Shaking Table Tests on Model Ground Simulating Constructions of Sand Compaction Piles －Difference of Behavior between Improved and Unimproved Ground－

Abstract

In this paper, using a sand pile driving equipment that simulates the actual Sand Compaction Pile (SCP) construction method, shaking table tests and cone penetration tests were conducted to confirm the improvement effect of penetration resistance, water pressure and settlement control by preparing the ground by compaction and focusing on the difference of infilling materials of sand piles. From the measurement results of sand pile driving, it was confirmed that the infilling materials used in this study did not affect the increase or decrease of soil pressure and excess pore water pressure during driving, and did not affect the penetration resistance as an improvement effect, i.e., liquefaction strength and the controlling effect of excess pore water pressure. Furthermore, through the shaking table test and the cone penetration test, it was found that the liquefaction strength and excess pore water pressure controlling effect of the improved soil were larger than those of the unimproved soil, even at the same relative density.