Dynamic analysis of anchored bored pile shoring systems in clayey soil

Recently developed projects in the construction industry mainly include deep excavation and excavation support structure systems due to space requirements. The design of excavation support structure systems for deep excavations is one of the main topics of geotechnical engineering today. In this study, numerical studies were carried out with the data obtained from ground survey reports prepared by drillings and geophysical scans taken from 3 different regions in Çiftlikköy district of Yalova province, and a general ground profile was created with geotechnical parameters. A permanent excavation support structure system with anchored bored piles was designed with the parameters obtained from empirical analyzes of this soil profile. Using the Plaxis V.20 (Finite element code for soil and rock analyses) program, which is a computer software based on the finite element method, this excavation support structure was first analyzed in a static condition without earthquakes. Then, dynamic analyzes were carried out using the static equivalent calculation method at the Method-1 DD-2 earthquake level, the static equivalent calculation method at the 1st Stage DD-2a earthquake level in Method-2, and the time interval calculation method at the 2nd Stage DD-2 earthquake level. In modeling this permanent support structure system, the displacement and cross-section effects occurring in the piles, anchor ropes and anchor roots, which are the structural elements of the system, were compared with the safety number of the system, Gs, in both methods. While designing a permanent support system within the scope of this study, it is seen that working with real earthquake data is very important to ensure that the system suffers less damage against rollover. However, in regions where design accelerations are high, it has been observed that the analysis made with the static equivalent calculation method by taking r = 1.5 at the DD-2 earthquake level is a solution that can yield much faster results than the analyzes made with the time domain calculation method.