Research on Creep Deformation Characteristics of Multiple Weak Layer Slopes under Mining
To study the creep deformation of an open-pit mine slope with multiple weak interlayers before and after mining,FLAC3D numerical simulation software is employed.Based on the Cvisc creep constitutive model,which can describe the elastoplastic shear characteristics and elastoplastic volumetric behavior of geotechnical materials,the creep deformation patterns of the current multiple weak layer slopes of open-pit mines subjected to mining disturbances are investigated.The results indicate that before mining,due to the influence of the overlying slope mass's weight on the weak strata,the upper slope mass undergoes uniform creep deformation towards the free face along the weak strata,with small-scale tensile-shear failure occurring at the weak strata,maintaining overall slope stability.After mining disturbances,stress redistribution causes deformation of the weak strata within the slope,and plastic zones appear in the anticline areas where weak layers concentrate and at the weak layers of the coal seam roof,forming new potential sliding bodies.As mining progresses and creep deformation continues,these plastic zones connect,making the overall slope prone to instability and failure under self-weight stress and external forces.
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