Geotechnical design of retaining micropile walls for an underground parking on a sloping area

In the present study, a case study of geotechnical design of a retainage micropile wall for an underground parking on a sloping area is described and discussed. Vertical micropiles of a length of about 6-9m, coupled with a series of inclined micropiles having passive anchors function and an adequate drainage system, consisting of a trench drain, are considered. Geological and geotechnical surveys have been carried out to determine a lithostratigraphical profile and the physical and mechanical properties of subsoil layers to assess the design parameters to be used for numerical analyses. The computer program FLAC is adopted to perform the geotechnical design of the retaining micropile walls and the stability analyses of the slope. The results from the study performed by using FLAC program are compared with those obtained by means of some different software and with those obtained from manual calculation.