... shear displacement upstream oil & gas casing design reservoir characterization casing deformation caliper metals & mining longwall abutment pillar pillar coal seam ground control comparison longwall mining ARMA 22 280 Comparison of Measured and Modeled Casing Deformations...

... displacement proceedings Symposium vertical stress US government complex reservoir instrumented pillar Upstream Oil & Gas calibration roof sag rib displacement coal seam gas Ground Control loading condition average roof sag fracture strength field observation instrumented site coal-mass...

... ABSTRACT: Ground control has been and continues to be a major problem facing underground mines around the world. Unplanned fall of ground (FoG) can lead to ore loss, accidents, fatalities and production delay. Hence, FoG is of critical importance to the design of underground mine excavations...

... modeling in ground control will always be a data-limited problem. Material properties, in-situ stresses and discontinuities in the rock mass are poorly described and their natural variability is often unknown. Nevertheless, this uncertainty can be diminished by following a validated modeling approach while...

... eastern and western U.S. mines. Reservoir Characterization US government Artificial Intelligence reservoir geomechanics esterhuizen Ground Control subsidence pillar overburden coal material proceedings gob parameter mining strength sandstone MPa metals & mining field...

... conditions, standing support is shown to be inadequate to control convergence for the weakest geologic conditions. This prediction is in agreement with underground observations in other similar mines experiencing ground control problems with pre-driven longwall recovery rooms using rock reinforcement...

... Abstract: The physical, structural, and depositional features of the immediate above seam strata which characterize San Juan Mine are localized in extent; regional scale features having little direct influence. Four primary drivers of ground control difficulties associated with the immediate...

... Abstract China is the world's largest coal-producing country and its coal production was 3.57 billion ton in 2014, of which underground longwall mining accounts for more than 85%. China has achieved great progress in ground control of underground mining. Many theories are well applied to coal...

... Abstract: The overburden strata movements, from the immediate roof up to the ground surface, caused by underground longwall mining subsidence, are essential for analyzing related ground control problems and improving mine planning and developments. A good subsurface subsidence prediction...

... at an Illinois Basin coal mine and then discusses the results from a numerical modeling exercise conducted to explain the observed bolt performance. metals & mining reservoir geomechanics Upstream Oil & Gas bolt head instrument Axial bolt load pull test Ground Control instrumented bolt...

... and development Reservoir Characterization displacement axial Ground Control Upstream Oil & Gas rock bolt metals & mining faceplate rock bolt behavior proceedings loading load distribution strain gauge international conference rock mass grouted rock bolt situ performance new technology...

... Modeling & Simulation Ground Control diameter strength experiment metals & mining strand laboratory resin cable bolt individual wire anchorage stiffness civil application anchorage capacity rock mass indentation cable deformation transfer mechanics ABSTRACT: PC...

... on the measured values of the abutment extent and abutment load. REFERENCES 1. Mark, C. 2009. Deep Cover Pillar Recovery in the US. In Proceedings of the 28th International Conference on Ground Control in Mining, West Virginia University, Morgantown, WV, July, pp. 1-9. 2. Mark, C., 1992. Analysis of Longwall...

... International Conference in Ground Control, WV University, August 6-8, pp. 98-104. 4. Wilson, A. H. An Hypothesis Concerning Pillar Stability. Min. Eng. (London), v. 131, 1972, pp. 409- 417. 5. Maleki, H. 1992, In-Situ Pillar Strength and Failure Mechanism for U.S. Coal Seams. Proceedings of International...

... ABSTRACT: Rock burst is one of the greatest challenges to ground control in the mining industry. There are more and more industry requirements on yielding rock support. Since 2008, Jennmar has been conducting large scale research and development works to develop a technically reliable and cost...

... ABSTRACT: A method is presented for creating realistic numerical models for practical coal mine ground control. The method includes procedures to collect the necessary mechanical input parameters from a geologic core log, procedures to set up a model and procedures to interpret calculation...

... part of the strategic goals of the National Institute for Occupational Safety and Health (NIOSH) research program that addresses safe ground control practices for coal mines. US government structural geology Reservoir Characterization Upstream Oil & Gas strength Ground Control...

... stress horizontal stress maximum horizontal stress Iannacchione proceedings roof failure maximum stress stability international conference US government roof instability Morgantown Roof Stability Limestone Formation Ground Control layout excavation tectonic stress 1. BACKGROUND...

... industry aware of both the effects of horizontal stress and the means of mitigating these effects. NIOSH and others have used several techniques to measure horizontal stress and assess its potential for causing ground control problems, including the "stress mapping" technique (Mucho & Mark 1994...