TY - GEN
T1 - Semi-analytical approach to estimate slurry penetration in highly permeable soils
AU - Wiendl, A.
AU - Fillibeck, J.
AU - Cudmani, R.
N1 - Publisher Copyright:
© 2023 The Author(s).
PY - 2023
Y1 - 2023
N2 - Bentonite slurries are commonly used for tunnel face stabilization during slurry shield tunneling. In highly permeable soils uncontrolled slurry flow into the adjacent soil can cause loss of support and ultimately lead to a collapse of the tunnel face. In this contribution, innovative slurry flow tests were carried out to investigate slurry penetration in coarse soils, considering the influence of the slurry, the soil and the applied fluid pressure. Experimentally, a clear correlation between the slurry penetration, fluid pressure, rheological properties of the slurry and permeability of the soil was observed. Based on the 1D-Navier-Stokes equation, a semi-analytical model to estimate the slurry penetration in coarse soil as a function of the characteristic shear resistance of the slurry determined with a rheometer, the soil permeability and the fluid pressure was derived. The experimental results indicate that using appropriate ben-tonite-filler mixtures slurry shields become feasible, even in very highly permeable soils.
AB - Bentonite slurries are commonly used for tunnel face stabilization during slurry shield tunneling. In highly permeable soils uncontrolled slurry flow into the adjacent soil can cause loss of support and ultimately lead to a collapse of the tunnel face. In this contribution, innovative slurry flow tests were carried out to investigate slurry penetration in coarse soils, considering the influence of the slurry, the soil and the applied fluid pressure. Experimentally, a clear correlation between the slurry penetration, fluid pressure, rheological properties of the slurry and permeability of the soil was observed. Based on the 1D-Navier-Stokes equation, a semi-analytical model to estimate the slurry penetration in coarse soil as a function of the characteristic shear resistance of the slurry determined with a rheometer, the soil permeability and the fluid pressure was derived. The experimental results indicate that using appropriate ben-tonite-filler mixtures slurry shields become feasible, even in very highly permeable soils.
UR - http://www.scopus.com/inward/record.url?scp=85160351054&partnerID=8YFLogxK
U2 - 10.1201/9781003348030-179
DO - 10.1201/9781003348030-179
M3 - Conference contribution
AN - SCOPUS:85160351054
SN - 9781003348030
T3 - Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World- Proceedings of the ITA-AITES World Tunnel Congress, WTC 2023
SP - 1502
EP - 1509
BT - Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World- Proceedings of the ITA-AITES World Tunnel Congress, WTC 2023
A2 - Anagnostou, Georgios
A2 - Benardos, Andreas
A2 - Marinos, Vassilis P.
PB - CRC Press/Balkema
T2 - ITA-AITES World Tunnel Congress, ITA-AITES WTC 2023 and the 49th General Assembly of the International Tunnelling and Underground Association, 2023
Y2 - 12 May 2023 through 18 May 2023
ER -