Unstable behavior of segmental ring under various pressures and its discrete element simulation
| Autor: | Naotaka Kikkawa, Kazuya Itoh, Rolando P. Orense, Nobutaka Hiraoka |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Health
Toxicology and Mutagenesis Flow (psychology) Anisotropic pressure Ring (chemistry) 03 medical and health sciences 0302 clinical medicine Japan Pressure Accidents Occupational Humans 0501 psychology and cognitive sciences Slipping 050107 human factors Seabed Construction Industry 05 social sciences Isotropy Stress–strain curve TBM tunnel construction Public Health Environmental and Occupational Health Stress-strain relationship Mechanics 030210 environmental & occupational health Segmental ring Lubrication Original Article Discrete Element Simulation Equipment Failure Contact area Geology |
| Zdroj: | Industrial Health |
| ISSN: | 1880-8026 0019-8366 |
| Popis: | In February 2012, a serious accident which resulted in five fatalities happened during a TBM-tunnel construction under the seabed in Japan. The cause of the accident appeared to be due to the Key-segment slipping out of the segment ring by the thrusting tailskin (wire brushes) of the TBM into the segment ring. This resulted in the collapse of the rings, causing the seabed ground and seawater to flow into the tunnel. We investigated how thin and thick segments without any circumferential joints behave under isotropic and anisotropic pressures using small-scale physical model. In the model tests, pressures were applied to the surroundings of the segment rings and the strains at each segment were measured in order to evaluate the damage. In addition, cases where lubrication on the contact area between the K- and B-segments was present or not were investigated and their discrete element simulations were also conducted. |
| Databáze: | OpenAIRE |
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