The gob-side entry driving is in low pressure area, which bears less support and easy to maintain, so it widely used. Taking the thick coal seam of Dongtan Coal Mine as an example, reasonable size pillar section roadway are numerically simulated by combining numerical with measurement, designed. According distribution lateral stress working face, eight pillars different sizes By simulating comp...

Engineering site and shaft pillars are excavated to prolong the life of collieries excavate more underground coal. The Jinggezhuang colliery (‘JGZ’) is a resource-exhausted coal mine in eastern China. It was determined that industrial pillar JGZ would be extracted 2008. This study an experimental panel examine effect excavation on surface buildings complicated geological conditions. A new desig...

Directional hydraulic fracturing method (DHF method) for controlling hard roof in coal mines and the means of its implementation is given paper. The allows getting extended, set a direction cracks stratification cutting off providing their controlled caving different technological schemes. Geo-physical methods are introduced, monitoring mine site experimental testing data on roofs applying extr...

The re-exploitation of coal seams located near the ground is one solutions to increase output, reduce mining investment costs, and avoid wasting resources. will also cause instability surrounding rock mass may affect surface construction works. Through process re-exploiting longwall in seam H10 at Mong Duong Coal Mine, authors have studied evaluated stability +30 level works (including fan stat...

To achieve a successful and effective operation, the transition from open pit to underground mining requires accurate planning analysis. Numerical modeling utilizing programs like FLAC3D has been an important tool for simulating analyzing complicated geomechanical behavior connected with this shift in recent years. The use of develop model switch coal soft rocks using room pillar method is expl...