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|Title:||Three dimensional finite element modelling of a natm tunnel|
|Authors:||Yeo, C.H. |
Finite element method
Steel pipe umbrella
|Source:||Yeo, C.H.,Lee, F.H.,Hasegawa, O.,Suzuki, H.,Shinji, M.,Tan, S.C. (2009-06). Three dimensional finite element modelling of a natm tunnel. Geotechnical Engineering 40 (2) : 107-115. ScholarBank@NUS Repository.|
|Abstract:||In current geotechnical engineering practice, tunnelling is often designed using two-dimensional analysis. This paper uses the results from the simulation of a NATM tunnel using three-dimensional finite element method to illustrate how realistic three-dimensional analysis can contribute to tunnel construction by illuminating ground mechanisms which could not have been achieved using two-dimensional analysis. The finite element model was based on the construction of Fort Canning Tunnel, Singapore, which is an approximately 15m wide vehicular tunnel that has been constructed using NATM with applications of steel pipe umbrella method. The results show that although the unsupported gap is only 1 to 2m, the actual length of tunnel which requires support is often longer, owing to the finite time needed for the shotcrete to harden. Thus, the rate of hardening of the shotcrete affects both ground settlement and lining stresses. The contribution of the forepoling is to bridge the gap between the working face and the segment of tunnel wherein the shotcrete has hardened sufficiently. The effects of lining permeability and groundwater table were also illustrated.|
|Source Title:||Geotechnical Engineering|
|Appears in Collections:||Staff Publications|
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