Appendix D Geotechnical report · MCU18/0013

Project No. 304-2014
November, 2004 Page 17

 

6.5.5 Construction Details

With all retaining walls, it is essential that adequate drainage be provided behind the wall.
Any backfill placed behind the wall should be loose granular material. The backfill should
not be heavily compacted since research has shown that compaction can raise the earth
pressure to above the ‘at rest’ pressure. A permeable geofabric should be placed
between the natural soils and the loose granular backfill to prevent fine material piping

out of the natural soils and blocking the backfill.

During installation of any retaining walls, the insitu soils should be battered back to
minimise fall-in and subsequent disruption of works. Temporary batter angles are given
in Section 6.2.7. Suitable precautions to satisfy Health & Safety requirements must also

be adhered to; a maximum unsupported height of 1.5m is recommended.

CONSTRUCTION INSPECTION

 

It is recommended that placement of all structural fill, footing excavations, and cut batter
slopes in soil together with building subgrades should be inspected by Soil Surveys
Engineering Pty Limited. or a duly qualified Geotechnical Engineer. Should subsurface
conditions other than those described in this report be encountered, Soil Surveys
Engineering Pty Limited. should be consulted immediately and appropriate modifications

developed and implemented if necessary.

 

# SOIL SURVEYS ENGINEERING