Seepage and stability analysis of pore air pressure on a high-bench dump under heavy rainfall

CUI Bo; WANG Guang-jin; LIU Wen-lian; HU Bin; AI Xiao-tao; CUI Zhou-quan; WANG Meng-lai; ZHOU Zong-hong

doi:10.13374/j.issn2095-9389.2020.09.01.005

Volume 43 Issue 3

Mar. 2021

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Chinese Journal of Engineering > 2021 > 43(3): 365-375. > DOI: 10.13374/j.issn2095-9389.2020.09.01.005

CUI Bo, WANG Guang-jin, LIU Wen-lian, HU Bin, AI Xiao-tao, CUI Zhou-quan, WANG Meng-lai, ZHOU Zong-hong. Seepage and stability analysis of pore air pressure on a high-bench dump under heavy rainfall[J]. Chinese Journal of Engineering, 2021, 43(3): 365-375. DOI: 10.13374/j.issn2095-9389.2020.09.01.005

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Seepage and stability analysis of pore air pressure on a high-bench dump under heavy rainfall

1.
National and Local Joint Engineering Research Center for Green Comprehensive Utilization of Metal Ore Tailings Resources, Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
2.
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming 650093, China
3.
Yunnan Key Laboratory of Geotechnical Engineering and Geohazards, Kunming Prospecting Design Institute of China Nonferrous Metal Industry Co., Ltd, Kunming 650051, China
4.
School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
5.
National Engineering and Technology Center for Development & Utilization of Phosphate Resources, Yunnan Phosphate Group Co., LTD, Kunming 650113, China

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Corresponding author:
WANG Guang-jin, E-mail: wangguangjin2005@163.com
Received Date: August 31, 2020
Available Online: November 17, 2020
Published Date: March 25, 2021

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Abstract

Abstract

Under heavy rainfall, the pore air pressure in the unsaturated zone of a dump hinders rainwater infiltration in loose soil, which further affects the safety and stability of the dump. However, traditional analysis methods often regard pore air pressure as atmospheric pressure and ignore its impact on dump safety. Relying on the high bench dump project of a copper mine in Jiangxi, basing on the field test and survey results and combing with the horizontal slice of a typical dump profile, the seepage law and safety stability of a high bench dump with traditional methods while considering the pore air pressure were analyzed. Moreover, the influence of pore air pressure on a wet front, pore water pressure, and slope safety factors of high bench dump under heavy rainfall conditions were discussed. The research results show that pore air pressure at the initial stage of rainfall infiltration is not significant, and pore air pressure does not have a direct impact on the stability of the high bench dump. However, as the rainfall continues, the effect of the pore air pressure begins to appear, reducing the infiltration rate of the high bench dump. Further, the downward movement speed of the wetting front becomes slower, the pore water pressure rises slowly, and the influence of the heavy rainfall delays the stability of the high bench dump. In the middle of rainfall infiltration, the pore air pressure remains constant, the delay effect varies, and the penetration depth increases. In the late stage of rainfall infiltration, when the wetting front moves down to the critical plane of the layering, the pore air pressure balance is destroyed, continuing to increase to a new constant value, which increases the impact on the high bench dump. When the traditional method of wetting front and considering the pore air pressure of wetting front move down to the same depth, the safety factor of the high bench dump under the action of pore air pressure is obviously reduced. The research results provide a theoretical basis for long-term safe operation and disaster monitoring and early warning of high bench dump under heavy rainfall conditions.
- high bench dump,
- heavy rainfall,
- wetting front,
- pore air (water) pressure,
- slope stability

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Seepage and stability analysis of pore air pressure on a high-bench dump under heavy rainfall

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