Abstract In recent decades, many open pit (OP) mines have either already made the decision or are at planning stage to change their mining activity from OP underground (UG) remain competitive. Technically, before ends its operation, both and UG will be operated simultaneously for a certain period of time. It is well known that operation causes subsidence, discontinuous deformations, changes in ...

Gas extraction in the pressure-relief area using depressurization effect of seam mining is an effective way to solve coal-mine gas problems. In this paper, we performed numerical modelling 204 working face via FLAC 3D, by which stress variation rock mass and associated permeability evolution during advancement were investigated. Furthermore, favorable zone for pressure relief was proposed based...

Original scientific paper Mining near the fault structure can easily lead to the fault activity and induce serious geological disasters, posing a serious threat to coal mine safety production. To reveal the surrounding rock activity characteristics induced by near-fault mining, taking Qixing Coal Mine in China as the engineering background, the contrastive analysis of the microseismic events in...

Apparent particle size grading is the most important characteristic of super-high dumping site. On the basis of the development of the HHC-CA model and on-site survey of granular size distribution, the slope model of current situation, had considered the features of particle size grading, was established according to a super-high dumping site. FLAC was used to analyze the slope stability of cur...

Goaf restoration is an important part of urban space management. With mining coal resources, appearance goaf and subsidence areas causes serious geological disasters environmental ecological problems, which significantly affect safety, development, construction. Therefore, repair goafs crucial. In this study, the Jingmen Garden Expo Park was taken as example. Through acquisition engineering con...

Retaining walls in axi-symmetric conditions and plane strains have been widely treated the literature using different approaches (limit equilibrium, limit analysis, slip line, numerical techniques by finite elements or differences). The element difference method provides more accurate solutions to problem than equilibrium method. In this paper, a new model of retaining wall axi-symmetry under o...

Rock failure during tunnel excavation is still a matter of concern. The influence groundwater generally taken into account along discontinuities or in “soil-like” formations. However, brittle saturated porous rocks can be subject to undrained conditions excavation. Negative effective stresses develop close the boundary. This study aims at identifying limit pore pressure rock around tunnel, whic...