Reference document Geotech Investigation · MCU22/0087.01

                                                           PROPOSED UNIT DEVELOPMENT
                                                           37 BOTTLEBRUSH AVENUE, NOOSA HEADS

            To replicate future landscaping, a surcharge load of 5 kPa has been applied upslope of the proposed
            building. Although building loads were not available at the time of reporting; a gross building load of 30 kPa
            has been applied to areas of the building likely founded using high-level footings. Other areas will be
            supported by piled foundations in the underlying medium dense (or denser) natural sands.
            Soil shear strength was based upon effective parameters which were estimated based on our interpretation
            of the subsurface investigation results, while also considering the values recommended for similar materials
            in Appendix D of Australian Standard AS4678-2002 Earth Retaining Structures. Adopted soil parameters
            are shown on the Slope/W output presented in Text Figure 9. Analysis was undertaken for a specified range
            of entry and exit points that could impact the proposed development.

            The analysed profile represents the critical section for the proposed development, which covers the deepest
            proposed cut. Our analysis indicates that stability of the site hinges on the temporary and permanent
            retention systems. Provided that those walls/structures are adequately designed and constructed the
            proposed development will achieve at least the required minimum FOS for long-term stability (i.e. >1.5).

            It should be noted that this modelling addresses the global stability of the proposed works; however, the
            stability of the retaining walls must be addressed by others as part of detailed design.




                                                                                     1.9
                                                                                                                                             5 kPa Surcharge




                                                                                           30 kPa Surcharge




                  0                             10                              20                             30                              40                    50
                                                                                           Distance (m)
                M aterial s
                                        Name: Very Loose/Loose Sand         Uni t Wei ght: 18 kN/m³    Cohesion': 0 kPa       Phi ': 30 °   Pi ezom etric Li ne: 1
                  Very Loose/Loose Sand Name: M edium Dense Sand          Unit Weight: 18 kN/m ³     Cohesi on': 0 kPa       Phi': 34 °   Piezometri c Line: 1
                  M edium Dense Sand    Name: Dense Sand       Uni t Wei ght: 19 kN/m³     Cohesion': 0 kPa      Phi ': 36 °   Pi ezom etric Li ne: 1
                  Dense Sand            Name: Retai ning Wal l   Unit Weight: 22 kN/m ³       Pi ezom etric Li ne: 1
                  Retai ning Wal l




            Text Figure 9: Slope/W output for long term conditions




             13 May 2022
             Report No. 22151-001-Rev0                                                                 9
Document Set ID: 22198682
Version: 1, Version Date: 05/12/2022