A New Method to Predict Ratio of Width to Height Rock Pillar in Twin Circular Tunnels

Asghar Siahmansouri^1*, Javad Gholamnejad² and Mohammad Fatehi Marji³

¹M.Sc. Student, Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran

²Associate Professor, Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran

³Associate Professor, Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran

^*Corresponding Author: Asghar Siahmansouri, M.Sc. student, Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran Email: