Experimental study on dynamic modulus and damping ratio of phosphogypsum
Recent years,the production and accumulation of phosphogypsum waste residue have multiplied,which has brought great hidden trouble to the safety of reservoir area and environment.In this paper,the dynamic characteristics of the phosphogypsum waste residue from Yangjiaqing phosphogypsum storage yard at different depths are tested by GDS-DYNTTS microcomputer controlled vibration triaxial test system.The dynamic elastic modulus,Ed and damping ratio λ of the waste residue are studied in detail under the condition of large confining pressure and bias pressure consolidation.The experimental results show that under the same density,the dynamic elastic modulus increases with the increase of consolidation ratio and confining pressure,and the change rate of dynamic strain εd curve is little at the beginning of the increase,and the dynamic elastic modulus decreases rapidly after εd exceeds 0.01%,and then gradually becomes flat.Using Kondner's model,it is found that the inverse of the maximum dynamic elastic modulus has a good linear relationship with the dynamic strain curve.The dynamic modulus ratio(Ed/Ed0)curve was normalized to obtain the variation trend of the dynamic modulus and dynamic strain,and the decay stages of phosphogypsum dynamic modulus ratio were divided according to Darendeli's model.The least square method is used to fit the damping ratio and the λ-Ed/Ed0 distribution of dynamic elastic modulus ratio,and the empirical model curve with good normality is obtained.
dynamic triaxial testphosphogypsumbias consolidationdynamic modulusdamping ratio
万方数据
维普
