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Failure mechanism andcoupledstatic-dynamicloading theory indeep hard rockmining: A review Xibing LiFengqiang GongMing Tao2017 год

Failure mechanism and coupled static-dynamic loading theory in deep hard rock mining: A review

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Аннотация: Rock failure phenomena, such as rockburst, slabbing (or spalling) and zonal disintegration, related to deep underground excavation of hard rocks are frequently reported and pose a great threat to deep mining. Currently, the explanation for these failure phenomena using existing dynamic or static rock mechanics theory is not straightforward. In this study, new theory and testing method for deep underground rock mass under coupled static-dynamic loading are introduced. Two types of coupled loading modes, i.e. “critical static stress + slight disturbance” and “elastic static stress + impact disturbance”, are proposed, and associated test devices are developed. Rockburst phenomena of hard rocks under coupled static-dynamic loading are successfully reproduced in the laboratory, and the rockburst mechanism and related criteria are demonstrated. The results of true triaxial unloading compression tests on granite and red sandstone indicate that the unloading can induce slabbing when the confining pressure exceeds a certain threshold, and the slabbing failure strength is lower than the shear failure strength according to the conventional Mohr-Column criterion. Numerical results indicate that the rock unloading failure response under different in situ stresses and unloading rates can be characterized by an equivalent strain energy density. In addition, we present a new microseismic source location method without premeasuring the sound wave velocity in rock mass, which can efficiently and accurately locate the rock failure in hard rock mines. Also, a new idea for deep hard rock mining using a non-explosive continuous mining method is briefly introduced.
Год издания: 2017
Авторы: Xibing Li, Fengqiang Gong, Ming Tao, Longjun Dong, Kun Du, Chunde Ma, Zilong Zhou, Tubing Yin
Издательство: Elsevier BV
Источник: Journal of Rock Mechanics and Geotechnical Engineering
Ключевые слова: Rock Mechanics and Modeling, Landslides and related hazards, Geotechnical and Geomechanical Engineering
Другие ссылки: Journal of Rock Mechanics and Geotechnical Engineering (HTML)
DOAJ (DOAJ: Directory of Open Access Journals) (HTML)