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Geotechnical and Geological Engineering

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04-06-2020 | Original Paper

Assessment of Rockfall Hazards of Moziyan in Hechuan District, Chongqing, China

Authors: Yuntao Zhou, Shengwei Shi, Hongmei Tang, Linfeng Wang

Published in: Geotechnical and Geological Engineering | Issue 6/2020

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Abstract

Moziyan is an area containing unstable rock masses located in Hechuan District, Chongqing, China and has constantly seen group-occurring rockfalls since 1964. The present study aims to investigate the damage of Moziyan rock mass and protect the mining areas and residential areas from rockfall phenomenon. Mohr–Coulomb model in FLAC–3D Program was built to find out the rockfall initiation position. RocFall program has been used to calculate the distribution curves of stopping positions, bounce height, total kinetic energy, and translational velocity of the falling blocks varying with horizontal distance. According to the simulation results, the stability of Moziyan rock mass is controlled by the unloading cracks behind the slope, and the falling blocks have a maximum bounce height and maximum total kinetic energy of 0 m and 2720.9 kJ respectively at the horizontal position of 461.6 m, where proper protection measures should be adopted to minimize the risk of the damage of the Moziyan rock mass. Conclusively, the results of simulation indicate that a barrier of 3 m height and 3000 kJ absorption capacity is enough to resist the falling stones with a maximum speed of 13.2 m/s at the horizontal position of 461.6 m.

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Title: Assessment of Rockfall Hazards of Moziyan in Hechuan District, Chongqing, China
Authors: Yuntao Zhou
Shengwei Shi
Hongmei Tang
Linfeng Wang
Publication date: 04-06-2020
Publisher: Springer International Publishing
Published in: Geotechnical and Geological Engineering / Issue 6/2020
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-020-01394-3

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