Organization / Society
| TITLE | Development Of A Resin Point Anchor |  |
| SUMMARY | The United States Coal Mining Indus- try had the opportunity to greatly improve their roof control techniques during the nineteen seventies by the use of fully grouted resin roof bolts. This new tool was first approved for underground coal mines by M.S.H.A. ten years ago and during the next decade has been perfected to meet many problems previously thought to be unsolveable. The initial approved cartridge was very similar to the ones used in Europe in the nineteen sixties and since then has unde... | |
| AUTHOR | Wilding, Richard R. | |
| PUBLISHED | 1981 |
| TITLE | Evaluation Of Existing Predictive Methods For Mine Subsidence In The U. S. | |
| SUMMARY | Two existing predictive methods were chosen for evaluation; an influence function (Gals Theory) and a profile function (hyperbolic). These were applied to several field measured subsidence pro¬files over United States coal mines. The effect of homogeneous versus non-homogeneous overburden on surface subsidence is demonstrated and the utilization of Bals Theory as a subsidence predictive method for both types of overburden is examined. The major factor affecting subsidence profile characte... | |
| AUTHOR | Adamek, Vladimir | |
| PUBLISHED | 1981 |
| TITLE | Inorganic Cement Grouted Bolt System | |
| SUMMARY | In 1975 the Bureau of Mines Spokane Research Center began a series of laboratory and field tests to investigate the feasibility of developing a substitute for the organic chemicals used in resin roof-bolting systems. An inorganic system, comprised of calcinated gypsum, an accelerator, and microcapsules of water was developed and patented by the Bureau in 1977. The system has several advantages including economics, non- toxicity, nonallergenic, inflammability, and is not based on petroleum produc... | |
| AUTHOR | Serbousek, M. O. | |
| PUBLISHED | 1981 |
| TITLE | Monitoring For The Evaluation Of The Stability Of Underground Openings | |
| SUMMARY | The purpose of deformation monitoring for the evaluation of the stability of underground openings is reviewed briefly and some results from laboratory tests of small tunnels are presented. The ground behaviour is described by comparison with the response of structural systems and illustrated by the data from the testing of small tunnels. It is concluded that the main objective of a deformation monitoring system for stability evaluation is to determine the actual process of deformation and instab... | |
| AUTHOR | Kaiser, P. K. | |
| PUBLISHED | 1981 |
| TITLE | Support Selection For The Multi-Lift Mining Method | |
| SUMMARY | Large quantities of high grade coal exist in thick seams in the United States. Many of these thick seams are too deep to be surface mined and do not lend themselves readily to underground extraction. To develop the new mining technology required to effectively mine thick seams, the Department of Energy has entered into a Cooperative Agreement with Mid- Continent Resources, Inc. to demonstrate the multilift longwall mining technique in a 28 foot-thick seam at their L.S. Wood No. 3 mine near Redat... | |
| AUTHOR | Goode, Claude A. | |
| PUBLISHED | 1981 |
| TITLE | Resupporting High Roof Falls | |
| SUMMARY | One of the most dangerous jobs in mining is that of resupporting the roof after a fall has occurred. The resulting cavity may be more than 30 feet high, with relatively unstable sides and roof. It is often impossible to proceed with rehabilitation without exposing men and equipment to unsupported rock. Temporary supports provide margin- ally effective protection because of the lack of available footing. Furthermore, the usual supports in rehabilitated fall locations are not permanent, require fr... | |
| AUTHOR | Chlumecky, Nicholas | |
| PUBLISHED | 1981 |
| TITLE | Design And Operation Of Powered And Entry Supports | |
| SUMMARY | The mechanical design of a roof support is basically a matter of a statics and dynamics problem, assuming of course, that the imposed loads and mining conditions are known. Here in the Appalachian coal fields the general conditions are known well enough to allow the majority of the proposed new faces of longwall to be furnished with standard commercially available supports equipped with suitable variants and options. While not trying to negate the primary importance of thoroughly investigati... | |
| AUTHOR | Hutchinson, Thomas L. | |
| PUBLISHED | 1981 |
| TITLE | An Overview Of Bureau Of Mines Ground Control Research | |
| SUMMARY | The Bureau of Mines has a long history of research in Ground Control. For many years, this work was done at Bureau facilities by Bureau researchers. As the tiles changed, however, the area of research interest broadened, and additional methods of implementation, such as con- tracts, were added. 'Ibis paper outlines the organization, goals, and methods of implementation of the Bureau Ground Control Program, along with procedures for project selection. This program organization is followed by seve... | |
| AUTHOR | Karhnak, John M. | |
| PUBLISHED | 1981 |
| TITLE | Ground Control In Multiple Seam Mining | |
| SUMMARY | The No. 14 Mine of United States Steel Corp- oration is located at Munson, West Virginia, in & Dowell County. The mine was originally assigned 7,530 acres of Pocahontas 3, 4 and 5 Seams. Production began in 1948 with a listed reserve of 64,500,000 in place tons. It was originally intended to superimpose the 4 Seam workings with the 3 Seamand mine the two simultaneously to minimize the effects of one seam on the other. Roof control problems and economic conditions led to the discontinuance of 4 S... | |
| AUTHOR | Stansbury, Robert A. | |
| PUBLISHED | 1981 |
| TITLE | Applications Of Reflection Seismics To Mapping Coal Seam Structure And Discontinuities | |
| SUMMARY | As a means of demonstrating the effectiveness of reflection seismology in determining continuity of coal seams, three U. S. field projects are reviewed. The three projects involve coals of varied thickness (2-14m) and age (Pennsylvanian to Eocene) from three coal areas of the U. S. (Pennsylvania, Wyoming, and Washington). Each project also employed its own particular seismic technique, recording system, and seismic energy source although all are considered state-of-the-art, high resolution, digi... | |
| AUTHOR | Dobecki, T. L. | |
| PUBLISHED | 1981 |