A non‐destructive method of determining rock strength

Allison, Robert J.

doi:10.1002/esp.3290130807

Cited by 35 publications

(23 citation statements)

References 11 publications

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“…Two studies which use laboratory simulation to measure the effects of fire on rock weathering are reported by Goudie et al (1992) and Allison and Goudie (1994). They use a furnace to heat rock samples and establish changes to Dynamic Young's Modulus, using non-destructive ultrasonic methods (Allison, 1987(Allison, , 1988(Allison, , 1989. Modulus of elasticity provides an indication of rock susceptibility to weathering and disintegration.…”

Section: Introductionmentioning

confidence: 99%

The effects of fire on rock weathering: some further considerations of laboratory experimental simulation

Allison

Bristow

1999

Earth Surf. Process. Landforms

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Fire in the natural environment is a widespread agent of geomorphological and biological change. Temperatures can exceed 1000 C. There is often a rapid rise from ambient conditions through a steep thermal gradient, promoting rock disintegration. Laboratory simulation studies have established that temperature changes which are representative of natural fires affect rock material properties, which can then be related to weathering susceptibility. This study extends previous work by more closely replicating the natural environment, (a) through the simulation of rainfall and (b) by encasing samples to reflect the exposure of a single rock face to a passing fire event. Rock samples collected on Cyprus were prepared and tested following previously reported procedures. Change in modulus of elasticity was monitored using a non-destructive ultrasonic method. The data corroborate previous work but with somewhat different degrees of change. The new results are more likely to be representative of natural conditions and real-world change. The rate of rock disintegration and effects such as casehardening appear to be a function of rock thermal characteristics, material properties and environmental constraints such as diurnal temperature range.

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Section: Introductionmentioning

confidence: 99%

The effects of fire on rock weathering: some further considerations of laboratory experimental simulation

Allison

Bristow

1999

Earth Surf. Process. Landforms

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“…For unconˆned samples, the shear (VS) and compression (VP) waves velocities were deduced from the fundamental resonant frequency of S1 and S2 samples using a non-destructive device, called GrindoSonic (Allison, 1988). The GrindoSonic device is used to generate and detect a short transient vibration propagating through a cohesive sample resulting from a mechanical disturbance caused by a light mechanical impulse, generated by a light plastic hammer blow.…”

Section: Grindosonicmentioning

confidence: 99%

Elastic Parameters of Intermediate Soils Based on Bender-Extender Elements Pulse Tests

Murillo

Sharifipour

Caicedo

et al. 2011

Soils and Foundations

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The elastic behaviour of compacted soils subjected to very small strains (smaller than 10 -5 ) is essential, because the serviceability of most geotechnical structures depends on soil elastic properties. Small-strain stiŠness of soils was studied in the past years using diŠerent experimental devices (mainly resonant columns). However, the results have been relatively inconsistent. The bender elements technique, now extensively used in soil mechanics, oŠers an e‹cient non destructive alternative, since it is based on the propagation of shear waves. To enrich the common bender elements testing results providing only shear modulus values, an evolution of the bender elements technique, named bender-extender element's is used in this paper. This device allows the simultaneous measurement of the shear and compression wave velocities. As a result, the two independent elastic constants are measured for the same sample in order to avoid indirect estimations. Also, for unconˆned sample's the GrindoSonic test is performed: this test is based on the transient vibrational response of the sample to a slight shock. The present study provides new results about the elastic properties of intermediate unsaturated soils made of mixtures of sand and clay. The results for the elastic properties are presented as a function of the suction level. Finally, a model relating the elastic behaviour of these unsaturated soils is proposed.

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“…Le premier consiste à émettre des ondes ultrasonores unidirectionnelles au travers de l'échantillon et à calculer leur vitesse de propagation V (tableau 9). Le second, appelé GrindoSonic (Allison, 1988), consiste à exciter l'échantillon par un choc élastique, suivant deux modes de sollicitation distincts (flexion et torsion) et à recueillir la réponse vibratoire qui en résulte. On détermine la fréquence de résonance puis on calcule les caractéristiques élastiques (tableau 9).…”

Section: Paramètres éLastiquesunclassified

Identification des paramètres de comportement des sols injectés par analyse inverse d'essais pressiométriques

Dano

Hicher

Tailliez³

et al. 2002

Revue Française de Génie Civil

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A non‐destructive method of determining rock strength

Cited by 35 publications

References 11 publications

The effects of fire on rock weathering: some further considerations of laboratory experimental simulation

The effects of fire on rock weathering: some further considerations of laboratory experimental simulation

Elastic Parameters of Intermediate Soils Based on Bender-Extender Elements Pulse Tests

Identification des paramètres de comportement des sols injectés par analyse inverse d'essais pressiométriques

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