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SME-ICGCM (1801)
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TITLE Subsidence and Uplift Prediction in German and Polish Hard Coal Mining
SUMMARY For the last 150 years, subsidence damage to the surface has been an unavoidable phenomenon associated with underground coal mining. In particular, the mechanization of mining methods in multiple seam mining and the concentration of mining activities in densely populated European metropolitan areas (e.g., Ruhr, Upper Silesian industrial region) have led to mining having a very strong influence on the earth?s surface. In both these regions, surface subsidence of more than 20m has been reported up...
AUTHOR Preusse, Axel
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 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 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 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 Post?Collapse Seismicity of the Crandall Canyon Mine Using Double Difference Relocations
SUMMARY In 2007, the University of Utah Seismograph Stations (UUSS) temporarily expanded its seismic monitoring network in Emery County, Utah, in response to the August 6 Crandall Canyon mine collapse that trapped six workers. In spite of this additional coverage, no seismic events were located in the area during a six-day period (gap) from August 8 to August 13.The Mine Safety and Health Administration (MSHA) ?Command Center Log Books? however, contain references to 16 instances of underground ?bumping...
AUTHOR Kubacki, Tex M.
TITLE A Management System to Develop Occupational Health & Safety in Ground Control Operations of Underground Mines
SUMMARY Falls of ground have historically been the main cause for fatalities in underground mines. Although recent advances in technology have reduced the number of such accidents, when failures occur they usually result in severe consequences. Risks of rock falls, use of heavy machinery and electrical apparatus, entry to confined spaces, working in noisy and dusty environments, and working on unstable platforms are some of the hazards in ground control operations. Managing these risks requires a manage...
AUTHOR Oraee, Kazem
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
TITLE The Estimation of Ground Control Risk By Real?Time Quantitative Visual Assessments
SUMMARY Roof and rib falls are the basic ground control hazards associated with underground roadways during development, stand up and, if applicable, retreat. Falls of ground can happen following the deterioration of supports or rock conditions over time, and particularly as a consequence of continuing rock deformation and/ or failure to install adequate support. Once developed, the risk of a failure is increased due to the effects of time as well as to front abutment stresses through retreat mining. Th...
AUTHOR Garcia, Alexander