Comprehensive Engineering Geological Analysis on Large-Scale Anti-dip Slopes: A Case Study of Changshanhao Opencast Gold
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ORIGINAL PAPER
Comprehensive Engineering Geological Analysis on LargeScale Anti-dip Slopes: A Case Study of Changshanhao Opencast Gold Mine in China Zhigang Tao . Yufei Liu . Chun Zhu
. Guangcheng Shi . Yanhua Sun
Received: 6 May 2020 / Accepted: 3 September 2020 Springer Nature Switzerland AG 2020
Abstract Flexural toppling failure of large-scale anti-dip slopes constitutes a significantly rare phenomenon. With regard to the large-scale anti-dip slope instability at the southwest stope of Changshanhao Opencast Gold mine, in this work, a field engineering geological survey on the Changshanhao open stope was conducted, to investigate the structural plane features of the corresponding slope rock mass. Moreover, an equatorial horizon projection and strike rose diagram were utilized to determine the preferred structural plane of the joint fissures; the exposed rock mass integrity zoning of slope and the rock sample property testing on the main lithological compositions in the stope were also established. Based on the results of previous field investigations and indoor rock Z. Tao Y. Liu C. Zhu (&) G. Shi State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China e-mail: [email protected] Z. Tao Y. Liu G. Shi School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijng 100083, China C. Zhu School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China Y. Sun School of Civil Engineering, Guizhou University of Engineering Science, Bijie 551700, China
mechanics experiments, along with the occurrence conditions of stratigraphic structures unmasked by existing engineering geology borehole data, geographical explorations and mining engineering, the failure mode of southwest stope slopes were also determined. Finally, several suggestions were provided on the reinforcement and treatment of dangerous slopes within the ultimate mining boundary, consequently laying a foundation for sustainable safe mining. Keywords Anti-dip slope Instability mode determination Structural plane features Engineering geology borehole data
1 Introduction The failure modes of rock anti-dip slopes exist in many engineering slopes, such as water conservancy, hydropower projects, expressways and open-pit mines. Examples such as, Frank landslide in Canada (ADSL 2005), Ghurgar rockfall in Peru, Jinchuan open-pit nickel mine landslide and Huanglashi landslide group in China, pose severe threats to human engineering activities, while economic losses could be imminent. Therefore, the study of the reverse slope is of great significance to the slope treatment, disaster prevention and mitigation.
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Geotech Geol Eng
Many achievements have been made in theory, numerical simulation and experiment. Goodman and Bray (1976) classified the bending and toppling deformation of layered slopes into three basic types such as, Flexural toppling, Block toppling and Block
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