TY - JOUR
T1 - Critical face pressure and backfill pressure in shield TBM tunneling on soft ground
AU - Kim, Kiseok
AU - Oh, Juyoung
AU - Lee, Hyobum
AU - Kim, Dongku
AU - Choi, Hangseok
N1 - Funding Information:
The authors appreciate the support partially by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport of the Korean government (No. 13SCIP-B066321-01) and (No. 16SCIP-B108153-02).
PY - 2018/6/30
Y1 - 2018/6/30
N2 - The most important issue during shield TBM tunneling in soft ground formations is to appropriately control ground surface settlement. Among various operational conditions in shield TBM tunneling, the face pressure and backfill pressure should be the most important and immediate measure to restrain surface settlement during excavation. In this paper, a 3-D hydro-mechanical coupled FE model is developed to numerically simulate the entire process of shield TBM tunneling, which is verified by comparing with real field measurements of ground surface settlement. The effect of permeability and stiffness of ground formations on tunneling-induced surface settlement was discussed in the parametric study. An increase in the face pressure and backfill pressure does not always lead to a decrease in surface settlement, but there are the critical face pressure and backfill pressure. In addition, considering the relatively low permeability of ground formations, the surface settlement consists of two parts, i.e., immediate settlement and consolidation settlement, which shows a distinct settlement behavior to each other.
AB - The most important issue during shield TBM tunneling in soft ground formations is to appropriately control ground surface settlement. Among various operational conditions in shield TBM tunneling, the face pressure and backfill pressure should be the most important and immediate measure to restrain surface settlement during excavation. In this paper, a 3-D hydro-mechanical coupled FE model is developed to numerically simulate the entire process of shield TBM tunneling, which is verified by comparing with real field measurements of ground surface settlement. The effect of permeability and stiffness of ground formations on tunneling-induced surface settlement was discussed in the parametric study. An increase in the face pressure and backfill pressure does not always lead to a decrease in surface settlement, but there are the critical face pressure and backfill pressure. In addition, considering the relatively low permeability of ground formations, the surface settlement consists of two parts, i.e., immediate settlement and consolidation settlement, which shows a distinct settlement behavior to each other.
KW - Backfill pressure
KW - Consolidation
KW - Face pressure
KW - TBM
KW - Tunneling
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U2 - 10.12989/gae.2018.15.3.823
DO - 10.12989/gae.2018.15.3.823
M3 - Article
AN - SCOPUS:85050373587
VL - 15
SP - 823
EP - 831
JO - Geomechanics and Engineering
JF - Geomechanics and Engineering
SN - 2005-307X
IS - 3
ER -