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SME-ICGCM (1801)
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SME-ICGCM
TITLE Application Of Time Domain Reflectometry To Mining
SUMMARY 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 fractures above a longwall coal panel and the second example involved the we of a)R to monitor rock mass deformation in the vicinity of a strip mine highwall. Bock mass deformation, strata separation and large block movement generated strains and failure along coaxial cables which were installed in d...
AUTHOR O'Connor, Kevin M.
PUBLISHED 1984
TITLE Proposed Criteria For Subsidence Damage To Buildings
SUMMARY 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 presents an approach to define and determine the extent of material damage due to subsidence from underground coal mining. The basic steps involved in the development of adequate criteria have been enumerated together with the approaches and methodologies used.
AUTHOR Bhattacharya, Swapan
PUBLISHED 1984
TITLE Displacement Discontinuity Method For Three-Dimensional Stress Analysis Of Tabular Excavations In Non-Homogeneous Rock
SUMMARY This paper describes a numerical method for calculating the three¬-dimensional stresses and displacements induced by tabular excavations in a rock mass consisting of parallel layers of distinct material properties. The method is based on the superposition of numerical solutions for elementary displacement discontinuities in a parallel layered rock mass. The method can be used to analyse complicated excavation layouts such as those encountered in room-and-pillar or longwall mining. The method ...
AUTHOR Wardle, Leigh J.
PUBLISHED 1984
TITLE Optimun Mining Plan for Multiple Seam Mining
SUMMARY Multiple seam mining and its associated problems are very serious in Southern West Virginia where poor planning or lack of knowledge in seam interaction often results in complete loss of coal properties. Several measures have been proposed to alleviate the interaction prob¬lems under various multiple seam conditions, but few of them are spec¬ific in terms of mining plan. Two parallel approaches are adopted for this paper. One is field investigation which consists mainly of mine site visits and g...
AUTHOR Su, Wen H.
PUBLISHED 1984
TITLE Prediction of Inter-Strata Movements Above Longwall Faces
SUMMARY This paper presents an analysis of measurements of inter-burden de- formations above six longwall faces. An attempt is made to demonstrate some correlation between the movements at the various sites, and to examine their importance with respect to predicting caving height, disruption of overlying seams, and disruption of aquifers. This analysis demonstrates some significant differences between predicted surface subsidence, and inter-burden deformation. In addition it is shown that the caving hei...
AUTHOR Styler, Neil, Ph.D.
PUBLISHED 1984
TITLE Pressure Measurements in the Gob
SUMMARY Gob pressure measurements were made in a Western U. S. coal mine as part of a long-term program to evaluate cave progress and to determine the influence of geological discontinuities on caving conditions, load transfer, and resulting instabilities. Gloetzl cells were selected for the measurements due to their simple, robust construction and a history of being able to monitor pressures in a broken medium. A methodology was developed for the successful installation and protection of the cells an...
AUTHOR Maleki, H.
PUBLISHED 1984
TITLE Controlled Load Development At Longwall Coalfaces
SUMMARY The effectiveness of coalface powered support depends upon its structural nature and the manner of application of the hydraulic system. A critical and largely unresolved feature of the system is the optimum setting pressure level at which a support should operate in its geological environment. This paper provides an argument for a generalised approach to the issue of setting pressure level quoting case study data for a high output British longwall installation.
AUTHOR Isaac, A. K.
PUBLISHED 1984
TITLE Determination Of Solution Cavern Spacing In Deep Salt Deposit
SUMMARY An engineering procedure for designing the minimum separation between solution mined caverns in bedded salt deposit Is described. The procedure Is based on data obtained by In-situ and laboratory test methods. The formulae utilize the concept that salt rock under high pressure in a deep salt rock deposit would behave as a perfectly plastic substance, and that the active opening surrounding a. typical- cavern could be described by a circular ellipsoid. The paper describes the calculations require...
AUTHOR Mraz, Dennis Z.
PUBLISHED 1984
TITLE Microcomputer Simulation of Rock Blasting to Predict Fragmentation
SUMMARY In order to reduce the complexity of mechanisms influencing rock- fragmentation by blasting a simulation approach is proposed, using the capabilities of micro-computer interactive graphics. Situations involving cratering and bench blasting are simulated, and both jointed and intact rocks can be subjected to explosive action, taking into consideration its breakage mechanisms. Size analysis curves relating rock distribution before and after the blasts are determined and compared with field d...
AUTHOR da Cama, C. Dinis
PUBLISHED 1984
TITLE Probabilistic Analysis of Blasting Impact on Open Pit Stability
SUMMARY A new probabilistic approach is introduced for slope stability analysis including adverse impact of blasting vibrations. The material strength within a slope area is randomized in this bi-variate joint probability analysis. To be a completely general engineering method, the new probabilistic approach employs the random variable transformation technique; the Hermite model of the Gaussian transformation function, which transforms the experimental histogram of strength values to the standard Gaussi...
AUTHOR Young, Dae S.
PUBLISHED 1984