Bener Dam diversion tunnel is located in two rock units such as andesite and andesite breccia. Based on the engineering geology investigation, the tunnel consist of andesite breccias with moderate and poor rock mass quality. 

Geological and engineering geology conditions are used as the basis for stability analysis of excavation methods and determining primary tunnel support systems. The stability analysis of the openings and tunnel supports was cariied out using and empirical and numerical method approach.

Session 1  Introduction 

• Introduction to tunnel engineering geology 
• Investigation of circumvention tunnels (engineering geology, geophysics and rock mechanics) 
• Groundwater Condition in tunnel excavation 
• Methods of excavation and primary support systems in tunnels 
• Instrumentation on tunnels  

Session 2  Modelling Overview 

• Combination of empirical and numerical analysis on tunnel excavation (drilling and blasting method) 
• Modeling with Plaxis 2D for Excavation Stability (static) 
• Dynamic seismic analysis in tunnels