<b>Development of an Aerial Survey System and Numerical Analysis Modeling Software for Unstable Rock Blocks</b>

Abstract

The authors have been studying a method for evaluating rock slope stability by applying a non-contact vibration measurement technique. Consideration of the size of the rock block, its shape and conditions supporting it are indispensable for improving the accuracy of the evaluation method. Accordingly, an aerial survey system to observe the shape of the rock block was built. Next, software was developed to automatically generate a three dimensional finite element analysis model from the data collected relating to the shape of the block. Finally, a rockfall risk evaluation technique was proposed using the parametrical analysis results of the FE analysis model regarding loads exerted on and conditions supporting the block.

Indirect method for the quantitative identification of unstable rock

“…However, this approach is often difficult to apply to unstable rocks with a wide distribution in mountainous areas. When the environmental conditions dramatically change, these methods cannot fully reflect the dynamic response of the rock and cannot satisfy the actual dynamic stability evaluation requirements of engineering (Du et al 2015).Therefore, it is necessary to achieve low-cost and long-distance monitoring technology research on rock masses in these high-risk areas (Uehan and Minoura, 2015). As one of the remote technologies, Laser Doppler Vibrometer (LDV) can monitor natural vibration frequency of the rock mass, which can be used for indirect assessment for the strength of rock bridge (Uehan et al, 2012;Ma et al, 2015;Du et al, 2017b;Jia et al, 2019).…”