Download or read book Roof Bolting in the United States written by Edward Thomas (Mining engineer) and published by . This book was released on 1950 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Roof Bolting in the United States written by Edward Thomas and published by . This book was released on 1950 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Roof Bolting in the United States written by Edward THOMAS (Mining Engineer.) and published by . This book was released on 1950 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Roof Bolting Requirements Based on In Mine Roof Bolter Drilling written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof bolting systems. This research is to develop a method for predicting the roof geology and stability condition in real time during roof bolting operation. Based on this information, roof bolting design criteria for modern roof bolting systems will be developed for implementation in real time. For the prediction of roof geology and stability condition in real time, a micro processor was used and a program developed to monitor and record the drilling parameters of roof bolter. These parameters include feed pressure, feed flow (penetration rate), rotation pressure, rotation rate, vacuum pressure, oil temperature of hydraulic circuit, and signals for controlling machine. From the results of a series of laboratory and underground tests so far, feed pressure is found to be a good indicator for identifying the voids/fractures and estimating the roof rock strength. The method for determining quantitatively the location and the size of void/fracture and estimating the roof rock strength from the drilling parameters of roof bolter was developed. Also, a set of computational rules has been developed for in-mine roof using measured roof drilling parameters and implemented in MRGIS (Mine Roof Geology Information System), a software package developed to allow mine engineers to make use of the large amount of roof drilling parameters for predicting roof geology properties automatically. For the development of roof bolting criteria, finite element models were developed for tensioned and fully grouted bolting designs. Numerical simulations were performed to investigate the mechanisms of modern roof bolting systems including both the tension and fully grouted bolts. Parameters to be studied are: bolt length, bolt spacing, bolt size/strength, grout annulus, in-situ stress condition, overburden depth, and roof geology (massive strata, fractured, and laminated or thinly-bedded). Based on the analysis of the mechanisms of both bolting systems and failure modes of the bolted strata, roof bolting design criteria and programs for modern roof bolting systems were developed. These criterion and/or programs were combined with the MRGIS for use in conjunction with roof bolt installation.

Download or read book The Code of Federal Regulations of the United States of America written by and published by . This book was released on 1996 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Code of Federal Regulations is the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government.

Download or read book Roof Bolting in Underground Mining written by Syd S. Peng and published by . This book was released on 1977 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Roof Bolting the Delaware Aqueduct written by Douglas H. Platt and published by . This book was released on 1952 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Job Safety Guide written by United States. Mining Enforcement and Safety Administration. Division of Education and Training Services and published by . This book was released on 1973 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin written by United States. Bureau of Mines and published by . This book was released on 1956 with total page 1172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Bureau of Mines Health and Safety Publications written by United States. Bureau of Mines and published by . This book was released on 1947 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mine Flood Prevention and Control written by Everett Perry Carman and published by . This book was released on 1955 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Official Gazette of the United States Patent and Trademark Office written by United States. Patent and Trademark Office and published by . This book was released on 2002 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings New Technology for Coal Mine Roof Support written by and published by . This book was released on 2000 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rock bolting Theory and application in mining and underground construction written by Ove Stephansson and published by Routledge. This book was released on 2021-06-23 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: This includes the Proceedings of the international symposium, Abisko, Sweden, 28 August-2 September 1983. Rock bolts today represent the dominant support system in mines and underground structures. Some results and experiences are discussed to give a better understanding of the strength of individual rock bolts and systems of bolts, and the interaction between bolts and rock masses of various types. Topics covered are as follows: rock bolting in theory and experiments; design principles and experience; and ground control and instrumentation: cable bolting.

Download or read book Transfer Mechanics of Full column Resin grouted Roof Bolts written by Stephen C. Tadolini and published by . This book was released on 1991 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin written by and published by . This book was released on 1955 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of the Interior and related agencies appropriations for 1989 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Dept. of the Interior and Related Agencies and published by . This book was released on 1988 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt: