Geological heritage sites around rock slopes are under the risk of slope slide or rockfall, which can damage to the tracksite and visitors. The dinosaur tracksite in Seoyu-ri, Hwasun is surrounded by two man-made rock slopes which have nearly 90° inclination and numerous discontinuities. A dip/dip direction of northern slope (slope 1) is 86/203 and that of western slope (slope 2) is 88/300. Therefore, slope failure risk is very high, and some fragments of rock produced by rockfall were also detected in a field survey. The characteristics of discontinuities were measured from each slope including orientation, spacing, roughness, weathering, groundwater and so on. The potential rock slope failures were evaluated using stereographic projection and slope mass rating (SMR) classification. The slope 1 has potential risk of planar and wedge failure, and the slope 2 has potential risk of planar failure. The stability of both slopes was classified as IV class, which needs important and corrective treatments. The maximum distances, bounce heights, translational velocities and kinetic energies of rock fragments produced by rockfall were also evaluated. The results show that the rock fragments can damage not only to fossils, but also to visitors. Because the tracksite has high geological and cultural value, the preservation is essential. This research, therefore, suggests the slope stabilization of two slopes to prevent the tracksite from slope failure. The research can be applied to assess rock slope failure risks at other cultural monuments and geological heritages located around rock slopes.

1. Introduction

There is a large amount of dinosaur trace fossils found in Korean peninsula. After Yang (1982) discovered the Dinosaur's footprints at Goseong-gun, many investigators have studied and reported dinosaur trace fossils in Korea (Houck and Lockley, 2006; Minter et al., 2012). There are 20 fossil sites have been designated as natural monuments in Korea. The dinosaur tracksite in Seoyu-ri, Hwasun, which is the study area of this research, was also designated, because of its' high geological and cultural values. However, engineering condition of the site is not stable, because of surrounding unstable steep rock slopes. The slopes have numerous discontinuities, and rock fragments released from the slopes were also observed in field survey. The purpose of this study is to assess the rock slope stability of the site, and suggest proper countermeasures.

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