Abstract: In order to study the dynamic mechanical behavior of the total tailing cemented backfilling under the mining disturbance impacted by cement-sand ratio， three groups of different cement-sand ratio specimens of total tailing cemented backfilling were precasted， and the precast specimens under uniaxial impulse by using the  50 mm SHPB experimental system was tested.The test results show that the total tailing cemented backfilling has strong reflection and damping effect on elastic wave propagation.At the high strain rate， specimens exhibit the behavior of rapid softening and the softening specimens reach to peak strength at around 18 μs.The dynamic compressive strength increases with an increase instrain rate. The higher cement-sand ratio， the greater the ultimate dynamic compressive strength. At the same strain rate， the dynamic compressive strength of the specimens decreases with the increase of cement content.At the same strain rate， the lower the cement content， the more severely the specimens fail with the form of crushing destruction.

Key words: milling disturbance, total tailing cemented backfilling, cement-sand ratio, SHPB test, high strain rate, dynamic mechanical properties