Research On Hydraulic Support Stability Of 6.0m Mining Height In Thick Coal Seam

Stability of large mining height hydraulic support is essential to safe production and high efficiency of working face.The article is sure that average consistent coefficient ( f ) of 5-2 coal seam in.15201 working face in Zhang jiamo colliery is 4.0, and basically need mechanics rigidity demands in 6.0m high height working face. By building up roof physical and mechanics model applied to confirm positions of key strata and estimated that working resistance of supports is 12000KN, and initial force is 7395KN.In the numerical simulation searching for coal wall stability, the conclusion is that with advent of enlarging mining height and falling initial force wall caving is more severe. Also in the experiment of material simulation it is also demonstrated that first weighting pace of main roof is 65m, average periodical weighting pace is 15m, and dynamic load factor is some 1.3. Those mentioned ensure weighting type of roof is II level obvious one and adopt dual pillar shield supports. The influence of abutment pressure is about 90m, especially concentrated zones at some 52m, being far away with working face. Rotation movements bring about a gigantic impulse resulting in deterioration of supports.According to pressure observation of the stope, actual periodical weighting pace is about 11.2m and dynamic load factor is 1.42.So both working resistance of supports and initial force are satisfied with mining demands, and the type of hydraulic support is accurate.Stability of high height supports conforms Homes Using machines and comes true high efficiency and large products in the colliery. The article offers a valid experience for stability of high height supports in similar geo-condition, and also stability of high height supports in other condition can use for reference.