The shield
tunneling in high water pressure (0.4~0.8 MPa) when crossing the rivers in
China is monopolized by imported shield tail sealing grease. Through orthogonal
studies, the interaction of the sealing grease′s
components is investigated to address this issue. The findings reveal the
following: (1) By introducing a thickening rheological agent, the formula
creates a lamellar structure with layers spaced 5~10 nm apart, giving base oil
and polyisobutylene access space. This allows for the realization of thickening
and dispersion, improves the shear rheology of shield tail sealing grease under
high water pressure, and ensures the balance between consistency and
pumpability. (2) By adding various scales of naturally degradable fibers and
other ingredients to the formula, a composite reinforced water resistance
structure is created, resulting in 7 MPa water breakdown pressure of highwatertightness pressure sealing grease, which is 1.75 times as much as
the imported product. As a result, the reasonable consistency, and pumpability
of shield tail sealing grease are achieved, and the water tightness is also
significantly improved. It has laid a solid foundation for the further
research, development, and transformation of highend
shield tail sealing grease for shields in high water pressure and complex
strata such as river crossings in China.
WANG Deqian
,
SI Fangfang
,
XIE Yufei
,
LI Bo
,
WANG Mingjie
,
JIAO Wenjie
,
JIA Hengqiong
,
LIAO Jianping
. Property Characterization of Shield Tail Sealing
Grease for High Water Pressure[J]. Tunnel Construction, 2022
, 42(8)
: 1386
-1394
.
DOI: 10.3973/j.issn.2096-4498.2022.08.007
