Establishing the relation between the compaction ratio (K) and field dynamic penetration tests (N10) for filling sand

Abstract

     This paper is aimed at establishing the relation between the compaction ratio (K) and field dynamic penetration test (N10) for fine sand filling. Based on the field dynamic penetration test with a uniformity coefficient of Cu ≤ 1.708, the compaction ratio K can be driven from the number of hammer drop of N10. The correlation equation between compaction ratio K and number of N10,t of the filling fine sand in the depth above ground water level is as 0.0293 * ln( ) 0.8619 10, K N t = + . The Correlation equation between compaction ratio K and number of N10,d of the filling fine sand in the depth below ground water level is as 0.0196 * ln(N10,d) 0.8308 10, K N d = + . Using of field dynamic penetration test to assess the average compaction ratio K of sand filling in depth instead of field density test has more advantages such as low testing cost, less testing time and conducting even in the submerged sand filling. This will overcome the difficulties which usually occur when the ground is submerged or short test time required