Appendix D Geotechnical report · MCU18/0013

Project No. 304-2014
November, 2004 Page 8

6.2.7 Batters

Maximum batter angles for different material types are outlined in Table 3 for the
unsurcharged temporary cut and fill batters less than 3m high on the site. Where
surcharges (eg. footings, live loads, etc.) are located within H (height of batter) of the top
of the batter, then some reduction in design angle will occur. Steeper batters are
possible with suitable surface protection such as stone pitching, etc. or by use of
retaining structures (temporary and permanent). Fill batter slopes are dependent on

suitable compaction being achieved.

TABLE 3 BATTER ANGLES (Slopes less than 3m high)

 

Material Batter Angle
Loose Sand 24 degrees (1V:2.25H)
Medium Dense Sand 26 degrees (1V:2H)
Dense to Very Dense Sand 28 degrees (1V:1.9H)

 

 

 

 

 

Notes:
1. These values assume no seepage. If seepage is present the recommended angles would need

to be significantly reduced or the use of dewatering considered.
2. Subject to inspection by an experienced geotechnical engineer/engineering geologist.

 

 

 

It is essential that any batters be suitably protected from erosion and scour by
appropriate drainage and placement of plastic or hession sheeting, etc. Pavement runoff
should not be allowed to discharge directly across the batters without suitable scour

protection.

6.3 Building Foundations
6.3.1 Site Classification

While a site classification in accordance with AS.2870 ‘Residential Slabs and Footings'
relates to conventional residential type construction and is not directly applicable for this

development, it is, however, a valuable method of classification.

Given the sandy nature of the site, the site may be designated Class 'A’ (non reactive) in
accordance with AS.2870.1-1996 'Residential Slabs and Footings’, where ground surface

movement is not expected to occur with changes in soil moisture content.

It is recommended that the designers satisfy themselves that the use of AS.2870 is

applicable for the proposed design.

 

# SOIL SURVEYS ENGINEERING