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Keywords: extraction
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1260
... ABSTRACT: The efficient harvest of geothermal energy, especially geothermal electricity generation, has been an international research hotspot and challenge for decades. However, the conventional geothermal exploitation technologies with water extraction bring on many issues such as high...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1611
... ABSTRACT: Heat exchange and energy extraction from a low-permeability reservoir are important processes for EGS design. Cold water is circulated from a wellbore and carries warmer water up to the surface. Depending on the circulation velocity and temperature out to the surface, different...
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-2019-1569
... ABSTRACT: Mining-induced fracture fields play important role in gas extraction of underground coal mines. Low concentration of extracted gas has been observed during the mining of gas burst-prone coal seams in Shaqu Coal Mine, Shanxi province, China. Theoretical analysis and field observation...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1590
... changes and the accidental failure of gas transmission pipeline. In this paper, the construction and operation stability of gas storage in layered salt rock are employed as the research topics. The optimal gas injection and extraction operation schemes are determined by studying the operating...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1857
... ABSTRACT: A fully coupled thermal-hydraulic-mechanical (THM) model was developed to investigate the heat extraction process of an artificial enhanced geothermal system (EGS). The random fracture network in the stimulated geothermal reservoir was generated by the fractal theory. The local...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2063
.... reservoir geomechanics stability analysis extraction Reservoir Characterization stope calibration metals & mining paste-fill material underhand mining Upstream Oil & Gas Simulation peak particle velocity mining method dynamic analysis paste-filled stope horizontal stress stability...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-655
... ABSTRACT: The Santo Niño ore body at Pinos Altos Mine has been in production since 2009 using both open pit and underground mining methods. Between 2015 and 2017 an extensive study was conducted to evaluate extraction of the crown pillar which remained between the open pit and underground...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-678
... of a tensioned cable as strands were cut through. Upstream Oil & Gas strand load loss cable anchor deformation extensometer electronic load indicator excavation instrumentation metals & mining ground closure Anchor emca mechanical anchor longhole stope extraction underground...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-680
..., the excavations required support tendons to improve their stability. Numerical analysis on ground closure indicated a ground closure of 400mm during the extraction of primary stopes, followed by deformation of about 600mm at the first extraction of secondary stope and eventually 800mm deformation was simulated...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-325
... to cave after the extraction of coal, leading to high abutment pressures applied on the tailgate and a bleeder entry and the subsequently large deformation. Hydraulic fracturing was performed on a trial basis to “soften” the massive sandstone so that it can cave after the longwall face passes...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-981
... ABSTRACT: Geothermal energy from naturally or hydraulically fractured reservoirs is extracted by cold water injection and circulation using injection and production wells. Well spacing, well pattern, and injection-extraction rate schedule are among the most important factors that control...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-101
... of understanding. This paper investigates the superiority of L-CO 2 as a fracturing fluid for coal seam gas extraction, in terms of break-down pressure and acoustic emission (AE) energy release during fracture propagation. The results reveal that L-CO 2 induced break-down pressure is around 19.6% lesser than...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0515
... ABSTRACT: Biological and engineering flow systems maximize their efficiency by following the path of minimum energy over the domain they are embedded in. This fact motivates the present research, since industrial fluid extraction and injection processes are designed to minimize...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0890
... ABSTRACT: In order to understand how the rock mass evolves with extraction in the particularly highly-stressed environment of a sill pillar in a hard rock mine in North America, we investigate the utility of seismic tomography as an interpretive tool. We use a rich dataset of blasts...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-1021
... the surface through numerical simulation using Fast Lagrangian Analysis of Continua (FLAC3D). Four different height of extraction i.e. 3m, 5m, 6m & 7m has been excavated numerically to evaluate the induced stress value and its parametric variation with the different height of extraction. Factor of safety...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0033
... for an increase in ore recovery, it is important that engineering and operations personnel have a clear understanding of the fill material as well as the limitations of the fill design to provide the most efficient, cost-effective, and safe extraction of underground reserves. Despite extensive use of CPB in mines...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-144
... Abstract: Legal license boundary restrictions and economic considerations for extraction of vein type iron orebody in Erzincan/Bizmisen area of Turkey limit the overall production by open pit mining. Based on overall Stripping Ratio (OSR) assessments, ore production is decided to proceed...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-355
... Abstract: An underground iron mine in China has been used as a case-study to research the subsidence due to ore extraction and backfilling during open stoping operations. A 3-D discontinuum numerical model was built to scale incorporating geologic complexities including faults and interfaces...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-198
... geomechanics extraction strata goaf property 1. INTRODUCTION As the longwall face advances, the immediate roof overlying the coal seam, consisting of weak beds, readily cave behind the supports. The main roof lying above the immediate roof consists of strong rock beds and is self- supporting within...

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