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Title: The effects of cyclic triaxial testing techniques on the liquefaction behavior of Monterey No. 0 sand
Authors: Mulilis, John P. (John Paul)
Horz, Raymond C.
Townsend, Frank C.
Keywords: Cyclic triaxial compression tests
Soil tests
Soil testing
Soil mechanics
Soil liquefaction
Monterey No. 0 sand
Soil strength
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: The objectives of this investigation were to (A.) participate in a cooperative cyclic triaxial testing program with seven other laboratories and (B.) determine the effect of various testing techniques and equipment, .i.e., specimen preparation and compaction, B value, density, loading wave form, and compaction equipment on the cyclic triaxial strength of a sand. A total of 28 saturated isotropically consolidated-undrained cyclic triaxial tests were conducted on 2.8-in.-diam by 7-in.-high specimens of Monterey No. 0 sand. Specimens were compacted to 60 percent relative density (98.5 pcf) using three different compaction techniques (i.e. dry rodding, moist rodding, and moist tamping) with some instances of undercompacting the lower layers. Some specimens were compacted to a relative density of about 66 percent while others were tested when the B value reached approximately 0.91. The effect of loading wave shape was evaluated by subjecting specimens to either a rectangular, near triangular, or sinusoidal loading wave form. It was found that if careful attention was given to testing details, good agreement could be obtained by different testing laboratories. The test results also demonstrated that the cyclic triaxial strength is greatly.influenced by the method of specimen compaction, density, and shape of loading wave. Specimens prepared moist, either rodded or tamped, were 38-58 percent stronger than comparable specimens compacted dry to the same relative density. A 12 percent increase in the relative density was sufficient to cause an increase in strength of approximately 22-30 percent. Furthermore, the severity of loading wave form on the cyclic triaxial strength was found to decrease in the following order: square, nearly triangular, and sine, with strength differences of 13 to 30 percent being due to the loading wave shape. The test results also showed that for this sand, changing the diameter of the compaction foot, decreasing the molding water content from 12.8 to 8.0 percent, or testing specimens with a B value of 0.98 or 0.91 had no significant effect on the cyclic triaxial strength of specimens.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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