... as it affects the mechanical properties of the rock. The purpose of the present study is to investigate the fracture mechanism and specifically detect the crack initiation and crack damage stresses in a granite rock. For this purpose, stress-strain data were recorded and the acoustic emission method was used...

... Abstract We injected carbon dioxide (CO 2 ) into a hole drilled around 8 m long in a granitic hot rock from the floor of the tunnel. We drilled four AE (acoustic emission) monitoring holes parallel 1 m far away from the injection hole and monitored AE events induced with hydraulic fracturing...

... borehole drilled from a tunnel at 410 m depth. The facture process is mapped by an extensive array of acoustic emission and micro-seismic monitoring instruments. Results from three water-injection tests in Ävrö granodiorite indicate that the fracture breakdown pressure in tendency becomes lower...

... Abstract A near field network with 11 acoustic emission (AE) sensors was installed for the in situ underground experiment (Nova project 54–14–1) that took place 410 m below surface in the Äspö Hard Rock Laboratory, Sweden. The acquisition system for the piezoelectrical sensors has been...

... seismometers, geophones, high frequency accelerometers and acoustic emission sensors. The combined seismic network allowed for detection and detailed analysis of nearly 200 seismic events with moment magnitudes M W < −4 that occurred solely during the hydraulic fracturing stages. We relocated the seismic...

... and blunt bits while recording acoustic emissions ( AE ) and measuring- while-drilling variables. These are then utilised as inputs variables to the tool condition monitoring system. Acceptable pattern recognition rates were obtained for multiple input variables combinations with different pattern...

... mechanism reservoir geomechanics acoustic emission Orebody pillar size width-to-height ratio 2 dip angle shear stress Failure occur failure mode failure process pillar Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London...

... to the free face of an underground excavation at low confinement. A triaxial cell has been designed to examine spalling behavior of sedimentary rocks under low confinement up to 1 MPa. The triaxial vessel allows to measure axial and circumferential displacements, permeability as well as acoustic emissions...

... of parameters such as acoustic emission (AE) counts, electric potential, crack displacement, climatic conditions such as temperature, humidity, air pressure and rainfall was developed and utilized at Derinkuyu Underground City, Zelve semi-underground (cliff) settlements, Azimli underground storage complex...

... seismoacoustic systems in underground facilities and discussing more detailed on the long term acoustic emission (AE) acquisition system installed in the repository area. The used AE measurement method allowed a detailed short- and long-term, non-destructive supervision. With this technique is possible...

... under sub-zero temperatures is studied on acoustic emission apparatus. The results showed that, for frozen rocks, their splitting tensile strength increases as temperature decreases or water content increases, which is different from sandstone at room temperature. The variation of cumulative ringdown...

..., acoustic emission (AE) sensor is employed to measure micro fracture in a sample of bedded salt rock, taking from the PT Well No.1 at depth of 1719 m from ground surface, Henan Province, Central China, during whole creep test of 359 days. A variable-viscosity Abel dashpot is proposed to get a better...

.... However, because of its higher costs, it is important to use ID drilling in rock formations where it is strictly required. For that reason, this paper aims to develop an Artificial Neural Network (ANN) model in which rock properties and acoustic emission (AE) parameters are considered as main inputs...

...Rock Engineering and Rock Mechanics: Structures in and on Rock Masses Alejano, Perucho, Olalla & Jiménez (Eds) © 2014 Taylor & Francis Group, London, 978-1-138-00149-7 Quantifying the discrepancy in preloads estimated by acoustic emission and deformation rate analysis M. Karakus School of Civil...

... geology acoustic emission geometry Condition Monitoring Upstream Oil & Gas Rock mechanics monitoring emission analysis Reservoir Characterization hard rock rock cutting noise information carrier metals & mining real condition propagation state description status monitoring...

... Abstract The Aspö Pillar Stability Experiment (APSE), at SKB's Hard Rock Laboratory, involved the development of a pillar by excavating two deposition holes, 1m apart. The evolution of damage in the pillar was monitored by an ultrasonic acquisition system providing Acoustic Emission (AE...

...Eurock 2012 Page 1 Enhanced interpretation of fracturing from acoustic emissions and ultrasonic monitoring at the Aspö Pillar Stability Experiment J.R. Haycox, H.C. Moretti & J.M. Reyes-Montes Applied Seismology Consultants Ltd., Shrewsbury, UK R. P. Young University of Toronto, Toronto, Canada...

...Rock Mechanics in Civil and Environmental Engineering Zhao, Labiouse, Dudt & Mathier (eds) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-58654-2 Characteristic acoustic emission response of sandstone samples in uniaxial compression N. Slatalla & M. Alber Engineering Geology, Ruhr...

.... Uniaxial compressive tests are carried out to observe the features of TIR, acoustic emission and strain forewarning messages during the failure process. Statistical analyses on the forewarning stresses are conducted based on infrared radiation temperature, infrared radiation images, acoustic emission...

... ABSTRACT: Marble beam specimens were subjected to three point flexural loading. The progress of microscopic damage was monitored by recording the Acoustic Emission (AE) signals generated during specimen loading. Two well known Greek marbles were tested: the Dionyssos marble and the Volakas...