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with a thickness of 600mm for filtration and drainage. The backfill of silty clay
was reinforced by woven geotextile (Li Changlin and Chen Guanqing, 1992).
4.3 Reinforced Earth Abutment
The Anhui grade separation bridge located in Beijing is composed of 19 bridges,
which include 8 round bridges with a height of 2.5
3.0 m. Because the spans of
bridges are very long and the soft ground with high groundwater level can't bear
the gravity wall, the 16 abutments of round bridges are geotextile reinforced earth
walls.
,
4.3.1 Departed Structure
The geotextile reinforced earth with wrapped face was departed from full-high
concrete facing and was connected to each other by webs. There was a vertical
sand cushion with a thickness of 250mm between the soft and rigid faces. The
reinforced earth (silty clay) was compacted to at least 95%m of g dmax . The
woven geotextile with a tensile strength of 25 kN/m and elongation of 18% was
used as reinforcement with a vertical space of 250mm. An eccentric load from
bridge beams applied the concrete block on the crest of reinforced earth. In order to
prevent the differential settlement, anchor rods and blocks were used (see Fig. 14).
4.3.2 Monitoring
The strain gauges were adhered on the webs and the displacement gauges were
attached on the outside face of concrete plates. The readings showed that the
webs or rigid faceplates bore about one fifth of the earth pressure. When these
Figure 14 Reinforced earth abutment.
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