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Physical model test on the support characteristic for quasi-NPR bolt under asymmetric stress

Underground Space 2023年第4期11卷 46-62页

作者： Wei Ming Xiaojie Yang Yadong Mao Xiang Wang Manchao He Zhigang Tao State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

With the continuous increase in tunnel construction,the significant deformation of the surrounding tunnel rock is often difficult to predict and *** addition,the lithology,structure,and various asymmetric large deformation of surrounding rock mass during operation and maintenance severely affect the ultimate bearing and stability of the *** explore the deformation mechanisms and failure modes of surrounding rock under large asymmetric stress and complex geological conditions,a physical model of a tunnel through granite was constructed based on the similarity *** model had 30°dip lithology under asymmetric stress and was emplaced a new quasi-negative Poisson’s ratio(NPR)*** analyzing the variation law of displacement and axial force of the bolt under an asymmetric load,the asymmetric deformation and failure mechanism of the granite tunnel and the support effect of the quasi-NPR bolt were *** energy absorbed by the surrounding rock was analyzed,and the influence mechanism and control countermeasures of asymmetric stress on the granite tunnel were *** work provides a reference for the design of asymmetric support of tunnels with similar engineering backgrounds.

关键词： Asymmetric stress Physical model test Quasi-NPR bolt support characteristic

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