Geosynthetics October/November 2019 - 22

Remediation of a uranium ore residues settling basin

3a

FIGURES 3a and 3b
Pond 4: a) aerial view
(April 2014) (Google
Earth); b) top view-
characterization
according to the
tailings properties

3b

FIGURE 4
Schematization of Pond
4 remediation work
concept (adapted from
Wismut GmbH website)

22

Geosynthetics | October November 2019

consolidated, the tailings located in the
central area under the free water level is
mainly very fine-grained material that
can be considered in a saturated and
unconsolidated state.
First, the removal of the surficial
water was carried out. Afterward, the
vertical drains were installed to enhance
the consolidation process and expel pore
water followed by the placement of the
drainage mineral layer that will serve
both as a working platform and as a surcharge load to enhance consolidation.
The installation of this layer is possible
thanks to the nonwoven layer acting as
separation and the two layers of geogrids
to enhance the load-bearing capacity and
improve load distribution. The schematization of the remediation concept for
Pond 4 is shown in Figure 4.
The expelled contaminated water was
then collected and treated. On top of the
drainage layer, a properly compacted
mineral sealing layer was installed followed by the cover soil layer.
In the outer edge regions, outside
the water profile, the subsoil in the bank
zone can be considered as dried. In this
area, favorable conditions with regard to
load-bearing capacity can be assumed.
Therefore, the trenches to anchor the
geogrid were built on this area. First,
the nonwoven fabric (E 250 K4) was
rolled out as a filter and separation layer.
Subsequently, the first geogrid layer (Base
40) was placed rotated 90° to the nonwoven direction. The overlap between
the different geogrid panels was at least
20 inches (50 cm). The next step was the
installation of the second geogrid layer
(Base 40) for load distribution rotated 90°
to the first geogrid position and parallel
to the lowest nonwoven. This method
enables forces from machineries to be
transferred in the longitudinal and transversal directions in a trench area so that
the overlap between the panels will not
be overstressed.



Geosynthetics October/November 2019

Table of Contents for the Digital Edition of Geosynthetics October/November 2019

Geosynthetics October/November 2019 - Cover1
Geosynthetics October/November 2019 - Cover2
Geosynthetics October/November 2019 - 1
Geosynthetics October/November 2019 - 2
Geosynthetics October/November 2019 - 3
Geosynthetics October/November 2019 - 4
Geosynthetics October/November 2019 - 5
Geosynthetics October/November 2019 - 6
Geosynthetics October/November 2019 - 7
Geosynthetics October/November 2019 - 8
Geosynthetics October/November 2019 - 9
Geosynthetics October/November 2019 - 10
Geosynthetics October/November 2019 - 11
Geosynthetics October/November 2019 - 12
Geosynthetics October/November 2019 - 13
Geosynthetics October/November 2019 - 14
Geosynthetics October/November 2019 - 15
Geosynthetics October/November 2019 - 16
Geosynthetics October/November 2019 - 17
Geosynthetics October/November 2019 - 18
Geosynthetics October/November 2019 - 19
Geosynthetics October/November 2019 - 20
Geosynthetics October/November 2019 - 21
Geosynthetics October/November 2019 - 22
Geosynthetics October/November 2019 - 23
Geosynthetics October/November 2019 - 24
Geosynthetics October/November 2019 - 25
Geosynthetics October/November 2019 - 26
Geosynthetics October/November 2019 - 27
Geosynthetics October/November 2019 - 28
Geosynthetics October/November 2019 - 29
Geosynthetics October/November 2019 - 30
Geosynthetics October/November 2019 - 31
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Geosynthetics October/November 2019 - 33
Geosynthetics October/November 2019 - 34
Geosynthetics October/November 2019 - 35
Geosynthetics October/November 2019 - 36
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Geosynthetics October/November 2019 - 40
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Geosynthetics October/November 2019 - 55
Geosynthetics October/November 2019 - 56
Geosynthetics October/November 2019 - Cover3
Geosynthetics October/November 2019 - Cover4
Geosynthetics October/November 2019 - Blank1
Geosynthetics October/November 2019 - GeoConf20_1
Geosynthetics October/November 2019 - GeoConf20_2
Geosynthetics October/November 2019 - GeoConf20_4
Geosynthetics October/November 2019 - GeoConf20_5
Geosynthetics October/November 2019 - GeoConf20_6
Geosynthetics October/November 2019 - GeoConf20_7
Geosynthetics October/November 2019 - GeoConf20_3
Geosynthetics October/November 2019 - GeoConf20_8
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