西南交通大学学报2025，Vol.60Issue(5)：1139-1148,1159,11.DOI:10.3969/j.issn.0258-2724.20230525
基于关键块理论的井下泥石流机理力学模型
Mechanical Model of Downhole Debris Flow Mechanism Based on Key Block Theory
摘要
Abstract
To achieve quantitative and precise prevention and control of downhole debris flows in mines mined by the natural caving method,a large-scale laboratory experimental method for downhole debris flow was employed by taking the Plan copper mine as a case study.The channel types and inducing mechanism of the downhole debris flow formation were analyzed,revealing the critical conditions for the occurrence of downhole debris flow.The key block theory was applied to conduct a mechanical analysis of the key block of downhole debris flows under critical conditions.A mechanical model of the inducing mechanism of the downhole debris flow was constructed,and the theoretical critical ore yield induced by the natural caving method was deduced.The results show that under non-uniform ore drawing conditions,three types of debris flow channels are prone to form in the caved ore layer:straight ore drawing channels,separated layer channels,and curved channels.The spatiotemporal evolution mechanism of the formation of a downhole debris flow involves four stages:formation and expansion of the debris flow channel,migration and accumulation of source material,accumulation of runoff water from rainfall,and induction through vibration factors.The critical condition for inducing downhole debris flow is the formation of a certain separation space at the interface between the moraine layer and the ore layer.The accuracy and reliability of the model were verified by the occurrence frequency and reduction rate of underground debris flow in the Plan copper mine from 2019 to 2022.关键词
自然崩落法/井下泥石流/关键块理论/机理力学模型/试验研究Key words
natural caving method/downhole debris flow/key block theory/mechanical model of mechanism/experimental study分类
矿业与冶金引用本文复制引用
牛向东,侯克鹏,孙华芬..基于关键块理论的井下泥石流机理力学模型[J].西南交通大学学报,2025,60(5):1139-1148,1159,11.基金项目
云南省科学技术厅项目(KKS0202121020) （KKS0202121020）
