31.10.2014 Views

Volume 6 – Geotechnical Manual, Site Investigation and Engineering ...

Volume 6 – Geotechnical Manual, Site Investigation and Engineering ...

Volume 6 – Geotechnical Manual, Site Investigation and Engineering ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Chapter 1 PLANNING AND SCOPE<br />

cheap method of examining near-surface deposits in situ, but the cost increases dramatically with<br />

depth, because of the need to support.<br />

Shallow trial pits can be excavated by wheeled offset backhoe which has a digging depth of about<br />

3.5 <strong>–</strong> 4.0m, <strong>and</strong> may not be able to move easily across wet steeply sloping sites. Deeper pits, or pits<br />

where access is difficult can be excavated by 360° slew-tracked hydraulic excavators. These<br />

machines have a digging depth of about 6 m, <strong>and</strong> an available digging force about 50—100%<br />

greater than the backhoe.<br />

1-26 March 2009

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!