Modeling of the Influence of Pore Size and Porosity on Strength Characteristics of Volcanic Rock

doi:10.12068/j.issn.1005-3026.2017.05.024

Journal of Northeastern University:Natural Science ›› 2017, Vol. 38 ›› Issue (5): 725-729.DOI: 10.12068/j.issn.1005-3026.2017.05.024

• Resources & Civil Engineering • Previous Articles Next Articles

Modeling of the Influence of Pore Size and Porosity on Strength Characteristics of Volcanic Rock

CHEN Chong-feng^1,2， XU Tao^1,2， HEAP Michael ³， YANG Tian-hong^1,2

1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines， Northeastern University， Shenyang 110819， China; 3. Laboratoire de Déformation des Roches， équipe de Géophysique Expérimentale， Institut de Physique de Globe de Strasbourg， 5 rue René Descartes， 67084 Strasbourg cedex， France.

Received:2015-12-18 Revised:2015-12-18 Online:2017-05-15 Published:2017-05-11
Contact: XU Tao
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Abstract

Abstract:

Based on the study of the pore structure of volcanic rock， the uniaxial compression process of volcanic rock was numerically performed to investigate the influence of pore size and porosity on strength characteristics of volcanic rock using rock failure process analysis system (RFPA2D). The results show that under the pore size increasing from 0.1 to 0.3 mm， reduction percentage of ultimate strain with the increase of porosity keeps fluctuation within a certain range， elastic modulus’ reduction percentage increase with the increase of porosity and shows a linear increasing trend. Under the same porosity， the influence of pore size mainly shows that， with the increasing of the pore size， failure mode of the samples gradually tends to split fracture.

Key words: pore size, porosity, strength properties, failure mode, numerical simulation

CLC Number:

TU521.2⁺1

CHEN Chong-feng， XU Tao， HEAP Michael,YANG Tian-hong. Modeling of the Influence of Pore Size and Porosity on Strength Characteristics of Volcanic Rock[J]. Journal of Northeastern University:Natural Science, 2017, 38(5): 725-729.

References

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Modeling of the Influence of Pore Size and Porosity on Strength Characteristics of Volcanic Rock

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