Study on the Effect of Moisture Content on the Shear Strength of the Overburden Covered by the Block Caving Method at Pulang Copper Mine

WEN Yiming; NIU Xiangdong; WEN Yao; CHENG Yong; NIE Qi; LU Ping

doi:10.13779/j.cnki.issn1001-0076.2024.04.011

2024 Vol. 44, No. 4

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Article navigation > Conservation and Utilization of Mineral Resources > 2024 > 44(4): 93-101

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WEN Yiming, NIU Xiangdong, WEN Yao, CHENG Yong, NIE Qi, LU Ping. Study on the Effect of Moisture Content on the Shear Strength of the Overburden Covered by the Block Caving Method at Pulang Copper Mine[J]. Conservation and Utilization of Mineral Resources, 2024, 44(4): 93-101. doi: 10.13779/j.cnki.issn1001-0076.2024.04.011

Citation:

WEN Yiming, NIU Xiangdong, WEN Yao, CHENG Yong, NIE Qi, LU Ping. Study on the Effect of Moisture Content on the Shear Strength of the Overburden Covered by the Block Caving Method at Pulang Copper Mine[J]. Conservation and Utilization of Mineral Resources, 2024, 44(4): 93-101. doi: 10.13779/j.cnki.issn1001-0076.2024.04.011

Study on the Effect of Moisture Content on the Shear Strength of the Overburden Covered by the Block Caving Method at Pulang Copper Mine

1.
Faculty of Metallurgy and Mining Engineering, Kunming Metallurgy College, Kunming 650033, Yunnan, China
2.
Faculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
3.
Key Laboratory of Critical Minerals Metallogeny in Universities of Yunnan Province, School of Earth Sciences, Yunnan University, Kunming 650500, Yunnan, China

More Information

Corresponding author: NIU Xiangdong, 1194846856@qq.com

Received Date: 09 August 2024

Publish Date: 15 August 2024

Abstract

Abstract

The material characteristics of the overburden layer is an important factor for the success of the natural caving method. The overburden of the natural caving mining method in Plan copper mine is a granular body of plateau moraine, whose shear strength parameters are closely related to moisture content. Based on the direct shear test method, the shear strength parameters of moraine at high altitude were obtained under different water content conditions, the relationship between moisture content and shear strength parameters of moraine debris was also discussed. The results were as follows: the cohesion and internal friction angle of plateau moraine particles decreased with the increase of moisture content. There was a strong logarithmic relationship between cohesion and moisture content, and an exponential relationship between internal friction angle and moisture content. Based on the law of variation between shear strength parameters and water content of moraine, cohesion was more sensitive to the change of water content, while internal friction angle was less sensitive to the change of water content. The results showed that the sensitivity of cohesion to water content was stronger than that of internal friction angle. The effect of moisture content on the shear strength of moraine debris was mainly reflected by the change of cohesion. The research results in this paper can provide some theoretical basis for the study of glacial till cover layers in high−altitude areas.
- sublevel caving method /
- moisture content /
- moraine debris /
- shear strength /
- cohesion /
- internal friction angle

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References

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