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

Zhi Zheng ¹Bin Deng ²Hong Liu ²Wei Wang ³Shuling Huang ⁴Shaojun Li⁵

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作者信息

1. 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
2. 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
3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China
4. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430015,China
5. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China
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Abstract

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.

Key words

True triaxial disturbance test/Mechanical properties/Fracture evolution mechanism/Disturbance-induced damage evolution/Failure mechanism and precursor

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基金项目

国家自然科学基金(52109119)

广西自然科学基金(2021GXNSFBA075030)

Guangxi Science and Technology Project(Guike AD20325002)

Chinese Postdoctoral Science Fund Project(2022M723408)

Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin(China Institute of Wat(IWHR-SKL-202202)

出版年

2024

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)

CSTPCDCSCDEI

影响因子：1.222

ISSN：2095-2686

参考文献量9

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