Relation between process of structure collapse and release of ground deformation energy

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06220
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Public Works Research Institute
• Principal Investigator: ISAGO NOBUHARU 国立研究開発法人土木研究所, 土木研究所(つくば中央研究所), 研究員 (10355878)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: トンネル / 地山 / 変状 / 外力 / 変形エネルギー

Outline of Final Research Achievements

Mountain road tunnels of approximately 10,000 tubes exist in Japan and all of them is not healthy situation. Some collapse modes are reported; the one is that the deformation of tunnel occurs over the middle to long time period such as the small cracks develop slowly and lead to the collapse with shearing cracks, and the other is that the collapse occurs suddenly at large scales by the acting load in short time period.
The behavior of tunnel structure was grasped by the measurement result at an actual site over several years and the collapse mode was also examined through the model test considering the process of loading and the difference of the material for reinforcement of tunnel in this study. The result indicated the possibility that the energy volume relating to tunnel deformation should be considered, as well as the relation of load and displacement of tunnel structure and its load-bearing capacity when the tunnel structure is designed.

Free Research Field

工学