Numerical Simulation of Dynamic Response of Surrounding Rock Anchored by NPR Bolt/Cable

doi:10.12068/j.issn.1005-3026.2022.08.013

Abstract

Abstract: In this paper， a coal mine is used as the research region to study the problems caused by deep mining， such as rock burst， large deformation and failure of conventional bolt/cable. Based on the large deformation failure mechanism of high in-situ stress soft rock， the FLAC3D-PFC3D coupling modeling method was used to carry out the dynamic numerical simulation study of NPR (negative Poisson’s ratio) bolt/cable for the first time. Numerical models of two support schemes of PR and NPR bolt/cable were established， and the stress and displacement of the surrounding rock of the chamber and the bolt/cable under dynamic loads were compared and analyzed. The results show that under the impact load of 25MPa， 21 of the 25 PR support bolts/cables failed， the surrounding rock was damaged in a large area， the coupling wall was severely deformed， and the chamber presented inner convex arc-shaped deformation and failure. Under the same conditions， none of the NPR bolts/cables failed， and the stability of the surrounding rock of the chamber remained good.

Key words: rock burst; NPR bolt/cable; surrounding rock support; FLAC3D; chamber stability

CLC Number:

TU45

GUO Long-ji， HE Man-chao， QU Ding-jun， TAO Zhi-gang. Numerical Simulation of Dynamic Response of Surrounding Rock Anchored by NPR Bolt/Cable[J]. Journal of Northeastern University(Natural Science), 2022, 43(8): 1159-1167.

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