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Using true‑triaxial stress path to simulate excavation‑induced rock damage:a case study

International Journal of Coal Science & Technology 2022年第4期9卷 165-180页

作者： Qingsheng Bai Cun Zhang R.Paul Young State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Geotechnical Institute TU Bergakademie FreibergGustav-Zeuner-Straße 109599 FreibergGermany School of Resource and Safety Engineering China University of Mining and Technology(Beijing)BeijingChina Department of Civil and Mineral Engineering University of TorontoTorontoCanada

This study presents an example illustrating the role of in situ 3D stress path method in simulating the roof damage development observed in the Mine-by tunnel at Underground Research Laboratory(URL)located in Manitoba,*** 3D stress path,at the point 1 cm in the crown of the Mine-by tunnel,was applied to a cubic Lac du Bonnet(LdB)granite sample to further understand the roof damage process and the associated *** careful calibrations,a numerical model was used to reproduce the experiment,which produced similar seismicity processes and source *** emission(AE)events obtained from laboratory and numerical modeling were converted to locations in relation to the tunnel face and were compared to the feld microseismicity(MS)occurring in the upper notch region of the Mine-by *** crack development and damage mechanism are carefully *** diference between tests and feld monitoring was *** intermediate principal stress(σ_(2))unloading process was carried out in numerical simulation to investigate its role in rock damage *** results clearly showedσ_(2)could play a signifcant role both in damage development and failure *** should be considered when predicting the damage region in underground *** study highlights the potential role of laboratory and numerical stress path tests to investigate fracture processes and mechanisms occurring during engineering activities such as tunnel excavation.

关键词： Acoustic emission Damage development In situ 3D stress path Numerical simulation true-triaxial experiment

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