Analysis On The Stability Of Hydraulic Support In Steeply Dipping Fully And Finite Element For The Key Parts

In recent years, as China’s rapid economic development, increasing demand for coalresources, coal resources are asking for more development, and mining for many years hasbeen to mine occurrence conditions "superior" less and less coal reserves, which turned tocoal reserves account for only15-20%of large angle or up steep seam mining.China is generally believed that coal seam inclination35°~55°angle between the bigcoal, coal mining as big dip migration pressure behavior and the law of specificity, along withcoal mining safety issues also stand out。China’s large steep angle or fully mechanized coalface higher system reliability studies, and focused primarily on the reliability of face supportequipment for the "stand-rock" system stability control research, that large angle or steeplyinclined Workface reliability depends on the stability of support equipment, mechanizedmining hydraulic support large angle stability of the coal face itself has a key role in thereliability of controlAlthough mechanized mining in the coal mining areas, China made greatprogress, but big dip the complexity of coal mining environment, mining process is notreliable, there are many factors that affect the stability of large angle hydraulic support,including people, the environment (seam roof and floor rock), machine (equipment) in threeareas,Personnel are not reliable mainly in the person’s own and operate the equipment,maintenance, and organizational management;Environment, mainly in the coal seam roof andfloor rock difficult to manage, take off the roof instability, floor damage, slip instabilitycaused by the stent, down aircraft accident;Equipment unreliability mainly in hydraulicsupport easily lead to instability and poor support system reliability, there stand down, sliding,squeezing, biting aircraft and other serious problems, as well as coal mining, scraper conveyordecline in the stability of the stent.Therefore, in order to make a large angle seam mining safer,reliable, and should strengthen the mechanized mining of large angle stability of hydraulicsupport.In this paper, a large opening angle of longwall coal mining to the law of pressure behavior,migration characteristics, roof and floor rock of the instability mechanism and influencingfactors are discussed.Analysis of a large coal mining angle bracket and hydraulic conditionssurrounding the relationship between stability and supporting bracket may occur during theforward, reverse, and are down three kinds of supporting morphological types, and the bracketsupporting the existence of morphological types and their formation The analysis of thecauses.