Shields
River Road Flexible Pavement Design –
USFS Region 1
Wilsall, Montana
The project included 5-miles of existing
gravel roadway to be widened and partially paved. Our scope of work
included pavement section design, foundation recommendations for two
bridges and two culvert crossings, and general recommendations
regarding constructed slopes throughout the project. The road
investigation consisted of over twenty borings along the existing
roadway using the Orion drill rig. The first 1.5-miles was
characterized by wetland-type conditions, including standing surface
water and a thick surficial layer of plastic organic silt. Our
pavement section design within the wetland area was governed by
frost-heave mitigation requirements. Frost-heave section requirements
included the use of geogrid as a stabilization measure, and
construction of a capillary-break filter to prevent the formation of
ice lenses. Differential settlement due to embankment loading was
evaluated where soft subgrade was present. Submittals included three
separate road section designs, and full material specifications.
Products Terminal Concrete Pavement Design –
Conoco Phillips
Missoula, MT
Project included construction of a
concrete pavement approach and loading area, for a petroleum products
terminal. Subsurface conditions included high groundwater and soft
clay. Design challenges included extremely large traffic loadings,
frost susceptible soils, high groundwater, and soft subgrade. Concrete
pavement design considered non-reinforced sections with doweled joints
for load transfer. Concrete design details included transverse and
longitudinal construction and contraction joints, expansion joints,
water drainage, dowel size and spacing, and transition details for an
adjacent asphalt access road.
