The geological disasters caused by the ground deformation of goaf have brought huge security risks to ecological environment and society. Therefore, it is imminent realize effective monitoring stability analysis goaf. In this paper, taking gypsum mine in Diaodao District, Jingmen City as an example, through investigation overall structure distribution characteristics goaf, combined with mechani...

To solve the technical problems in controlling surrounding rock of gob-side entry retaining deep and close distance coal seams under goaf, deformation failure characteristics goaf were analyzed this paper. Basic support inside roadway high-strength prestressed wire meshes, beam cable anchor, reinforcement single hydraulic with hinged roof roadside high-water material filling structure proposed....

The key parameters of pressure relief pre-splitting blasting technology (PRPBT) contribute to the implementation effect goaf-side entry by roof cutting (GSERC). This study is an attempt design including height, angle, spacing between boreholes, charge structure and sealing length using theoretical analysis, numerical simulation field implementation. basic quality index main 666.27, combined wit...

The indicative ability of a gas indicator for the spontaneous combustion coal is affected by secondary oxidation oxidized coal, from old goafs, entering new goaf through air leakages. This phenomenon can affect accuracy early warning systems regarding in goaf. In this research, three kinds were selected to carry out simulation experiment which temperature-programmed experimental device was used...

The disturbance depth of traffic load has a direct impact on the stability room-and-pillar mining goaf. To quantitatively calculate relationship between and influencing factors, 49 groups horizontal combinations different parameters are designed in this study, based orthogonal experimental design method. Midas GTS is used to simulate obtain corresponding data. A multivariate linear regression a...

To solve the problem of gangue discharge in coal mining, fluidized filling technology was developed. The key scientific this is diffusion characteristics goaf. Therefore, a discrete element model established based on ARR contact model. Based Rblock module, goaf with certain void ratio created, and meso-parameters were calibrated. rock displacement laws explored under different grouting speeds, ...

This study investigated the influence of water injection timing on compression deformation loose rock blocks in goaf. The used a confined gradient loading test to examine under initial saturation and later immersion conditions. results showed that saturation, each whole stage was greater than stage. Additionally, different stages saturated state relatively regular, while state, changed abruptly...

China's coal production has formed a large number of goaf, which contains amount and coalbed methane resources. If these resources are stored in the it will not only cause waste resources, but also environmental pollution if goaf leaks into atmosphere. Therefore, utilization is imminent. In order to achieve purpose efficient extraction, necessary evaluate As an important part desorption law aba...

Abstract Numerical simulation approaches have been widely applied to study mining induced subsidence, and they are potential methods the flooding uplift for abandoned mines. This paper gives an overview about different numerical simulate by underground mines, including three hydraulic conditions, considering both unconfined confined water conditions. Four basic schemes using 1-dimensional rock ...