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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 method of empirical estimation for each parameter of the equivalent linear method is summarized. The factors affecting the maximum dynamic shear modulus, damping ratio curve, dynamic modulus attenuation curve and previous studies are summarized. The dynamic deformation characteristics of various types of tailings are summarized and the dynamic attenuation curves of the tailings, such as tailings silt, tail silt and tail silty clay, are obtained. It is verified that the normalized shear strain of the tailings can be used to obtain the different surrounding The correctness of the dynamic modulus attenuation curve of the material is depressed, and the method is applied to the tailings to obtain the dynamic modulus attenuation curve of the tailings under the high confining pressure. Under different confining pressures, the tailing and natural earth moving Modulus comparison, some of the characteristics of the tailings. The results show that the dynamic modulus attenuation curve of the material under high confining pressure can be calculated by normalizing the reference shear strain from the dynamic modulus decay curve under low confining pressure. The confining pressure dependence can be expressed by the parameter k To represent. Different materials have different dependence on confining pressure. The average value of k in sand is 0.5 and the average value of cohesive soil is 0.4. For tailings, the tail silt is 0.4 and the tailing silt is 0.3.