Exploiting a Semi-Automatic Point Cloud Segmentation Method to Improve the Quality of Rock-Mass Characterization. The Cima Grappa Conservative Restoration Case Study

Francesco Mugnai,Grazia Tucci,Paolo Farina

doi:10.3390/ijgi10050276

Francesco Mugnai, Grazia Tucci + Show 1 more

Open Access

https://doi.org/10.3390/ijgi10050276

Copy DOI

Abstract

This paper presents results from applying semi-automatic point cloud segmentation methods in the underground tunnels within the Military Shrine’s conservative restoration project in Cima Grappa (Italy). The studied area, which has a predominant underground development distributed in a network of tunnels, is characterized by diffuse rock collapsing. In such a context, carrying out surveys and other technical operations are dangerous activities. Considering safety restrictions and unreachable impervious tunnels, having approached the study area with the scan-line survey technique resulted in only partial rock mass characterization. Hence, the geo-mechanical dataset was integrated, applying a semi-automatic segmentation method to the point clouds acquired through terrestrial laser scanning (TLS). The combined approach allowed for remote performance of detailed rock mass characterization, even remotely, in a short time and with a limited operators presence on site. Moreover, it permitted extending assessing tunnels’ stability and state of conservation to the inaccessible areas.

Highlights

The Cima Grappa Military Shrine restoration project has been promoted and financed by the Italian Ministry of Defence of the Italian Presidency of the Council of the Ministers.It concerns a mountain area on the top of Monte Grappain the Venetian Prealps context (Figure 1).The Cima Grappa Military Shrine is the largest Italian military ossuary of the FirstWorld War
Most of them were buried in mass graves close to battlefields
In correspondence to inaccessible areas and areas prone to collapsing events, the classic geo-mechanical survey (Figure 3) scan-line detection method [30] of the rock mass was substituted with measures obtained from laser scanning datasets [31,32]

Summary

Introduction

The Cima Grappa Military Shrine restoration project has been promoted and financed by the Italian Ministry of Defence of the Italian Presidency of the Council of the Ministers.It concerns a mountain area on the top of Monte Grappa ( called “Cima del Grappa”)in the Venetian Prealps context (Figure 1).The Cima Grappa Military Shrine is the largest Italian military ossuary of the FirstWorld War. The Cima Grappa Military Shrine restoration project has been promoted and financed by the Italian Ministry of Defence of the Italian Presidency of the Council of the Ministers. It concerns a mountain area on the top of Monte Grappa ( called “Cima del Grappa”). Between 1920 and 1930, remains of the fallen were unearthed and reburied in a large war memorial. Politicizing the memory of the fallen was one of the primary purposes. The war memorials, designed by architects close to the regime, were constituted near former front lines and kept under the patronage of a special commission from the former Ministry of War [1]

Methods

Results

Conclusion