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<p>The anisotropic behaviour of jointed soft rocks subjected to cyclic loading corresponding to small earthquake events and the affecting parameters is not studied extensively. In the present study, the anisotropic strength response of jointed soft rocks under cyclic loading is investigated under varying pre-heating temperatures (i.e., 30&#xa0;°C–300&#xa0;°C), specimen porosities (i.e., at 60% w and 80% w) and infill conditions (i.e., cement and bio-concrete mix). The jointed specimens have prepared using Plaster of Paris (PoP) material with a flaw intersected at various inclinations with horizontal in the middle. Further, the joint along specimens is filled with different grouting materials, i.e., cement and sand-cement mortar with the bio-concrete mix, to examine their efficacy in improving this response of specimens. The specimens are tested under dynamic loading conditions using the cyclic test machine at stress control fatigue. The experiments are coupled with high-speed camera to perform Digital Image Correlation (DIC) analyses of specimens to investigate the underlying fracturing mechanisms along specimens. The strength behaviour is represented in terms of number of stress cycles sustained by the specimens. The jointed specimens exhibit the anisotropy in their cyclic response (or, number of cycles), with minimum strength observed for the flaw orientation of 30° due to co-incidence of flaw with the fracture. The presence of grouts has inhibited the anisotropic response of specimens possibly due to the convergence of their behaviour towards intact specimens. Similarly, the anisotropic response of specimens in general reduced with the increasing pre-treatment temperature due to the dominance of thermal cracks in the fracturing of specimens. The fracturing along the specimens is dependent upon the prevailing experimental conditions. The fractures have been observed to be initiating from flaw tips, except for some grouted specimens, propagated mostly parallel to the loading direction under room temperature conditions. The fracturing has been observed to be more dispersed for the pre-heated specimens due to the presence of thermal cracks.</p>

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Dynamic Response of Grouted Jointed Rock Mass to Cyclic Loading Under Extreme Temperature Conditions

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Gaurav Kumar Mathur,
  • Arvind Kumar Jha,
  • Gaurav Tiwari,
  • T. N. Singh

摘要

The anisotropic behaviour of jointed soft rocks subjected to cyclic loading corresponding to small earthquake events and the affecting parameters is not studied extensively. In the present study, the anisotropic strength response of jointed soft rocks under cyclic loading is investigated under varying pre-heating temperatures (i.e., 30 °C–300 °C), specimen porosities (i.e., at 60% w and 80% w) and infill conditions (i.e., cement and bio-concrete mix). The jointed specimens have prepared using Plaster of Paris (PoP) material with a flaw intersected at various inclinations with horizontal in the middle. Further, the joint along specimens is filled with different grouting materials, i.e., cement and sand-cement mortar with the bio-concrete mix, to examine their efficacy in improving this response of specimens. The specimens are tested under dynamic loading conditions using the cyclic test machine at stress control fatigue. The experiments are coupled with high-speed camera to perform Digital Image Correlation (DIC) analyses of specimens to investigate the underlying fracturing mechanisms along specimens. The strength behaviour is represented in terms of number of stress cycles sustained by the specimens. The jointed specimens exhibit the anisotropy in their cyclic response (or, number of cycles), with minimum strength observed for the flaw orientation of 30° due to co-incidence of flaw with the fracture. The presence of grouts has inhibited the anisotropic response of specimens possibly due to the convergence of their behaviour towards intact specimens. Similarly, the anisotropic response of specimens in general reduced with the increasing pre-treatment temperature due to the dominance of thermal cracks in the fracturing of specimens. The fracturing along the specimens is dependent upon the prevailing experimental conditions. The fractures have been observed to be initiating from flaw tips, except for some grouted specimens, propagated mostly parallel to the loading direction under room temperature conditions. The fracturing has been observed to be more dispersed for the pre-heated specimens due to the presence of thermal cracks.