关键词: 海底隧道, FLAC3D 锚固模型, 加筋锈蚀, 锚固支护, 有限元强度折减, 劣化

Abstract:

According to the previous theoretical and test results,the effect of reinforced corrosion on the reinforce-ment deterioration of anchorage support structure is investigated based on the reinforcement model FLAC3D and theidea of finite- element strength reduction.The results show that both the deformation of surrounding rock- added boltsand the area of plastic zone increase with the evolution of reinforced corrosion of anchor bar,and that the conver-gence deformation at the springing line is more obvious,with its maximum corrosion- induced influence degree beingup to 56.7%. Moreover,it is found that both the bond force of anchorage body and the strength of anchor bar de-crease due to the corrosion and the corresponding deterioration effect on the former is more remarkable,and that themaximum corrosion- induced influence degrees on the axial stress of anchor bar and anchorage body respectivelyreach 11.6% and 18.6%.The research provides some references for analyzing the corrosion- induced reinforcementdeterioration of anchorage support structure of sub- sea tunnels.

Key words: subsea tunnel, reinforcement model FLAC3D, reinforced corrosion, anchorage support, finite- element strength reduction, deterioration