Numerical simulation on the tip-to-face roof stability considering goaf compaction
In order to study the stability of the tip-to-face roof under different gob compaction,two numerical models inclu-ding the high and low stiffness gob are developed using PHASE 2D finite element software.The vertical displacement of the tip-to-face roof,abutment pressure and the plastic zones on roof are obtained.The results show that:when the gob stiffness is 250 MPa,the maximum roof displacement before and after mining are 90 mm and 109 mm,respectively,compared to 43 mm and 74mm for a 600 MPa gob model.The abutment pressure peak is decreased from 7.3 MPa to 6.8 MPa when the gob stiffness is increased from 250 MPa to 600 MPa.The plastic zone on roof is reduced by 44.3％when the gob stiffness in-creases.Therefore,the roof stability can be improved if the gob stiffness is high,thus reducing the roof cavity.
tip-to-face roof cavitygoafnumerical simulationabutment pressureoverlying rock movement
万方数据
维普
