Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (11): 3777-3788.doi: 10.16285/j.rsm.2020.0735

• Geotechnical Engineering • Previous Articles     Next Articles

Stability analysis of high dump with wide graded waste rock

AI Xiao-tao1, 2, WANG Guang-jin1, 2, 3, 4, ZHANG Chao3, HU Bin5, LIU Wen-lian6, MA Hong-lin3, CUI Bo1, 2   

  1. 1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 2. National and Local Joint Engineering Research Center for Green Comprehensive Utilization of Metal Ore Tailings Resources, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 4. Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming, Yunnan 650093, China; 5. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China; 6. Kunming Prospecting Design Institute of China Nonferrous Metal Industry Co., Ltd., Kunming, Yunnan 650051, China
  • Received:2020-05-30 Revised:2020-07-13 Online:2020-11-11 Published:2020-12-25
  • Supported by:
    This work was supported by the National Key Research and Development Program of China(2017YFC0804600), the National Natural Science Foundation of China(U1802243, 41672317) and the Open Fund Project of the State Key Laboratory of Geomechanics and Geotechnical Engineering(Z018017).

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Abstract: The high-bench dump of wide-graded waste rock formed by slope-to-the-bottom has obvious particle size grading characteristics. Traditional stability analysis methods usually simplify it to multi-layer isotropic homogeneous soil, and substantially ignore the uneven and random distribution of each particle group in the dump. This makes it difficult to obtain a reasonable conclusion about the slope stability. Relying on the high-bench dumping site of a copper mine in Jiangxi, with the help of self-edited cellular automata program EPOHHM, five groups of narrow-graded coarse-grained soils are used to characterize the particle size grading phenomenon of high-bench dump, and to simulate the non-uniformity and randomness of the granular media material in each particle group. The displacement field and plastic state of the dump site under different working conditions are analyzed, and the safety and stability of the dump site slope under different dumping modes are systematically discussed. A detailed analysis method for the stability of a high-step dump with wide-graded waste rock is proposed. The research results show that the “tension-shear” failure occurs in the dump; the middle-upper part of the soil has an arc-shaped landslide trend, the deformation of the lower part manifests as settlement, and the top platform produces tensile and shear cracks. Considering only the mechanical strength of the granular media material, increasing the content of coarse particles(d>100 mm) at the bottom plays a significant role in stabilizing the dump. The "full section height dump of single-step" dumping mode is more conducive to the safety and stability of the high-bench dump with wide graded waste rock than "full overlay dump of multi-step". The research results will provide guidance for ensuring the long-term safety and stability of the dump with obvious particle size grading, and also provide a reference for the future analysis of similar engineering problems.

Key words: wide graded waste rock, high waste dump, particle size grading, scale effect, slope stability

CLC Number: 

  • TU 457
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