Geoscience Reference
In-Depth Information
2.4 Full-Scale Test Study on Frost Heave of Retaining Wall
Reinforced with Geotextile
In the irrigation Area Inner Mongolia Autonomous Region, China, a full-scale
test on frost heave of a 2-m-high retaining wall reinforced with geotextile was
conducted. In this area, the irrigation system is relatively developed and the
irrigation canal forms a dense network. The groundwater table is high in autumn
and decreases slowly in winter, with nearly the same rate as that of frost depth
penetration. The small and relatively invariant distance between frost penetration
and the groundwater table leads to the serious frost damage in hydraulic retaining
walls.
The full-scale test wall reinforced with geotextile was southbank of the
irrigation canal. The facing panel was made up of reinforced light precast
concrete slabs. The retaining wall with a height of 2 m consisted of five geotextile
reinforcement layers, each approximately 0.4m in height. The facing panel was
made up of reinforced light precast concrete slabs. The horizontal displacement
of the facing panel, the strain of geotextile, and the soil temperature and moisture
content were measured during the winter of 1993-1994. Figure 7 shows the
schematic diagram of the wall and the measured points on the geotextile.
The test results indicated that the displacement of the facing panel is
comprised of the horizontal frost heave of frozen soil and the compressive
deformation of unfrozen soil in backfill. It can be observed from
Fig. 8
that in the
0-300-mm range from the facing panel, horizontal frost heave occurred; in the
300-900-mm range from the facing panel, the soil was compressed before
freezing and then was heaved after freezing; outside that zone the soil was always
compressed. Therefore, the horizontal frost heave of backfill was 15-30mm,
while the horizontal displacement of the facing panel measured only 6mm,
Figure 7
Cross section.
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