RFI - Attachment C - Slope Stability Assessment and Geotechnical report · MCU20/0026

Project No. 1-22543                                                                                                                Page | 21
June, 2020
Ref: 1-22543, 2020-05-20, BR SSA VER 1
Sanya Holdings – Slope Stability Assessment and Geotechnical Report - Proposed Residence, 40 Park Crescent, Sunshine Beach




                      Dense Sand = 20kPa

Lateral Capacity

Broms (1966) has related the values of Ks and d to effective angle of shearing resistance of
cohesionless soils and various pile materials, as shown in Table 7.

TABLE 7 VALUES OF KS
                                                   d                                                        Ks
            Pile Material
                                                Degrees               Low Relative Density                         High Relative Density
                Steel                             20                          0.5                                           1.0
               Concrete                           ¾                          1.0                                           2.0

It should be noted that the calculated ultimate resistance of a given pile should also take into
account the installation effects of that particular type, i.e. whether displacement or non-
displacement pile performance can be expected.

           6.2.6       Slab on Ground

General

Field and laboratory test results indicate that the existing natural soils are suitable for a
conventional slab on natural ground construction. In areas of any fill, localised pedestals would
be required to suspend the slab.

For constructability of the proposed slab, it is generally preferred to have the same type of slab
across the proposed development site.

Sub-Base

It is suggested that a layer of sub-base be provided under all concrete slabs. The sub-base
material should be compacted to a density not less than 95% of maximum dry density in
accordance with AS 1289 5.2.1 (Modified compaction). The sub-base is provided under a
concrete slab to:-

          Provide a stable 'working platform' on which to operate construction equipment;
          Facilitate the provision of a uniform bearing surface under the slab.

Sub-base material should be of good quality conforming to requirements (minimum) of Material
Type 2.4 as specified in the Queensland Department of Transport, Standard Specification MRS
11.05, Unbound Pavements (December, 1993).

           6.2.7       Design Considerations

Inspections

It is recommended that inspections be undertaken by an experienced geotechnical engineer
from Soil Surveys Engineering following footing excavations to confirm the adequacy of the
founding soils. Inspections should be carried out prior to placement of reinforcing steel and
ordering of concrete.




                                                                                                               SOIL SURVEYS