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Georock 2D
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Simulation of rock falls based on
the Lumped Mass and
CRSP models.
Computational hypothesis for
Lumped Mass is: Two
dimensional diagram in which the
slope profile consists of a number
of straight line segments; the block
is reduced to a point and that air
resistance is immaterial.
CRSP (Colorado
Rockfall Simulation Program) model
was devised by Pfeiffer and Bowen
(1989) proposes the modeling of fall
of blocks having, in the vertical
plane of fall, spherical,
cylindrical or disc form. CRSP
describes the behavior of the blocks
by applying the equations of
parabolic trajectory of bodies in
free fall and the principle of
conservation of total energy. As
opposed to Lumped Mass, the
roughness of the slope and the
dimension of blocks are used as
further parameters to model the
impact event. Specifically, CRSP
assumes that the angle formed
between the direction of the block
and the slope profile, be varied in
accordance with a statistic to be
defined for each case investigated.
Thus the model treats even
combinations of movement in free
fall, bounce, roll, and slide that
can vary in relation to the size of
the blocks and the roughness of the
slope. The reliability of this
method has been verified by
comparison of the numerical results
against field trials.
The software interfaces with the
program TRISPACE
for the automatic generation of
sections from plan annotated with
elevations or from rasterized images.
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DATA INPUT
Graphic input with mouse (or other pointing device);
Tabular numeric input;
Input of EXCEL data;
Input of DXF files;
Input of topographic profile generated by TRISPACE;
Import of rasterized images.
CALCULATION METHODS
• CRSP method (Colorado Rockfall Simulation Program)
• LUMPED MASS method;
INTERVENTION
Barriers in general;
GRAPHIC AND COMPUTATION OPTIONS
Calculation type: Monte Carlo, deterministic;
Block form: Spherical, Cylindrical, Disc;
Casting point or specification of casting zone;
Auto identify casting zone;
Animated display of bounce and impact;
Display of all calculated trajectories;
Choice of generic trajectory;
Energy, Velocity, Flight time, and parabola height
information at any point of the trajectory;
Display of kinematics parameters relative to the
barriers;
Trajectories may be interrogated by mouse.
Display of percentage of boulders passing defined
points on fall path. |
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