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| Experiment on critical threshold value of rainfall induced by natural caving method for underground debris flow |
| Received:May 27, 2022 Revised:June 01, 2022 |
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| DOI： |
| KeyWord:natural caving; fine-grained moraine; underground mudslides; rainfall threshold; outbreak time |
| Author | Institution |
| LI Zhijun |
．云南迪庆有色金属有限责任公司 |
| NIU Xiangdong |
昆明理工大学 国土资源工程学院 |
| ZENG Qingtian |
．云南迪庆有色金属有限责任公司 |
| HOU Kepeng |
昆明理工大学 国土资源工程学院 |
| LI Zhengrong |
．云南迪庆有色金属有限责任公司 |
| WU Ming |
．云南迪庆有色金属有限责任公司 |
| PENG Zhang |
．云南迪庆有色金属有限责任公司 |
| WEI Yinhong |
．云南迪庆有色金属有限责任公司 |
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| Abstract: |
| The rainfall threshold is a critical hydrodynamic condition for the formation of downhole debris flow and an important parameter for preventing and controlling the formation of downhole debris flow. In this paper, the indoor similar simulation test is used as a research method to study the rainfall threshold and outbreak time of the mud-rock flow induced by the Pulang copper mine. The results show that: 1) When the rainfall intensity is 0.563 mL/min, it will induce a large-energy downhole debris flow. When the rainfall intensity is 0.293 mL/min, there is the potential for the occurrence of underground debris flow. When the rainfall intensity is 0.186 mL/min, there will be no downhole debris flow. 2) Rainfall intensity 0.293 mL/min is the limit critical state for the occurrence of downhole debris flow, and rainfall intensity 0.293 mL/min is the rainfall threshold value for inducing downhole debris flow. 3) When the rainfall intensity is 0.563 mL/min, the eruption times of the underground debris flow induced by different ore outlets of 3#, 4#, and 2# are 240 min, 260 min, and 220 min, respectively. When the rainfall intensity is 0.293 mL/min, the outburst times of underground debris flow induced by the 3#, 4#, and 2# ore exits are 180 min, 200 min, and 220 min, respectively. Finally, based on the principle of the total amount of water, the scientificity and rationality of the experimental determination of the rainfall threshold are verified. The research results in this article can provide the theoretical basis for the prevention and control of downhole debris flow in the Pulang copper mine and similar mines. |
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