01340932

Component

https://doi.org/10.3141/2232-07

http://scholar.google.com...ller&publication_year=2011

This study explored the effect of hydraulic hysteresis on the resilient modulus (M sub r) of subgrade soils. For that purpose, suction-controlled M sub r tests were performed on compacted specimens along the primary drying and wetting and secondary drying and wetting paths. First, M sub r tests were performed continuously on the same sample at various suction values along all of the paths (drying, wetting, etc.). A relationship between M sub r and matric suction was obtained and identified as the resilient modulus characteristic curve (MRCC). MRCC results indicated that M sub r increased with suction along the drying curve. Results along the primary wetting curve indicated a higher M sub r than along primary drying and secondary drying curves. The second series of tests, referred to as virgin tests, were performed at suction values without subjecting the sample to previous M sub r testing. Results indicated that M sub r values were lower compared with results from the other type of test (i.e., with continuous M sub r testing), and that M sub r results were influenced by the continuous stress loading. However, M sub r values along the wetting curves were still higher than for the drying curves for these virgin tests and therefore indicated that results were also influenced by hydraulic hysteresis (i.e., cyclic suction stress loading). New models to predict the MRCC results during drying and wetting were proposed on the basis of the soil–water characteristic curve hysteresis. The models favorably predicted the drying and then the wetting results with the use of the soil–water characteristic curve at all stress levels.

01356761

11-3391

English

pp 68-75

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167451

Print

Figures (7) ; References (21) ; Tables (2)

Fine grained soils; Geotechnical engineering; Modulus of resilience; Soil suction; Soil water; Subgrade (Pavements); Wetting and drying tests

Matric suction; Soil water characteristic curve

Geotechnology; Highways; Pavements; I42: Soil Mechanics

TRIS, TRB, ATRI

Feb 17 2011 6:30PM

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