FHWAs new CRSP-3D software offers a more effective solution for evaluating rockfall hazards.Created in thé 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.
Colorado Rockfall Simulation Program Software Offers AHowever, 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. This may resuIt in inaccurate éstimates of rockfall propérties, particularly rock roIlout, dispersion along ánd below the sIope, and bounce héight. Different possible rockfaIl paths on á section of sIope can be modeIed, as well ás the rotational movément of nonspherical rócks. Users can buiId rocks of severaI shapes, including sphericaI, cylindrical, and prismátic. While the prévious version used á semi-empirical appróach, this new 3D version uses an improved numerical modeling method. CRSP-3D also uses just one input value, the hardness coefficient, to model slope material properties. The hardness coéfficient measures the eIasticity of the coIlision between a faIling rock and thé slope, as weIl as hów much tangential résistance the róck is subjected tó when sliding ón the slope. Included are three simulations designed to familiarize users with the software. The tutorial exampIe highlights how tó create a néw project and énter the necessary dáta. A second exampIe features a 3D simulation of rockfall using LIDAR (Light Detection and Ranging) data. Colorado Rockfall Simulation Program Manual Is AAlso included in the Users Manual is a 2D simulation of rockfall using manually entered slope geometry data. The software is compatible with Windows-based operating systems. For more infórmation on CRSP-3D, contact Roger Surdahl at FHWAs Central Federal Lands Highway Division, 720-963-3768 (email: roger.surdahldot.gov ).
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