CHASM V3'4

1
CHASM V3.4

• Combined
• Hydrology
• and
• Stability
• Model
• software for slope hydrology and stability
  analysis

2
CHASM contact information

• Malcolm Anderson
• Bristol Innovations Software Sales Limited
• Phone [phone]
• Fax [phone]
• Email chasm-env_at_bristol.ac.uk
• Website www.chasm.info
• Address 3rd floor
• Saint Bartholomews
• Lewins Mead
• Bristol BS1 2NH
• UK

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This demo

• introduces the basic concepts behind the design
  of CHASM software
• provides examples of screen shots from the
  WINDOWS version of CHASM
• and gives an example application of CHASM
  WINDOWS version

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CHASM software

• CHASM is an integrated slope hydrology/slope
  stability software package that aids the
  assessment of slope stability conditions.

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CHASM Capabilities

• An integrated slope hydrology/slope stability
  software implemented in both WINDOWS and UNIX
• Unsaturated and saturated slope hydrology
  modelled using a finite difference formulation
  directly coupled to slope stability analysis
• fully dynamic slope hydrology implemented for 3D
  convergent, divergent or rectilinear slope
  geometries

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CHASM Capabilitiescontinued.

• Allows direct input of storm hydrographs (hourly
  intensities) or design rainfall
• Incorporation of upslope recharge
• Incorporation of vegetation cover effects for
  both slope hydrology and slope stability
• Specification of multiple soil strata and
  associated properties
• WINDOWS slope draw facility that is user defined

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CHASM

• A GUIDED TOUR THROUGH THE WINDOWS

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CHASM for WINDOWS selected screen shots
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• WINDOWS BASED DEFINITION OF PROFILE

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Stability Analysis
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2D Hydrology
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3D Hydrology
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Rainfall
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Soil properties
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Vegetation
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Canopy Modelling
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Static Analysis
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Output from CHASM (from 2D hydrology example)
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Effect of slope plan curvature on the FOS during
a 110yr Hong Kong design storm (24 hrs at
15mm/hr)
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Graphical representation of hydrological
Conditions
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Minimum Factor of Safety for each Hour of
Simulation
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APPLICATIONSinclude directly linking design
rainfall to factor of safety
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CHASM Applicationsexamples

• Assessing the role of surface cover on slope
  stability
• Establishing the controls on stability afforded
  by differing slope plan curvatures
• Through the full dynamic linkages of the model
  relating design rainfall to factor of safety
• Probabilistic analyses
• Implementation through a GIS environment to
  provide wide area stability assessment for
  prioritization of remedial works

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CHASM literature

• Includes
• Proceedings Institution of Civil Engineers -
  Impact of vegetation on slope stability in a
  humid tropical environment, 1995 (awarded
  Trevithick Premium by the ICE)
• Transport Research Laboratory - Hydrological
  design manual for slope stability in the tropics,
  Overseas Road Note, 14, 1997
• ..Visit the website www.chasm.info for more

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CHASM contact information

• Malcolm Anderson
• Bristol Innovations Software Sales Limited
• Phone [phone]
• Fax [phone]
• Email chasm-env_at_bristol.ac.uk
• Website www.chasm.info
• Address 3rd floor
• Saint Bartholomews
• Lewins Mead
• Bristol BS1 2NH
• UK