Study on Control Technology of Overburden Rock Instability Structure of Gob-side Entry Retaining under Dynamic Pressure in Gucheng Coal Mine
Based on the auxiliary air intake roadway of N 1306 working face in Gucheng Coal Mine of Shanxi Lu'an Mining(Group)Co.,Ltd.,the deformation control of surrounding rock of gob-side entry retaining in deep and thick coal seam is studied.The fracture characteristics of overburden structure of gob-side entry retaining are studied by theoretical analysis,and the fracture mechanics models of immediate roof and main roof are established by combining the fracture parameters of overburden rock.It is determined that the supporting resistance of roadside filling body required for the fracture of immediate roof and main roof is 0.38 kN/m2 and 9.49 kN/m2 respectively,which provides data support for roof cutting of gob-side entry retaining.Based on the geological conditions of the mine,the supporting parameters of the retaining roadway are designed.Through the deformation monitoring of the surrounding rock,the overall deformation of the roadway is determined to be stable.The deformation of the filling wall and the coal side is less than 50 mm,the floor heave is less than 200 mm,and the roof subsidence is not more than 125 mm.The relevant research conclusions can provide the basis and guidance for the actual production of the mine.
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