Experimental Study On Liquefaction And Characteristics Of Post-liquefaction Deformation In Tailings Slity Sand

In China,most of tailings dams adopt the upstream type of dam construction method.The saturation line of the dam is high,and the accumulated tailings are not dense enough.Therefore,vibration and liquefaction are easily caused under the action of dynamic loads such as earthquakes and blasting,leading to the dam-break accidents,how to ensure the tailings security and stability have become an important research direction.Based on this research background,taking Gannan area of a tailings tailings sand as the object,and a series of physical and mechanical properties are tested,the GDS dynamic triaxial test system was used to study under different conditions of tail silty sand pore pressure growth law and post liquefaction deformation characteristics,the main conclusions are as follows:(1)The basic physical and mechanical properties of tailings sands were studied by particle size and permeability tests,and the particle size distribution curves and permeability characteristics of tailings sands were obtained.(2)The dynamic triaxial test of saturated tail silt was carried out using the GDS dynamic triaxial test system.Which focused on the development of dynamic pore water pressure under different confining pressure,relative density and consolidation ratio.with the analysis of test data,the hyperbolic model of the pore pressure and Seed model parameters are corrected,so as to better reflect the pore pressure growth characteristics of the tail silt.(3)After the liquefaction of the tail silt was added to the static load test,the deformation characteristics of the tail silt after liquefaction under different conditions were studied.Through analysis of the data during the static loading process,the hyperbolic model was considered to reflect the liquefaction of the tail silt.Deformation characteristics provide a theoretical basis for judging the flow range of tail silt after liquefaction...