Face Advance Ensuring Economic Viability for Thin Seam Mining

2007 ◽  
pp. 75-80
Author(s):  
Jerzy Kicki ◽  
Piotr Sa_uga
Keyword(s):  
Economic Viability ◽  
Face Advance ◽  
Thin Seam ◽  
Seam Mining

scholarly journals Gob-Side Entry Retaining Involving Bag Filling Material for Support Wall Construction

2020 ◽  
Vol 12 (16) ◽  
pp. 6353
Author(s):  
Zhaowen Du ◽  
Shaojie Chen ◽  
Junbiao Ma ◽  
Zhongping Guo ◽  
Dawei Yin
Keyword(s):  
Field Tests ◽  
Filling Material ◽  
Construction Technology ◽  
Working Face ◽  
Support Resistance ◽  
Pillar Mining ◽  
High Production ◽  
Wall Construction ◽  
Thin Seam ◽  
Seam Mining

Gob-side entry retaining, also termed as non-pillar mining, plays an important role in saving coal resources, high production and efficiency, extending the service life of mine and improving the investment benefit. Herein, a gob-side entry retaining method involving the use of bag filling material for wall construction is proposed based on the thin seam mining characteristics. First, a gob-side entry retaining mechanical model is established, and the side support resistance of the 8101 working face is calculated. The mechanical properties of the bag material are investigated through experiments, and the construction technology of the gob-side entry retaining approach involving the use of bag filling material for wall construction is introduced. The deformation on the two sides, the roof and floor of the roadway, are simulated via numerical methods and monitored during field tests. The results show a small control range for the deformations and a good roadway retention effect, thereby proving the feasibility of the bag filling material for wall construction. This study provides a reference for the development of gob-side entry retaining mining for thin coal seams.

An integrated technology for gas control and green mining in deep mines based on ultra-thin seam mining

2017 ◽  
Vol 76 (6) ◽  
Author(s):  
Ting Liu ◽  
Baiquan Lin ◽  
Wei Yang ◽  
Tong Liu ◽  
Cheng Zhai
Keyword(s):  
Integrated Technology ◽  
Gas Control ◽  
Thin Seam ◽  
Seam Mining

scholarly journals Complex Effects of Drum Hub Forms and Structural Parameters on Coal Loading Performance

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Kuidong Gao ◽  
Xiaodi Zhang ◽  
Liqing Sun ◽  
Qingliang Zeng ◽  
Kao Jiang
Keyword(s):  
Velocity Field ◽  
Loading Rate ◽  
Structural Parameters ◽  
Cone Angle ◽  
Dem Simulation ◽  
Coal Particles ◽  
New Form ◽  
Motion Parameters ◽  
Thin Seam ◽  
Seam Mining

The extremely poor loading performance of a thin coal shearer drum affects the mining efficiency in thin seam mining seriously on account of the restriction by the complicated mining environment and seam thickness. The coal loading performance of the drum is influenced by several complex factors, such as motion parameters and structural parameters, including the structure and form of the hub. The form of the drum hub is cylindrical in general, and in order to study the influence of the hub form on the coal loading rate of the drum, seven drums with different hub forms and structures were designed. The influence of the complexity of hub structures on the coal loading performance was studied by discrete element method (DEM) simulation in this paper. The change curves with the research object of different drums, such as coal loading rate, velocity field distribution, and contact force between fallen coal particles, were obtained. The results showed that the conical hub drum can improve the coal loading performance than the cylindrical hub drum, and the curve-shaped hub drum had a more obvious promotion on the coal loading performance. The coal loading rate increased first and then decreased with the increase of hub cone angle. Compared with the conical hub drum, the curve-shaped hub drum can not only improve the coal loading rate, but also has a larger space containing coal. This study has proposed a drum with a new form hub which could increase the coal loading rate, and the methods and conclusions provide the guidance for drum hub design.

scholarly journals Numerical study of the influence of coal seam mining under reservoir on deep oversize fault deformation

2019 ◽  
Vol 23 (4) ◽  
pp. 2315-2322
Author(s):  
Xinxian Zhai ◽  
Yanwei Zhai ◽  
Xingzi Tu ◽  
Rubo Li ◽  
Guangshuai Huang
Keyword(s):  
Coal Seam ◽  
Numerical Study ◽  
Hanging Wall ◽  
Water Inrush ◽  
Coal Pillar ◽  
Simulation Software ◽  
Face Advance ◽  
Pillar Width ◽  
Coal Face ◽  
Seam Mining

Ground surface in Yonglong coal mine is hilly terrain. There is a Yinshigou reservoir on minefield. Deep coal seam mining under the reservoir has an influence on the deformation of oversize normal fault, and can cause severe mine water-inrush. Using numerical simulation software UDEC, the paper studied the characteristics of plastic zone and stress field in front of coal face in the hanging wall of the fault, while the coal face advance distances from setting-up room to coal face line were different. The results showed that while the distance from coal face to the fault i. e. the width of fault-protected pillar, was 80 m, the front abutment pressure had less influence on two sides rock mass of the fault, the fault reduced the vertical stress of its surrounding rocks; The surrounding rocks in the vicinity of fault were in a same vertical displacement contour, whose displacement was very smaller. Reasonable fault-protected pillar width of the numerical study was much closer to the average water-proof coal pillar width based on coal mines water prevention regulations of China. Consequently, while the width of fault-protected pillar is more than 80 m, coal seam mining in hanging wall of fault has no influence on the fault, and coal seam safely mining under the reservoir could be carried out.

scholarly journals Analysis of US underground thin seam mining potential. Volume 1. Text. Final technical report, December 1978. [In thin seams]

1979 ◽  
Author(s):  
R. A Pimental ◽  
D. Barell ◽  
R. J. Fine ◽  
W. J. Douglas
Keyword(s):  
Technical Report ◽  
Thin Seam ◽  
Seam Mining
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