Seismic design of man-made high slope and its interaction with skewed oriented box culvert

The development of Kediri airport has several engineering challenges. Due totopographical constraints and limited acquired land for the development, it is necessary to build slopes up to 26 meters high. A large RC box culvert with skewed portal orientation penetrated the slope at one location. This paper discusses the seismic design of the slope with ground improvement at the base and its interaction with the skewed-oriented box culvert. Ground improvement in the form of RC drilled bored piles and cement-fly ash-gravel is required. Numerical modeling approach with dynamic analysis was performed using FEM, based on the tectonic setting of the site and earthquake source mechanism.Selection, modification, and post-processing of the ground motion time series were conducted to provide hazard-consistent input for dynamic ground response analysis. Considering The FE program limitations on the number of input steps, post-processing using truncation and time-step adjustment were required which were carefully performed so that various important characteristics of the original motion, including Arias Intensity and acceleration response spectrum, can be reasonably preserved.The analysis and design of the box culvert are also discussed, where its interaction and the skewed orientation to the slope create a complex challenge and require in-depth analysis and 3-D modeling.