Coal resources have always been the focus of attention in field sustainable development. Based on problem surrounding rock control close-distance coal seams, first, a mechanical model floor failure was established based 29204 working face Dongqu Mine; mechanism revealed by zero displacement line, and method to judge occurrence state roof lower seam put forward. Furthermore, FLAC3D numerical sim...

A dynamic numerical method is established to simulate the stability of surrounding rocks retained roadway in FLAC3D, along with a double-yield constitutive model re-compaction process gangue and strain-softening characteristic coal grouted fragmented after yielding. The simulation reveals that grouting slurry diffusion range, mining affecting stage behind working face rib deformation are closel...

In order to explore the dynamic evolution of overburden rock movement and mining-induced stress an ultra-high working face, taking face a 2# thick coal seam in shallow mine field as engineering background, this paper analyzes distribution characteristics principal stress, mining characteristics, migration caving under different advancing distances calculates by FLAC3D numerical simulation softw...

The stacking of impermissible materials in the disposal dry fly ash is unprecedented last 40 years power plant management China, and their effect on stability whole facility uncertain. Due to lack relevant treatment experience, a more comprehensive method such as numerical modeling must be adopted for final design. This paper set up borehole database from geological logging data obtain distribu...

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...