A DDS-70 dynamic triaxial apparatus is used to investigate the elastic modulus of reinforced soil. The influences of confining pressure
compactness and the reinforcing patterns on the elastic modulus are studied. The results show that the relationship of dynamic stress versus dynamic strain of reinforced soil tally with hyperbolic model. The curves of dynamic elastic modulus versus strain for reinforced soil are similar to that of pure soil. For reinforced soil sample the dynamic elastic modulus decreases with strain increasing; at the same dynamic stress level
the dynamic elastic modulus increases with the confining pressure and the initial dry density increasing and decreases with dynamic strain increasing; the relationship between modulus and strain is exponential decay. The maximum dynamic elastic modulus relates with reinforce material