Exam 2006 proposed solution - NTNU Norwegian University of...

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NTNU Faculty of Engineering Science and Technology Norwegian University of Department of Civil and Transport Engineering Science and Technology Geotechnical Division Note Topic: Proposed Solution, Examination TBA 4110 Soil Investigations 8 December 20006. Consultant: Course responsible, professor Steinar Nordal Date: 16.12.2002 Signature: SN File: M:\SNO\Fag2006\TBA4110\Exam 2006 proposed solution.doc _________________________________________________________________________________ Task 1 Field investigations (a) Collection of information about the ground conditions and from where: Maps of the area: Topographical, economical, geological maps with quaternary deposits and rock base, hydrogeological. (From NGU and the local public offices “kommune” or city, most is available on Internet, but access passwords from the appropriate agency may be needed.) - Mapping of quick clay deposits in the area: hazard maps, snow avalanche maps (NGU, NGI) Information on existing pollution or contamination in the area (Public offices, local industry, local people) Collection of experiences from buildings, structures and infrastructure in the area; roads, railways, bridges, previous slides etc. (from public offices) Collection of buried installations in the ground; cables, pipes, etc (from public offices) Previous relevant borings from the area (consulting companies, public offices) Mapping of special ground conditions in the area; agricultural draining systems, etc. (local farmers) (b) Project class: Complexity: High Consequences: Serious Project class: 2 Geotechnical problems associated with development of Halsen school: Settlement considerations, differential settlements and settlement versus time o Soil layering and soil stiffness and strength o Depth to bedrock o Draining layers Choice of foundation and excavation solutions o Direct foundation with possible use of sand-drains and/or preloading o Settlements and differential settlements for the school building o Bearing capacity of single foundations o Stability of noise protection embankment o Piling: Depth to bedrock or alternatively necessary pile length for friction piles Environmental mapping o Detection of possible ground contamination
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Page 2 of 7 exam 2006 proposed solution (c) Identification of the ground conditions from CPTU The two soundings give different pore pressure due to different contributions from normal and shear stress changes in the soils close to the probe surface. The pore pressure will be lower behind the conical part due to a smaller increase in normal stresses. Other factors that may cause differences may be variations due to testing procedures and equipment: Saturation, calibration errors, wear. The following average values are taken from the CPTU recording (GW: 1m below terrain):
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Exam 2006 proposed solution - NTNU Norwegian University of...

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