ABSTRACT:

The paper deals with a numerical modelling applied for the evaluation of the static and dynamic stability of a limited rock shore strip located in Peschici, a small city along the Gargano promontory (Southern Italy), very important by a tourist and historical points of view. Thus a considerable effort was spent to numerically evaluate both probable and just only potential rock landslides. The Gargano promontory is characterized by a wide spread of different land morphologies like cliffs, coves, bays. Thus, for the aim of this paper, Peschici's cliff has been selected for which the highest geo hazard has been ascribed. The study has been carried out through firstly a geo-mechanical survey to recognize the discontinuity families, implemented by a terrestrial laser scanner survey, and after with a numerical modelling applying a 2D code (UDEC 6.0). The results allowed the identification of areas at most risk of collapse for the protection of the safety of the inhabitants.

1 INTRODUCTION

The main purpose of this paper was the evaluations about the static and dynamic stability of a limited rock shore strip located in Peschici, a small city along the Gargano promontory (Southern Italy), very important by a tourist and historical points of view, but affected by potential rock landslides.

The Gargano promontory is characterized by a wide spread of different land morphologies like cliffs, coves, bays. Thus, for the aim of this paper, Peschici's cliff was selected, in particular ‘Rupe Castello’ zone (Fig. 1), for which the highest geo hazard has been ascribed.

The geo-mechanical study has been carried out through two steps. In the first step, several discontinuity families have been recognized and then the Markland test was applied in order to identify the kinematic mechanism which could eventually affect the stability of the whole Peschici area. The geomechanical survey was implemented by the use of the Laser Scanner technique that permits to recognize rock discontinuities in areas difficult to reach. In the second step, some geological sections located in only "Rupe Castello" zone, related to different directions, have been selected to study the dynamic stability. The stability analysis, were carried out through the 2D numerical modeling software UDEC 6.0. (Itasca 2015). In the frame of this job, so multidisciplinary and multiscale approaches were applied to study instability characteristic of the selected area. It was necessary to investigate the geo lithologic-structural characteristics of the area, in order to characterize those aspects that could trigger the landslide activation. Moreover, an accurate geo mechanical study has been carried out to identify and measure both static and dynamic parameters which control the phenomena evolution, in the areas in which landslides have a high occurrence probability. A multiscale approach was necessary in order to identify the types of possible kinematic mechanism involved in an eventual instability. The obtained results allowed the identification of areas at most risk of collapse for the protection of the safety of the inhabitants.

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