I-patterned filling method for initial stage of coal mining based on roof fracture feature characteritics
US12098637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2024 |
| Grant date | Sep 24, 2024 |
| Priority date | — |
| Expiry date | Mar 4, 2044 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21F15/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.