Abstract

Abstract. The aim of the study was to perform a study on the western slope of the Monti Parioli hill (Rome, Italy) affected by frequent rock-fall phenomena, such as the one that occurred on 13 November 2007. This goal was achieved by defining a detailed reconstruction of the stratigraphical, geological and geomechanical structure of the slope and by conducting a back-analysis of the rock-fall event using 2-D and 3-D modeling tools. The reconstruction of the slope's geological structure, characterized by the presence of two anthropogenic cavity systems, and the characterisation of geomechanical properties of outcropping terrains have been realized by means of a detailed geological survey and a campaign of direct and indirect investigations. Therefore, continuous rotary, coring boreholes up to 60 m, collecting undisturbed samples for laboratory tests and performing direct investigations such as SPTs and pressuremeter tests were carried out. The indirect investigations included electrical tomography surveys, linear surface seismic refraction surveys and seismic cross-hole tests. Using the reconstructed geological-technical model, it was possible to define the stability conditions of the slope at the time of collapse by using a computational two-dimensional explicit finite difference program (FLAC) and a 3-D finite element analysis (FEMLAB).

Highlights

  • This paper presents the results of a study conducted by the Geological Survey of Italy (GSI), which is presently part of the Institute for Environmental Protection and Research in Rome, Italy (ISPRA), and the Department of Geological Sciences of the University Roma Tre (UNIROMA3) under an agreement with the Civil Defence Office of Rome Municipality (UEPC)

  • The aim of the study was to define the geological and geomechanical characteristics of the western slope of the Monti Parioli hill in Rome, which was affected by a rock-fall in November 2007

  • On 13 November 2007 at 11:40 LT, a rock-fall occurred in an area approximately 20 m wide and 30 m long on the western slope of Monti Parioli Hill, which sits on Viale Tiziano (Fig. 1)

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Summary

Introduction

This paper presents the results of a study conducted by the Geological Survey of Italy (GSI), which is presently part of the Institute for Environmental Protection and Research in Rome, Italy (ISPRA), and the Department of Geological Sciences of the University Roma Tre (UNIROMA3) under an agreement with the Civil Defence Office of Rome Municipality (UEPC). The GSI was studying the landslide events in the Municipality of Rome as part of the geological monograph about the Eternal City (Amanti et al, 2008). For this reason, the GSI possessed recent observational data on the geomorphology of the collapsed slope. The results of the investigations and the slope modelling using both 2-D and 3-D tools are presented in this paper

The 13 November 2007 rock-fall and other events in the past
Surveys
Geomorphological structure
Litostratigraphic structure
Groundwater flow
Reconstruction of the engineering geological model
Stability check
Conclusions
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