摘要
泥石流体的屈服应力是泥石流体抗剪强度的一个重要指标,但到目前为止对泥石流体屈服应力和黏土矿物的关系研究还不完善。通过简易泥石流排导槽装置,选取蒙脱石、伊利石、绿泥石、高岭土4种常见的黏粒矿物为研究变量,以泥石流体屈服应力为研究目标,依次改变泥石流体中泥沙颗粒体积浓度、黏粒矿物成分及百分含量得出:(1)同等条件下,不同黏土成分对屈服应力的影响不同,蒙脱石影响最强,伊利石次之,绿泥石、高岭土最弱;(2)单一黏土矿物条件下,屈服应力与黏土矿物关系呈正向指数关系;(3)混合黏土矿物条件下,屈服应力与黏粒矿物的关系与单一黏土矿物条件下关系一致,但变化速率比单一黏土矿物小;(4)通过国内外学者资料验证本文泥石流屈服应力与黏土矿物的关系,具有一定的准确性和可用性。
The yield stress of a debris flow is one of the most important parameters, but there is no better method for clay minerals with the yield stress. The effect of four types of clay minerals （ montmorillonite, illite, chlorite, and kaolin） on the yield stress of mixtures were investigated in aquantitative way. Laboratory experiments were carried out with single and mixed clay mineral types, various volumetric concentrations, and percentages of clay mineral content. By comparing with the results of the laboratory experiment, the following results were obtained. Composition and content of clay mineral and yield stress of debris flow has a very close relationship ： for the same clay content and same volumetric concentration, a decreasing effect was found, respectively, of montmorillonite 〉 illite 〉 chlorite 〉 kaolinite on the yield stress of the flow mixture, whereas the effect of chlorite was equal to that of kaolin. An equation is proposed to calculate the yield stress of debris flows as a function of the volumetric concentration andequivalent clay mineral percentage. The formula is applicable for the calculation of yield stress of single clay and mixed clay type minerals indebris flows.
出处
《科学技术与工程》
北大核心
2017年第21期202-207,共6页
Science Technology and Engineering
基金
国家自然科学基金(41372366)
四川省教育厅基金(16ZB0407)
成都理工大学工程技术学院青年科学基金(C122016020)资助
关键词
泥石流
屈服应力
黏粒矿物
固体体积浓度
debris flow yield stress clay minerals volumetric concentration
