- 作者: Chung-Jung Lee ; Bing-Ru Wu ; Shean-Yau Chiou
- 中文摘要: Tunnelling in soft soils may cause ground movements and damage to adjacent buildings and overlying facilities. Ground movements around a tunnel before and after collapse have been investigated by conducting a series of tests with centrifuge tunnel models. This paper briefly describes the test procedures undertaken and summarizes a comparison of test results and field measurements relevant to the analysis of the extent of surface and subsurface settlement troughs. The observed overload factor at collapse was well bounded by the theoretical upper bound and lower bound solutions for tunnels with cover-to-diameter ratios of from 0.5 to 4. The proposed collapse mechanism derived from the theoretical upper bound solution is consistent with that observed from the velocity fields of the model tests. The magnitude and extent of settlement troughs at different elevations under different values of ground loss for tunnels embedded at different depths are provided as well. It is suggested that these simple relationships can be usefully adopted by engineers for designing protective measures in buildings when considering the likely settlement of structures or substructures above a tunnel.
- 英文摘要: --
- 中文關鍵字: collapse mechanism, overload factor, surface settlement trough, subsurface settlement trough, tunnel
- 英文關鍵字: --