The gateway of the thick coal seam working face in Datong mining area was excavated along a small pillar, resulting serious bolt (cable) breaking failure, strong surrounding rock deformation, ground pressure appearance, and difficulties control. So, characteristics corresponding causes 5106 return air with pillar Dongzhouyao mine (a area) were analyzed through an on-site investigation, geotechn...

Abstract With the increased use of cable bolts in mining and civil projects worldwide, it is important to understanding performance these support structures different scenarios. The axial load transfer mechanisms six were investigated experimentally this research study. A large-scale pull-out testing apparatus with a capacity 1000 kN was designed manufactured as part investigation. common comme...

Elastic interaction effect commonly exists in the assembly of multi-bolted joint. It is defined as loss tension forces some bolts due to progressively tightening neighboring bolts. Main cable clamp a large size bolted joint used suspension bridge. Investigation on bolt has seldom been reported. This article presents field experiment study tightening. In experiment, three types and sequences wer...

Background: Coal mining requires safe and effective roadway support to ensure production worker safety. Anchor is a common method used for controlling the roof of coal seams. This study aims analyze effectiveness different anchor schemes provide theoretical basis designing support. Methods: The authors computer simulation tool called FLAC3D simulate spacing between bolts, bolt length, cable con...

Abstract Numerical simulation is a useful tool in investigating the loading performance of rock bolts. The cable structural elements (cableSELs) FLAC3D are commonly adopted to simulate bolts solve geotechnical issues. In this study, bonding interface between bolt and grout material was simulated with two-stage shearing coupling model. Furthermore, FISH language used incorporate shear model into...

Stability of the retained goaf-side gateroad (RGSG) is influenced mainly by the movements of the roof strata near coal seam after coalface passes by. To make effective controlling technology for the stability of the RGSG, we analyze the roof structure over the RGSG to illustrate the mechanism causing the RGSG instability under different roof conditions. We then examine the dynamic evolution of ...