STATIC AND DYNAMIC ANALYSIS OF MELATI DAM

• Main Author: Ramadhan, Gumilar
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/81005
• Institution: Institut Teknologi Bandung

During the construction and operation of dams, dams can experience damages. One factor that can cause damage to a dam is an earthquake. If damage is not anticipated, it can cause failures which can result in material and life losses. To avoid this, good planning is needed before construction is carried out. The response of the dam, both in static and dynamic conditions, needs to be known to evaluate the safety of the dam design. Earthquake engineering deals with the effects of earthquakes on humans and their environment and methods to reduce these effects. In this research, an analysis of the static and dynamic response of the Melati Dam was carried out. The Melati Dam is planned to be a composite dam with a zoned fill dam on the left side and a roller-compacted concrete (RCC) dam on the right side. Static and dynamic response analysis was carried out on the embankment dam section. Static response analysis was carried out by modeling the in-situ conditions of the foundation, simulating dam construction, filling the dam reservoir, and dam operations for five years. Meanwhile, dynamic response analysis was carried out on nine earthquakes with three different earthquake sources. Static and dynamic analysis was carried out using the finite element method. Modeling of the dam construction simulation was carried out sequentially using 23 lifts with a height of two meters. At the end of construction, it was found that there was an oval-shaped settlement in the middle of the core with the largest value of 34 cm and a horizontal displacement of 8 cm towards the downstream side. Filling of the reservoir resulted in uplift with the highest value of 13.6 cm. Analysis of dam operations did not result in significant displacement. Stability level analysis produces very good safety factor values on the upstream and downstream sides, with safety factor values of 2,673 and 1,931. Based on the deaggregation analysis of the probabilistic seismic hazard results, controlling earthquake characteristics were obtained for Benioff zone, shallow crustal and megathrust earthquake sources. In this study, Patea, 1998 Honshu and 2004 Honshu earthquakes were used for the benioff zone earthquake sources, Darfield, Iwate and Tottori earthquakes for the shallow crustal earthquake sources, and 2011 Honshu and Tohoku earthquakes for stations IWT007 and IWT010 for the megathrust earthquake sources. The earthquake recordings then modified the spectral acceleration scaling to the peak ground acceleration from the uniform hazard spectra. In this research, dynamic analysis was carried out using the linear equivalent method. At the end of the earthquake there are indications of liquefaction throughout the model. Liquefaction analysis shows that the Darfield earthquake produced the widest distribution of liquefaction and the largest excess pore water. Stability analysis shows that on the upstream side the Darfield and Tottori earthquake models have a factor of safety value below 1. On the downstream side the entire model has a high factor of safety value. Deformation analysis shows that Darfield, Tottori, and Tohoku IWT007 station earthquake models produce high displacements. Comparison of various ground motion parameters shows that there is a linear and exponential correlation between displacement and increasing parameters. Correlation analysis shows that the parameters maximum velocity, sustained maximum velocity, and Housner intensity have high coefficient of determination values. Comparison of the spectral response from earthquake recordings shows that recordings with high spectral acceleration values in medium to high periods produce larger displacements compared to recordings with high spectral acceleration values in low periods. The combination of the intensity of ground motion and spectral response is the factor that influences the displacement and stability of the dam.