Rockburst disasters frequently occur in deep tunnels excavated by TBM (tunnel boring machine) under complex geological conditions western China. Using FLAC3D, the characterization of a three-dimensional numerical model compound stratum tunnel is conducted, based on water transport project Shanxi Province. Then, characteristics rockburst hard and soft are revealed, energy criteria considering ro...

Vacuum–surcharge preloading is widely used in soft soil foundation reinforcement projects. To study the characteristics of changes pore water pressure and settlement as a result effect vacuum–surcharge preloading, this paper, consolidation model was established for large–sized sand–drain fluid–solid coupling along depth direction while taking sequence actual surcharge vacuum into consideration ...

This paper attempts to predict the surface subsidence induced by multi-seam longwall mining in PT Gerbang Daya Mandiri (GDM) underground coal mine Indonesia. Several numerical models of under various depths were built finite difference code software “FLAC3D” which was used as a tool for simulations. Effect sequence and influence lower seam firstly investigated. The angle draw (AoD) maximum (Sma...

Abstract Due to the increasing demand and importance of natural gas in global energy mix, its expeditious recovery is crucial, especially from large-scale unconventional geo-resources. Hydraulic stimulation an established means productivity increase tight reservoirs. The fracture conductivity generally depends on proppant properties, particularly shape. Therefore, this research, effect using ro...

Deep roadway deformation due to soft rock, rock dip, and horizontal tectonic stress is uneven asymmetrical primarily in large loose zones. Traditional anchor support influenced by the yield strength shear of anchors has a limited prestress capacity or resistance. When roof laminated when passes through layered interfaces, interlayer sliding commonly occurs, which can easily lead cables being sh...

In order to ensure the application of gob-side entry retaining by roof cutting for thick and hard sandstone roofs, key technology pre-split blasting was studied. The LS-DYNA used analyze effect energy-gathering pipe. Using methods theoretical analysis numerical simulation, it determined that optimal height 16 m angle 15°. pressure relief verified FLAC3D. It is proposed use deep-hole loosening s...