About the AuthorsChun'an Tang has a PhD in Mining Engineering and is a Professor atthe School of Civil & Hydraulic Engineering at Dalian University of Technology in China. Heis an advisor for design and stablity problem modellingin mining and civil rockengineeringand and Chairman of the China National Group of the International Society for Rock Mechanics.
John Hudsonis emeritus professor at Imperial College, London and is active as an independant consultant for Rock Engineering Consultants. He has a PhD in Rock Mechanics andcompletedover a 130rock engineering consulting assignments inmining and civil engineering. He is a fellow at the Royal Academy of Engineering in the UK and President of the International Society for Rock Mechanics.