INVESTIGATION OF A TECHNIQUE FOR PLACING SAND IN THE NCEL PLAST SIMULATOR PIT.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
Pagination or Media Count:
A technique used in model foundation studies was slightly modified in an attempt to realize objectives. Basically the technique consists of dropping the sand through a perforated container, such as a sieve, from a fixed height. The testing program consisted of dropping sand through a container, having 12 inch diameter holes at 1-12 inches center-to-center, into a test box having a volume of 2.81 cubic feet. The fall height was varied in order to define the falld nsity curve for the particular sand presently used in the blast simulator pit. This sand has a uniformity coefficient of 2.7. The results of these tests indicate that a dry density of 104.5 pounds per cubic foot can be obtained by dropping the sand a distance of 36 inches. This is equivalent to a relative density of about 58 peraent. The results also indicate that very little segregation will occur using this method and that higher densities can be obtained by vibration after deposition. A concept is given for design of a prototype perforated container. Author