自然崩落法诱发井下泥石流降雨临界阈值试验  

Experiment on critical threshold value of rainfall induced by natural caving method for underground debris flow

作　　者：李志钧 牛向东[2,3] 曾庆田 侯克鹏 李争荣[1,2,3] 吴明 彭张 魏银鸿[1] LI Zhijun;NIU Xiangdong;ZENG Qingtian;HOU Kepeng;LI Zhengrong;WU Ming;PENG Zhang;WEI Yinhong(Yunnan Diqing Nonferrous Metals Co.,Ltd.,Diqing Yunnan 674400,China;School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,Kunming 650093,China)

机构地区：[1]云南迪庆有色金属有限责任公司,云南迪庆674400 [2]昆明理工大学国土资源工程学院,昆明650093 [3]云南省中-德蓝色矿山与特殊地下空间开发利用重点实验室,昆明650093

出　　处：《有色金属（矿山部分）》2022年第5期79-85,共7页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金资助项目(51964023);云南省基金人培项目(KKSY201521064)。

摘　　要：诱发井下泥石流灾害的降雨阈值是矿山井下泥石流防控重要参数。为获得普朗铜矿诱发井下泥石流的降雨临界阈值,以室内试验为研究方法,开展矿区不同降雨强度工况下诱发井下泥石流的降雨阈值及暴发时间研究。结果表明:当雨强为0.563 mL/min时发生破坏性较大井下泥石流概率较大,当雨强为0.293 mL/min时诱发井下泥石流概率较小,当雨强为0.186 mL/min时则不易形成井下泥石流;降雨强度0.293 mL/min是井下泥石流发生的极限临界状态,是诱发井下泥石流的降雨阈值;降雨强度0.563 mL/min时,3#、4#和2#不同放矿口诱发井下泥石流的暴发时间分别为240、260和220 min;降雨强度0.293 mL/min时,3#、4#和2#放矿口诱发井下泥石流的暴发时间分别为180、200和220 min;最后基于水量总量原理验证了试验确定降雨临界阈值的科学性和合理性。研究成果为普朗铜矿及类似矿山井下泥石流的预防和管控提供重要的科学理论依据。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.

关 键 词：自然崩落法 细粒冰碛物 井下泥石流 降雨临界阈值 暴发时间 

分 类 号：TD853.36[矿业工程—金属矿开采] TD862.1[矿业工程—矿山开采] P642.23[天文地球—工程地质学]