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SME-ICGCM (1801)
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TITLE Field Measurements of Overburden Strata Deformation Response to Longwall Mining
SUMMARY "In order to monitor the overburden strata deformation over a longwall mining area in the Pittsburgh Coal Seam, three boreholes were drilled across the longwall panel. Each borehole employed multiple-point borehole extensometers (MBE) to monitor overburden strata movement during and after the longwall face passed under the study area. The longwall face in the study area was 1,428 ft wide and 4,000 ft long. The average mining height was about 7 ft. The overburden depth ranged from 550 ft to 650 f...
AUTHOR Du, Xinzhi (Thomas)
TITLE The Role of Gas Pressure in Coal Bursts
SUMMARY "Rock and coal fractures and micro seismic vibration are common occurrences during development mining. It is very uncommon for coal and rock to be propelled into the roadway during normal mining operations. However, such occurrences do occur and appear to require significantly more energy than is available from strain energy release during coal cutting. The sources of energy, which can contribute to the propulsion of coal from the face or ribs, are typically strain energy from the surrounding gr...
AUTHOR Gale, Winton
TITLE An Area Calculation of the ARBS Support Intensity
SUMMARY "The objective of this paper is to present the development of a software tool that will assist in an area calculation of the Analysis of Roof Bolting Systems (ARBS) support intensity while incorporating more detailed geology, stress, and intersection span input. In this area ARBS tool, a detailed CMRR distribution can be determined from the available geologic database at the mine. In addition, the overburden and multiple-seam stresses, as obtained from the boundary-element program LaModel, can b...
AUTHOR Heasley, Keith A. (primary); Nandula, Aanand ; Tulu, Ihsan B.
TITLE Changes in Stress and Displacement Caused by Longwall Panel Retreats
SUMMARY "Ground deformation and support response was monitored in a longwall gateroad as part of a research project into gateroad stability under changing loading conditions. In this study, instrumentation was installed in a gateroad located between two active longwall panels. The first panel to pass was the second panel in the district, and the second panel to pass the instrumentation sites was the third panel in the district. All of the panels in the district were right-handed. All of the instrumentat...
AUTHOR Gearhart, David F. (primary); Esterhuizen, Gabriel S. ; Tulu, Ihsan B.
TITLE Geotechnical Monitoring of Rock Mass and Support Behaviour around the UCG Georeactor: Two Case Studies in Polish Coal Mining Industry
SUMMARY "Underground coal gasification (UCG) provides a solution to supply electricity from high ash coal or deep deposited seams. The coal is consumed in situ, and, accordingly, the ash is left underground. UCG could play a major role in the future of coal, which is expected to fuel 44%of the worldÂ’s energy in 2030, in a more environmentally friendly and commercially viable manner. Nevertheless, it is known that the UCG can impact the environment. One of the most important factors in safe UCG process s...
AUTHOR Prusek, Stanislaw (primary); Lubosik, Zbigniew ; Rajwa, Sylwester ; Walentek, Andrzej ; Wrana, Aleksander
TITLE Management of Initial Convergence Events at Broadmeadow Mine
SUMMARY "Broadmeadow Mine is an underground longwall mine located in Central Queensland, Australia. The mine introduced a top coal caving (TCC) longwall face in 2013 but since then has experienced severe convergence events at the start of each panel after 60-70m of retreat, resulting in equipment damage and the longwall almost becoming iron bound. A significant geotechnical monitoring effort during LW10 and LW11 to characterise the caving mechanics and operational changes during LW11 were successful in ...
AUTHOR Coutts, R.J. (primary); Lynch, D.G. ; Martin, M.R. ; Mills, K.W.
TITLE Effect of Longwall-Induced Subsurface Deformations on Shale Gas Well Casing Stability under Deep Covers
SUMMARY "This paper presents the results of a 2017 study conducted by the National Institute for Occupational Safety and Health (NIOSH), Pittsburgh Mining Research Division (PMRD), to evaluate the effects of longwall-induced subsurface deformations within a longwall abutment pillar under deep cover. The 2017 study was conducted in a southwestern Pennsylvania coal mine, which extracts 1,500-foot-wide longwall panels under 1,185 feet of cover. One 650-foot-deep, in-place inclinometer monitoring well was d...
AUTHOR Su, Daniel W. H. (primary); Zhang, Peter ; Van Dyke, Mark ; Minoski, Todd
TITLE Field and Laboratory Studies for Mechanised Depillaring Under Easily Caveable Roof Strata
SUMMARY "A simple analysis of site conditions and capability of the mechanised depillaring (MD) operation found that this approach is suitable to address the strata control issues in coal pillar extraction under the weak and laminated roof strata of Pinoura mine. A continuous miner (CM) with a ram car and quad-bolter are used for single pass pillar extraction (first time in the country) to achieve a relatively faster rate of depillaring. A total of eleven panels are depillared under weak and laminated r...
AUTHOR Singh, Arun Kr. (primary); Kumar, Ashok ; Singh, Rajendra
TITLE Ground Response to High Horizontal Stresses during Longwall Retreat and its Implication on Longwall Headgate Support
SUMMARY "Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the longwall headgate and the requirements for supplemental roof support. In this study, a longwall headgate under high horizontal stress was instrumented to monitor stress change in the pillars, deformations in the roof, and load in the cable bolts. The ...
AUTHOR Zhang, Peter (primary); Gearhart, Dave ; Van Dyke, Mark ; Su, Daniel ; Esterhuizen, Essie ; Tulu, Berk
TITLE Experience of Using the ANZI Strain Cell for Three-Dimensional, In Situ Stress Determinations in Deep Exploration Boreholes
SUMMARY "This paper describes the Australia, New Zealand Inflatable (ANZI) strain cell, its operation, and recent development for overcoring in exploration boreholes. The ANZI strain cell is an instrument system that uses the overcoring method of stress relief to determine the three-dimensional, in-situ stresses in rock. The instrument has been used successfully for over three decades in numerous underground mining and civil projects, but technical advances over the last decade or so have allowed the sy...
AUTHOR Mills, Ken (primary); Puller, Jesse