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Salini-Impregilo is building part of the largest sanitary sewer system in thehistory of Argentina in the suburbs of Buenos Aires City, to serve a populationof almost five million people. The project is an outfall TBM tunnel 12 km long,starting from a reception shaft in the river margin, and transporting thesewage 35 meters below the \textit{Rio de la Plata} riverbed to the point ofdischarge. Within the final kilometer of the tunnel, a set of 36 standing pipesso-called \textit{risers} are constructed by driving steel tubes upwards andpassing through dense sands, sandy clays and soft clays. Risers are linked-upwith the launching lining segment using flange unions.  Driving of risers upwards will generate excess pore pressure and disturbancein fine soils and, once the pipe is placed in its final position, negative skinfriction due to reconsolidation and creep. A risk assessment of the downdrag ispresented in this paper, based on the estimation of the force and/ordisplacement in the riser-tunnel union generated by this effect. The issues ofwhether it is desirable to instalock the riser-tunnel union at an early ageafter installation of the riser and the time lapse required to reduce negativeskin friction effects are discussed. Results are validated by comparing themodel results with field measurements in prototype models.

A risk assessment of downdrag induced by reconsolidation of clays after upwards pipe jacking