Define Longwall mining. Longwall mining synonyms, Longwall mining pronunciation, Longwall mining translation, English dictionary definition of Longwall mining. n a method of extracting coal from a mine whereby a long wall of coal is mined at one time Col
Longwall definition: noting or pertaining to a means of extracting coal or other minerals in an underground mine from a continuous face, the roof before the face being supported at intervals by temporary or movable artificial supports.. See examples of L
The meaning of LONGWALL SYSTEM is a method of coal mining in which the working face extends entirely across the seam, the work proceeds either away from or toward the main shaft, and the roof is allowed to cave in behind the workers.
A definition of water-inrush-factor was presented,and the criterion about the instability of seepage flow of water in stratified rock mass was described by water-inrush-factor.Based on the column of rock mass in Longgu coal mine,the distributions of stress in mining floors were simulated by ...
Define longwall. longwall synonyms, longwall pronunciation, longwall translation, English dictionary definition of longwall. n a method of extracting coal from a mine whereby a long wall of coal is mined at one time Collins English Dictionary – Complete
In longwall mining method, one of the most important factor for production plannig and support design is geomechanical properties of hangingwall and behaviour of the roof strata during cool excavation. There are many mathematical formulations developed to determine the height of immediate roof but in...
longwall miningThe paper analyse the possibilities of mathematical definition of stress distribution curve in front of longwalls. Distribution analyses were based on measurements carried out on equivalent models. These stress measuremments are analysed as to how they can correspond with in-situ stress ...
In China, there are a large number of coal mine gobs have been formed as a result of longwall mining processes. These mine gobs contain an enormous amount of methane storage spaces within the gob formations. The methane storage spaces as well as guide methane drainage via vertical boreholes...
The key of safe and high efficiency mining in the longwall mining of steeply dipping seam is the effective control of surrounding rock,and the difficult point in surrounding rock control lies in the stability control of "support-surrounding rock" system.Based on the comprehensive definition and res...
KEYWORDS Methane drainage; longwall mining; protective/protected coal seam; multiple seams; FLAC3D software; stress relief zones 1 Background and Problem Statement Over 50% of the coal mines in China mine coal seams with high gas content. The definition of high gas content coal mine is very ...