公开(公告)号：US20240209734A1

公开(公告)日：2024-06-27

申请号：US18595263

申请日：2024-03-04

Applicant: Taiyuan University of Technology

Inventor： Guorui FENG ,  Wei GUO ,  Tingye QI ,  Zhu LI ,  Jiaqing CUI ,  Yekai CUI ,  Jingkai MA

IPC: E21C41/18

CPC classification number: E21C41/18 ,  E21C2100/00

Abstract: 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.