Analysis of progressive rupture process in surrounding rock for a deep homogeneous and circular opening

doi:10.16265/j.cnki.issn1003-3033.2018.10.020

Abstract

Abstract: In order to study the influence of the failure mode and failure scope of surrounding rock rupture zone on the stability of the roadway. Mohr-Coulomb (M-C) yield criteria is used to study the general pattern of rupture progress in the surrounding rock of circular openings on the basis of circular hole analytic solution of stress in elasto-plastic mechanics. The concept of the sub-rupture zone in surrounding rock is proposed,the criterion for rupture of sub-rupture zone is derived, the calculation formula of the radial stress of the outer boundary in the sub-rupture zone and the calculation method of radii in the sub-rupture zone are obtained.The equality of radii of adjacent sub-rupture zones is taken as the criterion of cessation of rupturing in a rupture zone, and is the criterion upon which the solving equations of maximum radius and maximum radial stress are deduced based. The theoretical calculation is verified by the FLAC^3D numerical simulation. The results show that: the ruptureprocess in surrounding rock of homogeneous and circular openings is a dynamic process of gradual development in the mode of annuli under condition of hydrostatic pressure, the theoretical calculation coincides with the radius of the fracture zone obtained by numerical simulation, the results can provide a theoretical basis for the optimal support design of underground engineering.

Key words: circular opening, progressive rupture, sub-rupture zone, rupture zone radius, iterative computation

CLC Number:

X936

WANG Dong, JIANG Juyu, HAN Xinping. Analysis of progressive rupture process in surrounding rock for a deep homogeneous and circular opening[J]. China Safety Science Journal, 2018, 28(10): 118-123.

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