采动底板层状岩体应力分布规律及破坏深度研究

doi:10.13722/j.cnki.jrme.2014.10.009

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Abstract The proper estimation of failure depths of mining floors is an important issue during mining above a confined aquifer. The layered rock mass of the floor is regarded as a transverse isotropic and continuous body. An analytical solution of the stresses in the transverse isotropic floor was derived considering the load distribution of seam overburden under the mining condition. The influence of the anisotropy(E1/E2，?1/?2) of deformation parameters of the transverse isotropic floor on the stress distribution was analysed. The dangerous shear plane of the transverse isotropic rock mass is found by the method of trial searching according to the calculated stress results and the Mohr-Coulomb yield criterion. The dangerous shear plane is then judged to be failure or not. The anisotropy of the elastic modulus is found to have a big effect on all kinds of stress distributions of the mining floor. The influence of the anisotropy of Poisson?s ratio on the vertical stress and shear stress is very small，but very significant on the horizontal stress. The calculated maximum failure depth and its location on the transverse isotropic floor are basically consistent with the results from the in-situ injection test due to considering the anisotropy of deformation and strength of layered rock mass.

Key words： mining engineering transverse isotropy layered rock mass mining floor failure depth

Received: 21 October 2013

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.10.009 OR http://www.rockmech.org/EN/Y2014/V33/I10/2030

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