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Article
Open AccessNumerical research on disastrous mechanism of seepage instability of karst collapse column considering variable mass effect
In order to reveal the disastrous mechanism of seepage instability of karst collapse column considering variable mass effect, a variable mass fluid–solid coupling mechanical model of water inrush is establishe...
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Article
Open AccessBreaking law of overburden rock and key mining technology for narrow coal pillar working face in isolated island
When conducting retreat mining in segmented coal pillars, the dynamic evolution of stress and overlying strata structure is more complex than conventional working faces due to the influence of adjacent working...
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Article
Open AccessResearch on overburden structural characteristics and support adaptability in cooperative mining of sectional coal pillar and bottom coal seam
In the mining process of the II1 coal seam at Zhaogu No. 2 coal mine, a method of stratified mining is employed, leaving relatively wide coal pillars in sections. To enhance the resource recovery rate, the min...
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Article
Open AccessNonlinear evolution characteristics and seepage mechanical model of fluids in broken rock mass based on the bifurcation theory
With the deep extension of coal mining in China, fault water inrush has become one of the major disasters threatening the safety production of coal mine. Based on the control equations of steady state and non-...
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Article
Open AccessFracture propagation and pore pressure evolution characteristics induced by hydraulic and pneumatic fracturing of coal
A two-dimensional unsteady seepage model for coal using a finite element program is developed, and the temporal variations of key factors such as water pressure and hydraulic gradient are analyzed in this pape...
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Article
Open AccessExperimental research on mechanical performance of grouting plugging material with large amount of fly ash
In order to achieve the purpose of long-term stable mining of roadway, the strength and stability of rock mass are improved by means of grouting of fractured rock mass. In this paper, orthogonal test and numer...
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Article
Open AccessSeepage evolution characteristics and water inrush mechanism in collapse column under mining influence
To obtain the seepage evolution rule and water inrush mechanism of the collapse column, a multi-field coupled mechanical model for water inrush disasters caused by the collapse column is established in this pa...
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Article
Open AccessEvolution mechanism of water-conducting fractures in overburden under the influence of water-rich fault in underground coal mining
Based on the 7618 working face in Yaoqiao coal mine of Datun mining area, the activation mechanism of water-rich faults and the development characteristics of water-conducting fractures in overlying strata und...
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Article
Open AccessMigration mechanism of grouting slurry and permeability reduction in mining fractured rock mass
In order to solve the water and gas discharge hazard caused by gob water and harmful gases (such as CO), the method of grouting overburden fractures is adopted to achieve the purpose of safe and efficient mini...
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Article
Open AccessAbnormal ore pressure mechanism of working face under the influence of overlying concentrated coal pillar
Shenfu Dongsheng coal field is a cross-century energy base which is developed and constructed in China. In recent years, some mines have successively entered to the coal seam of the second layer. Due to the re...
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Article
Open AccessResearch on slurry diffusion and seepage law in mining overburden fractures based on CFD numerical method
It is of great theoretical significance and engineering application value to research the diffusion law of slurry in mining fractures of rock strata to enrich grouting theory and improve grouting sealing effec...
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Article
Deformation and failure characteristics of composite coal mass
This study analyzed stress characteristics and mechanical properties and compared the similarities and differences of composite coal mass with soft and hard coal mass in deformation and failure characteristics...
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Article
AmpC Promoter and Attenuator Mutations Affect Function of Three Escherichia coli Strains
To investigate the correlation between mutations in promoter, attenuator, and the AmpC enzyme overproduction in Escherichia coli. ampC Promoters from 4 Escherichia coli clinical isolates were cloned upstream to t...
