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Fakultet for ingeniørvitenskap og teknologi
Faggruppe for geoteknikk
Solution proposal Examination Geotechnics, material properties December 11 2004
Course responsible, associate professor Rolf Sandven
Task 1 Field investigations
Collection of information about the ground conditions should contain the following elements:
Maps of the area (topographical, bonity, hydrogeological, rock contours, hazard maps)
Archive for previous relevant borings (consulting companies, public offices)
Mapping of special ground conditions in the area (rock quality, organic masses,
groundwater outlets, draining systems, etc.)
Mapping of previous contaminations and outlets from previous and present activity in the
Collection of experiences from buildings, structures and infrastructure in the area (roads,
private estates, farms, previous slides etc)
Collection of buried installations in the ground (cables, pipes, etc)
Geotechnical problems associated with road construction in the area
Influence of excavation-, construction and piling works in the vicinity of the slope
Vibrations due to construction traffic, heavy trucks
Mass transport, temporary mass deposits, embankments
Pore pressure build-up and pore pressure fronts due to pile driving
Global area stability, short-term and long-term
Changes in groundwater and pore pressure conditions in the slope due to road drainage
Necessary information, mainly:
General soil mapping for a stratigraphical modell and information of soil types.
Extent of quick clay zones in the slope.
Strength parameters (effective- and total stress basis) for evaluation of local and global
stability in the area.
Groundwater- and pore pressure conditions are very important as input in stability
evaluations and discussion of groundwater balance.
Documentation of previous slide incidents in the area for possible back-calculations
Proposal for boring plan for stability evaluations of the slope
The site investigations should contain the following investigations:
Rough mapping of the area with a combination of CPTU and total sounding for detection of
layer boundaries, soil types and possibly depth to the rock surface.
Piston sampling or similar (block sampling) for determination of strength- and consolidation
parameters on retrieved samples in the laboratory.