CAJ | 학술논문

针对淮南矿区煤矿11-2煤层覆岩物理力学特性,利用ANSYS软件中死活单元技术与材料非线性分析方法,模拟在不同表土层厚度下覆岩的水平变形情况,研究表土层厚度对瓦斯抽采钻孔稳定性的影响。研究结果表明,不同表土层厚度下,覆岩水平变形“O”形圈现象明显,并表现出明显的对称性,Ⅰ测线和Ⅲ测线变形错动明显,呈现趋势对称,梯度差值不对称；Ⅱ测线表土层变形平缓；随表土层厚度增加,覆岩水平位移最大变形位置明显由地表、表土层底部向表土层下部基岩转移,基岩梯度变化区间个数明显减少,梯度差值增大；工作面中部Ⅱ测线位置不容易剪断,但中部的破碎岩体易被压实,后期抽气效率不高。
침대회남광구매광11-2매층복암물리역학특성,이용ANSYS연건중사활단원기술여재료비선성분석방법,모의재불동표토층후도하복암적수평변형정황,연구표토층후도대와사추채찬공은정성적영향。연구결과표명,불동표토층후도하,복암수평변형“O”형권현상명현,병표현출명현적대칭성,Ⅰ측선화Ⅲ측선변형착동명현,정현추세대칭,제도차치불대칭；Ⅱ측선표토층변형평완；수표토층후도증가,복암수평위이최대변형위치명현유지표、표토층저부향표토층하부기암전이,기암제도변화구간개수명현감소,제도차치증대；공작면중부Ⅱ측선위치불용역전단,단중부적파쇄암체역피압실,후기추기효솔불고。
Based on the physical and mechanical properties of overlying strata of 1 1-2 coal seam located in Huainan mining area,the paper researches the impact of the thickness of topsoil on stability of gas drainage boreholes.It uses the birthGdeath element technology of ANSYS softG ware and the material nonlinear analysis methods to simulate the horizontal deformation of overG lying strata with different thickness of topsoil.The results show that OGring phenomenon of oG verlying strata is obvious and the horizontal deformation presents obvious symmetry with differG ent thickness of topsoil;Ⅰand Ⅲ survey lines show the tendency symmetry and gradient differG ence asymmetry with evident dislocation deformation;however,deformation of topsoil of Ⅱ surG vey line is gentle;with the increases of topsoil thickness,the maximum horizontal displacement deformation position of overlying strata transfers to the bedrock from the surface and the bottom of topsoil,and the number of gradient interval significantly decreases and gradient difference inG creases;the position of Ⅱ survey line in middle part of working face is not easy to cut,but the broken rock is easily compacted,so the gas postGextraction is not efficient.