Stability Analysis and Support System Design of Penstock Tunnels Bifurcation with Headrace Tunnel of Rudbare-Lorestan Dam Project

Hossein Behzadinejad; Lohrasb Faramarzi^*; Mohammad Darbor

Department of Mining Engineering, Isfahan University of Technology, Iran

Doi:10.29252/ANM.7.13.113

Abstract

In this research, stability of penstock tunnels bifurcation with headrace tunnel of Rudbare-Lorestan dam powerhouse was studied. Due to the weak rock masses at the bifurcation area, the numerical modeling using FLAC3D was performed. According to the results of numerical modeling and determination of plastic zone and the empirical methods, the temporary support system consists of shotcrete and rock bolt with adequate length are suggested. Based on laboratory and in situ tests, the geomechanical parameters are determined.

Keywords: Penstock Tunnels; Geomechanical parameters;  Numerical simulation;  Plastic zone;  Temporary support system