271117 Techtonic GeoTech Cooroy Mtn Rd

Mr Ken Freeman                                                                               17385-001-Rev0
                                                                                           27 November 2017

5.4     Footing Design
There are several structures proposed , with differing founding specifications recommended for each. These
are given below in Table 5.
 Table 5: Footing Design Details

                            Suitable Foundation Type           Target Foundation          Allowable Bearing
      Renovation element                                             Material                 Capacity




      Proposed Carport      High Level – Strip/pad/post    Into very stiff clay               150 kPa
                                     footing            approximately 0.5 m BGL




                                                             Into medium dense silty
Proposed Porte Cochere High Levelfooting
                                  - Strip/pad/post             sand / very stiff clay         150 kPa
                                                            approximately 0.5 m BGL




                               High Level - Strip/pad        Into medium dense silty
      Proposed Garage                 footing                         sand                    150 kPa
                                                            approximately 0.5 m BGL




Proposed retaining walls Reinforced concrete bored Socket  minimum 1.0 m into
                                                    natural very stiff or hard          End bearing: 400 kPa
    north of house                 piles               silty clay below fill
 supporting fill platform                                                                Shaft friction: 30kPa
                                                    approximately 3 m BGL




                                                   Socket minimum 1.0 m into
  Possible Future Two                                moderately weathered,
Storey Extension, Pool,  Reinforced concrete bored   very low strength rock             End bearing: 1 MPa
and associated retaining piles, or mass excavated Approximately 1.5 m below
                                pad footings          existing ground level             Shaft friction: 90kPa
         walls                                     (depths may vary following
                                                           earthworks)




Foundation excavations must be inspected by a suitably qualified geotechnical engineer prior to placing steel
and pouring concrete.

Footing design must also account for potential soil reactivity, which was previously assessed as Class M by
Bowler.




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