1 hooked plate to retain cellular facing 2 cellular facing 1 filled with topsoil and seeded 3 hollow bar soil nail Figure A 10 Example of bearing plate retaining geogrid facing with additional cellular facing for top soiling 1 Geoweb 174 or Krismer 3D 174 are examples of suitable products available commercially
In this dialog we define the shotcrete facing parameters thickness rebar sizes rebar spacings and materials and we can also select a plate section for the soil nail head plates Define Analysis Options Figure Analysis Options in the SnailPlus Wizard In the last Wizard tab we can define the analysis options
In this example we will design a soil nail wall 70 deg from horizontal with 5 rows of soil nails Tables 1 and 2 present the soil properties and the stratigraphy respectively Tables 3 and 4 present the soil nail and the Shotcrete facing properties respectively Figure Project model Table 1 Soil properties
Nail Spacing impacts the loading on the soil nails For clay soils use a tighter spacing Horizontal Spacing 3 0 – 4 5 Vertical Spacing 3 0 – 4 0 Top of Wall Bottom of Wall Top Nail within 2 5 of Top of Wall Bottom Nail within 3 0 of Bottom of Wall Soil Nail Basics 10 Head Strength
the soil nail wall system The following information is to be shown on the Plans 1 Plan location of the soil nail wall 2 Elevation view of the soil nail wall including payment limits 3 Typical section of the soil nail wall 4 Existing and final grade profiles in front of and behind the wall 5
facing bricks floors openings and facades pillars and walls steel sections aggregates aggregates in bulk aggregates in big bag aggregates in bags roof timber miscellaneous boards timber pre assembled wood roof structure accessories thatch roof covering tiles clay roof tiles shingles concrete roof tiles slate range common roofing accessories under shingle
Soil Nail Systems The wall facing is constructed by embedding steel nail head plates into lightly reinforced shotcrete Vertical drainage strips placed on the excavated soil face ensure drainage and prevent build up of hydrostatic pressures on the wall Shotcrete is placed directly against excavated soil face covering drain strips and encasing steel mesh or bar reinforcing and
SUMMARY Soil Nail Walls are currently the most commonly used wall type in cut situations There are a variety of different facing options which are cast in place precast panels sculpted shotcrete and either smooth or rough shotcrete Which is best for a project depends upon several factors including location aesthetic surroundings and cost
A 3 Examples of facing systems used in a soil nail structure A 3 1 Hard facing The combination of soil nails and facing has to fulfil the function of stabilising the slope between the nails and shall therefore be dimensioned to sustain the expected maximum destabilising forces Examples of hard facing methods are shown in Figures A 6 and A 7
2019 09 23 nbsp 0183 32 Though several options exist for stabilizing your ground soil nailing is one of the standard options The procedure involves the drilling of holes for the insertion of bars known as soil nails The popularity of soil nailing among drilling contractors for ground stabilization arises from its flexibility inexpensiveness and ability to be used in places with restricted access Soil
2021 09 09 nbsp 0183 32 The facing design of soil nail walls against flexure punching shear and headed stud tensile limit states has been rarely studied within the reliability based design framework This study presents reliability analyses of both temporary and permanent soil nail walls against facing limit states using the default and improved Federal Highway Administration FHWA
5 6 4 Soil nail Head 46 5 6 5 Slope Facing 48 5 7 ANALYTICAL DESIGN OF SOIL NAILS IN RETAINING WALLS 50 5 7 1 General 50 5 7 2 Factor of Safety 51 5 7 3 Soil nail Reinforcement 52 5 7 4 Soil nail Head and Facing 52 5 8 ANALYTICAL DESIGN OF SOIL NAILS IN FILL SLOPES 56 5 8 1 General 56
The facing details for permanent soil nail walls are left to the Designer All appropriate item numbers should be identified for the permanent facing components as they are not included under the Basis of Payment in the soil nail specification The details should include 1 Connection of the permanent facing to the construction face of the soil nailed wall system 2
SOIL NAIL WALLS FACING OPTIONS AND SEISMIC EFFECTS A TEMPORARY PERMANENT SHOTCRETE FACINGS MODEL WIZARD SnailPlus In the SnailPlus Model Wizard we can select the option to use Two Stage Facing The software will automatically use the temporary facing in all stages and only at the last it will apply the permanent
In many cases soil nails are used in conjunction with shotcrete facing although other facing options can be utilized by GeoBuild depending on the project requirements Soil Nails for All Conditions GeoBuild utilizes soil nails in a wide variety of soil conditions If the soil is stable we utilize open drilling methods and solid bars However in collapsible soils we can use
Soil nail walls are typically equivalent in cost or more cost effective than ground anchor walls when conventional soil nailing construction procedures are used Shotcrete facing is typically less costly than the structural facing required for other wall systems Soil nail disadvantages Some of the potential disadvantages of soil nail walls are
Use of flexible facing material such as geosynthetic steel wire mesh or chain link without shotcretecould provide significant savings In recent years alternative forms of facing support for soil nail supported slopes have been used including steel wire mesh which has been successfully applied in Europe
Soil Nail Walls FHWA SA 96 069R and Soil Nailing Field Inspectors Manual FHWA SA 93 068 nature and have used shotcrete for the structural facing The highest vertical soil nail wall in France is 22 meters high at Montpelier The highest battered soil nail wall 73 degree face angle is almost 30 meters high Dombes tunnel portal near Lyon In Germany over 500
soil MSE gravity walls use strips bars or mats of steel or polymeric reinforcement to reinforce the soil and create a reinforced soil block behind the face The reinforced soil block then acts as a unit and resists the lateral soil loads through the dead weight of the reinforced mass MSE walls may be constructed as fill walls with fill and reinforcement placed in alternate layers to
Facing Shotcrete – Facing consists of an initial and a final component Soon after excavation the initial facing is applied on the exposed soil at each excavation lift before or after nail installation to provide temporary stability and protection The initial
Soil nails are generally used in conjunction with a steel grid cover and shotcrete facing for ground support in advance of retaining wall construction Soil nail wall design and construction must take into account seismic activity external loads hydrostatic and wind forces drainage frost penetration and aesthetics Soil nails are
SnailPlus 2021 is the latest version of our soil nail walls design software The software upgrades in comparison to older versions include Update to AASHTO LRFD 9 th edition 2020 2018 Inclusion of Washington State DOT code options LRFD WSDOT 2019 Improvement of automatic search algorithm Addition of trilinear search methods