Search Documents
Search Again
Search Again
Refine Search
Refine Search
-
Aspect Ratio and Other Parameters That Affect the Performance of Burrell Can Roof Supports
By David F. Gearhart
The Burrell Can1 is a thin, steel, tubular shell filled with aerated concrete that is used as a roof support in coal mines. The Can height is always shorter than the mining entry, so it is capped with
Jan 1, 2012
-
Continuous Improvement In Cuttable Coal Rib Support In Australian Coal Mines
By Ghassan Skybey
Australian coal mines uses state of the art technology in coal rib reinforcement. This paper highlights the development over the past 15 years in coal rib support technology, along with the advantages
Jan 1, 1995
-
Proposed Criteria For Subsidence Damage To Buildings (d2ee0f1e-295b-4fb1-ab17-d19f1e17df4a)
By Swapan Bhattacharya
United States federal and state regulatory authorities require underground mine operators to adopt adequate measures to minimize material damage to the surface caused by nine subsidence. This paper pr
Jan 1, 1984
-
Non-confirmation Mathematics for Wall Rock Classification for Mine Support
By Guangyi Sun
Wall rock classification method for coal mine support is the main factor affecting mine support. It is greatly affected by the combined effect of randomness, fuzziness and human being's incomplet
Jan 1, 2005
-
Application Of Time Domain Reflectometry To Mining
By Kevin M. Connor, Malcolm J. McPhersqn
Examples are presented in which Time Domain Reflectometry (TDR) was employed to locate deformation of rock masses induced by mining. The first example involved motoring the propagation of overburden f
Jan 1, 1984
-
Potential Of A Void Diffusion Model To Predict Longwall Subsidence In The Illinois Coal Basin
In this paper, the authors attempt to apply a simplified non-homogeneous void diffusion model (NHVDM) to predict surface subsidence for longwall mining in Illinois. A generalized error function subsid
Jan 1, 1990
-
Requirements and Performance of Pumpable Cribs in Longwall Tailgate Entries and Bleeders
By Peter Zhang
Pumpable cribs are being increasingly used in longwall tailgate entries and bleeders for roof support under abutment pressure. Their high peak capacity and confinement-controlled yield characteristics
Jan 1, 2012
-
Field Experience Of Measuring The Acoustic Energy From A Hammer Blow To Coal Mine Roof And Its Relationship To Roof Stability
By Peter Altounyan
The rate of decay of the energy from a hammer blow to a coal mine roof is related to the size and nature of the contacts between the rock being struck and its surroundings The use of this principle as
Jan 1, 2000
-
Control of Hard-to-Collapse Massive Roofs in Longwall Faces Using a Hydraulic Fracturing Technique
By Hideki Shimando
Periodic weighting and windblast which are caused by the dynamic effects of overburden in a longwall panel significantly affect longwall mining This study describes past experience with wind blast
Jan 1, 1998
-
A Study On Stress Distribution And Reasonable Size Of Coal Pillar In A Coal Face
By H. C. Li
Mechanical models are established in accordance with the degree of mining on both sides of the coal pillar, and formulae were derived which calculated the superposition stress distribution and the wid
Jan 1, 1992
-
Factors Influencing the Occurrence of Coal Pillar Bumps at the 9-Right Section of the Olga Mine
By David C. Oyler
The Bureau of Mines conducted research at the 9-Right Section of the Olga Mine to determine the cause of bumps and aid in the development of appropriate control techniques. The purpose of this paper i
Jan 1, 1987
-
Surface Fracture Development From Mine Subsidence In Eastern Kentucky
By Clyde DeRossett
Surface fractures, sometimes of significant size, are observed in eastern Kentucky over high extraction areas. Field observations were correlated with mine maps and a regional subsidence prediction co
Jan 1, 1993
-
Application Of A Simplified Three-Dimensional Roof-Pillar-Floor Interaction Analysis Model For Subsidence Prediction
By Witold M. Pytel
A simplified, three-dimensional, time-dependent, mechanistic model of the overburden-coal seam-floor interaction has been developed and validated at two Illinois coal mines. The model based on the thi
Jan 1, 1992
-
Application Of Short-Term Time-Dependent Plate Loading Tests For Estimation Of In-Situ Elastic And Viscous Parameters Of Weak Floor Strata
By Gang Chen
This paper explores the possibility of using short-term time-dependent plate loading tests to estimate the elastic and viscoelastic parameters of the weak floor strata typically associated with coal s
Jan 1, 1990
-
Pillar Optimization For Initial Design And Retreat Recovery
By Charles Steed
The design of pillars in room and pillar operations is always a compromise between factor of safety and ore recovery. In actively mined and accessed areas the stability of pillars must be sufficient t
Jan 1, 2003
-
Coal Pillar Life Prediction in the Vaal Basin, South Africa
By J. Nielen van der Merwe
This investigation was done to develop a method to predict the lie of coal pillars. It has long since been known that coal pillars deteriorate over time, but there was no method to quantify the deteri
Jan 1, 1998
-
Comparative Studies In The Mechanics Of Grouted Roof Bolts
By Stephen P. Signer
To improve the understanding of the support interaction mechanics between grouted bolts and coal mine roofs and to help lay the foundations for improved design and evaluation techniques, the 0.8. Bure
Jan 1, 1988
-
An Analysis Of Longwall Shield Cycle Effectiveness By Polycorder Monitoring
By Greg Hendon
Various methods have been used to evaluate the effectiveness of shields in place. The most common method used is static recording of leg pressures by visually examining pressure gauges. In an effort t
Jan 1, 1990
-
Aspects of Chain Pillar Design in Relation to Longwall Mining
By B Whittaker
The paper examines the role of chain pillars in longwall mining layouts as used in several countries. The application of chain pillars in relation to their expected design role is discussed. An import
Jan 1, 1987
-
Application of the Coal Mine Roof Rating, Derived from Drill Core, in the Roof Support Design of a Coal Belt Conveyor Tunnel
By John Rusnak
The Coal Mine Roof Rating (CMRR) is a practical rock mass classification system for use in design of mine openings. Data can be obtained for this purpose from exploration drill cores if simple geotech
Jan 1, 1998