Numerical Simulation of Breaking Arch Evolution Rule of Coal Seams Mining

Numerical simulation analysis were done on breaking arch developing and evolving process of both single stope and coal seams mining field by FLAC3D. Results show that in single strope's advancing process, breaking arch's height would be different as strope's length changes, and breaking arch's height was decided by strope's length; in composite strope, as the coal pillar increasing, composite strope's breaking arch gradually develops from superposition state to independent state; as the strope's length changing composite strope's superposition state tend to balance

Download Full-text

Modeling the Spatial and Temporal Evolution of Stress during Multiworking Face Mining in Close Distance Coal Seams

Advances in Civil Engineering ◽

10.1155/2021/5624972 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

Yong Zhang ◽

Jinkun Yang ◽

Jiaxuan Zhang ◽

Xiaoming Sun ◽

Chen Chen ◽

...

Keyword(s):

Numerical Simulation ◽

Stress Distribution ◽

Temporal Evolution ◽

Coal Pillar ◽

Coal Seams ◽

Geological Conditions ◽

Coal Pillars ◽

The Stability ◽

Close Distance ◽

Close Distance Coal Seams

Mining in close distance coal seams (CDCSs) is frequently associated with engineering disasters because of the complicated nature of stress distribution within CDCSs. In order to establish a layout of a roadway to minimize the occurrence of disasters associated with mining CDCS, here the spatial and temporal evolution of stress distribution during the multiworking face mining of a CDCS was explored through numerical simulation based on the engineering and geological conditions of the Nantun Coal Mine. The numerical simulation results indicate that, after the extraction of adjacent multiple working faces, the spatial distribution of stress can be characterized with areas of increased, reduced, and intact stress. The superposed stress of inclined seams that are very close to each other propagates through coal pillars in the bottom floor, and this propagation follows neither the line along the axis of the coal pillar nor the line perpendicular to the direction of the floor. It instead propagates along a line angled with the axis of the coal pillar. The roadway can be arranged in the area with reduced stress, to improve its the stability. Based on the computed spatial and temporal evolution of stress, an optimized layout of roadway was proposed. This layout features a reasonable interval between the mining roadway and a minimal proportion of increased stress areas along the mining roadway and is aligned with geological structures.

Download Full-text

Optimization Coal Pillar Size of Top Coal Caving Face with Dynamic Pressure Impact

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.675-677.1395 ◽

2014 ◽

Vol 675-677 ◽

pp. 1395-1400 ◽

Cited By ~ 1

Author(s):

Wen Zhou Li

Keyword(s):

Numerical Simulation ◽

Coal Mine ◽

Simulation Analysis ◽

Dynamic Pressure ◽

Coal Pillar ◽

Large Error ◽

Working Face ◽

Pressure Impact ◽

Mine Depth ◽

Pillar Size

AH Wilson coal pillar was used widely as it’s simply, but it’s appeared large error for field implementation as its difference assume conditions, mine depth H and mine thickness m. AH Wilson coal pillar formula was studied precisely by in-site stresses test and numerical simulation analysis for N3-5 top coal caving working face of CHANGCUN coal mine in Lu’an coal district of China, then modified AH Wilson formula was put forward as L = 0.008mH + 8.4,then the precise coal pillar size 18m was used in filed implementation, filed testing proved coal pillar size was reasonable.

Download Full-text

Numerical Simulation Analysis on Stability of Coal Pillar of Empty Mine Goaf in North of Shanxi Province

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.470.205 ◽

2013 ◽

Vol 470 ◽

pp. 205-210

Author(s):

Hao Tang ◽

Zi Guang He ◽

Hai Bo Lian

Keyword(s):

Numerical Simulation ◽

Simulation Analysis ◽

Coal Pillar ◽

Shanxi Province ◽

Analysis Model ◽

Term Stability ◽

Long Term Stability ◽

The Law ◽

The Stability

The analysis model of coal pillar of a empty mine goaf in north of Shanxi province was constructed and the process of coal pillar from formation to weathering was simulated through the application of software of FLAC3D in this article. The stressstrain and the law of plasticity transformation of coal pillar from formation to weathering were analyzed and the long-term stability of coal pillar was forecasted. The result showed that the stability of coal pillar was bad for excessive excavated and weathering and the coal pillar will be broken easier for pressure and shear.

Download Full-text

Research on the Design for Strip-Partial Mining Method under Villages at Xiaotun Colliery

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.361-363.217 ◽

2011 ◽

Vol 361-363 ◽

pp. 217-221 ◽

Cited By ~ 2

Author(s):

Rui Min Feng ◽

Jin Long Zhang ◽

Hui Fu ◽

Lei Pei

Keyword(s):

Numerical Simulation ◽

Simulation Analysis ◽

Coal Pillar ◽

Field Measurements ◽

Mining Method ◽

Pillar Stability ◽

Surface Movement ◽

Mining Condition ◽

Movement And Deformation ◽

Mining Scheme

Basing on the geological mining condition under villages at Xiaotun Mine, according to the existing theories of the strip-partial mining, using the method of analyzing the field measurements date and calculating by empirical formula, the safe range of mining and retained widths can be confirmed, the mining schemes for different widths of coal pillar can be designed, and the optimum scheme can be worked out; and then the coal pillar stability of each mining scheme will be calculated through numerical simulation analysis, providing the basis for appropriately selecting the optimum scheme; on this basis, through simulation prediction of the surface movement and deformation, the surface movement and deformation laws of strip-partial mining is revealed to guide production of Xiaotun colliery.

Download Full-text