Analysis of bearing mechanism and influencing factors about dual structure of pillar and filling

Li Xue-hua, Lv Wei-dong, Wang Yi-pin, Zhu Shou-song
2009 Procedia Earth and Planetary Science  
Using the way of driving and filling by solid wastes to replace parts of coal is an important technical path for solving protective coal pillar of "under three" coal mining and industry square in our coal mine, and the key depends on whether the new bearing structure formed by backfill and residual pillars can effectively substitute for the original large coal pillars or not. We obtained the influencing factors from stable dual bearing structure by the establishing mathematical model and
more » ... hing on mechanism of overlying strata of dual bearing structure. Combined with the actual condition of protective band coal pillar of filling and recovery, some elements which are important to coal pillar stability have been researched, such as the width of the middle pillar, quantity of filling roadway, size of filling roadway, and grade of filling roadway. The results are successfully applied to the recovery of protective band coal pillar in the 4th region of the 1300 mining area that its surface is stability and some parts of coal pillars are recovered, and thus obtain a well engineering application purpose and economy benefit.
doi:10.1016/j.proeps.2009.09.047 fatcat:cb4vcyj2gfhshoxv22hcgwlbmy