There are two ways to access very soft sites such as tailings dams to undertake in situ testing:
See our Rigs and Services pages and our Tailings Brochure. IGS has evolved its business and equipment to work the second way, for two reasons:
The red dashed line on the qc Vs depth graph, below, is the potential impact on qc under this scenario.
Based on a current result from a current IGS project.
It assumes that the access embankment has been in place for a few days/weeks before CPT testing (see note marked * below the figures).
(apologies to Boussinesq for the simplifications made)
* Even if the embankment has not been in place long enough to cause the significant qc changes depicted, the embankment’s mass will significantly elevate pore pressures and in this way similarly “spoil” the test data over its zone of influence.
For more information please contact any of us at IGS: