Field performance of Fully Grouted piezometers Lucia Simeoni*, Fabio De Polo**, Giovanni Caloni***, Giorgio Pezzetti**** * University of Trento, Italy ** Autonomous Province of Bolzano, Italy *** SisGeo s.r.l., Italy **** Field s.r.l., Italy
Conclusions 1/2 Very good conformance of fully grouted piezometers in terms of response time (some minutes, depending on the drainage path); Response time could be calculated with cv=2÷90 cm2/min. It depends on
stiffness, hydraulic conductivity, degree of saturation; In the field, small differences in hydraulic head were calculated between fully grouted and traditional piezometers; Differences should be due to different response times and/or gravel pack height; Response time of fully grouted piezometers resulted acceptable to monitor the stability of river embankments FMGM2011 – L. Simeoni, F. De Polo, G. Caloni & G. Pezzetti - [email protected]
Conclusions 2/2 Fully grouted method provides an easier and faster installation, more precise control of transducer depths. The use of “standpipe + Casagrande filter” allows the use of a transducer with
large pore sinterised filter, making easier its saturation. With the “standpipe + Casagrande filter” the transducer may be retrieved. Fully grouted piezometers must be avoided when the average value of pore water pressure in an interval depth is needed.