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.
关键词
端面冒顶/采空区/数值模拟/支承压力/覆岩移动
Key words
tip-to-face roof cavity/goaf/numerical simulation/abutment pressure/overlying rock movement
维普
万方数据