To　investigate　the　dynamic　deformation　and　strength　of　fused　silica　sand　in　the　process　of　liquefaction　under　vibration　load,　and　promote　the　application　of　transparent　soil　technology　in　the　dynamic　characteristics　visualization　model　test　of　geotechnical　engineering,　the　dynamic　triaxial　tests　on　the　saturated　fused　silica　sand　specimens　with　typical　sizes　(0.5-1.0　mm)　forming　the　skeleton　structure　of　transparent　sand　were　carried　out.　The　cumulative　axial　strain,　development　mode　of　dynamic　pore　pressure,　attenuation　of　dynamic　stress,　and　change　rules　of　dynamic　elastic　modulus　and　damping　ratio　of　fused　silica　sand　specimens　under　the　working　conditions　of　different　confining　pressures,　loading　frequencies　and　dynamic　stress　ratios　were　studied,　and　the　test　results　were　compared　with　those　of　standard　sand　with　the　same　gradation.　Analysis　result　shows　that　the　cumulative　axial　strain　of　fused　silica　sand　changes　from　a　stable　type　to　a　destructive　type　with　the　increase　of　dynamic　stress　ratio.　The　critical　dynamic　stress　ratio　is　0.150-0.175　as　the　loading　frequency　ranges　from　0.5　Hz　to　1.5　Hz,　which　is　less　than　that　of　standard　sand　of　0.200-0.225.　Increasing　the　confining　pressure　and　dynamic　stress　ratio　and　decreasing　the　loading　frequency　will　accelerate　the　accumulation　of　plastic　strain　of　specimen　and　shorten　the　liquefaction　failure　time.　With　the　increase　of　confining　pressure,　the　development　mode　of　pore　pressure　gradually　changes　from　the　Seed　model　to　the　exponential　model.　Increasing　the　dynamic　stress　will　increase　the　vibration　amplitude　of　pore　pressure　after　the　liquefaction　failure.　Under　the　same　dynamic　stress　ratio,　the　dynamic　stress　changes　of　fused　silica　sand　and　standard　sand　are　linearly　correlated　with　the　dynamic　strain.　When　the　confining　pressure　is　greater　than　200　kPa,　the　dynamic　stress　attenuation　amplitude　decreases　with　the　increase　of　confining　pressure.　The　relationship　between　dynamic　elastic　modulus　and　damping　ratio　is　linear.　The　dynamic　elastic　modulus　decreases　hyperbolically　with　the　increase　of　dynamic　strain　and　increases　as　the　confining　pressure　increases.　The　damping　ratio　increases　first　with　the　increase　of　dynamic　strain　and　then　basically　stabilizes　at　0.22,　and　its　development　curve　is　less　affected　by　the　confining　pressure.　©　2020,　Editorial　Department　of　Journal　of　Traffic　and　Transportation　Engineering.　All　right　reserved.