Experimental Study On The Physical And Mechanical Properties And Stability Analysis Of Lingnan Tailings

Tailings dam failure caused many disasters,they bring not only the destruction of the surrounding ecological environment,but also bring great threat and loss of life and property of the reservoir downstream residents.Tailings soil is a newly stacked artificial soil,the formation of it after a certain handling,sorting and deposition,there are its many different with natural soil,with the growing complexity of tailings project,about tailings soil’s research has become increasingly important,the study of tailings soil physical and mechanical properties andt tailings dynamics properties are still relatively limited.While the stability of the tailings dam has always been the key to the success of the project of tailings,tailings urgent need to solve the stability problem of tailings dam.In this thesis,through soil tests and numerical simulation research the tailings dam of Lingnan Shangdong,through research and analysis to obtain the following conclusions:Through a lot of the basic physical and mechanical soil test,analysis of the tailings soil indicators,such as moisture content,dry density and the porosity.The basic physical and mechanical properties of tailings soils were studied by particle size analysis test,compression test,direct shear test and triaxial compression test.The particle composition,compressive characteristics and strength characteristics of tailings were obtained.The resulting data will be used as the basic subsequent analysis,is the theoretical analysis of the full text foundation.Based on the experiment of indoor physical mechanics,the dynamic liquefaction test of tail sand,tail silt and tail silt was carried out by DDS-70 microcomputer controlled electromagnetic vibration triaxial test system.Test and dynamic shear modulus and damping ratio.Through the analysis of the experimental data and the results,the relationship between the dynamic shear strength index and the dynamic shear modulus and damping ratio and the dynamic shear strain are obtained.Strength parameters and indicators,the test to get tail sand,tail powder sand and tail silt dynamic modulus is higher,and damping is relatively small,so the dynamic characteristics of better,not easy to produce power damage.Based on the previous physical mechanics test and the dynamic characteristic experiment,the basic physical parameters and dynamic parameters of the tailings are given.The numerical simulation is carried out by GEO stability analysis software,which is mainly carried out in normal operation,flood operation and earthquake and flood According to the stability analysis under the three conditions,it is concluded that the degree of local liquefaction of the tailings dam is relatively weak.Therefore,the liquefaction of the earthquake will not have a substantial impact on the tailings dam.As a result of the combined dynamic calculation,the power of the dam under this earthquake is stable.The data and results of these numerical analysis provide some basis for the design of the tailings dam project.