Numerical Simulation Study on Determination of Coal Pillar Width for Large-section Roadway Driving along Next Gob
GUO Hui
WANG Xinping
Abstract：Aiming at the problem that the coal pillar width for large-section roadway driving along next gob was hardly determined, study was made on the characteristics of the yield failure and the law of stress distribution of coal pillars in different width by using numerical simulation of FLAC3D. The research results showed:①At the drivage stage, when the coal pillar width was 3 m and 4 m, the whole coal pillar was destroyed and its stress was approximately in triangular distribution; when the coal pillar width was more than 5 m, the coal pillar width without yield failure increased in a quadratic polynomial law, and its stress was approximately in trapezoidal distribution;②At the wining stage, the yield failure scope of coal pillar ' s surrounding rock gradually increased with the advance of the working face, the peak value of the vertical stress was higher than that at the drivage stage, and the vertical stress gradually evolved from the trapezoidal distribution to the triangular distribution, so support should be strengthened in 20 m ahead of the coal pillar;③The engineering practice showed that selected coal pillar in 5 m-wide and with good force condition can realize efficient and safe coal mining when necessary supporting measures were taken in coal winning.
Keywords：large sectionroadway driving along next gobcoal pillar widthnumerical simulationcharacteristics of yield failurestress distribution law
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 20-23 )