Strengthening the base-angle of a roadway can have beneficial impact on its overall stability, but specific optimal parameter selection range is still unclear. Fast Lagrangian Analysis Continua 3D (FLAC3D) software used to carry out stability analysis 5 kinds models with different section shapes under conditions no support and bolt angles, simulation verification carried actual working Sanshand...

Fracturing roofs to maintain entry (FRME) is a novel longwall mining method, which has been widely used in China, leading new revolution. In order research the change law of side abutment pressure and movement overlying strata when using FRME, monitoring device, namely, flexible detection unit (FDU), developed applied field. The results show that compared with head (also called non-splitting en...

Coal seam permeability is one of the key factors influencing gas extraction efficiency, which great significance to reduce coal and dynamic disasters in gassy mines. Hydraulic slotting technique an effective method stimulate reservoir, but selection parameters has impact on efficiency. For this reason, hydraulic model was established by using FLAC3D software analyze stress distribution before a...

The instability of extraction structure under the undercut space in block caving stope presents specific characteristics: rib spalling and floor heave ore-loading roadway collapse major apexes. In order to study stress displacement evolution law reveal mechanism structure, numerical simulation model was established using finite difference software FLAC3D. According postundercutting strategy Ton...

Compared with that of equal-length working faces, the mechanical evolution mechanism overburden rocks in “knife handle”-type mining sites is more complex. The form roof fracture knife handle-type mines variable, and stress distribution near interface concentrated, thereby severely threatening safety mining. To elucidate characteristics fully mechanized top-coal caving sites, geological conditio...

Due to the influence of ground stress, mining disturbance, and other factors, roadway surrounding rock in deep underground engineering such as mines, tunnels, caverns is prone looseness deformation with excavation roadways. In engineering, bolt support frequently employed stabilize rock. this work, a part anchor were taken simplified model anchorage mass, laboratory compression test was perform...

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...

The left bank of the cushion pond Baihetan hydropower station is a slant and dip slope. gently inclined intra-layer fault zones, steep-dip faults unloading fissures cutting slope to form several potentially unstable blocks. computational results show that stabilities blocks are controlled by zones. A method treatment applying deep replacement caverns load-reduction excavation was proposed reinf...