Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1985-01-22
1986-04-01
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
73794, 73807, G01N 300, G01N 308
Patent
active
045790035
ABSTRACT:
An instrument for testing earthen samples under triaxial load conditions includes an upwardly extending cylindrical housing with two access windows formed in the side thereof, and a transparent cylindrical sleeve adapted to be slidably received about the housing to seal the chamber within. A lower stage is supported on a laterally translatable bearing block, and connected to a double-acting horizontal hydraulic ram. An upper stage is disposed in superjacent opposition to the lower stage, and is connected to the lower end of a vertical hydraulic ram supported atop the housing. The stages include shallow sockets adapted to receive sample platens in vertical alignment with the vertical ram. The platens each include peripheral grooves adapted to be engaged by swing clamps extending from each stage. Each platen includes a filter stone portion adapted to contact a core sample disposed between the platens, with a fluid channel extending radially through each platen to the filter stone. The platens are assembled with the core sample therebetween, and a sleeve membrane is secured thereabout with O-rings. The sample assembly is evacuated, locked to the stages with the swing clamps, and connected through the fluid channels to a water source to saturate the samples. The sample is then compressively loaded by the vertical ram and cyclically driven by the horizontal ram to simulate triaxial loading. LVDT sensors measure strain in both axes to determine soil properties under actual load conditions.
REFERENCES:
patent: 3199341 (1965-08-01), Heuer et al.
patent: 3505860 (1970-04-01), Bishop et al.
patent: 3580334 (1971-05-01), Broussard et al.
patent: 3975950 (1976-08-01), Erdei
patent: 4149407 (1979-04-01), Strom et al.
Ciarlante Anthony V.
Cohen Howard
Zimmerman Harris
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