Relevance of partial saturation to the mechanical behavior of tuffs
Conference
·
OSTI ID:137464
In this paper, equivalent confining pressures are estimated for samples of tuff using an expression that relates capillary pressure and effective confining pressure to the saturation state of the pores. These confining pressures are compared to the pressures calculated from strain measurements during drying; the calculations use elasticity theory. It is found that stresses and strains are caused by capillary forces in certain partially saturated rocks. This phenomenon has a direct impact on experiments that rely on strain measurements to calculate a rock property. Specific problem areas are the performance of unconfined mechanical tests, calculation of elastic parameters from laboratory data on unjacketed samples, and determination of in situ stress by any method involving stress relaxation.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States); Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 137464
- Report Number(s):
- SAND--88-2521C; CONF-890628--10; ON: DE89010435
- Country of Publication:
- United States
- Language:
- English
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