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Keywords: pillar
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2001
... ABSTRACT: Underground stone mines in the United States generally use room-and-pillar mining method, and designing stable pillars, and knowing their behavior through the mine's life is of vital importance to avoid hazardous conditions. In the USA, empirical pillar strength equation and S-Pillar...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1118
... ABSTRACT: Time-dependent deformation occurs in rock pillars, and it affects the stability of the pillars and excavations. In this paper, time-dependent deformation behaviors of brittle rock pillars are studied using a grain-based time-to-failure model (GBM-TtoF). First, time-dependent...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1193
... ABSTRACT: Gas wells drilled through coal seams may be influenced by underground coal mining, especially longwall mining. To evaluate the stability of gas wells in longwall chain pillars, NIOSH has developed numerical models to calculate longwall-induced ground pressure, subsurface movements...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1238
... development. Literature suggests that the pillar structures in underground mines can also be regarded as support structures and their reaction to tributary and additional (abutment) stress can be viewed with respect to the ground reaction curve at the pillar location. This paper presents a series of 2D and 3D...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1599
... Abstract This paper investigates the applicability and operational characteristics of different partial pillar extraction methods for a room-and-pillar coal mining project located in the region of southern Africa. Three partial pillar extraction methods, i.e. the Pillar Splitting method...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1893
... ABSTRACT: . In the process of fracturing production, it is necessary for us to predict fracture conductivity in channel fracturing to gain optimized construction parameter, improve oil and gas production. However, due to the non-linear deformation of the proppant pillar after high pressure...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0016
... compression tests, and finally stress analysis. Under field investigations, scan-line mapping of joints indicated few major joint sets in the surrounding rock mass to the rockburst location. Stress analysis showed very high stresses in the chain pillars and low stress concentration at the rockburst site...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0022
..., which is located at 1000 m from the earth's surface and it was excavated in 1984 by using the room-and-pillar mining method. The shaft station is surrounded by several longwall panels that were exploited between 1984 and 1994. To assess the stress redistribution and the stored strain energy...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0043
... pillar Appreciation decision point forecast Scenario observational method deformation 1. INTRODUCTION Mines have largely adopted observational methods to manage risk arising from geotechnical uncertainty. In many jurisdictions, observational methods of risk management are mandated (eg, EN 1997-1...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0350
... ABSTRACT: Current research indicates that underground stability is a function of more than just pillar strength and tributary area loading. From pillar observations and numerical modeling results, one finds that stress interactions between the pillars and the surrounding rock mass can impact...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0325
... ABSTRACT: The National Institute for Occupational Safety and Health (NIOSH) first developed the Analysis of Retreat Mining Pillar Stability (ARMPS) program to help the U.S. coal mining industry to design retreat room and pillar panels. Similar to other pillar design methodologies, ARMPS...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0135
... ABSTRACT: Previous studies on the strength and deformability of pillars in hard-rock mines have demonstrated that the influence of natural fractures diminishes with increasing pillar width. Jointing conditions and fracture intensity/intersections play a critical role in the behaviour...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0298
... metals & mining seismic response seismic event pillar exclusion zone firing central pillar region seismicity support system Upstream Oil & Gas support design reentry protocol fractured rockmass deformation stope blast Energy demand 1. INTRODUCTION Mining-induced seismic hazards...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0234
... is also suitable for more soluble rocks. The mechanical consequences of dissolution are analyzed for two theoretical configurations, i.e., lens and pillar. 1. INTRODUCTION Many problems in geomechanics such as subsidence, sinkholes and collapses, are related to the dissolution of soluble rocks...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0384
... entries. structural geology Reservoir Characterization engineering property data mining Illinois metals & mining displacement shale development entry setup room fault plane rock mass engineering property gate entry longwall face rock mass pillar Chugh face area intersection...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1553
... ABSTRACT: Longwall gateroads employ several different pillar design concepts to maintain operational and safe access to and from the longwall face. One such design that is becoming more prevalent and still presents controversy is that of yield pillars. Yield pillars are believed to provide...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1566
... area. Part of this program includes using LiDAR measurements to assess the geotechnical condition of the rock mass and track movements of ground throughout the development of an instrumented pillar. A total of 79 LiDAR scans were collected from May 2017 through December 2018 that map the area...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1554
... the temporal evolution of seismicity allows us to study the evolving stress state in the volume of interest. In this case study, we investigate these trends before and after a damaging event in a pillar at Carola Mine, Chile. The temporal changes in the stress state are examined through the use of time...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1672
... extreme value distribution reservoir geomechanics Rock mechanics cohesion random model Upstream Oil & Gas correlation contour stability rock mass spatial correlation stochastic model Symposium spatial variance deterministic model pillar 1. INTRODUCTION Rock is heterogeneous...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1897
... Upstream Oil & Gas shale pillar fracture Rock mechanics geomechanics Symposium void 1. INTRODUCTION To establish and maintain well integrity to avoid leakage through wells is vital for production wells relevant for the petroleum industry, and for injection wells used for CO2 sequestration...

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