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Keywords: attenuation
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Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-107
... plane fracture figure anisotropic migmatite loading subvertical foliation threshold anisotropy wellbore design amplitude orientation azimuthal orientation microcrack czech academy attenuation Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-218
... dilatation selected emb ultrasonic dependence monitoring specimen reservoir characterization asr deterioration aggregate attenuation upstream oil & gas acoustic emission experiment reactivity disintegration alkali silica reactivity alkali-silica reactivity emission monitoring Rock...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-262
... reservoir characterization attenuation coefficient porosity group 1 compartment operation cii pore porosity quarry spatial attenuation group 2 upstream oil & gas evolution martinez-martinez garcia del cura correlation muckpile extraction operation dev std Abstract...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-091
... structures may increase. Thus, how to evaluate and control the adverse effect of boulder blasting on the neighboring structures, especially on the nearby tunnel segments, is important. upstream oil & gas tunnel 1 university boulder water-intake tunnel rock mechanic attenuation vibration...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-138
... attenuation earthquake estimation amplitude upstream oil & gas specimen earthquake magnitude reservoir characterization sensor seismological society likelihood estimation inequality deviation magnitude equation figure 1 figure 4 bulletin university journal central south...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-366
... planes and micro-discontinuities in the shale cause attenuation of the waves. Thus the AE waveforms that arrive at the sensor are a distorted and attenuated versions of the source waveform. KEYWORDS Shale, Acoustic emission, Waveform, Time domain, Frequency domain, Anisotropy, Attenuation, Source...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-390
... ABSTRACT Attenuation is a seismic wave propagation parameter that is used as criterion to evaluate geotechnical rock properties. The seismic attenuation coefficient ( s ) and the seismic quality factor (Qc) in the surface crust of a rock mass were estimated by using the coda wave concept from...
Proceedings Papers

Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-244
... or their reflectivities. Ground porosity or seismic attenuation can be estimated with lower spatial resolution. A 3-D image of P-wave reflection strength ahead can be obtained automatically and continuously along a tunnel when a vibration source and receivers are placed on the cutting wheel of a tunnel boring machine...
Proceedings Papers

Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-081
... as acoustic emission and thermographic methods (Luong 1992). Unlike most metals that are mass homogeneously produced, properties of rock are not unique especially in rock mass. In most rocks, both acoustic velocity and attenuation vary greatly. Upstream Oil & Gas excitation non-linearity ratio...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-236
... When stress wave propagates through fractured rock masses, the wave will be slowed and attenuated due to the presence of these fractures. If the amplitude of stress wave is large enough to mobilize nonlinear deformation of these fractures, they will present different effects on one-dimensional P...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-099
... and attenuation in jointed rock masses, when the explosive along explosion chamber is long enough and the joints are dense enough or uniformly distributed, the model can be considered as plane-strain problem, 2-D results are good enough to fit with test data. 2-D modelling, with much more details of rock masses...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-203
... medical imaging technique. An usual X-ray photograph is a shadow, picture to indicate features of attenuation of an X-ray beam through a body. On the other hand, X-rays CT makes it possible to evaluate the attenuation of X-ray at each point within a body, by digitizing shadow pictures taken from various...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-258
... Tomography) scans. The principle behind Rock3DTMis that seismic energy travels through different mate- rial types with different attenuation and velocity levels. Seismic waves will travel faster through competent or highly stressed rock than through broken rock or voids. A?v.antages of.the Rock3DTMsystem...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-119
...Ultrasonic velocity and attenuation during Brazilian test .' ," ./ ,l I rl ~ " -r- ." "d J . , t .i t 1 Vitesse et attenuation des ultrasons durant un essai bresilien «. , Geschwindigkeit und Abschwachung der Ultraschallwellen wahrend des brasilianischen Versuchs lIf' J r ;. ~ . 1 I If .! i...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-036
... based on the attenuation parameters. The usual analysis techniques (spectral ratio and rise time) are not of application in this problem, therefore an original processing of the recorded signals has been found, there based on the system identification (ARX model). It has permitted to model the direct...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-020
... log analysis electric discharge receiver Exploration Method Reservoir Characterization attenuation experiment electromagnetic wave well logging radiation pattern evaluation Upstream Oil & Gas amplitude spectra antenna transmitter spectrum borehole radar system application...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-193
.... The amplitude of the wave depends only on the source function q which includes the directivity and the geometrical spreading. If k is defined as the complex quantity: k = P + ia. (3.1) the imaginary part a describes the amplitude loss of the wave. Two physical phenomena contribute to the wave attenuation...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-109
... dry and saturated conditions, on S-wave velocities and attenuation. X8L 903-782 Figure 2. Schematic of an S-zone showing the braided pattern of anastomosing fractures. - t Pyrak-Nolte et al. (1990) found in laboratory tests on Stripa granite that the effects of a single fracture on seismic wave...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-107
... Upstream Oil & Gas marble aspect ratio matrix crack field Reservoir Characterization attenuation energy loss evolution theoretical calculation thermally porosity experimental result rock sample frequency Carrara geotechnical characterization hypothesis attenuation...
Proceedings Papers

Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-012
... Reservoir Characterization forage Stoneley hydraulic characterization gradient thermique log analysis sur lectrode thermique well logging profondeur borehole mettre hydraulique Upstream Oil & Gas attenuation nuation Elf Aquitaine fracture partir diagraphie ABSTRACT...

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