The conduct of piled raft system in sandy soil exposed to vertical load by using dynamic load tests

The purpose of studying the behavior of a single pile in a group of piles or a piled raft system is to view the soil influence under the raft foundation and its resistance for a portion of the applied load. Several types of research also have studied this case in the laboratory by using strain gauges connected to piles which enabled them to study the behavior of every single pile separately. Therefore, what distinguishes this study from others is the ability to take the advantages of the dynamic tests PDA according to ASTM D 4945-08 and then use the CAPWAP program to analyze the results. Also, the mechanism has not been studied before by any of the researchers who have studied the piled raft system as they need more than one testing device at the same time. The dynamic testing of piles estimates the pile's power and movement under hammering influences with a system comprising of a reusable straining transducer, accelerometer, as well as a Pile Driving Analyzer (PDA). To evaluate the soil obstruction impacts, the deliberate information is dissected with the CAPWAP program which utilizes refined sign coordinating procedures. CAPWAP outcomes incorporate static resisting powers alongside the pile shaft (i.e., skin grinding), at the toe of the pile (i.e., end bearing), soil shaking along with damp values in friction and end bearing, as well as a simulative pile static testing (loading-motion chart). The loading share instrument among piles and raft could be examined in a good way by utilizing dynamic loading testing. Dynamical load testing demonstrated that the loading share for the piles against the complete loading limit of the piled raft equals (74.4, 72.5, and 70.1%) for the groups of the piled raft(2×2, five heaps and 2×3), individually. The contribution of the center pile of the five-pile group is 1.22 times that of the pile conveyed by the corner pile. On other hand, the contributing of the edge pile regarding (2×3) pile group equals 1.11 time that the pile conveyed by the corner heap. It was likewise inferred that the piles' skin friction is roughly 70% of the complete precast pile limit.