Investigating the stability and anchor support parameters of slopes subjected to wetting and drying cycles in relation t
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ORIGINAL PAPER
Investigating the stability and anchor support parameters of slopes subjected to wetting and drying cycles in relation to the Nanfen open-pit mine, China Jiamin Wang 1,2
&
David Chapman 2 & Xiaojie Yang 1
Received: 7 May 2020 / Accepted: 22 September 2020 # Saudi Society for Geosciences 2020
Abstract Periodic rainfall and evaporation have a major influence on slope instability. In order to explore the changes in seepage characteristics and the stability of slopes under wetting–drying cycles, finite element numerical simulations have been conducted using a case study of the Nanfen open-pit mine in China. The slope stability analysis has been based on the strength reduction method and the effectiveness of anchors was also studied. The results showed that the slope safety factor decreased nonlinearly under the action of the wetting–drying cycles. The pore water pressure of the slope responded quickly to the wetting–drying cycles and had a certain lag, which changed periodically with the process of rainfall and evaporation. When strengthening the slope with anchors, the effects of the anchoring parameters such as anchor length, inclination angle, and installation position on the slope reinforcement effect needs to be investigated. The change in anchor parameters was found to affect the position and depth of the potential sliding surface, thus affecting the stability of the slope. When installing anchors in a slope, the combined effect of the favorable parameters should be considered to ensure a balance between the benefits of the anchor in improving the stability of a slope and the associated economics of the anchoring system. Keywords Wetting–drying cycle . Slope stability . Anchor reinforcement . GeoStudio
Introduction Water is an important factor affecting the mechanical properties of rock and hence the stability of slopes, and the stability of high and steep slopes is one of the main factors affecting the safe production of open-pit mines (Kristo et al. 2017; Eang et al. 2018; Yang et al. 2018; Xing et al. 2019; Karim et al. 2019). As one of the largest single open-pit mines in Asia, Nanfen openpit mine has been affected by special geological conditions and long-term mining, resulting in frequent accidents such as slope collapses and landslides, which is threatening the sustainable Responsible Editor: Murat Karakus * Jiamin Wang [email protected] 1
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China
2
School of Engineering, University of Birmingham, B152TT, Birmingham, UK
production of the mine and the safety of personnel and equipment (Tao et al. 2018a; Zhang et al. 2020). According to statistical data of the recorded rainfall and sliding force monitoring system at the Nanfen mine, there are more significant changes in the sliding force during periods of concentrated rainfall, especially rainstorms, which indicates that rainfall is an important factor related to slope instability (Yang et al. 2016). The i
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