Rock burst is easy to occur in the water-rich roadway of coal mines, which closely related energy dissipation and fracture mechanism rocks under coupled hydro-mechanical (H-M) unloading. Therefore, combination with triaxial loading unloading process H-M coupling effect, mechanical test layered sandstones (TLUTP) was conducted. The were revealed. results show that: (1) influence angles on peak v...

The article presents the results of tests on SHC-40 hydraulic props equipped with two types valve blocks: standard (with spring steel cylinder) and BZG-2FS gas spring). research was conducted using impact mass 4,000 kg extreme dynamic load free fall 20,000 released from different heights h. involved a camera speed image capture up to 1,200 frames/sec, which made it possible register stream liqu...

Rock burst disasters occurring in underground high-stress rock mass mining and excavation engineering seriously threaten the safety of workers hinders progress construction. classification prediction is basis reducing even eliminating hazards. Currently, most mainstream discriminant models for grade are based on small samples. Comprehensive selection according to many pieces literature, maximum...

In the process of coal resources development, a large number strip pillars have been left behind in mines central–eastern China. With increase mining depth year by year, rock burst threat is becoming more and prominent due to influence buried depth, geological structure, gob other factors. Backfilling main means recover residual pillar. order investigate effect backfilling on prevention control...

Abstract Rock bursts are a serious geological disaster occurring in deep underground engineering operations, which will cause casualties and economic loss. The quantitative threshold of energy fractal dimension for immediate rock burst warning tunnel was studied. study conducted based on the cases tunnels Jinping Hydropower Station, China. Firstly, calculation method proposed linear associated ...

Pressure relief drilling is one of the most common techniques to reduce impact rock burst, but useful dynamic phenomena in process are ignored due lack corresponding technical methods. Based on fact, an innovative measurement method for vibration signals during construction by pneumatic drill rig presented this study. The acquisition and analysis show that information can reflect depth, amplitu...

Abstract High rock stress and ground temperature pose great threats to the routine production of longwall top coal caving (LTCC) panels. In this risky condition, width chain pillar is considered a factor adjustable for controlling burst goaf ignition hazards. However, contradiction, as suggested by experience, that narrowing helps prevention but negatively leads higher self-ignition potentials,...