Elastoplastic model for discontinuous shear deformation of deep rock mass

Abstract

Deep rock mass possesses some unusual properties due to high earth stress, which further result in new problems that have not been well understood and explained up to date. In order to investigate the deformation mechanism, the complete deformation process of deep rock mass, with a great emphasis on local shear deformation stage, was analyzed in detail. The quasi continuous shear deformation of the deep rock mass is described by a combination of smooth functions: the averaged distribution of the original deformation field, and the local discontinuities along the slip lines. Hence, an elasto-plastic model is established for the shear deformation process, in which the rotational displacement is taken into account as well as the translational component. Numerical analysis method was developed for case study. Deformation process of a tunnel under high earth stress was investigated for verification.

Model Test of Anchoring Effect on Zonal Disintegration in Deep Surrounding Rock Masses

“…Other studies on zonal disintegration have applied different techniques such as a series of compression tests Pan [11, 12], nonequilibrium thermodynamics (Metlov et al) [13], Hamiltonian time-domain variation (Li et al) [14], and the non-Euclidean model (Guzev and Paroshin) [15]. In addition, some elastic-plastic theories have been adopted to analyze the forming mechanism of zonal disintegration (Wang et al [16, 17]; He et al, [18]; Zhou et al [19–24]; Reva and Tropp, [25]; Tan et al, [26]; Wu et al, [27]; Odintsev, [28]). A zonal disintegration phenomenon is shown in Figure 1.…”