Vibration induced pore pressure development in graded sands Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6w924f56f

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  • During construction of the embankment at Blue River Dam placement difficulties were occasionally experienced with the filter zone sands. In the extreme condition construction equipment became mired and part of the fill had to be removed and wasted. A laboratory investigation was conducted on materials from the above project to determine the amount of fines (material passing a No. 200 U.S. Standard sieve) which could be permitted without development of these problems. It was reasoned the construction difficulties were due to the development of pore pressures in the sand and a subsequent loss of shear strength. In this investigation the field condition was simulated by vibrating a saturated sand sample under constant surface load and allowing the sample to drain to its top surface. During the period of vibratory loading pore pressures were measured at different depths in the sample. It was found that for a fines content greater than five percent relatively impermeable layers and excessive changes in pore pressures developed in the sample. It was concluded that these pressures were sufficient to cause construction difficulties. For a fines content less than five percent the pore pressure development was negligible. A guiding axiom for the placement of graded wet filter sand that states, "If it can be placed and compacted the fines are not detrimental and likewise if the fines are not excessive it can be placed and compacted" was further verified by this investigation.
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