BIAXIAL STRESS AND STRAIN MEASUREMENTS USING PHOTOELASTIC HOLLOW CYLINDER INCLUSION METERS.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
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It is shown that for a wide range of rock and concrete-like materials a glass stressmeter will enable the stresses to be determined directly without knowledge of the host material modulus. The results of tests using frozen sand slabs have shown that under uniaxial stress there is little effect of creep on the meter readings until excessive fracturing occurs. There is also close agreement between the theoretical and experimental values for the meter sensitivity when it is assumed that the Poissons ratio of the host materials falls to 0.5 during creep no volume change in stressed material during creep. Experiments are also described which show that the stress can be determined in a material which is creeping by inserting a stressmeter and measuring the final steady reading. It is shown that for a low modulus plastic inclusion the sensitivity is a function of the ratio of the moduli of the host and gauge materials except when the host material is undergoing continuous creep. The long term sensitivity is then again independent of these factors. Author
- Geology, Geochemistry and Mineralogy
- Test Facilities, Equipment and Methods