Rockyfor3D - Rockfall simulation program

ROCKFALL SIMULATION ANALYSIS

WITH ROCKYFOR 3D

THE PROBLEM

Predict how the blocks roll from the mountains

21-07-2014 Presentazione progetto

THE SOLUTIONS

RockyFor3D (www.ecorisq.org)

Software that simulates the rolling blocks on the slope

http://www.ecorisq.org/


THE MODEL

Rockyfor3D requires input data that represent the

reality on the ground with a degree of accuracy

comparable with the scale of analysis adapted to

the objective of the study.

For example:

1. Study of the danger at the regional scale;

2. Study of the danger on a local scale;

3. Detailed study for the project of a single site.

Rockyfor3D calculates the trajectory of rockfall in three

dimensions (3D) for individual rock. The model is physically

based (regards the description of the processes of falling

rocks) and probabilistic in the determination of the

parameters that affect the rockfall phenomenon.


INPUT DATA – MORPHOLOGY OF SLOPE

DEM: Digital Elevation Model of terrain. The morphology of the terrain with its

irregularities determines the characteristics of the rock fall and impacts occurred.

Recommended resolution between 2x2m e 10x10m


INPUT DATA – DESIGN BLOCK

SHAPE OF BLOCK: Spherical


SHAPE OF BLOCK: Parallelepiped




SHAPE OF BLOCK: Discoid



SHAPE OF BLOCK: Ellipsoial


INPUT DATA – FEATURES OF SOIL

0 – River 1 – Fine material

TYPE OF SOIL AND ROUGHNESS


2 – Sand/gravel 3 – Forest road




4 – Talus slope 5 – Bedrock with soil cover




6 – Rock 7 – Asphalt




INPUT DATA – FOREST/TREE

Depending on the diameter of the tree and the type of tree (coniferous or deciduous), the

model calculates the position of the impact on the trees (front / smear);

this influence on the energy dissipation.


INPUT DATA: ROCKFALL BARRIER / EMBANKMENT

Is possible simulate rockfall barriers or geogrid embankments; the input data is: position,

length, height and Maximum Energy Level (MEL).


OUTPUT DATA – TRANSIT ENERGY OF BLOCKS


OUTPUT DATA– NUMBER OF PASSAGES OF BLOCKS


OUTPUT DATA – NUMBER OF STOPPED BLOCKS


Kinetic energies on slope

Impact energies on rockfall protection

OUTPUT DATA – SECTIONS


OUTPUT DATA –3D VIEW


• Easy and quick assessment of the rockfall hazard and its parameters over large areas

(reconaissance) for subsequent more detailed analyses (both 3D or 2D).

• More reliable and realistic than 2D simulations in case of complex morphology and then

trajectories not parallel to each other along the slope.

• Unexpected bounces due to local obstacles, and not intersected by 2D sections, can be

seen only with 3D simulations.

• Assessment of protection structures position in the design phase: 2D simulation are

good to assess energy absorbtion and height, but don't provide any information that

allow the designer to move/extend the protection structures all along the slope

according to the trajectories.

Note: For design of protection works is good practice use the 2D software for detail design

of the heights and the energy class of protection structures; the definition of the position of

the protection structures (plan and section) is better 3D software

PROS –3D SIMULATIONS VS. 2D SIMULATIONS


PRO• Very quick simulation time, even for very large areas

• It accounts for the effect of vegetation on the rockfall phenomenon

• Output data format supported by most of GIS-based software for visualization

• Output data are not limited to energy, passing height and trajectories, but give

feedback also for the number of blocks that are expected to pass and stop in a given

cell, as well as for the probability of reach associate to a given cell in case of release of

multiple blocks from the source.

CON• Very sensitive to the input data format: simulation works only if file format and polygon

geometry / size is strictly compliant with the software specifications.

• Input data creation not very intuitive if compared with other 3D softwares.

• Input data creation requires some knowledge of GIS-based softwares.

• The data collection on filed requires experience

PRO / CON ROCKYFOR3D

Piazza San Giovanni, 2

38017 Mezzolombardo (TN)

t. +39 0461 60 01 31

f. +39 0461 60 05 73

ING. THOMAS FRENEZ theincline.it

[email protected]

Rockyfor3D - Rockfall simulation program

Engineering

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