In the process of coal seam mining, there are often hard thick key layers in overlying strata. Due to high strength and good integrity layer, after layer is broken, strata will collapse lose stability a large area, which very easy induce dynamic disasters such as rock burst, mine earthquake, wall caving, roof slab caving. Aiming at working face, response under strong earthquake induced by break...

Original scientific paper With the increase in mining depths and the occurrence of worsening conditions, deep, large-scale and rapid mining may lead to more complicated dynamic features for tunnels, making them vulnerable to dynamic disasters such as rock bursts and coal/gas outbursts with subsequent heavy damage and casualties. A three-dimensional structural mechanics model for deep stopes was...

After the wenchuan earthquake, dynamic response law of rock slope under action load is a very concerned and urgent problem in field seismic engineering. This paper analyzed simplified cosine wave by numerical simulation with FLAC3D software. research emphatically variation amplification coefficient displacement, acceleration velocity condition different height, angle, period amplitude, which pr...

pits, quarries, and on construction sites. The prediction of the penetration rate of drilling machines is very important for cost estimation and planning of rock excavation projects. Many researchers have investigated percussive drilling theoretically or experimentally and correlated the penetration rate with various rock properties. Protodyakonov (1962) developed drop tests and described the c...