Key parameter design and benefit analysis of hydraulic support for extra long working face
In order to solve the problem of severe mining pressure during the mining process of ultra long working faces,this article taking the 400m ultra long working face of Weiqiang Coal Mine as the engineering background,analyzes the main pa-rameters of hydraulic supports for several coal mines in northern Shaanxi through analogy,load estimation method,FLAC3D numerical simulation,and conventional arch theory to comprehensively determine the support strength and working resistance of hydraulic supports.Using the existing pressure monitoring data of hydraulic supports for 300 m working faces,the main parameters are checked and corrected,and the economic benefits and advantages and disadvantages of 300 m working faces and 400 m ultra long working faces are compared and analyzed.The results show that the hydraulic support strength for the 400 m ultra long working face should not be less than 1.2 MPa,and the working resistance should not be less than 17 000 kN,which can achieve roof stability control,reduce the amount of tunnel excavation work,improve the efficiency of the fully mechanized mining face,and solve the problem of mining continuity.It can meet the mining requirements of an an-nual output of 7 million tons of coal resources,and has good economic and social benefits.
extra long working facehydraulic supportsupport strengthwork resistanceeconomic benefits
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