Geosynthetics June/July 2019 - 20

Geogrid reinforced soil structures reach new heights

PROJECT HIGHLIGHTS
WV ROUTE 10 RSS
OWNER

West Virginia DOT
LOCATION

Lyburn, W.Va.
GENERAL CONTRACTOR

Vecellio & Grogan Inc.
DESIGN ENGINEER

Terracon Consultants Inc.
FASCIA SYSTEM

Welded wire form with TRM and
vegetative facing
GEOSYNTHETIC PRODUCTS

Maccaferri Uniaxial geogrids
Nonwoven geotextile
GEOSYNTHETICS MANUFACTURER

Maccaferri Inc.

FIGURE 7 Relocated WV Route 10 RSS cross section

FIGURE 8 Relocated WV Route 10 RSS facing detail
20

Geosynthetics | June July 2019

Relocated West Virginia Route 10:
Reinforced soil slope
The project consisted of construction of
an embankment for the relocated West
Virginia Route 10 over Laurel Branch
in Logan County, W.Va. The underlying
rock at the project location is comprised
of the Pennsylvanian-aged Kanawha
Formation of the Pottsville Series.
The Kanawha Formation is generally
described as consisting of sandstone
(approximately 50%), shale, siltstone
and coal. A subsurface investigation
showed presence of natural alluvial soil
and existing fill material consisting of
silty to clayey sand and gravel at the toe
of the proposed slope and within the
valley bottom.
An embankment consisting of an
MSE wall midslope or a 0.75H:1V RSS
were considered as alternative options.

Out of these two options, RSS was
selected by the West Virginia Department
of Transportation (WVDOT) as a feasible option due to the availability of
on-site reinforced fill material and other
considerations. The on-site soils consist of residual fine-grained to coarsegrained soils. Most of the embankment
material was obtained from excavating
on-site bedrock material and crushed
and screened to meet WVDOT standard material specifications. RSS was
proposed to extend from the top of the
roadway embankment to a height of
about 120 feet (36.6 m) at the deepest
portion of the valley. A select embankment fill was placed within the proposed
undercut up to an elevation of 720 feet
(219.5 m) with a front slope configuration of 1.5H:1V, as shown in Figure 7.
This configuration created an approximate 20- to 30-foot (6- to 9-m) wide
bench at the toe of the highest portion
of the RSS. A culvert that carries Laurel
Branch through the embankment was
constructed within the select embankment foundation material that is placed
to an elevation of 720 feet (219.5 m)
prior to construction of the RSS.
The computer program ReSSA 3.0
was used to design the reinforcement
of the slope for a minimum factor of



Geosynthetics June/July 2019

Table of Contents for the Digital Edition of Geosynthetics June/July 2019

Geosynthetics June/July 2019 - Cover1
Geosynthetics June/July 2019 - Cover2
Geosynthetics June/July 2019 - 1
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Geosynthetics June/July 2019 - Cover4
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