Borehole stress-meter and method and apparatus for the installation thereof
US4542655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1984 |
| Grant date | Sep 24, 1985 |
| Priority date | — |
| Expiry date | May 9, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B5/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A borehole stress-meter includes a resiliently radially expandable hollow body within which can be positioned a gage plug having strain gages fixed thereto. The interior section of the hollow body is tapered, as is the gage plug so that advancement of the gage plug within the hollow body will cause the gage plug to become prestressed. The hollow body can be inserted into a bore drilled in earth material whose stress is to be measured by an installation or setting tool. Subsequently, the gage plug is advanced within the hollow body so as to prestress the gage plug. The setting tool is then removed and stress may be measured by an appropriate strain indicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.