The strata movement induced by sub-critical extraction is a problem not receiving due attention because of its relatively small magnitude of deformation.However,with the increase of mining depth,sub-critical extractio...The strata movement induced by sub-critical extraction is a problem not receiving due attention because of its relatively small magnitude of deformation.However,with the increase of mining depth,sub-critical extraction has become a general phenomenon.This calls for an in-depth investigation into the characteristics of ground movements observed under different extents of sub-critical extraction,so as to determine the appropriate mining technique for use.Following a discussion of the factors influencing the extent of super-critical extraction,the super-critical extraction extent evaluation criteria was presented,the characteristics and laws of the strata and ground movements caused by such an extraction condition were systematically analyzed,and the mechanism of surface subsidence induced by sub-critical extraction was revealed.The result of study may serve as a basis for the development of the strata and ground movement prediction model and the mining techniques appropriate for use at depth beneath surface structures and buildings.展开更多
基金Project supported by Doctoral Study Courses Foundation and Post-Doctoral Scientific Foundation.
文摘The strata movement induced by sub-critical extraction is a problem not receiving due attention because of its relatively small magnitude of deformation.However,with the increase of mining depth,sub-critical extraction has become a general phenomenon.This calls for an in-depth investigation into the characteristics of ground movements observed under different extents of sub-critical extraction,so as to determine the appropriate mining technique for use.Following a discussion of the factors influencing the extent of super-critical extraction,the super-critical extraction extent evaluation criteria was presented,the characteristics and laws of the strata and ground movements caused by such an extraction condition were systematically analyzed,and the mechanism of surface subsidence induced by sub-critical extraction was revealed.The result of study may serve as a basis for the development of the strata and ground movement prediction model and the mining techniques appropriate for use at depth beneath surface structures and buildings.
