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Dynamic properties of micro-NPR material and its controlling effect on surrounding rock mass with impact disturbances

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Underground Space 2024年第2期15卷 331-352页

作者： Manchao He Jie Hu Tai Cheng Fei Deng Zhigang Tao Hongru Li Di Peng Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining&TechnologyBeijing 100083China Luohe Vocational Technology College Henan 462002China

A novel meta steel with negative Poisson’s ratio effect(termed as micro-NPR steel)is developed for rock support in deep underground *** possesses high strength,high ductility,and high energy absorption *** this paper,static tension and modified dynamic drop hammer tests are performed on this novel material to investigate its mechanical properties *** based on this material,a new generation of micro-NPR anchor cable is developed and applied in field tests subjected to blasting dynamic *** results of laboratory tests reveal that the ultimate elongation of micro-NPR steel under dynamic impacts is more than 30%and it is over 1.5 times that of Q235;the plastic and total energy absorption of micro-NPR are both significantly higher than that of *** test indicates the fine controlling effect of micro-NPR anchor cable on surrounding rock mass under dynamic *** force confirms that micro-NPR cables can distribute and absorb the dynamic energy uniformly around the supported rock when subjected to dynamic disturbance,avoiding local failure induced by excessive stress *** excavation compensation principle and energy-absorbing characteristics are used to explain the support ***,micro-NPR material and anchor cable can control and prevent dynamic disasters in deep underground engineering effectively.

关键词： Micro-NPR steel Energy-absorbing drop hammer test Anchor cable Field test

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