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Articles 91 - 95 of 95
Full-Text Articles in Engineering
Bounds For The Best Constant In An Improved Hardy-Sobolev Inequality, Nirmalendu Chaudhuri
Bounds For The Best Constant In An Improved Hardy-Sobolev Inequality, Nirmalendu Chaudhuri
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
The Coal Mine Roof Rating In Mining Engineering Practice, C. Mark, G. M. Molinda
The Coal Mine Roof Rating In Mining Engineering Practice, C. Mark, G. M. Molinda
Resource Operators Conference
The Coal Mine Roof Rating (CMRR) system was developed ten years ago to fill the gap between geologic characterization and engineering design. It combines many years of geologic studies in underground coal mines and worldwide experience with rock mass classification systems. Like other classification systems, the CMRR begins with the premise that the structural competence of mine roof rock is determined primarily by the discontinuities that weaken the rock fabric. Since its introduction, CMRR has been incorporated into many aspects of mine planning, including longwall pillar design, roof support selection, feasibility studies, and extended cut evaluation. It has also become …
Respirable Dust Results From Nsw Longwall Mines, K. Cram
Respirable Dust Results From Nsw Longwall Mines, K. Cram
Resource Operators Conference
An outline of airborne dust sampling methodology, instrumentation and exposure standards in the New South Wales coalmining industry are presented combined with the results of dust monitoring of the mining industry workforce with particular emphasis on longwalls. The overall improvements to workforce exposure levels and the systems and techniques which led to these improvements are dealt with, as are respirable quartz levels, together with sources and difficulties of compliance with the Coal Mines Regulation Act (CMRA) 1982 requirements. The non-punitive nature of the regulations combined with the mutual co-operation between management and unions in the interpretation and use of monitoring …
Update On Outbursts And In-Seam Drilling In 2002, J. Hanes
Update On Outbursts And In-Seam Drilling In 2002, J. Hanes
Resource Operators Conference
There have been some developments in understanding the outburst mechanism and improving the control of in seam drilling. Experience with techniques for draining from the surface has shown promise. There is a need for operators to provide facilities for more research so that the outburst phenomenon can bet better understood.
Controlling And Reducing Heat On Longwall Faces, P. Mitchell
Controlling And Reducing Heat On Longwall Faces, P. Mitchell
Resource Operators Conference
In recent years uncomfortably high ventilation temperatures have become more common on longwall faces in Australian coal mines. Increasing strata temperatures at relatively shallow depths in combination with high surface ambient temperatures, particularly in Queensland, have led to high intake temperatures. These have approached trigger levels that introduce reduced face operator exposure times. With the addition of heat from coal breakage and goaf caving on high production longwall faces the working environment has become uncomfortable and continuous exposure over a shift is potentially injurious to health. Typical strata temperatures at 200m depth are 35ºC increasing to 38ºC at 350m depth. …