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1. #Colorado rockfall simulation program version 5 how to#
2. #Colorado rockfall simulation program version 5 manual#
3. #Colorado rockfall simulation program version 5 software#

The model is recommended as a tool for the geologist and engineer responsible for analyzing and mitigating rockfall hazards. At each impact, the slope angle is randomly varied from the nominal value input by the user within the limit set by the maximum probable variation in the slope. Spherical, cylindrical and disk shaped rocks can be simulated. The model takes into account slope profile, rebound and friction characteristics of the slope and rotational energy of the rocks. For more information on CRSP-3D, contact Roger Surdahl at FHWA's Central Federal Lands Highway Division, 72 (email: For user support, contact Rick Andrew at Yeh and Associates, 30 (email: typical CRSP-3D graphical representation when performing a slope analysis.This rockfall computer program, which simulates rocks tumbling down a slope, predicts the statistical distribution of speed and bounce height and can be used for locating and designing rockfall mitigation.

#Colorado rockfall simulation program version 5 software#

To download CRSP-3D at no cost, visit The software is compatible with Windows®-based operating systems.

#Colorado rockfall simulation program version 5 manual#

Also included in the User's Manual is a 2D simulation of rockfall using manually entered slope geometry data.

LIDAR is a 3D mapping technology that uses a laser to rapidly scan and produce high-resolution images of areas such as rock slopes and outcrops. A second example features a 3D simulation of rockfall using LIDAR (Light Detection and Ranging) data.

#Colorado rockfall simulation program version 5 how to#

The tutorial example highlights how to create a new project and enter the necessary data. Included are three simulations designed to familiarize users with the software.

The manual walks users through installing and operating the program. The software is accompanied by the CRSP-3D User's Manual (Pub. The hardness coefficient measures the elasticity of the collision between a falling rock and the slope, as well as how much tangential resistance the rock is subjected to when sliding on the slope. CRSP-3D also uses just one input value, the hardness coefficient, to model slope material properties. "While the previous version used a semi-empirical approach, this new 3D version uses an improved numerical modeling method."Īmong other updates, the program's definition of surface roughness has changed so that only one value is needed to model the surface roughness for all rock sizes. "The CRSP software is recognized by users around the world," said Matt DeMarco of FHWA's Federal Lands Highway Division. The slope profile can be displayed in either 2D or 3D. Users can build rocks of several shapes, including spherical, cylindrical, and prismatic. Different possible rockfall paths on a section of slope can be modeled, as well as the rotational movement of nonspherical rocks. This may result in inaccurate estimates of rockfall properties, particularly rock rollout, dispersion along and below the slope, and bounce height.ĬRSP-3D uses the Discrete Element Method, a numerical modeling approach that incorporates the equations of motion to more accurately model movement of rockfall on a slope surface, including impact, rolling, launching, and sliding. However, 2D modeling may not be as effective when simulating the rotation and slope interaction of nonspherical rocks, as different rock shapes have different modes of rotation depending on velocity.

Modeling has helped engineers estimate how rockfall parameters such as bounce height, velocity, kinetic energy, and rollout distance change along the slope length. Created in the mid 1980s for the Colorado Department of Transportation, the original CRSP program was a 2D model used to predict the behavior of rockfall determine the need for rockfall mitigation measures such as constructing ditches, berms, fences, and walls and aid in the design of these measures. FHWA's new CRSP-3D software offers a more effective solution for evaluating rockfall hazards.Įvaluate rockfall hazards surrounding roadways more effectively with the new 3D version of the Federal Highway Administration's (FHWA) Colorado Rockfall Simulation Program (CRSP-3D).Īs development and traffic have increased in mountainous areas, the need to protect people, roadways, and building structures from falling rocks has become more important. The highly weathered limestone escarpment above the Glenwood Canyon Viaduct in Colorado produces rockfall over an area too large to be assessed by conventional 2D methods. Printable Version (.pdf, 0.3 mb) Colorado Rockfall Simulation Program: Modeling Rockfall in 3D