Research on in-situ dewatering and drainage design and engineering application of sludges in open-pit mines

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0013

Abstract

Abstract:

In order to effectively address the complex physical and mechanical challenges of sludge treatment in the Msesa open-pit mine, the hydrogeological conditions and physico-mechanical properties of the sludge body were investigated. Based on numerical simulations combined with engineering practice, a technical system for in-situ sludge dewatering, drainage, and mining suitable for the redevelopment of abandoned pits was proposed. The results show that when four dewatering wells are evenly arranged at the deepest part of the sludge body, the total static drainage time is approximately 45 days, and the sludge storage drainage time is about 29 days, achieving advanced pre-drainage of the sludge body. The proposed dewatering and mining-based dredging scheme demonstrates significant advantages in terms of technical feasibility, economic efficiency, and operational safety, providing a practical and transferable reference for open-pit mine dredging and resource utilization.

Key words: open-pit mine, sludge body, dewatering, mining-based dredging, dredging construction

CLC Number:

X948

ZHENG Bin, WANG Haochen, REN Yi, GAO Yongtao, ZHOU Yu. Research on in-situ dewatering and drainage design and engineering application of sludges in open-pit mines[J]. China Safety Science Journal, 2025, 35(S2): 139-146.

Figures/Tables 9

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样品编号	样品性质	取样深度/ m	TCu/%	CuO/%	Co/%	中值粒径/ μm	含水率/ %	孔隙率/ %	天然密度/ (g·cm^-3)	渗透系数/ (cm·s^-1)
1	淤泥	0~2	1.11	0.97	0.144	8.288	37.22	46.45	1.53	1.103×10^-5
2		2~4	1.42	1.15	0.196	6.641		46.45	1.79
3		4~6	1.30	1.15	0.257	9.251		53.46	1.61
4		6~13	1.72	1.48	0.348	9.147		48.96	1.67
5		13~15	1.50	1.36	0.287	8.762		48.96	1.63
6		15~17	2.02	0.571	0.503	8.573		42.86	1.71
7		17~19	2.08	1.05	0.501	8.749		42.86	1.65
8	细砂	19~20	0.38	—	0.053	4.716	30.25	50.50	1.62	6.907×10^-5
9		20~21	0.69	0.54	0.329	8.798			1.64
10		21~22	0.442	—	0.299	7.723			1.62
11		22~23	0.59	0.42	0.147	3.848		47.63	1.66
12		23~24	0.338	—	0.099	7.32			1.82
13		24~25	0.80	0.68	0.132	12.432			1.79
14	砂砾	25~26	0.241	—	0.039	—	18.22	47.37	2.17	9.076×10^-5
15		26~27	0.61	0.50	0.078	7.326			1.70
16		27~28	0.90	0.77	0.165	6.9			1.82
17		28~29	0.331	—	0.031	5.423			1.85

试验编号	样品编号	取样深度/ m	直剪快剪		固结快剪
试验编号	样品编号	取样深度/ m	黏聚力 c/kPa	内摩擦角/(°)	黏聚力 c/kPa	内摩擦角/(°)
1-1	1~4	0~13	—	—	136.91	25.73
1-2	5~8	13~20	25.14	39.42	—	—
1-3	9~12	20~24	29.39	28.16	—	—
1-4	13~17	24~29	21.55	45.74	—	—

编号	m₀	m₁	m₂	m₃	m₄	m₅
1-1	53.73	46.24	39.80	34.26	29.49	25.38
1-2	135.27	116.42	100.21	86.25	74.24	63.89
1-3	50.32	43.31	37.27	32.08	27.61	23.77
1-4	282.64	243.27	209.39	180.22	155.12	133.51
2-1	105.13	90.48	77.88	67.03	57.70	49.66
2-2	53.21	45.80	39.42	33.93	29.20	25.13
2-3	58.55	50.39	43.37	37.33	32.13	27.65
3-1	99.15	85.34	73.45	63.22	54.41	46.83
3-2	633.90	545.60	469.60	404.19	347.89	299.43

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