ABSTRACT:

The ancient Calomini hermitage, located in the Garfagnana area, is located on a steep slope facing south, surmounted by an 80 to 130m high hanging rock wall. The hermitage, a significant example of religious architecture, has been a pilgrimage place since the Middle Ages. The stability and safety of the complex are threatened by rock falls. In the last years, some remedial works have been carried out and wire meshes have been hung on the rock wall, over the hermitage and in the immediate vicinity. Nevertheless, a significant portion of the area was still dangerous and exposed to severe landslide hazard, and several blocks in fact felt down in the last summer. The study described in a first step is a typical example of a multidisciplinary approach in the analysis of the stability of a rock cliff. Then some numerical analyses were performed on some particularly interesting sections using a bi-dimensional distinct-element method.

1 INTRODUCTION

The ancient Calomini hermitage, a significant example of the religious architecture, has been a pilgrimage place since Middle Ages, when the first community of monks settled, supported also by the abundance of spring water (Fig. 1). The architectural complex, already existing in the 10th century, is intimately and physically connected to the rocks. In fact, the little medieval monastery is built in the rock mass for more than half of his length. At present, the stability and safety of the complex are threatened by rock falls, which frequently involve the calcareous wall, because of its poor geomechanical quality. In order to evaluate the landslide hazard of the area, some investigations were performed: structural and geomechanical analysis, rock mass classification. These data were used to performsome numerical analyses and to verify the possible evolution of the rock slope.

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