Study on High and Steep Slope Stability and Slope Angle Optimization of Open-Pit Based on Limit Equilibrium and Numerica
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ORIGINAL PAPER
Study on High and Steep Slope Stability and Slope Angle Optimization of Open-Pit Based on Limit Equilibrium and Numerical Simulation Yaodong Zhou . ping Zou . Feifei Wang Zeng Ma
. Zhengyu Liu . Wanjie Hu .
Received: 20 February 2020 / Accepted: 25 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract The stability of open-pit slope is related to mine safety, especially for high and steep slope. In order to obtain the design slope stability and slope angle optimization of K mine open-pit in Myanmar, limit equilibrium analysis method and three-dimensional numerical simulation are used to carry out the study on the slope stability. The results show that: (1) The safety factor of the designed slope is larger than the allowable safety factor by using the limit equilibrium analysis, which belongs to the stable slope. Some areas can be optimized for design. (2) Through threedimensional numerical analysis, the design slope and the optimized slope are both stable. The area with large deformation of the optimized slope is mainly concentrated in the area of 562 m level moderately weathered pyroclastic rock in area A and 560 m level moderately weathered rock in area B. The calculation
results of three-dimensional numerical simulation are basically consistent with the results of the limit equilibrium analysis. (3) Compared with the designed slope, the potential sliding surface position of the optimized slope is lower. The safety factor is smaller, but larger than the allowable safety factor. The shape of the sliding surface of the whole slope is nearly circular arc. The sliding mode of the slope is circular arc sliding. (4) The reasonable slope angle of different engineering geological divisions of the open-pit slope of K mine is determined. The overall slope angle of area A is B 46°. The overall slope angle of area B is B 44°. The overall slope angle of area C is B 45°. The overall slope angle of area D is B 50°. The research results can provide reference for mine safety production. Keywords Mining engineering Slope engineering Open pit slope Numerical simulation Slope stability
Y. Zhou Wanbao Ming Ltd., Beijing 100053, China p. Zou F. Wang (&) Z. Liu W. Hu Z. Ma State key Laboratory of Safety Technology of Metal Mines, Changsha 410012, Hunan, China e-mail: [email protected] p. Zou F. Wang Z. Liu W. Hu Z. Ma Changsha Institute of Mining Research Co., Ltd, Changsha 410012, Hunan, China F. Wang School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
1 Introduction Since the twentieth century, the proportion of open-pit mining at home and abroad has been increasing. In recent years, with the rapid development of industry, the demand for mineral resources is growing. Most of the open-pit mines turn to deep mining and begin to develop and utilize the deep open-pit mines. In the mining process of deep open-pit mine, the slope
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Geotech Geol Eng
stability is getting worse with the increase of mining depth
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