DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0)
- Lawrence Berkeley National Laboratory
Directional Cooling-Induced Fracturing (DCIF) experiments were conducted on three rectangular Westerly granite blocks (width=depth=4.0", height=2.0") which were preheated to 200, 400, and 600 degree C to induce damage (microcracks) with varying degrees. Liquid nitrogen was poured in a small, 1"-diameter copper cup attached to the top of the sample, and the resulting acoustic emissions (AEs) and temperature changes on the surface of the sample were monitored. The experiments were conducted under one selected biaxial stress (5.8MPa). The obtained AEs were used to determine the microcracking source locations and amplitude, and the associated moment tensors. The onset time of the AEs was correlated with the cooling temperature, which was used to show that the temperature at the onset of microcracking is not affected significantly by the preexisting damage, compared to the impact of the stress in the sample. Included in this submission are the animations of the AE locations and graphics displaying the measured temperature-AE activity changes for samples with different degrees of microcrack damage.
- Research Organization:
- DOE Geothermal Data Repository; Lawrence Berkeley National Laboratory
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Program (EE-4G)
- Contributing Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- EE0009033
- OSTI ID:
- 1842336
- Report Number(s):
- 1362
- Availability:
- GDRHelp@ee.doe.gov
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Borehole Damage Effect
DCIF
Directional Cooling-Induced Fracturing
Granite
Westerly
Westerly Granite
accoustics
acoustic emission
biaxial stress
damage effect test
directional cooling induced fracturing
energy
failure test
fracture
geothermal
microcrack
processed data
raw data
stress
test
thermal fracture
thermal stress