Development of a Deep Hole Stress Measurement Devices
SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY DEPT OF MINING ENGINEERING
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A deep hole in situ stress measurement device has been designed, built and laboratory tested. he device is capable of measuring 9 components of strain in the side walls of 6-7 inch diameter boreholes in rock. It is designed to be used in boreholes up to 2500 meters deep at temperatures up to 100C and fluid pressures up to 250 bars. The instrument will be lowered into and retrieved from the borehole on a 7 conductor armored cable and is securely locked into position by double acting hydraulic jack above and below the measurement units. Hydraulic power to run the device comes from an intensifier, the low pressure end of which is driven by the ambient fluid pressure in the borehole. Electric power comes from a self-contained battery pack.
- Geology, Geochemistry and Mineralogy
- Test Facilities, Equipment and Methods