Coal mine water hazards are one of the five major natural disasters in mines, and depleted areas is most serious form hazard causing casualties. The exploration areas, especially old tunnels, presents significant challenges, achieving required borehole density for difficult reality. authors this paper previously applied a patent titled “Water Injection Exploration Method Depleted Areas Based on Stress Seepage Principle”. In order to theoretically analyze feasibility patented results validate...

The deformation behavior of the roof and floor strata during coal seam mining plays a critical role in development mining–induced fractures is an intrinsic factor prevention control rock dynamic disasters, such as mine water hazards. This study investigates values failure angle displacement based on performance through both laboratory field experiments. A method for assessing condition using differences proposed. results indicated that when angular was greater than value, layer destroyed,...

CO2 mineralization is a long-term and secure solution for geological storage that primarily depends on the CO2–brine–rock interaction during sequestration in subsurface formations. In this study, lab experiments were conducted to investigate over short timescales, numerical simulations performed reveal dynamic interactions equilibrium by applying TOUGHREACT PHREEQC, respectively. experiments, main ions of HCO3− Ca2+ detected solution, calcite dissolution dawsonite precipitation observed from...

The permeability of sand is an important factor in determining the movement and occurrence liquids gases sand. current work studied influence soil particle size gradation on by testing different samples that consist defined particles certain ratios. results a total 640 sets experiments were analyzed compared with corresponding theoretical calculations. We found can be divided into four groups based size: high-permeability particles, medium-permeability low-permeability non-permeable...

Karst collapse columns, as a potential water passageway for mine inrush, are always considered critical problem the development of deep mining techniques. This study aims to identify mixing process groundwater deriving two different limestone karst-fissure aquifer systems. Based on analysis hydrogeochemical properties, hydraulic connection between objective systems was revealed. In this paper, piper diagram used calculate ratios at sampling points in systems, and PHREEQC Interactive model...

An innovative process step-feed Anaerobic-multiple Anoxic/Oxic-Membrane Bioreactor [An-M(A/O)-MBR] was developed for biological phosphorus and nitrogen removal from synthetic domestic wastewater. This composed of an anaerobic reactor, a multiple phases aerobic anoxic zones (multiple A/O zone) in sequence followed by continuous aerated MBR. Performance the laboratory-scale system investigated at different organic compounds influent. The results showed that, under conditions imposed, although...

At present, it is difficult to accurately forecast the water inrush from coal seam floor. For safety, necessary monitor and predict inrush. Rock angular displacement can be observed easily show whether floor has bent destroyed or not. The elastic-plastic analysis numerical simulation indicate that, 1) when of rock greater than critical value, shall take place; 2) value 2 (1 + μ)/E × τ0 by while values in Buchun mine are 0.0019 radian for shale stone 0.005 fine sandstone, respectively,...

The failure depth of the working face floor caused by mining is a key parameter to predict water inrush from floor. Extensive research has been conducted on zone face. However, in recent years, there have few studies law with super-large height (over 20 m) western area China. In this paper, 24 m Longwanggou Coal Mine was studied. Electrical monitoring and numerical simulation were carried out. measured 15 while average result 11 m. When compared calculation results statistical analysis...

Karst collapsed columns and faults are common structural water-conducting channels in the coal mining process China, posing a serious threat to safety of mines. During mine water hazard prevention control, it was discovered that original karst were not water-conducting. However, due influence combined development faults, some exploration drill holes showed concentrated outflow. A scientific hypothesis proposed fault cutting leads conduction columns. The study comprehensively used methods...

<title>Abstract</title> The deformation behavior of the roof and floor strata during coal seam mining plays a critical role in development mining-induced fractures is an intrinsic factor prevention control rock dynamic disasters, such as mine water hazards. This study investigates values failure angle displacement based on performance through both laboratory field experiments. A method for assessing condition using differences proposed. results indicate that value closely related to...