JB-TOTALSONDERING : Jämförande sonderingar och utvärdering av egenskaper i isälvsavlagringar kring Igelstaviken

Sammanfattning: The main purpose of this thesis has been to find a way to evaluate the soil parameters for the Total sounding method (TS), such as the inner friction angles and settlement modules. This study only includes an analysis of soil profiles from the Stockholm region. The chosen location for the study is a proposed residential area east of Igelstaviken in Södertälje. Presently, the subject plot is located in a residential area and is also adjacent to a school area. Total sounding is originally a Norwegian soil testing method. The differences between the sounding methods (weight-, ram-, CPT-sounding) are for instance how the sound is driven into the ground and what kind of parameters that are registered. Compared with other soundings methods such as weigh sounding, ramsounding, and CPT sounding, total sounding is not as widely used in Sweden. This method is also rather new and consequently few previous studies have been conducted in this area. The subject location, Igelsta Shore has a characteristic soil profile that provides a representative snapshot of the soil composition in Stockholm.. This is a mixed soil composition consisting offriction soils, cohesive soils, and boulders. The are is known for its glacier tills and is called “Södertäljestråket”. There is a contaminated area at the location where the study is made it is area is enclosed for a possible future decontamination. Moreover, fill deposits exits in the south part of the study location which areare leftovers from the Igelsta heat plant. The study covers sounding results from the examinded area. For Total sounding the feed force has been calculated into point pressure to be comparable to the point pressure from the CPT (Cone Penetration Test). When CPT’s and TS’s point pressures were compared a factor were empirically found to describe the relation between the point pressures for these two methods. This factor made it possible to evaluate the friction angles and the settlement modules from Total sounding. These parameters were then compared to the inner friction angles and the settlement modules for CPT, weight sounding and ram sounding. The comparison was made in order to ensure that the soil profile could be evaluated by this method. The evaluation computer program CONRAD was used to evaluate the inner frictional angles and settlement modules in a addition to this. Conclusively this study shows that the inner friction angles and the settlement modules can be evaluated from the sounding results of Total sounding by means of an empirically calculated factor. This factor has made it possible to compare CPT and TS result, thus enabling the use of this data in evaluating soil profiles.