Rock slope stability analysis of a limestone quarry in a case study of a National Cement Factory in Eastern Ethiopia

被引:6
|
作者
Bezie, Getaneh [1 ]
Chala, Endalu Tadele [2 ,4 ]
Jilo, Nagessa Zerihun [2 ]
Birhanu, Sisay [1 ]
Berta, Kalkidan Kefale [3 ]
Assefa, Siraj Mulugeta [2 ]
Gissila, Biruk [2 ]
机构
[1] Dire Dawa Univ, Inst Technol, Dept Civil Engn, Dire Dawa, Ethiopia
[2] Addis Ababa Sci & Technol Univ, Coll Engn, Dept Civil Engn, Addis Ababa, Ethiopia
[3] Ambo Univ, Sch Civil & Environm Engn, Dept Civil Engn, Woliso Campus, Woliso, Ethiopia
[4] O Min Grp, Addis Ababa, Ethiopia
来源
SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期
关键词
Geometric profile; Kinematic analysis; Numerical analysis; Parametric study; Quarry cut slope; Rock slope failure; OPEN-PIT MINES; NUMERICAL-ANALYSIS; SHEAR-STRENGTH; FAILURE;
D O I
10.1038/s41598-024-69196-8
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Rock slope failures pose significant challenges in geotechnical engineering due to the intricate nature of rock masses, discontinuities, and various destabilizing factors during and after excavation. In mining industries, such as national cement factories, multi-benched excavation systems are commonly used for quarrying. However, cut slopes are often designed with steep angles to maximize economic benefits, inadvertently neglecting critical slope stability issues. This oversight can lead to slope instability, endangering human lives and property. This study focuses on analyzing the stability of existing quarry cut slopes, estimating their final depth, and conducting a parametric study of geometric profiles including bench height, width, face angle, and rump width. Kinematic analysis helps identify potential failure modes. The results reveal that the existing quarry cut slope is prone to toppling, wedge failure, and planar failure with probabilities of 42.68%, 19.53%, and 14.23%, respectively. Numerical modeling using the finite element method (Phase2 8.0 software) was performed under both static and dynamic loading conditions. The shear reduction factor (SRF) of the existing quarry cut slope was 1.01 under static loading and 0.86 under dynamic loading. Similarly, for the estimated depth, the SRF was 0.82 under static loading and 0.7 under dynamic loading. These values indicate that the slope stability falls significantly below the minimum acceptable SRF, rendering it unstable. The parametric study highlights the face angle of the bench as the most influential parameter in slope stability. By adjusting the bench face angle from 90 degrees to 75 degrees, 70 degrees, and 65 degrees, the SRF increased by 31.6%, 35.4%, and 37.9%, respectively. Among these, a 70 degrees bench face angle is recommended for optimal stability with a SRF of 1.27 under static loading and 1.18 under dynamic loading.
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页数:26
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