Method for classifying phreatic leakage disaster level in shallow coal seam mining
US11060402B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2019 |
| Grant date | Jul 13, 2021 |
| Priority date | — |
| Expiry date | Feb 1, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C39/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for classifying a phreatic leakage disaster level in shallow coal seam mining includes the following steps: S1. arranging a monitoring hole in a coal mine working face and burying a telemetering water level gauge to perform water level monitoring; S2. monitoring a ground elevation, calculating a ground subsidence amount, and collecting mining advance distance information; S3. plotting variation relationship curves of mining advance distance and phreatic water level as well as mining advance distance and ground subsidence according to monitored information, respectively; and S4. comparing the curves with a no-leakage graph, a slight-leakage graph, and a heavy-leakage graph, and determining a leakage level; and S5. further classifying a studied area as an environmental disaster area or an environmentally friendly area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.