MOVEMENT CHARACTERISTICS AND RISK ASSESSMENT OF MINE DEBRIS FLOW BASED ON FLO-2D SIMULATION: A Case Study of the Debris Flow in Bojigou Mine of Minxian County, Gansu Province

LIU De-yu; JIANG Xing-bo; LI Bao-qiang

doi:10.13686/j.cnki.dzyzy.2022.05.014

2022 Vol. 31, No. 5

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LIU De-yu, JIANG Xing-bo, LI Bao-qiang. MOVEMENT CHARACTERISTICS AND RISK ASSESSMENT OF MINE DEBRIS FLOW BASED ON FLO-2D SIMULATION: A Case Study of the Debris Flow in Bojigou Mine of Minxian County, Gansu Province[J]. Geology and Resources, 2022, 31(5): 693-699. doi: 10.13686/j.cnki.dzyzy.2022.05.014

Citation:

LIU De-yu, JIANG Xing-bo, LI Bao-qiang. MOVEMENT CHARACTERISTICS AND RISK ASSESSMENT OF MINE DEBRIS FLOW BASED ON FLO-2D SIMULATION: A Case Study of the Debris Flow in Bojigou Mine of Minxian County, Gansu Province[J]. Geology and Resources, 2022, 31(5): 693-699. doi: 10.13686/j.cnki.dzyzy.2022.05.014

MOVEMENT CHARACTERISTICS AND RISK ASSESSMENT OF MINE DEBRIS FLOW BASED ON FLO-2D SIMULATION: A Case Study of the Debris Flow in Bojigou Mine of Minxian County, Gansu Province

1.
Key Laboratory for Groundwater Engineering and Geothermal Resources of Gansu Province, Lanzhou 730050, China
2.
Gansu Institute of Geological Environment Monitoring, Lanzhou 730050, China

Received Date: 23 August 2021

Revised Date: 25 October 2021

Publish Date: 25 October 2022

Abstract

Abstract

The human mining activities in Bojigou gold mine of Minxian County cause debris flow. The FLO-2D software is used to simulate and analyze the movement characteristics of Bojigou debris flow under the frequency of rainfall return periods of 50 a and 100 a. On this basis, the risk assessment and zoning are carried out, and the accuracy is verified by actual situation. The results show that parameters of movement characteristics such as the range of alluvial fan, accumulation depth and average velocity of debris flow increase with the increase of rainfall return period. The accumulation depth and velocity in the middle part of alluvial fan are significantly larger than those in the wings and front end. The hazardous areas of debris flow are concentrated in a certain range at the gully and gully mouth. The proportion of high risk area increases from 48% to 54.0% with the longer rainfall return period. The simulation results are basically consistent with the actual situation through accuracy verification, which are reliable in application.
- mine debris flow /
- FLO-2D simulation /
- risk assessment /
- rainfall frequency /
- Gansu Province

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References

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