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|The unpredictable massive collapse of roof in openings developed under apparently safe and stable roof conditions in coal mines of the United States has been of much concern for many years. One type of massive caving phenomenon is often attributed to cutter roof, a failure that initiates at one and/or both upper corners of an entry and propagates nearly vertically resulting in overall failure with little or no warning. This paper reviews current methods being used to control cutter roof and suggests new alternatives. The impact of basic parameters that include mine geometry, overburden geology, rock properties, and in situ stress conditions is discussed in the context of their relationship to this problem. The effects of various stress control measures are investigated with model analysis to gain insight into means of reducing the high level of stress known to exist at the entry corners of a West Virginia coal mine prone to cutter roof. The results are presented in the paper and the feasibility of their practical implementation is discussed.|
Additional chapters/articles from the SME-ICGCM book Proceedings Second Conference On Ground Control In Mining
|A New Approach To The Design Of Multi-Entry Developments For||Manifestation Of Mine Pressure And Its Relations To Overlyin||Geotechnical Investigation For A Single Entry Design For Lon||Roof Falls And Caving In Longwall Mining Operations||Support Resistance And Roof Behaviour Of A Longwall Face Wit||State Of The Art Testing Of Powered Roof Supports||Some Structural Aspects Of Designing The Shield Supports||Design Considerations For Angle Bolters||Machine Design Parameters For High Seam Truss Bolting Applic||Design Trade-Off For Angle Roof Drilling||Hydraulic Tensioning Of A Birmingham Roof Truss||Current Trends In Roof Truss Hardware||The Search For A Method To Provide Warning Of Coal And Gas O||Methods Used To Monitor Roof Geology And Entry Supports||A Method For Estimating Western Coal Strengths From Point Lo||Coping With High Lateral Stresses In An Underground Illinois||Alternatives For Controlling Cutter Roof In Coal Mines||Remote Sensing Techniques In Mine Planning - Applications An||The Use Of A Graphic Mini-Computer System As A Rock Mechanic||Greater Safety With Increased Productivity Coal Mining Opera||Critical Roof Span Approach To Selection Of Proper Coal Mine||Roof Bolt Bond Tester; A Device For Nondestructive Testing O||Remote Control Roof Bolting||Development Cooperation Between Operator And Manufacturer -||Research, Development, And Use Of Steel-Fiber-Reinforced Con||TV Borehole Inspection And Vacuum Testing Of Roof Strata||Use Of Automated Resistivity System To Locate Potential Subs||Control Of Mine Subsidence Utilizing Coal Ash As A Backfill||Surface Flooding-Considerations For Mining Facilities Site S||The Formation And Effects Of Transient Abutment Stress Durin||Some Technical Considerations When Mining Under Bodies Of Wa|