Explaining fundamentals of application of cable bolting for a thick seam depillaring,this paper summarizes the results of field studies conducted during adoption of this approach in more than fifteen panels of Madhusu...Explaining fundamentals of application of cable bolting for a thick seam depillaring,this paper summarizes the results of field studies conducted during adoption of this approach in more than fifteen panels of Madhusudanpur 7 pit and incline mine.Nearly 7.0 m thick Kajora top coal seam of this mine is developed on pillars along the floor horizon to an average height of 3.0 m,leaving a coal band of around 4.0 m along the roof.Analysis of procured core samples showed that roof strata are easily caveable with a caveability index value of around 2000 only.Easily caveable overlying strata and shallow depth of cover alleviated most of the expected strata mechanics problems of the thick seam mining.However,extraction of total thickness at shallow cover caused differential-subsidence and cracks on the surface.These manifestations were immediately tackled to avoid creation of a breathing path for spontaneous heating in the extracted area.展开更多
A firm may expand in two ways： by tangible expansion through an increase in the scale of the physical company, or by intangible expansion, an optimization process drawing on both the firm＇s physical entity as well a...A firm may expand in two ways： by tangible expansion through an increase in the scale of the physical company, or by intangible expansion, an optimization process drawing on both the firm＇s physical entity as well as virtual resources, producing borderless growth. We take a case study approach to explore borderless development at business, managerial, and operational levels and to study four facilitators of borderless development： information technology, the virtual world, virtual operations, and concentration on core business. We conclude that firms may achieve global dominance in their area of core competency through borderless development.展开更多
基金sponsored by the general manager,Kajora Area of Eastern Coalfield Limited(ECL).Co-operation of general manager of the Area,project officer,Madhusudanpur 7 Pit and Incline Colliery,manager and safety officer,Madhusudanpur 7 Pit and Incline Colliery in conducting this study is thankfully acknowledged
文摘Explaining fundamentals of application of cable bolting for a thick seam depillaring,this paper summarizes the results of field studies conducted during adoption of this approach in more than fifteen panels of Madhusudanpur 7 pit and incline mine.Nearly 7.0 m thick Kajora top coal seam of this mine is developed on pillars along the floor horizon to an average height of 3.0 m,leaving a coal band of around 4.0 m along the roof.Analysis of procured core samples showed that roof strata are easily caveable with a caveability index value of around 2000 only.Easily caveable overlying strata and shallow depth of cover alleviated most of the expected strata mechanics problems of the thick seam mining.However,extraction of total thickness at shallow cover caused differential-subsidence and cracks on the surface.These manifestations were immediately tackled to avoid creation of a breathing path for spontaneous heating in the extracted area.
文摘A firm may expand in two ways： by tangible expansion through an increase in the scale of the physical company, or by intangible expansion, an optimization process drawing on both the firm＇s physical entity as well as virtual resources, producing borderless growth. We take a case study approach to explore borderless development at business, managerial, and operational levels and to study four facilitators of borderless development： information technology, the virtual world, virtual operations, and concentration on core business. We conclude that firms may achieve global dominance in their area of core competency through borderless development.
