Application research of slope monitoring and treatment technology in ecological restoration of open-pit coal mines in alpine mining areas

LI Congcong; WANG Tong; ZHAO Xin; LI Fei; LIN Nan; JIANG Xiaoguang; WANG Weichao

doi:10.12075/j.issn.1004-4051.20230960

CHINA MINING MAGAZINE > 2024 > 33(4): 122-131. > DOI: 10.12075/j.issn.1004-4051.20230960

LI Congcong，WANG Tong，ZHAO Xin，et al. Application research of slope monitoring and treatment technology in ecological restoration of open-pit coal mines in alpine mining areas [J]. China Mining Magazine，2024，33（4）：122-131. DOI: 10.12075/j.issn.1004-4051.20230960

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Application research of slope monitoring and treatment technology in ecological restoration of open-pit coal mines in alpine mining areas

LI Congcong^{1, 2,},
WANG Tong^{1, 3, ,},
ZHAO Xin⁴,
LI Fei⁵,
LIN Nan²,
JIANG Xiaoguang²,
WANG Weichao⁶

1.
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
2.
China Coal Aerial Photogrammetry and Remote Sensing Group Co., Ltd., Xi’an 710199, China
3.
China National Administration of Coal Geology, Beijing 100038, China
4.
Carbon Neutral Research Institute, China National Administration of Coal Geology, Beijing 100039, China
5.
Guangdong Bureau of Coal Geology of China National Administration of Coal Geology, Guangzhou 510170, China
6.
Qinghai Bureau of Coal Geology of China National Administration of Coal Geology, Xining 810015, China

More Information

Received Date: December 29, 2023
Revised Date: January 18, 2024
Accepted Date: January 25, 2024
Available Online: April 18, 2024

Graphical Abstract

Abstract

Abstract

Slope treatment is one of the important contents of ecological restoration in open-pit mines. Taking Juhugeng Area, Muli Mining Area, Qinghai Province as an example, this paper systematically studies the identification, monitoring and treatment of slope problems in open-pit coal mines in alpine mining areas. The development characteristics and stability of unstable slopes in the mining areas are studied by means of remote sensing, geophysical prospecting, drilling and surface measurement. The results show that an unstable slope exploration and monitoring system of “aerospace-low altitude-ground-time” is established with remote sensing technology as the core, supplemented by conventional surface monitoring, geological survey, geophysical prospecting and drilling. The development characteristics and stability of unstable slopes in the mining area are determined. It provides a basis for targeted slope treatment in ecological restoration and management of mines. Using the high-risk slag hill load reduction and slope reduction treatment technology, the slope steps are cleared, the disasters such as pumice and collapse are eliminated, the slag hill slope is cut and unloaded, and the mining pit slope and slag hill slope are stabilized. Taking the south slag hill of Juhugeng well 4 as an example, according to the high-density electrical method detection and drilling verification, two slip surfaces of the permafrost upper limit and the boundary line between the slag soil layer and the original pit bedrock are identified. It is determined that the excessive load of the trailing edge is the main factor leading to the landslide. The treatment scheme of “trailing edge load reduction + slope reduction + water system connectivity + comprehensive monitoring” is adopted. After treatment, the load on the leading edge of the slope is eliminated, and the stable site conditions for the later vegetation regreening are provided. Multi-stage dynamic monitoring shows that the trailing edge of the slope has been stabilized. Slope monitoring and treatment technology has been widely used in ecological restoration and management of Muli Mining Area. The slope control of slag hill slope after treatment is less than 26°, which effectively eliminates the influence of unstable slope on restoration and management, and ensures the effectiveness of mine ecological restoration and management.
- ecological restoration of mine,
- unstable slope,
- slope monitoring,
- alpine mining area,
- open-pit mine

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References (31)

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