Title of Paper:Numerical analysis of tunnel reinforcing influences on failure process of surrounding rock under explosive stress waves

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Date of Publication:2008-10-01

Journal:JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:15

Issue:5

Page Number:632-638

ISSN No.:1005-9784

Key Words:tunnel reinforcing; numerical simulation; explosive stress wave; failure process; inhomogeneity

Abstract:Based on mesoscopic damage mechanics, numerical code RFPA(2D) (dynamic edition) was developed to analyze the influence of tunnel reinforcing on failure process of surrounding rock under explosive stress waves. The results show that the propagation phenomenon of stress wave in the surrounding rock of tunnel and the failure process of surrounding rock under explosive stress waves are reproduced realistically by using numerical code RFPA(2D); from the failure process of surrounding rock, the place at which surrounding rock fractures is transferred because of tunnel reinforcing, and the rockfall and collapse caused by failure of surrounding rock are restrained by tunnel reinforcing; furthermore, the absolute values of peak values of major principal stress, and the minimal principal stress and shear stress at center point of tunnel roof are reduced because of tunnel reinforcing, and the displacement at center point of tunnel roof is reduced as well, consequently the stability of tunnel increases.