公开(公告)号：US12221888B2

公开(公告)日：2025-02-11

申请号：US18885086

申请日：2024-09-13

Applicant: Taiyuan University of Technology

Inventor： Guorui Feng ,  Zhu Li ,  Jianyu Fan ,  Jingyu Zhang ,  Chengen Qi ,  Guilin Wu

IPC: E21F1/18 ,  E21D23/04 ,  E21F1/10

Abstract: A ventilation method for a high gas working face based on alternating intake and air return in a mine gallery is provided. In this method, an isolated island working face is divided into several sections along a strike direction. A coal pillar is alternately set as a conventional section and a gas-drainage section. Opposite coal pillars in the two mine galleries within the same section are respectively used as the conventional section and the gas-drainage section. Two mine galleries on both sides of the isolated island working face are alternately used as an intake gallery and a return gallery. The coal pillar at the side of the mine gallery as the return gallery is the gas-drainage section. A gas-drainage hole communicating a goaf is provided in the gas-drainage section, so that gas in the goafs at two sides of the isolated island working face can be extracted alternately.

公开(公告)号：US12098637B2

公开(公告)日：2024-09-24

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 ,  E21F15/00

CPC classification number: E21C41/18 ,  E21C2100/00 ,  E21F15/00

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.