大采高垛式液压支架设计

Design of high cutting chock type hydraulic support

针对榆林矿区某矿大采高综采工作面回风巷采用超前支架、单体支柱或木垛进行超前支护存在支护效果差、支护速度慢、支护成本高、工人劳动强度大等问题,设计了一种大采高垛式液压支架。对该支架在顶梁偏载与底座扭转、顶梁扭转与底座集中载荷、顶梁集中载荷与底座偏载3种工况下进行有限元分析,通过分析应力云图和变形云图发现该支架整体受力均匀,无明显应力集中现象,且支架未出现较大变形;对该支架进行现场测试,结果表明,该支架支护作用下的巷道围岩变形量小,有效保证了工作面巷道的安全。

In view of problems of poor support effect,slow support speed,high support cost and great labor intensity of advance support with advanced hydraulic support,single hydraulic prop or timber in return airway of fully-mechanized high cutting coal mining face of a coal mine in Yulin mining area,a high cutting chock type hydraulic support was designed.Finite element analysis of the support was conducted under three kinds of operating conditions namely top beam eccentric load and pedestal torsion,top beam torsion and pedestal concentrated load,top beam concentrated load and pedestal eccentric load.The stress nephogram and deformation nephogram show that the whole support is stressed uniformly without apparent stress concentration phenomenon and large deformation.The field test result show that the support can effectively guarantee safety of working face roadway with small deformation of surrounding rock of roadway.