When slurry shield tunneling in the cohesive soil
layer, muck cake on cutterhead would cause the decrease of tool cutting ability,
and the muck stagnation would lower shield tunneling efficiency. Accordingly, a
case study is conducted on the slurry shield tunneling of the supporting
project of Beijing SouthtoNorth
water diversion project. Based on the shield tunneling parameters in the waterrich sandypebble and clay mixing strata and
the formation lithology variation trend, the specific performance of the
cutterhead mud cake is analyzed, and the ratio of cutterhead torque to
penetration degree and that of thrust to penetration degree are taken as the
indexes to judge mud cake formation. Finally, the mud cake soaking tests in
hydrogen peroxide, types Ⅰ and Ⅱ dispersants are employed. The results show that the type Ⅱ dispersant has a better effect and is selected for the cutterhead
treatment, which can effectively soften the mud cake and guarantee the smooth
shield tunneling.
LIU Hongzhi, LI Hui, ZHAO Liang, GAN Congyu, LONG Wenxuan
. Mud Cake Disposal Technology for Slurry Shield Tunneling
in SandyPebble and Clay Mixed Strata[J]. Tunnel Construction, 2022
, 42(S1)
: 442
-448
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.052
