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1997 annual ground control operating plan for the Waste Isolation Pilot Plant

Description: This plan presents background information and a working guide to assist Mine Operations and Engineering in developing strategies for addressing ground control issues at the Waste Isolation Pilot Plant (WIPP). With the anticipated receipt of waste in late 1997, this document provides additional detail to Panel 1 activities and options. The plan also serves as a foundation document for development and revision of the annual long-term ground control plan. Section 2.0 documents the current status of all underground excavations with respect to location, geology, geometry, age, ground support, operational use, projected life, and physical conditions. Section 3.0 presents the methods used to evaluate ground conditions, including visual observations of the roof, ribs, and floor, inspection of observation holes, and review of instrumentation data. Section 4.0 lists several ground support options and specific applications of each. Section 5.0 discusses remedial ground control measures that have been implemented to date. Section 6.0 presents projections and recommendations for ground control actions based on the information in Sections 2.0 through 5.0 of this plan and on a rating of the critical nature of each specific area. Section 7.0 presents a summary statement, and Section 8.0 includes references. Appendix A provides an overview and critique of ground control systems that have been, or may be, used at the site. Because of the dynamic nature of the underground openings and associated geotechnical activities, this plan will be revised as additional data are incorporated.
Date: February 1, 1997
Partner: UNT Libraries Government Documents Department

Geotechnical analysis report for July 1993--June 1994

Description: The geotechnical data from the underground excavations at the WIPP are interpreted and presented in this Geotechnical Analysis Report. The data are used to characterize conditions, assess design assumptions, and understand and predict the performance of the underground excavations during operations. The data are obtained as part of a regular monitoring program. The format of the Geotechnical Analysis Report was selected to meet the needs of several audiences. This report focuses on the geotechnical performance of the various underground facilities including the shafts, shaft stations, access drifts, experimental rooms, and waste storage areas. The results of excavation effects, investigations, stratigraphic mapping, and other geologic studies are also included. The report provides an evaluation of the geotechnical aspects of performance in the context of the relevant design criteria and also describes the techniques used to acquire the data and the performance history of the instruments. The depth and breadth of the evaluation for the different underground facilities varies according to the types and quantities of data that are available, and the complexity of the recorded geotechnical responses.
Date: August 1, 1995
Partner: UNT Libraries Government Documents Department

Health and safety evaluation of a modified tunnel-borer design for application to single-entry coal-mine development

Description: The health and safety analysis is part of an overall effort to identify and develop innovative underground coal extraction systems. The single-entry tunnel borer system was initially considered an innovative approach to underground mining because it exhibited a means of increasing the speed and efficiency of entry development by reducing the number of entries. However, to be considered a truly advanced system, the tunnel borer had to meet distinct safety criteria as well. The objective was to examine the tunnel borer design and determine whether it offset major health hazards, and satisfied the prescribed safety levels. As a baseline for comparison, the tunnel borer was compared against the continuous mining entry driving system. The results of the health analysis indicated that while the tunnel borer design offered improvements in dust control through the use of water sprays, a higher face ventilation rate, and the application of spalling rather than the conventional grinding process, it interjected an additional mutagenic is and toxic compound into the environment through the use of shotcrete. The tunnel borer system easily conformed with the prescribed fatality limit, but exceeded the required limits for disabling and overall injuries. It also exhibited projected disabling and overall injury rates considerably higher than existing continuous mining injury rates. Consequently, the tunnel borer system was not considered an advanced system.
Date: February 15, 1982
Creator: Zimmerman, W. F.
Partner: UNT Libraries Government Documents Department

Environmental assessment: low wall conveyor haulage demonstration program, Lewis County, West Virginia

Description: The low wall conveyor haulage demonstration program is a new method for surface mining of coal developed by Skelly and Loy, engineers-consultants for the U.S. Department of the Interior, Bureau of Mines, and the U.S. Department of Energy. The purpose of the experimental demonstration project is to achieve improved production and better resource recovery while enhancing and facilitating reclamation and land restoration. The low wall conveyor haulage method, which incorporates portable conveyor units to transport overburden material instead of using haul trucks, has potential economic, environmental and health advantages over other surface coal mining operations. The potential environmental advantages are: The length of open pit is less, thus decreasing the duration of time the pit is exposed to the elements; less heavy duty haulage equipment is used; routing of topsoil and burial of toxic materials becomes easier by use of a radial stacker; and backfilling and grading operations are more efficient with the use of a radial stacker. This mining method integrates mining and reclamation into a single unitized operation. Economically, investment in portable conveyors and maintenance of machinery should be less than costs associated with maintenance of haul trucks and scheduling should be somewhat less complicated. The inherent congestion of the pit area is greatly reduced. Mitigating measures to minimize adverse environmental impacts during demonstration program include sediment and drainage control structures, backfilling mineral extraction area to original contour, restoration and revegetation of the disturbed area, decreasing the length of open pit, and no downslope placement of spoil. Environmental monitoring during the demonstration program will include system monitoring, head-of-hollow fill stability monitoring, surface-water quality monitoring, ground-water monitoring, aquatic ecology surveys, wildlife surveys, and air quality monitoring.
Date: June 1, 1978
Creator: Ecker, R.M.
Partner: UNT Libraries Government Documents Department

Tunnel profiler: state of investigations on high-pressure waterjet assisted road profile cutting technology

Description: In order to widen the application range of mechanized tunnelling in the rock for application in hard-coal mining, less clumsy heading systems need to be developed. For this purpose industrial-scale tests are run on the test rigs of Bergbau-Forschung as well as on one colliery. For these tests a road profile cutting machine equipped with various sensors and with a high-pressure waterjet assist in addition to the classic hard-metal tools, is used. By systematic evaluation of test results, new application possibilities for this combined heading system are found. Particular importance in this context is assigned to reduced cutting force and extension of the application range to cutting of hard rocks. Investigations also are made for finding out whether by high-pressure waterjets on their own interesting heading performances can be achieved. Furthermore the use of chemical additives and new nozzle designs with consideration of their cost-effectiveness is discussed. The summary outlines technical and ergonomical advantages as well as further development.
Date: March 1, 1981
Partner: UNT Libraries Government Documents Department