining plans for pillars, and …
Frontiers | Numerical simulation study on the influence of air …
The range of the oxidation heating zone of the goaf is 98 m-245 m on the air inlet side and 33 m-96 m on the air return side. The numerical simulation result is well consistent with and the field test data. The research conclusion can guide the fire preventing and extinguishing of No. 122108 working face, and lay a foundation for the prevention ...
Frontiers | Heterogeneous rock mass detection in the Goaf …
The existence of heterogeneous rock mass in the goaf easily causes surface deformation, subsidence, and even collapse, which restricts the development of urbanization of the buildings above the goaf. Because of the saturation of the city and the shortage of power supply, the idea of building the Yingbin substation was proposed on the old coal …
Grouting mechanism and experimental study of …
2.1 Gangue slurry filling technology in goaf. Gangue slurry pipeline filling technology refers to the coal-based solid waste produced in the production process of coal mines or power plants made into powder …
Numerical Study of Stability and Connectivity of Vertical …
The paper presented a case study of goaf hole failure at a longwall coal mine in Australia. The paper demonstrated the use of advanced numerical methods to understand the goaf …