As a result of the complex geological conditions sand-cobble stratum, various types problems may arise during construction tunnels crossing most prominent which is stability problem face. In order to study tunnel face in first, continuous medium model sandstone soil established, and numerical simulation carried out on three-axis compression test analyze its micro-mechanical characteristics. Sec...

In order to study the optimal coal pillar width and surrounding rock control mechanism of gob-side entry under inclined seam condition, 130205 return air adjacent 130203 gob in Yangchangwan No. 1 well is taken as a typical engineering background. By means background analysis, theoretical analysis based on inside outside stress field, numerical simulation by FLAC3D software, situ industrial test...

Abstract According to the latest physical mechanical parameter of rock, crustal stress, section style and support parameter, rock stability intersection EVT- Ventilation Tunnel 2-1 Shaft 2 is analyzed verified through FLAC3D on base actual geology test value stress.

Grouting reinforcement is one of the most effective methods to enhance stability goaf, and its scheme selection, hole location, parameter determination directly affect success or failure goaf treatment. On basis discussion deformation mechanism evolution law longwall this article comprehensively analyzed grouting combined with filling theory, permeability fracturing theory studied physical chem...

Owing to the shortcomings of blindness and inaccuracy when backfilling in goafs based on key stratum theory, we propose “multi-arch pier-column” method. This method involves drilling holes at specific locations surface inject filling slurry materials into goaf separation area under stratum. allows broken gangue be cemented form a stone body, improve its overall strength. process, along with str...