首页|Microdynamic mechanical properties and fracture evolution mechanism of monzogabbro with a true triaxial multilevel disturbance method

Microdynamic mechanical properties and fracture evolution mechanism of monzogabbro with a true triaxial multilevel disturbance method

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The far-field microdynamic disturbance caused by the excavation of deep mineral resources and under-ground engineering can induce surrounding rock damage in high-stress conditions and even lead to dis-asters.However,the mechanical properties and damage/fracture evolution mechanisms of deep rock induced by microdynamic disturbance under three-dimensional stress states are unclear.Therefore,a true triaxial multilevel disturbance test method is proposed,which can completely simulate natural geos-tress,excavation stress redistribution(such as stress unloading,concentration and rotation),and subse-quently the microdynamic disturbance triggering damaged rock failure.Based on a dynamic true triaxial test platform,true triaxial microdynamic disturbance tests under different frequency and amplitudes were carried out on monzogabbro.The results show that increasing amplitude or decreasing frequency diminishes the failure strength of monzogabbro.Deformation modulus gradually decreases during dis-turbance failure.As frequency and amplitude increase,the degradation rate of deformation modulus decreases slightly,disturbance dissipated energy increases significantly,and disturbance deformation anisotropy strengthens obviously.A damage model has been proposed to quantitatively characterize the disturbance-induced damage evolution at different frequency and amplitude under true triaxial stress.Before disturbance failure,the micro-tensile crack mechanism is dominant,and the micro-shear crack mechanism increases significantly at failure.With the increase of amplitude and frequency,the micro-shear crack mechanism increases.When approaching disturbance failure,the acoustic emission fractal dimension changes from a stable value to local large oscillation,and finally increases sharply to a high value at failure.Finally,the disturbance-induced failure mechanism of surrounding rock in deep engineering is clearly elucidated.

True triaxial disturbance testMechanical propertiesFracture evolution mechanismDisturbance-induced damage evolutionFailure mechanism and precursor

Zhi Zheng、Bin Deng、Hong Liu、Wei Wang、Shuling Huang、Shaojun Li

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State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai Unive

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China

Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430015,China

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国家自然科学基金广西自然科学基金Guangxi Science and Technology ProjectChinese Postdoctoral Science Fund ProjectOpen Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin(China Institute of Wat

521091192021GXNSFBA075030Guike AD203250022022M723408IWHR-SKL-202202

2024

10.1016/j.ijmst.2024.01.001

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(3)
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