An Analysis of Stresses and Displacements Around a Fault Due to Longwall Face Advance

摘要

This study has analyzed 3D stress and displacement distributions around a retreating longwall face intercepted by a geological fault. Analyses considered longwall set-up and development entries, and the longwall face. Linear elastic rock mass behavior was used for analysis except in areas adjacent to the fault where non-linear Hoek- Brown failure criterion was used. Data analyses along several lines in the roof and floor included roof-to-floor displacements and stress concentration factors. The displacements across the face in set-up entries were 35% larger with the fault present. Similar data parallel to the face advance varied with the face location. Vertical displacements were similar for this specific fault orientation. Similar analyses are also included for development entries and T-junctions. These data were compared with field measurements in longwall set-up and development entries.