尾矿的动力应力-应变特性  

DYNAMIC STRESS-STRAIN CHARACTERISTICS OF TAILINGS

作　　者：袁泽川 YUAN Zechuan(Central Research Institute of Building and Construction, MCC Group, Beijing 100088, China)

机构地区：[1]中冶集团建筑研究总院有限公司地基所,北京100088

出　　处：《工业建筑》2017年第10期139-145,共7页Industrial Construction

摘　　要：对等效线性方法的各个参数的经验估计方法进行了总结,对土的最大动剪切模量、阻尼比曲线、动模量衰减曲线的影响因素和前人所做的研究进行了归纳,通过对各类尾矿动力变形特性的试验总结,得到了以尾粉砂、尾粉土、尾粉质黏土为代表的尾矿动模量衰减曲线,验证了用参考剪应变归一化得到不同围压下材料动模量衰减曲线的正确性,并将该方法用于尾矿,得到了高围压下尾矿的动模量衰减曲线,在不同围压下,将尾矿与天然土的动模量进行对比,得到了尾矿的一些特性。结果表明:材料在高围压状态下的动模量衰减曲线可以由低围压状态下的动模量衰减曲线将参考剪应变归一化的方法计算得到,其围压依赖性可以用参数k来表示。不同的材料对围压的依赖性不同,砂土的k平均取值为0.5,黏性土的平均取值为0.4,而对于尾矿,尾粉砂为0.4,尾粉土为0.3。The empirical estimate methods for the parameters of the equivalent linear method were summarized. The influence factors of the maximum dynamic shear modulus,the damping ratio curves and the dynamic modulus attenuation curves of the soil were summarized as well as the experimental studies carried out by the predecessors. In the paper,the dynamic modulus attenuation curves of the tailings,which were tail silty and tail silt and tail silty clay were obtained. The results showed that the shear strain was normalized by reference shear strain and the method was applied to tailings,and the dynamic modulus attenuation curves of tailings under high confining pressure were obtained. Under different confining pressures,the dynamic modulus of the tailings and natural soil were compared,and some of the features of the tailings were obtained. The results showed that the dynamic modulus attenuation curves of the material under high confining pressure could be calculated by the method of normalizing the shear modulus by the dynamic modulus attenuation curves in the low confining pressure state. The confining pressure dependence could be determined by the parameter k. The average value of the sand was 0. 5,and the average value of the clayey soil was 0. 4,and for the tailings,the tail silty sand was 0. 4,the tail silt is 0. 3.

关 键 词：尾矿 动力变形特性 高围压 

分 类 号：TD926.4[矿业工程—选矿]