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Erschienen in: Rock Mechanics and Rock Engineering 9/2016

15.06.2016 | Original Paper

Effect of High Temperature on Mineralogy, Microstructure, Shear Stiffness and Tensile Strength of Two Australian Mudstones

verfasst von: Xianfeng Liu, Chonglei Zhang, Shengyang Yuan, Stephen Fityus, Scott William Sloan, Olivier Buzzi

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 9/2016

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Abstract

This study aims at providing quality experimental data on the effects of temperature on tensile strength and small strain shear stiffness of two Australian mudstones. The objective is to provide multiscale data in view of developing a numerical model that can capture and simulate the complex multiphysics of underground coal fire propagation. Two mudstones were collected in the Hunter Valley, close to a known underground coal fire, referred to as “Burning Mountain.” The rock specimens were heated to a range of temperatures (maximum of 900 °C) for 24 h, and the materials were comprehensively characterized by X-ray diffraction, thermal gravimetric analyses, optical microscopy and scanning electron microscopy. In addition, mercury intrusion porosimetry was used in order to track changes in pore size distribution with temperature. Investigations at microscale were complemented by testing at the macroscale. In particular, the paper focuses on the evolution of the tensile strength and small strain shear stiffness as the materials are subjected to heating treatment. Results show that both parameters evolve in a non-monotonic manner with temperature. The observed mechanical responses are fully explained and corroborated by microstructural observations.

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Metadaten
Titel
Effect of High Temperature on Mineralogy, Microstructure, Shear Stiffness and Tensile Strength of Two Australian Mudstones
verfasst von
Xianfeng Liu
Chonglei Zhang
Shengyang Yuan
Stephen Fityus
Scott William Sloan
Olivier Buzzi
Publikationsdatum
15.06.2016
Verlag
Springer Vienna
Erschienen in
Rock Mechanics and Rock Engineering / Ausgabe 9/2016
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI
https://doi.org/10.1007/s00603-016-1024-y

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