To solve the
problem of crystalline blockage of tunnel geotextiles, an indoor model test is
conducted, and the onsite geotextile samples and test
samples are analyzed using SEM scanning electron microscope. Furthermore, the
bonding method between the crystal microscopic morphology and the geotextile is
investigated. The influence of geotextile material, geotextile mass per unit
area, and geotextile placement slope on crystallization blockage is as follows:
(1) Under 9 working conditions, the crystallization rate in the first 7 days of
the test is 2.4 times faster than the rest of the cycle, and then decreases in
different degrees; under the same geotextile material conditions, the
crystallization rate of the 500 g/m2 geotextile is 99%
and 37% faster than that of the 300 g/m2 and 400 g/m2 geotextiles. (2) When the unit area mass of the geotextile is
equal, the surface crystallinity of the composite geotextile is less than that
of the filament geotextile and the staple fiber geotextile; when the mass per
unit area increases to 500 g/m2, the surface
crystallinity of the filament geotextile exceeds that of the other two
geotextiles. (3) Under the conditions of the same quality and material per unit
area, when placed with a slope of 0° (dome position),
the crystallization amount of filament, staple fiber, and composite geotextile
is the largest, which are 153.09, 203.97, and 63.67 g, respectively; when
placed with a slope of 90° (the arch foot position),
the crystalline amounts of filament, staple fiber and composite geotextile are
59.44, 71.43, and 25.35 g, respectively, indicating that the test slope will
affect the crystallization of the geotextile. The smaller the placed slope, the
faster the crystallization rate.
ZHANG Xuefu
,
WANG Cheng
,
XIAO Yuhan
,
LIU Shiyang
,
CHEN Xiangge
. Laboratory Test Research on Crystallization of
Geotextiles for Tunnel Drainage System[J]. Tunnel Construction, 2022
, 42(S2)
: 59
-68
.
DOI: 10.3973/j.issn.2096-4498.2022.S2.009
