Evaluation of the stability a shallow goaf in an open-pit iron mine is important for successful mining. Based on idea “rock disaster analysis and prediction combining field monitoring numerical simulation,” modification Mathews graph proposed, scheme combing stress, displacement, surface subsidence selected per geological condition. The displacement data model are combined, corrected data; time...

To analyze the excavation stability and reasonable reinforcement measures of cutting slope with a goaf collapsed roadway mining face, finite element software Midas GTS NX was used to model change in coefficient under different ratios. Combined scope project land, it is proposed that ratio grades 1–3 (close top cut) 1:1.5, while 4–6 bottom 1:1, excavate slope. During process, plastic zone after ...

Aiming at the gas over-run problem in upper corner of “U-type ventilation” end-mining working face multi-source goaf #15 coal seam Phoenix Mountain Mine, site survey and numerical simulation methods were adopted, which showed that maximum caving zone height is 14.87 m, fissure 51.63 m. On this basis, control scheme “U+ omni-directional large-diameter high-level borehole along roof strike” was f...

Abstract Coal is the one of foundations energy and economic structure in China, while unsealing coal mine fires would cause a great risk re-ignition. In order to explore influence pressure-bearing state on re-ignition characteristics for residual coal, uniaxial compression equipped with temperature-programmed device was built. The scanning electron microscope, synchronous thermal analyzer Fouri...