磷尾矿电阻率与其力学性质关系的试验研究  

EXPERIMENTAL STUDY OF RELATIONSHIP BETWEEN ELECTRIC RESISTIVITY AND MECHANICAL PROPERTIES OF PHOSPHATE TAILINGS

作　　者：徐佳俊[1,2] 魏作安[1,2] 陈宇龙[3] 杨永浩[2] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [2]重庆大学资源及环境科学学院,重庆400030 [3]东京大学土木工程系

出　　处：《岩石力学与工程学报》2014年第10期2132-2137,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(11372363);江西省"赣鄱英才555工程"

摘　　要：以磷尾矿为对象,采用二相电极法,研究含水率、干密度、温度等因素对磷尾矿电阻率的影响。利用改装的三轴剪切仪对磷尾矿试件进行三轴剪切试验的同时,测量电阻率的变化,获得磷尾矿的黏聚力和内摩擦角与初始电阻率的关系,以及磷尾矿应力–应变–电阻率关系曲线。试验结果表明,磷尾矿的电阻率随着含水率、温度、干密度的增加呈递减的趋势;磷尾矿的初始电阻率与剪切强度、黏聚力和内摩擦角呈负相关性;在三轴剪切压缩过程中,磷尾矿的电阻率随着应变的增加呈先增加后减小的趋势。The impacts of moisture content, dry density, temperature and other factors on the electric resistivity of phosphate tailings are studied using the method of two-phase electrode. Modified triaxial apparatus is used to conduct triaxial tests on the specimen of phosphate railings to obtain the stress-strain curves and the changes of electric resistivity synchronously. Then stress-strain-electric resistivity curve and the relationships between the electric resistivity and the cohesion and internal friction angle are obtained. Results show that the electric resistivity of phosphate railings decreases with the increase of water content, temperature and dry density. The initial electric resistivity correlated negatively with the shear strength, the cohesion and the internal friction angle. During the triaxial compression process, the electric resistivity of phosphate tailings increases initially and then decreases with the growing of strain.

关 键 词：土力学 磷尾矿 电阻率 力学性质 影响因素 同步三轴试验 

分 类 号：TU411[建筑科学—岩土工程]