Research On Section Pillar Parameters And Mining Roadway Support With Extra-thick Coal Seam In Wujiagou Coalmine

In order to solve the problem of coal pillar parameters and frequent roof-fall accidents afterlarge deformation, reasonable pillar parameters is studied in detail and the roadway controllingtechnology is put forward. Combined with the experience of pillar width design and thecharacteristics of roadway deformation in typical coal mine, the optimal direction of pillar width andsupport design of mining roadway at fully-mechanized section NO.5207are proposed byengineering analogy method. Based on triaxial compression test of coal sample, mechanicalcondition criterion of pillar stability is derived by establishing cusp catastrophe model. Incombination with elastic kernel theory, load estimation method, experience estimation method andnumerical simulation method, the reasonable width of coal pillar at fully-mechanized section NO.5207is18m. Combined with triangular fuzzy algorithm and the principle of fuzzy importance, keyinfluence factors to pillar stability are as follows: section pillar width, section pillar height. Based onthe development history of truss connector,“staggered arrangement method”(SAM) supporttechnology containing truss cable and single cable is proposed and its surrounding control principlesare as follows: advantageous complementarities, point-line combination, common carrying andsafety economy. The SAM combined supporting scheme is designed at fully-mechanized section NO.5207, then, the distribution regularities of pillar abutment pressure is measured by borehole stressgauge and the roadway displacement is observed. The research achieves have been applied to5207workface and have brought social and finical benefits promptly.