Impact of Large Landslides in the Mountain


B3. Workpackage description
Workpackage number 3

Objectives and input to workpackage

The objectives of this workpackage are:

  1. To define a three-dimensional numerical model of the sites that includes the main topographic, geological and geomechanical features.
  2. To analyse the mechanical response of the site under several scenarios using available codes ( DRAC, FLAC3D, BEMCOM, MAP3D, BEASY).
  3. To provide a methodology to predict mechanical responses and failure of a site, evaluate its safety for a given failure scenario and provide an assessment of risk and possible preventive measures.

Input to workpackage:

  • Geodetic surface model, geological structure of the sites, seismic profiles.
  • Mapping of the geological and geomorphologic field structures with respect to possible partial movements.
  • Measurements and statistical calculation of tectonic elements of the sites.
  • Measurements of mass displacements from monitored sites.

Description of work

The first part of this workpackage consists on the development of a 3D finite element, boundary element and finite differences mesh of each site that includes its main features allowing for the analysis of the suspected mechanisms of movement of the site, identifying the critical one. This task requires a previous definition of each site’s geo-mechanical elements (type, geometry, characterisation, etc.): topography, geology, morphology, geotechnical properties, etc. The second part consists on extensive finite element, boundary element and finite differences analysis (using available software, some developed by the partners and thus well known and readily accessible) with different material models to analyse the suspected failure mechanisms. The partners have available both long-term instrumented sites (that will be used to calibrate the models) and non-instrumented sites (that will be used as test sites for application of the methods developed in this project).

The work here described will lead to the establishment of procedures and guidelines to study suspected landslide areas, evaluate the risk of failure, and issue recommendations for remedy and mitigation of the impact of failure.

  • D6. Numerical model of the sites including all relevant topographic, geologic and geomorphologic features;
  • D7. report including the results of the finite element, boundary element and finite differences analyses performed on all sites, with prediction of failure, evaluation of safety parameters, and recommendations for mitigation of failure;
  • D8. set of guidelines to follow on a suspected landslide area.
  • Milestones and expected result
  • Data pertaining to all sites received and processed;
  • Detailed mesh of all sites available for finite element, boundary element and finite differences analysis (deliverable D6 available);
  • Conclusion of the numerical analyses, including safety assessment and recommendations on all sites (deliverable D7 available);
  • Report and guidelines (deliverable D8 available).