Abstract Taking a river-crossing tunnel on Nanjing Metro Line 10 as an example, a discrete element simulation and model test were carried out to study the formation-damage-reformation process of the slurry membrane, the penetration range of slurry in a sandy cobble stratum, and the influence of shield tunnelling on the ambient environment under different slurry pressures. The results show that: the discrete element simulation method can reproduce well the dynamic process of the slurry membrane during slurry shield tunnelling, the selection of slurry pressure plays an important role in controlling stratum deformation and working face stability, and a permeable slurry membrane can be formed in sandy cobble stratum using a pure-cone shape with an oval outline and a largest gyration radius of 0.3D. Its largest penetration distance can be 0.4D~0.5D in front of the shield, and the range of the slurry membrane develops with tunnelling.
Abstract：
Taking a river-crossing tunnel on Nanjing Metro Line 10 as an example, a discrete element simulation and model test were carried out to study the formation-damage-reformation process of the slurry membrane, the penetration range of slurry in a sandy cobble stratum, and the influence of shield tunnelling on the ambient environment under different slurry pressures. The results show that: the discrete element simulation method can reproduce well the dynamic process of the slurry membrane during slurry shield tunnelling, the selection of slurry pressure plays an important role in controlling stratum deformation and working face stability, and a permeable slurry membrane can be formed in sandy cobble stratum using a pure-cone shape with an oval outline and a largest gyration radius of 0.3D. Its largest penetration distance can be 0.4D~0.5D in front of the shield, and the range of the slurry membrane develops with tunnelling.
WANG Jun,
He-Chuan,
Feng-Kun etc
.Research on the Dynamic Behavior of the Slurry Membrane of
a Large-Section Slurry Shield in a Sandy Cobble Stratum
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(6): 108-115
2014, Vol. 51 