Road-Landslide Interaction: Monitoring and Inverse Stability Analysis (VSS2005/502)
Overview
Background & policy context:
The most reliable approach to the long-term displacement and stability analysis of the large creeping landslides is based on the back-calculation (inverse analysis) of soil parameters from observed displacements and measured earth and water pressures in the sliding layer.
In addition to the conventional geodetic measurements, it is suggested to monitor the deformations of a road intersecting a landslide using a novel fiber-optics strain measurement technology. This could serve a double purpose: to monitor the health of the road structure and to provide a unique data for the inverse analysis of the landslide stability and displacements. A novel Inclino-Deformometer (IDM) will allow for the first time to measure reliably the earth pressures in the sliding layer contributing more unique data for the inverse analysis. Novel approach to chemical treatment of clayey soils will help to increase the soil permeability allowing for improved drainage in the sliding layer.
Novel approach to biological treatment of soil will help to remediate effects of the chemicals on the environment and to increase the shear strength of soil due to the bio-mineralisation. Results of the research will be used for prediction of the road and landslide behavior and for planning of the stabilisation measures.
Objectives:
The goal of the project is to develop a state-of-the-art procedure for analysis of long and short term effects of different environmental factors (including the road and railway construction and operation) on landslide evolution and stability. This procedure will be based on the inverse analysis of the monitored landslide displacements with the landslide being used as a gigantic “strain gauge” to interpret its displacements for mapping the shear and normal stresses on the slip surface and in the sliding body.
Methodology:
Following activities will be part of the project:
- “Further development of the IDM” will be divided into the following subtasks:
- Improvement of accuracy
- New analytical and numerical approaches to back-calculation of pressures
- Time dependency of measurements
- Effects of grout
- “Further development of the FO landslide monitoring techniques” will be divided into the following subtasks:
- Design of cables and micro anchors
- Full scale shear zone simulation
- Further monitoring of the instrumented landslides approaches to back-calculation
- Improvement of interpretation techniques
- “Development of chemical and biological stabilisation techniques” will be divided into the following subtasks:
- Chemically enhanced drainage
- Bioremediation of the negative effects of the chemicals
- Strength increase via bio-mineralisation
- “Study of a naturally constrained landslide (Brattas, St. Moritz)” will be divided into the following subtasks:
- Field measurements
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