Without Coal Pillar Mining Research About Gob-side Entry Retaining With Anchor Cable And Dense Pillar

In this paper,with the Binlang coal mine N1015101mining working face asengineering background, combining the theoretical analysis, numerical simulation andfield test, in slowly inclined medium-thickness coal seam anchor rope pillar along theempty into the lane and dense rock strata control theory, the stability of surroundingrock, the deformation and failure law of roof,the roadway supporting technology andthe regularity of mine pressure appear are analyzed research and successful experimentin the field.The main research content and the related results were as follows:①based on the analysis of the characteristics of the activity in the slowly inclinedthick coal seam roof, it is concluded that the direct roof in the gob hung Lou area, thegreater the effect on along the empty left lane of the roof pressure, the greater the minepressure appear, the more intense, so should be promptly cut off the immediate roof inthe gob roof hanging. The support on the roof of anchor cable and dense pillar ofsupport that, within the immediate roof can be on the edge of the mined-out area form alarger shear stress and bending moment, immediate roof on the edge of the gob fractureeasily.②the main roof near the wall along the empty left lane next help coal fracture,along the tilt direction will produce rotary sinking, sinking in the rotation formed in theprocess of "balance" masonry beam structure, the equilibrium condition and the strengthof the main roof and main roof fracture degree and subsidence about rotary, thestructure is to protect the big rock mass structure along the empty left lane. In order topromote the stability of the structure, request the support on has larger resistance andcertain can drop-off in selected for this pillar support should be used under the conditionof intensive protection of bottom and top beam top big base.③adopt anchor wire rope combined support form inside lane, limit the immediateroof abscission layer and immediate roof and main roof abscission layer.Use of theeffect of bolt will be under the direct roof rock formation "composite" increase thestiffness of the resistance to deformation of roof, the role of anchor cable is used tochange the "composite" on the top of the hanging to the old, synchronize the immediateroof and main roof movement, is advantageous to the alley roof subsidence reduction.④the state of discrete element method is used to examine the caving working facealong the strike and the tendency of surrounding rock damage and the stress and strain concentration situation, and simulates the along the empty left lane support scheme,conclusion of roof and floor is relatively close to amount to180mm, two relative closerto150mm.By the field test and rock pressure get N1015face observations, and theresults are in conformity with the instructions slowly inclined thick coal seam in theanchor cable with dense pillar cut along the empty left lane jacking technology tosuccess in the bin lang N1015working face of coal mine, the support type andreasonable support parameters are designed.⑤this thesis research achieved good technical and economic benefits, increase therecovery rate of5-10%, alleviate the conflict between production to replace nervous, forthe same type slowly inclined thick coal seam have no pillar mining providesexperience.