1-22276-01 site plan

Project No. 1-22276                                                                                                                  Page | 29
February, 2020
Ref: 1-22276, 2020-02-28, BR VER 2
Wessel Petroleum Pty Ltd – GEOTECHNICAL INVESTIGATION - Proposed Service Station Reconstruction, 52-54 Mary Street and Weyba Road,
Noosaville




        TRAPEZOIDAL DISTRIBUTION                                               TRIANGULAR DISTRIBUTION


                             0.25H




       H                             OR
                   0.4  H                         0.65 Ka  H



                            0.25H

              Stiff Clay                         Sand                                               H


                                                                  FIGURE 4

The lateral pressure distributions shown in Figure 4 do not include hydrostatic pressure or
surcharge loadings. It is recommended that where the retaining walls are expected to be
surcharged (e.g. by footings, traffic loads, sloping ground surface, etc.) Soil Surveys
Engineering should be contacted to provide a recommended lateral earth pressure distribution.

The parameters selected for use in Figure 4 are dependent on the preconstruction geometry of
the face being retained. Where the material has been cut using the recommendations (or flatter)
as outlined in Section 6.2.8 the backfill parameters will control. Where a steeper angle is used,
the earth parameters will control.

As a general guide (using an elastic model) line loads located 2.5H away from the wall (where
H is the wall height) results in lateral forces of less than 10% of the line load. Parameters for
assessment of lateral earth pressures are outlined in Table 7.




                                                                                                            SOIL SURVEYS