TY - GEN
T1 - Long-term behavior of the tunnel under the loads of consolidation and tunnel temperature
AU - Afshani, A.
AU - Li, W.
AU - Akagi, H.
AU - Shigeaki, O.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Tunnel excavated in low-permeability soil may experience large deformation and increase in lining load if water drains into the tunnel. Long-term dissipation of tunnelinginduced excess pore pressure into the tunnel consolidates soil around tunnel with low permeability and imposes extra load on the lining. Meanwhile, seasonal temperature can also expand and shrink joint opening between rings and segments and alters the rate of water leakage into the tunnel. The lining deformation can increase under the incremental increase of consolidation load, but it might also show fluctuating pattern because of the seasonal temperature. In this study, combined effect of long-term consolidation load and seasonal temperature load on the joint opening are discussed. An empirical relationship between water discharge into the tunnel and the amount of joint opening is proposed using the field measurements data of an old tunnel. Then, the joint opening under the influence of both consolidation and temperature load are investigated using a soil-water coupled consolidation model and a thermal stress model. The numerical results show that by employment of these numerical models, the behavior of joints between rings can be simulates very close to those of measured ones.
AB - Tunnel excavated in low-permeability soil may experience large deformation and increase in lining load if water drains into the tunnel. Long-term dissipation of tunnelinginduced excess pore pressure into the tunnel consolidates soil around tunnel with low permeability and imposes extra load on the lining. Meanwhile, seasonal temperature can also expand and shrink joint opening between rings and segments and alters the rate of water leakage into the tunnel. The lining deformation can increase under the incremental increase of consolidation load, but it might also show fluctuating pattern because of the seasonal temperature. In this study, combined effect of long-term consolidation load and seasonal temperature load on the joint opening are discussed. An empirical relationship between water discharge into the tunnel and the amount of joint opening is proposed using the field measurements data of an old tunnel. Then, the joint opening under the influence of both consolidation and temperature load are investigated using a soil-water coupled consolidation model and a thermal stress model. The numerical results show that by employment of these numerical models, the behavior of joints between rings can be simulates very close to those of measured ones.
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U2 - 10.1201/9780429424441-556
DO - 10.1201/9780429424441-556
M3 - Conference contribution
AN - SCOPUS:85068425808
SN - 9781138388659
T3 - Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art- Proceedings of the WTC 2019 ITA-AITES World Tunnel Congress
SP - 5254
EP - 5263
BT - Tunnels and Underground Cities
A2 - Viggiani, Giulia
A2 - Celestino, Tarcisio
A2 - Peila, Daniele
A2 - Viggiani, Giulia
PB - CRC Press/Balkema
T2 - World Tunnel Congress, WTC 2019 and the 45th General Assembly of the International Tunnelling and Underground Space Association, ITA-AITES 2019
Y2 - 3 May 2019 through 9 May 2019
ER -