Earthmoving operations are a sizable and heavy portion of most civil construction projects.rnIt includes cyclic work, expensive fleet, and a large volume of works. Earthmoving operations arerndifficult to plan and operate because of their operation complexity, uncertainty in the operationrnprocess, and environment. Due to this fact, and as the earthmoving operation process is cyclic,rni.e., the events (activities) occur in a discretized manner. Therefore, Discrete-Event Simulationrn(DES) is found to be the most effective approach to analyze and model their improvementrnstrategies for their operational performance. The main objective of this thesis is thus to analyzernthe current earthmoving operation practice, develop the DES model, and develop improvementrnstrategies for the earthmoving operation production system. In this thesis, 421 field data instancesrnwere collected through observation from the sample road construction project. Out of this, 345 ofrnthe data instances were collected from the earthmoving operation process of selected materials.rnSimphony CYCLONE simulation software was used as a simulation tool. A detailed earthmovingrnoperation simulation model with various adaptation (or scenarios) based on the types of loadingrnequipment (loader and Excavator) and types of material (selected and crushed unbounded) isrndeveloped. The simulation experimentation and sensitivity analysis were performed to optimizernproduction rates and resources' utilization levels of the earthmoving operation processes.rnAccordingly, in the case of selected material operation, assigning ten trucks, single dozerrn(stockpiling), Excavator, and dozer (spreading) is more effective in production rate and resourcernutilization. Besides, there is no significant difference in production rate and utilization of thernresource between the overall and excluding the embankment work of retaining wall and boxrnculverts of selected material. Additionally, in crushed unbounded material operation, assigningrn27 trucks, two loaders, and a single grader is more effective.