Impact of Large Landslides in the Mountain


B3. Workpackage description
Workpackage number 4

Objectives and input to workpackage

Objectives of this workpackage are:

  • To estimate the run out behaviour of different types of landslide.
  • To analyse the influence of geological and geotechnical parameters such as type of rock, structure of rock geomorphology on the run out behaviour
  • To improve the currently used mechanical methods to simulate rock falls and run out behaviour referring to a 3 dimensional calculation

Input to this workpackage are:

  • Data obtained from WP1, WP2 and WP3;
  • Geomechanical models of the sites;
  • Evaluation and calculation of the available monitoring data to recognise the type of failure and run out mechanisms.


Description of work

In order to model the run out behaviour the computer programs from Itasca PFC2D or PFC3D will be used. The programs use assemblies of circular particles to simulate rock elements, in order to calculate the movements and their interactions. After an appropriate adjustment these programs allow to generate the run out mechanisms which cannot be simulated by programs used today. In order to quantify the affected run out area the following components will be evaluated:

  • Geomorphological analyses both of the main scarp and (above all) of the accumulation area - input of the basic data of the sites into the model;
  • The influence of several parameters such as block size and structure on the velocity and the areas influenced by the landslide propagation;
  • Assessment and evaluation of the block shape and block size on the kind of movement and run out behaviour.

D9. Numerical model of the run out areas at appropriate sites;

D10. The run out relevant values to assess the risk area;

D11. Report/guidelines on the improved computation procedures.

Milestones and expected result

Iincorporation of basic data and models of the affected accumulation areas;

Catalogue of significant run out parameters for the possible affected areas; establishment of detailed methodology - deliverable D9 available;

Calculation of run out behaviour at the well monitored sites, including dependency on rock parameters and geomorphology;

Application of the methodology at less documented sites, including risk assessment in the accumulation areas - deliverable D10 available;

Report/guidelines - deliverable D11 available.