Influence of rheological characteristics on the fluidization catastrophe of tailings flows  

作　　者：WANG Dao-zheng LIAN Bao-qin WANG Xin-gang CHEN Xiao-qing WANG Jia-ding WANG Fei 

机构地区：[1]State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,China [2]Key Laboratory of Mountain Hazards and Surface Processes,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences(CAS),Chengdu 610041,China

出　　处：《Journal of Mountain Science》2023年第9期2628-2643,共16页山地科学学报（英文）

基　　金：supported by The National Nat ural Science Foundation of China(No.42207184);Nature Science Basic Research Plan in Shaanxi Provi nce of China(No.2022JQ-253)。

摘　　要：Limited by mining technology,mineral exploitation can produce large amounts of tailings.Heavy summer rainfall or seasonal freeze-thaw can lead to physical and chemical modification of tailing material in mountainous areas,resulting in fluidized tailings flow and severe disaster losses.Therefore,aiming at the problem of tailings fluidization catastrophe,this paper tried to reveal the rheological mechanism of tailings fluidization transformation by combining rheological tests and theoretical analysis.The results show that the yield stress increases with decreasing temperature,and when the density of debris flow(ρ)is more than 1.9 g/cm~3,this behavior becomes more pronounced as the density increases.The storage modulus decreases by at least two orders of magnitude at the solid-fluid transition under amplitude test sweep.Storage and loss modulus in the linear viscoelastic range and yield stress have an exponential growth relationship with sediment concentration.In addition,a stress constitutive relation and a new exponential law describing the evolution of yield stress required for solid-liquid transformation were proposed,and the relationship is further strengthened through a comprehensive analysis of existing results,which expands the evaluation application of the rheological characteristics of tailings flow.This paper provides a new insight into the rheological properties of tailing and how they occur through solid-liquid transition under different environments,which is beneficial to geological hazard prevention and the ecological remediation of the mining area.

关 键 词：Debris flow Tailing deposits Rheological properties Solid-liquid transition Yield stress 

分 类 号：P642.2[天文地球—工程地质学] TD926.4[天文地球—地质矿产勘探]