Roof instability characteristics and pre-grouting of the roof caving zone in residual coal mining
نویسندگان
چکیده
منابع مشابه
Mine Roof Condition and the Occurrence of Roof Falls in Coal Mines
Mine roof fall characteristics of 250 falls in 5 different room-and-pillar coal mines, located in Pike, Martin, and Floyd counties, Kentucky, were investigated to determine the relationship of selected parameters associated with roof failure and the assumed condition of the mine roof before failure. The selected parameters used in the study included: presence of cracks and water before the occu...
متن کاملInstability leading to coal bumps and nonlinear evolutionary mechanisms for a coal-pillar-and-roof system
This paper studies the unstable mechanisms of the mechanical system that is composed of the stiff hosts (roof and floor) and the coal pillar using catastrophe theory. It is assumed that the roof is an elastic beam and the coal pillar is a strain-softening medium which can be described by the Weibull s distribution theory of strength. It is found that the instability leading to coal bump depends...
متن کاملUse of fly-ash slurry in backfill grouting in coal mines
Cave backfill grouting implies grouting of the caving rock mass prior to it being compacted. The filling materials strengthen the caving rock and support the overlying strata to achieve the purpose of slowing down the surface subsidence. The broken roof will fail and collapse during mining operations performed without appropriate supporting measures being taken. It is difficult to perform conti...
متن کاملStudy on the Vibration Response Characteristics of Broken Roof Rock in Coal Roadway
Received: December 18, 2015 Revised: September 29, 2016 Accepted: October 18, 2016 Abstract: Background: Aiming at the challenges in control and perdition of roof strata which caused by the complexity of coal mine roof, the force and vibration characteristics of drill bit have been analyzed considering the coupling vibration between drill bit and coal rock, and the characteristics of coupled vi...
متن کاملA Fiber Bragg Grating-Based Monitoring System for Roof Safety Control in Underground Coal Mining
Monitoring of roof activity is a primary measure adopted in the prevention of roof collapse accidents and functions to optimize and support the design of roadways in underground coalmines. However, traditional monitoring measures, such as using mechanical extensometers or electronic gauges, either require arduous underground labor or cannot function properly in the harsh underground environment...
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ژورنال
عنوان ژورنال: Journal of Geophysics and Engineering
سال: 2017
ISSN: 1742-2132,1742-2140
DOI: 10.1088/1742-2140/aa8eb6