A Study of Directional Permeability and Gas Injection to Flush Coal Seam Gas Testing Apparatus and Method

Zhang, Lei; Zhang, Cun; Tu, Shihao; Tu, Hongsheng; Wang, Chen

doi:10.1007/s11242-015-0612-8

Cited by 53 publications

(23 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The gas sources of the FMSC faces are the coal walls of the working faces and the fallen coals in goafs . Furthermore, the gas sources in goafs are the surrounding rock, the residual coal, and the adjacent seams . For the slice mining of thick coal seams, the gas in the unmined layers may flow into the goaf.…”

Section: Effect Of the Roof Weighting On Gas Emission In Working Facesmentioning

confidence: 99%

“…35,36 Furthermore, the gas sources in goafs are the surrounding rock, the residual coal, and the adjacent seams. 37 For the slice mining of thick coal seams, the gas in the unmined layers may flow into the goaf. If there are several goafs in the study area, the gas in the other goafs may flow into the present goaf.…”

Section: Weighting On Gas Emission In Working Facesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Guo

Cui

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

The abnormal emission of gas in coals is the main factor that induces serious gas disasters in coal mines. During the coal mining process, roof movement has important effects on the gas emission law and gas flow characteristics. In this study, an extremely thick coal seam under fully mechanized sublevel caving mining conditions from the Tashan coal mine in China was used as an example; the effect of roof weighting on gas emission in the goaf was studied. Then, the large roof weighting step and the small roof weighting step caused by the different thicknesses of lamprophyre breakage were used as the objects and a numerical simulation study on the gas flow characteristics in the goaf was carried out. The results indicate that the mining coal seams, the overlying adjacent unmined coal seams, and the goaf are the main contributors to the large gas emission capacity, and even situations exist where the gas concentration exceeds the limit in the working face. During roof weighting, the gas concentration and emission capacity in the return airway, upper corner, and high drainage roadway increase substantially. The results of the numerical analysis are in good agreement with the observed data, which indicates that it is effective to control the gas in coal seams by designing the location of high drainage roadway according to the mining characteristics of coal seam and the gas emission law.

show abstract

Section: Effect Of the Roof Weighting On Gas Emission In Working Facesmentioning

confidence: 99%

Section: Weighting On Gas Emission In Working Facesmentioning

confidence: 99%

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Guo

Cui

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…It is noted that the high gas content of the coal seam also has an impact on the excavation of the return airway. Regarding this, the comprehensive gas flow characteristics and the hard-to-drain problem of the coal seam are also investigated [32][33][34], and the gas problem will not be detailed in this paper.…”

Section: Field Measurementsmentioning

confidence: 99%

The Complex Function Method Roadway Section Design of the Soft Coal Seam

et al. 2016

Mathematical Problems in Engineering

Self Cite

View full text Add to dashboard Cite

As for the sophisticated advanced support technique of vertical wall semicircle arch roadway in the three-soft coal seam, a design of flat top U-shape roadway section was put forward. Based on the complex function method, the surrounding rock displacement and stress distribution laws both of vertical wall semicircle arch roadway and of flat top U-shape roadway were obtained. The results showed that the displacement distribution laws in the edge of roadway surrounding rock were similar between the two different roadways and the area of plasticity proportion of flat top U-shape roadway approximately equals that of vertical wall semicircle arch roadway. Based on finite element method, the bearing behaviors of the U-type steel support under the interaction of surrounding rock in vertical wall semicircle arch roadway and flat top U-shape roadway were analyzed. The results showed that, from a mechanics perspective, U-type steel support can fulfill the requirement of surrounding rock supporting in flat top U-shape roadway and vertical wall semicircle arch roadway. The field measurement of mining roadway surrounding rock displacement in Zouzhuang coal mine working face 3204 verified the accuracy of theoretical analysis and numerical simulation.

show abstract

“…Coalbed methane (CBM) is a companion to coal, which occurs differently from oil and natural gas, and is absorbed mainly in the coal structure . On the one hand, CBM is the primary cause of disasters in coal mines, and its presence can lead to disasters such as gas outbursts and explosions .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the seepage characteristics of bituminous coal under the conditions of liquid nitrogen fracturing

Chen

Zhang

et al. 2019

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

In coalbed methane (CBM) exploitation, liquid nitrogen (LN2) fracturing has attracted much attention as a promising and effective means to enhance coal seam permeability. Considering the bituminous coal in the Xutuan coal mine of Anhui Province, China, the permeability characteristics of coal samples under different pressure and stress conditions, and a single LN2 treatment and cyclic fracturing conditions were studied. Additionally, an evaluation of the macroscopic cracking behavior of coal was carried out. LN2 treatment can be very effective in promoting the generation of macroscopic fissures in the coal, and the degree of damage increases with the number of fracturing cycles. The results of a single LN2 treatment showed that under a constant confining pressure, the permeability increased exponentially with the increase in gas pressure. The cyclic LN2 treatment showed that permeability first decreased and then increased with increasing gas pressure, which is consistent with the quadratic function distribution. The permeability of the coal sample increases exponentially with the number of cycles, but the growth rate gradually slows down. For the same absolute fracturing time, cyclic fracturing had a better fracturing effect than a single cycle, and the ratio of the permeability increment is 126.3%‐213.8%. The research results provide some guidance for the development of the LN2 freeze fracturing technology.

show abstract

A Study of Directional Permeability and Gas Injection to Flush Coal Seam Gas Testing Apparatus and Method

Cited by 53 publications

References 43 publications

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

The Complex Function Method Roadway Section Design of the Soft Coal Seam

Experimental study on the seepage characteristics of bituminous coal under the conditions of liquid nitrogen fracturing

Contact Info

Product

Resources

About