Subaudible noise during compression of rocks
Web25 Aug 2024 · Because the Kaiser effect of acoustic emission (AE) was discovered in rocks (Goodman 1963; Kaiser 1953; Barr and Hunt 1999 ), the Kaiser effect has been used as one of the means to measure ground stress (Jang et al. 2005; Zhao et al. 2012 ), but the existence of directionality of the rock AE Kaiser effect is still inconclusive, which casts … Web3 Aug 2024 · First, the relationship between the dynamic elastic modulus and residual strain is analyzed, and then the brittleness and damage of the rocks are quantitatively …
Subaudible noise during compression of rocks
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WebIn order to know the Kaiser effect of AE (Acoustic Emission) in triaxial directions of a rock mass, the Kaiser effect of AE in the granite specimens were investigated by applying the compressive pre-stresses of various intensities repeatedly on the respective directions to the specimens.From the testing results, it was found that the pre-compressed principal … Web1 Apr 2015 · The strength variation in rocks under mechanical loading without corrosive chemical environment was investigated by investigating the mode-I (tensile) fracture …
Web10 May 1974 · Subaudible noise during compression of rocks. Article. Jan 1963; RICHARD E. GOODMAN; Acoustical monitoring of rock specimens during cyclic compression tests has allowed recognition of similar ... Web3 Aug 2024 · These studies indicated that the fatigue mechanical properties of rocks are greatly affected by cyclic loading conditions, including the stress amplitude, loading frequency and waveform. Ge et al. ( 2003) studied the fatigue damage of sandstone, granite and marble specimens under cyclic uniaxial loading.
Web1 Jan 1979 · In acoustic emission studies on granite under uniaxial compression, clear hysteresis of emission numbers related to the stress history (Kaiser effect) was observed … Web1 Feb 1994 · The uniaxial compressive strength of the rock was 205 MPa. Cylindrical specimens, 36 mm in diameter and 90 mm long, the ends of which had been hand-lapped with fine particles of carborundum (# 800) to reduce noise from the interfaces, were used. Figure 1 shows a schematic diagram of the measuring system.
WebIt is worth noting that no matter the rock is under compression, shear, or tension, macroscopic large cracks are formed when the rock is broken, and high-amplitude, low-frequency acoustic emission signals are formed. ... R. E. Goodman, “Subaudible noise during compression of rocks,” Geological Society of America Bulletin, vol. 74, no. 4, pp ... la kabann morlaixWebThe laboratory tests were carried out by loading the rock to a constant stress maximum ranging between 40% and 80% of failure stress in the initial cycles, and then by … jemma joblingWebNevertheless, the principal mechanism does not depend on the scale: The rapid release of elastic energy by processes of crack growth or deformation within the rock generates … la kabbalah de la tefila con kavanahWeb23 Nov 2010 · This paper is focused on the development of the AE test. The research has started to study the phenomenon of stress memory in a rock sample, the factors … jemma jurichWeb23 Nov 2010 · The research has started to study the phenomenon of stress memory in a rock sample, the factors influencing the phenomenon, and finally, to determine the in situ stresses around underground excavations by applying the AE method. ... Subaudible noise during compression of rocks. Goodman, RE. Stresses in rock. Herget, G. Underground … jemma jones albert goodmanWeb20 Apr 1981 · In this paper, we study the influence of water and temperature under uniaxial compression, because rocks in the earth's crust are saturated and subjected to high … laka bar gdanskWebIn this paper we present a new method by which the maximum previous stress in rocks can be directly estimated without any post signal analysis. In the new method, simultaneous … la kabbalah de la tefila con kavanah pdf