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A. Eichhorn:
"Geomechanical Modelling as Central Component of a Landslide Alert System Prototype: Case Study "Opencast Mine"";
Talk: XXIII International FIG Congress, Shaping the Change, München; 2006-10-08 - 2006-10-13; in: "XXIII International FIG Congress, Proceedings", (2006), ISBN: 87-90907-52-3; Paper ID TS 29.4, 11 pages.

Impact and risk assessment in a landslide area primarily requires the definition and reliable
separation of different kinematic / geomechanical conditions of the slope. In the EU funded
project OASYS five decision levels were defined to evaluate the current stability status, and
to take adequate measures for instrumentation, monitoring and alerting
Normal operation ⇒ Low Margin Operation ⇒ Warning ⇒ Emergency ⇒ Post Mortem
To provide suitable indicators for allocation of the different levels is one major goal of the
analysis of the landslide process and the task of an alert system. Structural models of landslides,
realized with Finite Element software packages like FLAC-2D/3D or Distinct Element
methods like PFC2D/3D (from HCITASKA COMPANY) offer very comprehensive possibilities
for the analysis and prediction of critical states of the slope. Representing its inner structure,
numerical stress distribution indicators (i.e. a factor of safety) can be calculated.
In this paper the creation and combination of a geomechanical FE-model with a geodetic and
geotechnical monitoring system of a test-slope is presented. The slope is located within an
opencast mine in Northern Germany and is primarily influenced by mass excavation with
bucket-wheel excavators.
Using the calibrated FE-model it is possible to predict in each excavation phase the `normalī
reaction (i.e. expected displacements in selected points) of the slope. It is also possible to
simulate critical loads and parameter configurations that cause local or global failure events.
Comparing the calculations with the empirical observations from the installed monitoring
system it can be evaluated whether the slope is going further on to a normal or a critical state
which may cause a slide.
The FE-model is planned to act as one central databased component within the prototype of a
knowledge based alert system.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06586718

Project Head Heribert Kahmen:
EU-OASYS