Study on Roof Strata Movement Law of Solid Filling Stope
Solid filling mining can effectively control the movement of rock strata and surface subsid-ence in the stope.The migration law of overlying strata is quite different from that of traditional caving meth-od under the support of filling body.In order to reveal the movement law of roof strata in solid filling stope,by means of field investigation,theoretical analysis and numerical simulation,the relationship between roof subsidence and support force of filling body is clarified.The stress model of roof in filling mining is estab-lished,and the mechanical conditions of immediate roof in filling mining are given.At the same time,based on FLAC3D simulation software,the distribution characteristics and variation rules of stress and strain of sur-rounding rock in mining-filling process are simulated.The results show that the control effect of filling body on overlying strata is restricted by geology,materials and technology.The peak value of advanced concen-trated stress in the working face of solid filling mining is 15 m in front of the working face,the concentrated stress in the goaf is 40 m behind the working face,and the stress in the 10 m range of filling goaf behind the working face is reduced.With the continuous filling of the goaf,the maximum displacement occurs in the filling body near the side of the working face.After filling,the total deformation of the surrounding rock in the goaf is reduced by 58.14%,and the total deformation of the coal wall in front of the working face is about 37.5%.The research results further confirm the inhibitory effect of the filling body in the goaf on the deformation of the surrounding rock of the stope,and provide a theoretical basis for the roof control theory and engineering practice of solid filling mining.
solid filling miningstope stressrock movement lawnumerical simulation
万方数据
维普
