The influence on tunnel construction of karst and underground rivers is always an important problem in engineering. In order to demonstrate the rationality backfill parameters effectiveness supports under groundwater when a passes through large cave, finite element software FLAC3D was used for numerical analysis. Converting mean values standard deviations mechanical response results surrounding...

The process of roadway surrounding rock deformation and instability is always accompanied by energy changes, the transformation directly drives its failure. In order to realize stability control mining roadway, distribution elastic strain plastic was analyzed using FLAC3D numerical simulation software on basis law sandstone under different confining pressures revealed indoor triaxial compressio...

Underground excavation is a necessary process for constructing mines, tunnels and depots in granite rock mass. In this study, the numerical specimens were established by discrete element method confirmed laboratory experiments order to investigate peak stress, cracking development failure properties of pre-holed under coupled biaxial loading unloading conditions. The results show that, containi...

To investigate and analyze the influence of different stress environments on deformation destabilization rocks surrounding laminated roadways under high stress, this study conducted numerical simulations coal–rock combination circumferential pressures highly stressed lateral pressure coefficients. In addition, a new custom constitutive structure model was constructed based Mohr–Coulomb criterio...

The relationship between textural properties of selected Nigeria rocks and penetration rate of top-hole hammer drill was investigated. These rock samples were tested in the laboratory for mineral composition, silica content and porosity. Also, average grain size and packing density were determined from photomicrograph of the samples using empirical equations proposed by researchers. Penetration...