• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2016 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2016 - Mines Theses & Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Mines RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    Login

    Mines Links

    Arthur Lakes LibraryColorado School of Mines

    Statistics

    Display Statistics

    Estimating the probability of satisfactory conditions for main entry intersections in a coal mine in weak rock under deep mining depth

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Stewart_mines_0052E_11105.pdf
    Size:
    4.171Mb
    Format:
    PDF
    Download
    Author
    Stewart, Collin L.
    Advisor
    Ozbay, M. Ugur
    Date issued
    2016
    Keywords
    intersection
    weak rock
    stability
    coal
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/170604
    Abstract
    The satisfactory condition of underground coal mine intersections is a fundamental requirement for the safe operation of any underground coal mine. A satisfactory intersection condition goes beyond prevention of a roof fall. It must include the ability of the intersection to safely perform its designed function. A satisfactory condition is especially important for those main entries that provide life-of-mine access; both to the current, active areas of the coal mine, and to the future mining areas of the coal reserve or resource. Life-of-the-mine access may be required for decades. The intersections in the main entries must provide safe, satisfactory conditions and performance during this time. Long-term, satisfactory intersection conditions are particularly problematic in a deep/weak rock coal mine environment characterized by: (1) mining depths greater than 800 ft, (2) a poor to fair quality rock mass above the coal seam (RMR ≤ 50); and, (3) very weak to weak rock strength conditions for the immediate rock strata above and below the coal seam (CMRR ≤ 35). This research collected, compiled, and analyzed a data set of the geometries, environments, and conditions of 884 intersections in the main entries of a longwall coal mine, operating in the deep/weak rock coal mine environment. The database compiled from the data set included binary, categorical, and numeric predictor variables. The research developed a binary outcome variable from the database, an intersection condition rating as Satisfactory or Not satisfactory, that included the design function requirements of each intersection over the life of the intersection. The data were analyzed and a list was compiled of statistically significant predictor variables impacting the satisfactory condition of an intersection at the mine. An intersection condition probability estimation model was developed from the derived outcome variable, the list of predictor variables, and the data set. The probability estimation model was derived using logistic regression. This research was unique because it collected a large database specific to the deep/weak rock coal mine environment in the main entries of an operating, longwall coal mine in the US. It is the first application of the logistic regression method to derive an equation for estimating the probability of satisfactory intersection conditions. The research developed a novel method for the in-mine evaluation and rating of the existing safety and conditions of a coal mine intersections that incorporates the conditions of the roof, ribs, floor, secondary and supplemental support, and function performance for use by the coal mining industry.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2016 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2022)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.