To study the effectiveness of the treatment method of
soaking mud cake in a dispersant solution and the disintegration
characteristics of cutterhead mud cake, undisturbed mud cake from the soft rock
portion of the shield section of the Shenzhen railway transit line 13 is made
into several samples with different sizes. A laboratory disintegration test is
conducted on the mud cake samples under different test conditions using a self-improved
disintegrator. The influence of the dispersant solution, solution volume
fraction, mud cake site, initial water content, and dry-wet cycle on the disintegration characteristics of the mud cake is
analyzed. The test results show the following: (1) Mud cake disintegration
mainly goes through three stages, i.e., initiation, development, and
stabilization. (2) The effect of the dispersant solution on the mud cake is
adaptive in nature and is related to the concentration of the solution.
Furthermore, the concentration of the solution on the promotion of the
disintegration has a specific threshold. (3) The mud cake scale is related to
dispersant treatment. (4) The initial water content of the mud cake has a
significant influence on its disintegration characteristics. For mud cake
having high moisture content, it is suggested to take necessary measures to
reduce the initial water content to 5% or less according to the field
application effect. (5) Dry-wet cycle can accelerate
the destruction of the internal structure of the mud cake. The difficulty in
processing mud cake can be reduced after three iterations of the dry-wet cycle.
WEI Lifeng
,
YE Laibin
,
HUANG Jizheng
,
LIU Pengcheng
,
FANG Yong
. Disintegration Characteristics of Mud Cake on Shield Cutterhead
in Cohesive Strata[J]. Tunnel Construction, 2022
, 42(2)
: 275
-282
.
DOI: 10.3973/j.issn.2096-4498.2022.02.013
