Coal auger mining is a promising technology used for excavating thin coal seams. The efficiency of largely related to the stability mine roadways in influence zone coal-face. Roof bolting systems are such conditions. An adequate choice roof parameters only possible if one understands features stratification rocks and stages deformation array mining. Modern monitoring methods condition based on ...

Considering the factors affecting surrounding rock stability of gob-side entry retaining, applicability a large-diameter, concrete-filled steel tube roadside support body in top-coal caving fully mechanized face is discussed, and new approach to retaining proposed this study. The mechanical model structure was established, critical state column–roof contact shear slip instability clarified thro...

Aiming at the wide range of rock strata movement and collapse, poor stability high damage rate working face support being prone to crushing in large mining height face, analog simulation, theoretical analysis, field measurements have been carried out analyze roof breaking structure form calculation method reasonable resistance face. The researches show that, affected by space mined-out area, wi...

Mine pressure at the working face is severe due to it being directly covered by a thick hard roof. To further investigate technology of controlling mine roof, upper 13,121 in Gubei Huainan mining area was used as engineering background, and similar simulation experiments, mechanical analysis, numerical simulation, applications were obtain structure pre-cracked cut roof falling body, well establ...

This article highlights the difficulties that arise in coal mining when roof areas have fractures with an opening of up to 0.2 - 0.5 m. Such situations may cause collapse. The seismic exploration method used by authors assess geomechanical characteristics extraction columns is described. results work on identification and registration unstable are presented.

Grotta dei Cervi is a cave which opens into the Oligocenic Calcarenites at 26 m above sea level on the channel of Otranto, 370 m NE of Porto Badisco, Lecce, southeastern Italy. It was discovered on February 1, 1970. From the geomorphological point of view, the cave is the site of an ancient underground water table. The innumerable concavities which are visible on the roof of the gallery have fo...

To reveal the critical factors of main roof influencing stability surrounding rocks roadways driven along goaf in fully-mechanized top-coal caving faces, this paper builds a structural mechanics model for based on geological conditions 8105 face Yanjiahe Coal Mine, and stress equilibrium key rock block B are analyzed, focus is analyzing rules goaf. Then, orthogonal experiment range method used ...

Aiming at the mining disaster of a thick hard roof, based on analysis instability influence this study constructs bearing mechanical model roof by using theory and obtains distribution equation energy accumulation, release equation, dynamic load response hydraulic support in working face, as well characteristics putting forward technical countermeasures for strong pressure control face. This re...