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Enhanced Hoek-Brown(H-B)criterion for rocks exposed to chemical corrosion

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Underground constructions often encounter water environments,where water-rock interaction can increase porosity,thereby weakening engineering rocks.Correspondingly,the failure criterion for chem-ically corroded rocks becomes essential in the stability analysis and design of such structures.This study enhances the applicability of the Hoek-Brown(H-B)criterion for engineering structures operating in chemically corrosive conditions by introducing a kinetic porosity-dependent instantaneous mi(KPIM).A multiscale experimental investigation,including nuclear magnetic resonance(NMR),X-ray diffraction(XRD),scanning electron microscopy(SEM),pH and ion chromatography analysis,and triaxial compres-sion tests,is employed to quantify pore structural changes and their linkage with the strength responses of limestone under coupled chemical-mechanical(C-M)conditions.By employing ion chromatography and NMR analysis,along with incorporating the principles of free-face dissolution theory accounting for both congruent and incongruent dissolution,a kinetic chemical corrosion model is developed.This model aims to calculate the kinetic porosity alterations within rocks exposed to varying H+concentra-tions and durations.Subsequently,utilizing the generalized mixture rule(GMR),the kinetic porosity-dependent mi is formulated.Evaluation of the KPIM-enhanced H-B criterion using compression test data from 5 types of rocks demonstrated a high level of consistency between the criterion and the experimen-tal results,with a coefficient of determination greater than 0.96,a mean absolute percentage error less than 4.84％,and a root-mean-square deviation less than 5.95 MPa.Finally,the physical significance of the porosity-dependent instantaneous mi is clarified:it serves as an indicator of a rock's capacity to lever-age the confining pressure effect.

Hoek-Brown(H-B)criterionInstantaneous miKinetic porosity-dependencyChemical corrosionCompressive strength

Hao Li、Leo Pel、Zhenjiang You、David Smeulders

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Department of Mechanical Engineering,Eindhoven University of Technology,Eindhoven 5600 MB,the Netherlands

Department of Applied Physics,Eindhoven University of Technology,Eindhoven 5600 MB,the Netherlands

Center for Sustainable Energy and Resources,School of Engineering,Edith Cowan University,Joondalup,WA 6027,Australia

School of Chemical Engineering,The University of Queensland,Brisbane,QLD 4072,Australia

Gas and Energy Transition Research Centre,The University of Queensland,Brisbane,QLD 4072,Australia

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2024

10.1016/j.ijmst.2024.05.002

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2024.34(5)
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