Analysis of dynamic load tests on steel rails piles

摘要

This paper presents an analysis of dynamic load tests performed on steel rails piles (TR-68) at the Experimental Foundation Field of the Department of Geotechnics, Engineering School of Sao Carlos, University of Sao Paulo, Brazil. The piles have segments of 12 and 3m, welded according to NBR 8800/86, comprising a maximum driving length of 27m. The objective of this analysis is: To carry out a wide study of steel track pile bearing capacity; To validate a tool predicts in NBR 6122/96: the rebound Validate with the control method of driving piles and verify the utilization of the steel rails piles with structural element of foundation. The rebound measurements were performed with paper and pencil in eighteen piles and were analyzed by applying increasing energy level. The energy was applied by the gravity hammer falling of a drop heights of 0.2 - 0.4 - 0.6 - 0.8 - 1.0 - 1.2 and 1.5m. The bearing capacity of the piles, determined by extrapolations of mobilized resistance - displacement curves is compared with two load tests employing the We Driving Analyzer (PDA) and with one static load test on a representatives piles.