Method of relieving earth pressure in a working area
US4307978A · kind A · utility
1Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1979 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | Nov 16, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21F17/185
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The earth pressure in the underground working area is effectively alleviated by injecting high-pressure liquid into a weak ground stratum underlying the ore bed being excavated thereby to enlarge the stress envelope formed around the working face. The liquid injection hole is formed as by drill means to extend from the working face or a neighboring gateway through an intermediate layer into the weak stratum preferably at a point outside of the stress envelope initially formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.