Behavior of a rigid inclusion stressmeter in an anisotropic stress field
The rigid inclusion stressmeter is an instrument designed to measure variations of the in situ stress around a borehole. It consists of a stiff hollow steel gage body that is preloaded across a borehole diameter. Changes in the in situ stress result in slight deformations of the gage body that affect the stress in a highly tensioned wire in line with the rock contact surfaces. Stress changes in the wire are monitored with electronics that measure its natural frequency. To study the behavior of a stressmeter in anisotropic stress fields, a number of linear elastic, finite element analyses were performed where the effects of anisotropic stress changes, elastic properties of the rock-mass, and preload stress settings could be investigated. The calibration program consists of two parts. The first involves subjecting basalt and aluminum cylinders containing stressmeters to changes of stress equal in all directions and normal to the axis of the cylinders. The second part involves setting a stressmeter in an aluminum slab that is subjected to a one-dimensional stress change. (LEW)
- Research Organization:
- Rockwell International Corp., Richland, WA (USA). Rockwell Hanford Operations; New Hampshire Univ., Durham (USA). Dept. of Civil Engineering; Goldberg-Zoino and Associates, Inc., Newton Upper Falls, MA (USA)
- DOE Contract Number:
- AC06-77RL01030
- OSTI ID:
- 5252381
- Report Number(s):
- RHO-BW-SA-208P; CONF-820803-11; ON: DE82016063
- Country of Publication:
- United States
- Language:
- English
Similar Records
Borehole-inclusion stressmeter measurements in bedded salt
Overcoring and calibration of IRAD GAGE stressmeters at the Spent Fuel Test in Climax granite