Analysis of Rock Support Performance for Tunnelling in Weakness Zones Containing Swelling Clay

摘要: Tunneling in weakness zones containing swelling clay represents one of the most difficult conditions hard rock tunneling. Evaluation support requirements such is normally empirical, i.e. mainly based on experience. In this paper, supports a major zone analysed monitoring results and numerical analysis order to enrich experience evaluation under conditions. The Finnfast subsea road tunnel used as case. Laboratory tests gouge material from actual indicate that pressure moderate. All instrumentation data simulation show loading sprayed concrete far less than its compressive strength, even for without reinforced rib. This suggests may often be excessively supported when not very active. It also found reliable stability control through should installed close excavation face possible. (C) 2011 Elsevier Ltd. rights reserved.