An improved hazard assessment chart for rock falls in near vertical blocky rock environments

The purpose of the study was to perform rockfall stability analysis and develop an improved rockfall hazard matrix chart using the R518 road in Limpopo as the case study. The study entailed structural mapping, wedge simulation using stereonet plots. The RocFall software was then used to identify the parameters that influence the occurrence of rockfall. The software was also used to monitor the variations in the kinetic energy of rolling, bouncing or falling rocks. The effects of the initial height and velocity of falling rocks on the final destination of fragments were also explored. Results showed that the selected area along the R518 road consists of joints and bedding planes. These features weaken the rock mass and create wedges that can potentially fall. Simulations with RocFall, on the other hand, indicated that slope height, vegetation density, slope angle, the velocity of the falling rock largely contribute to the extent that the broken rock could reach. From the empirical and numerical findings, an improved rockfall hazard rating chart was proposed. The chart was found to be suitable for the rating of level of rockfall hazard along highways and roads.

Automated summary

The study focused on rockfall stability analysis and developing an improved rockfall hazard matrix chart. Structural mapping and RocFall software were used to identify parameters influencing rockfall occurrence and monitor kinetic energy variations. The presence of joints and bedding planes weakened the rock mass along R518 road, leading to potential rockfall. Simulations with RocFall highlighted the impact of slope height, vegetation density, slope angle, and rock velocity on the extent of rock fragmentation reach. An improved rockfall hazard rating chart was proposed based on empirical and numerical findings for assessing rockfall hazard levels along highways and roads.