公开(公告)号：US12098637B2

公开(公告)日：2024-09-24

申请号：US18595263

申请日：2024-03-04

申请人： Taiyuan University of Technology

发明人： Guorui Feng ,  Wei Guo ,  Tingye Qi ,  Zhu Li ,  Jiaqing Cui ,  Yekai Cui ,  Jingkai Ma

IPC分类号： E21C41/18 ,  E21F15/00

CPC分类号： E21C41/18 ,  E21C2100/00 ,  E21F15/00

摘要： An I-patterned filling method for an initial stage of coal mining based on roof fracture characteristics is provided. A relationship between an overburden load borne by a main roof and an overhang size is determined based on principle of virtual work and a surgery theory when an overhang distance of the main roof reaches an initial weighting interval to enter a plastic limit state with an advance of a working face to obtain the initial weighting interval. An initial fracturing interval of an immediate roof is obtained in the same way. According to a subsidence law of the main roof in an inverted hip roof form, the filling is performed at a key position around an internal plastic hinge line through I-patterned three-strip filling. Size parameters of the I-pattered filling are designed to prevent the immediate roof and the main roof from being fractured.