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SME-ICGCM (1801)
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TITLE Recent Developments on Surface Ground Strain Calculations Due to Underground Mining in Appalachia
SUMMARY The prediction of ground movements due to underground mining using the influence function method is a mature technology, widely used by researchers and planning engineers around the world. Surface strain, either tensile or compressive, is an important indicator of potential impacts on structures such as buildings, bodies of water, pipelines, railway and power lines, and tailings dams. Calculation of static or dynamic surface strains, for varying surface terrains and slopes, should be accurately ...
AUTHOR Agioutantis, Zach G
TITLE Biaxial Horizontal Swelling Strains in West Virginia Coal Mine Roof Rocks in Response to Moisture Adsorption
SUMMARY Study of moisture-induced swelling strain in Pennsylvanian Period rocks of the Appalachian Plateau in West Virginia shows a 2:1 biaxial horizontal anisotropy which trends NW-SE. Oriented in-situ slabs of coal mine roof rock were collected across West Virginia, dry-sawed to size, air-dried to stability, and then monitored for moisture changes and deformations in the horizontal plane through one wetting cycle and drying cycle. Biaxial swelling strains were exhibited in nearly all rocks tested, wit...
AUTHOR Hieb, Monte R
TITLE Research on the Characteristics of Mine Pressure and Overlying Strata Movement in Downward Mining Longwall Panels in Steeply Dipping Seams
SUMMARY Many longwall panels in China are laid out along the dip direction such that the direction of longwall retreat mining is along the strike direction of coal seams. Downward mining longwall panels in steeply inclined seams refers to those that are laid out in a non-uniformly developed fold structure where the seam is not only steeply dipping, but also highly undulated along the strike direction, causing longwall mining extremely difficult because it has to deal with large dip angles that vary both...
AUTHOR Cheng, Jingyi
TITLE Influence of Mine Layout, Mining Method, and Geology on Down?Dip Coal Barrier Performance at the Solar No. 7 Mine
SUMMARY The Solar No. 7 and Solar No. 10 mines were designed to prevent mine waters from directly discharging to the surface. In January of 2004, a discharge occurred as the Solar No. 7 mine was in its final stage of flooding through a barrier averaging 456-ft in width over a 1,600-ft length (No. 1). Another barrier (No. 2) was designed to protect four municipal water wells operating 1,800- ft away and producing from within or slightly below the Upper Kittanning coalbed from the adjacent Solar No. 7 and...
AUTHOR Iannacchione, Anthony T
TITLE The Evaluation of Empirical Coal Pillar Strength Formula Based on Uncertainty Criterion
SUMMARY Several empirical equations to estimate coal pillar strength have been presented in academic studies. The development processes of these equations are similar and are usually obtained by fitting the mathematical function (curve) to field data. One of the best criteria to evaluate the quality of fitting for such equations is the correlation coefficient R2, which has limited applicability. It is necessary to calculate the correlation coefficient access to the initial data for which the equation is...
AUTHOR Hosseini, Navid
TITLE Probabilistic Approach to Coal Pillar Design
SUMMARY The classical approach to engineering design involves the purely deterministic calculation of the factor of safety, the ratio of strength to stress. The factor of safety is an easy calculation to perform in many circumstances, and it is very easy to interpret the results. The simplicity of the method is both a strength and a weakness. The results of the deterministic factor of safety calculation are simple to determine and interpret, but they have no ability to account for the uncertainty presen...
AUTHOR Fahrman, Ben
TITLE Validation of Entry Stability Factors Determined By the Strength Reduction Method Against Empirical Approaches
SUMMARY The design of support for underground excavations is a complex process in which the interaction between supports and the rock mass must be evaluated. The strength reduction method (SRM) is useful because it provides a stability factor of the supported excavation that can easily be compared between support alternatives. The method is based on numerical model analysis where the stability factor is determined by reducing the rock mass strength until collapse is indicated in the model. This paper pr...
AUTHOR Esterhuizen, Gabriel S
TITLE Prediction of First Weighting Distance in Longwall Coal Mining By 3D Numerical Modeling ? A Case Study
SUMMARY In longwall coal mines, estimation of roof strata condition, sequence of loading, and supporting requirements are of a high degree of importance, and they are directly related to production and safety. Also, a prediction of the initial caving distance is rather complicated to calculate, because there are many parameters that effect caving process?roof and floor strata conditions, thickness of immediate roof, depth of cover, excavation geometry, and magnitude, and direction of principal stresses....
AUTHOR Manteqi, Haile
TITLE A Comprehensive Analysis of Cable Bolt Anchorage Characteristics
SUMMARY Cable bolts anchored with traditional two component polyester resin cartridges have successfully supported difficult roof conditions in underground mines. Resin cartridges provide a costeffective cable bolt anchoring system with consistent anchorage performance characteristics when properly installed. The most commonly used cable bolts in the U.S. mining industry are 270 ksi (1,862 MPa), 0.7 and 0.6 inch (18 and 15 mm), seven-strand smooth cable with resin mixing bulbs (also known as bird cages)...
AUTHOR Faulkner, Dakota D.
TITLE Application of Neuro?Fuzzy Technique in Mine Support System for Ground Control
SUMMARY In underground activities ground control is a challenging problem. It affects safety, production, and efficiency. As per statistics of accident data, ?fall of roof/sides? is one of the major causes of mine accidents. In many cases, our experiences and understanding of soil and rock behavior still fall short of being able to predict how the ground will behave. Presently, empirical approaches to design are widely used in estimating mine support parameters. Under these circumstances, expert judgmen...
AUTHOR Kashyap, Sudhir Kumar