High Temperature Versus Geomechanical Parameters of Selected Rocks – The Present State of Research

Sygała, Anna; Bukowska, M.; Janoszek, Tomasz

doi:10.7424/jsm130407

Cited by 52 publications

(24 citation statements)

References 8 publications

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“…In a similar manner to strength, the elastic response of rock depends mainly on the elastic properties of the constituent minerals, the degree of cementation and porosity (Sygała et al 2013). Under the influence of high temperatures, another important factor that affects rock strength and elastic response is the thermal expansion of the constituent minerals.…”

Section: Micro-ct Resultsmentioning

confidence: 99%

Effect of high temperatures on sandstone – a computed tomography scan study

Yang

Marshall

Wanatowski

et al. 2017

International Journal of Physical Modelling in Geotechnics

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© ICE Publishing, all rights reserved. This is an author produced version of a paper published in International Journal of Physical Modelling in Geotechnics. Uploaded in accordance with the publisher's self-archiving policy.eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Effect of high temperatures on sandstone -a computed tomography scan study The impact of high temperatures on rocks is a topic of growing importance in geotechnical engineering because of its relevance to applications such as underground nuclear fuel storage, geothermal energy resource exploration, and underground coal gasification (UCG). This paper presents results from tests performed on samples of sandstone treated to a range of temperatures between 20 and 1000°C. Sandstone samples obtained from underground coal gasification (UCG) trial sites in Poland were selected for the tests. Multistage triaxial tests were used to determine the mechanical properties of the samples.X-ray diffraction (XRD) and thermal analyses (TA) were performed to investigate the changes in the physical and chemical properties of the samples under increasing temperature. Micro-computed gomography analyses were carried out on selected samples in order to reveal the microstructural changes that take place as a result of the heating process. 3D characterization of the sample porosity and pore size distribution were performed to obtain a quantitative comparison between samples subjected to different temperature treatments. The relationship between micro-structure and macro-mechanical characteristics of sandstone at high temperature is discussed. The results illustrate that the mechanical properties of sandstone are closely related to alterations of microstructure that result from increased temperatures. IntroductionThe effect of high temperature on the thermo-mechanical response of rocks is important for several engineering applications, including underground nuclear waste storage, geothermal energy resource exploration, and underground coal gasification (UCG). Generally, the scope of high temperature ranges from normal temperatures (10-50 ¡C) to extreme temperatures (1000-1500 ¡C). Under the influence of high temperatures, the mechanical properties o...

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Section: Micro-ct Resultsmentioning

confidence: 99%

Effect of high temperatures on sandstone – a computed tomography scan study

Yang

Marshall

Wanatowski

et al. 2017

International Journal of Physical Modelling in Geotechnics

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“…() and Sygala et al. () showed that at 600–1200 °C, depending on rock type, Young's moduli drop to 10–66% of their surface value. We therefore calculated thermal stresses using Young's moduli covering the range between 15 and 60 GPa.…”

Section: Emplacement Mechanisms For Qd and Miqd Dykesmentioning

confidence: 97%

Multiphase emplacement of impact melt sheet into the footwall: Offset dykes of the Sudbury Igneous Complex, Canada

Prevec

Büttner

2018

Meteorit & Planetary Scien

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The offset dykes of the Sudbury Igneous Complex comprise two distinct main magmatic facies, a high‐temperature inclusion‐free quartz diorite (QD), and a subsequently intruded lower temperature, mineralized, and inclusion‐rich quartz diorite (MIQD). The MIQD facies was emplaced after QD dykes had solidified. Key controlling factors of the two injection phases were (1) the development of a coherent roof, which confined the melt sheet; and (2) the periodic increase of melt and fluid pressure within the melt sheet. For the injection of QD melt, the melt pressure exceeded the normal stress acting on fracture surfaces. For the later refracturing of QD dykes and the injection of MIQD melt, the melt pressure increased further, exceeding the tensile strength of, and the normal stress acting on, QD dykes. We associate the melt pressure increase required for both injection episodes with degassing and devolatilization of cooling melt close to the roof. Within the hydraulically connected melt column, the related pressure increase was transmitted to the base of the melt sheet where QD and MIQD melt was extracted into dykes. Residual core to rim thermal gradients in the QD dykes produced tensile strength gradients, accounting for the typically central location of MIQD dykes within QD dykes.

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“…Temperature is one factor that can alter the physical properties in rock. As temperature increases, thermal expansion of rockforming minerals weakens the rock mass and may cause its destruction (Dimitriyev et al 1969;Heuze 1983;Somerton 1992;Den'gina et al 1994;Hajpál and Török 2004;Sygała et al 2013;Cieślik 2015). Changes in physical rock properties under high temperatures may have a practical impact on in situ mining deposits, as well as creating issues for mine safety.…”

Section: Introductionmentioning

confidence: 99%

“…However, datasets are wide-ranging, and it is difficult to characterize uniformly the behavior of rocks under high Editorial handling: Pinnaduwa Kulatilake temperatures. The thermal influence on the behavior of rocks is closely dependent on the heating conditions, rock type, mineralogy, distribution of microfissures and primary cracks, density, porosity, and many other factors (Chaki et al 2008;Keshavarz et al 2010;Sygała et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Identification of temperature effect on post-critical geomechanical properties of loaded sandstones

Sygała

Bukowska

2019

Arab J Geosci

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Geomechanical changes in the post-critical residual strength and strain of Carboniferous sandstones from the Upper Silesian Coal Basin, Poland, were measured from uniaxial compression tests. Rock samples were subjected to high temperatures of up to 1200°C. Sandstone samples of different grain sizes were collected from all currently exploited lithostratigraphic members of coal-bearing Carboniferous sandstones across the Upper Silesian Coal Basin, including the Upper Silesian Sandstone Series (Ruda Beds and Saddle Beds). The samples were heated to temperatures between 100 and 1200°C, cooled to room temperature, and subsequently tested by uniaxial compression in a servo-controlled testing machine MTS-810 NEW. The analysis of results followed a grain size and room temperature uniaxial compressive strength classification scheme. Normalized indices of the thermal influence on residual strength and residual strain were calculated. The new measure, namely the indices of thermal influence, can be used to predict the stability of rock masses subjected to high temperatures. The conducted research in terms of evaluation of post-critical parameters subjected to high temperatures as well as the method of analyzing the results are novel and are of primary importance from the engineering (mining and geoengineering) applications point of view.

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High Temperature Versus Geomechanical Parameters of Selected Rocks – The Present State of Research

Cited by 52 publications

References 8 publications

Effect of high temperatures on sandstone – a computed tomography scan study

Effect of high temperatures on sandstone – a computed tomography scan study

Multiphase emplacement of impact melt sheet into the footwall: Offset dykes of the Sudbury Igneous Complex, Canada

Identification of temperature effect on post-critical geomechanical properties of loaded sandstones

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