Abstract：The relationship，dynamic elastic modulus and dynamic strength was studied under different confining pressure and Phosphorus tailings by GDS dynamic triaxial test. The experimental results show that the dynamic strain-dynamic stress( )curves of the improved soil rise first and then decrease with the increase of phosphorus tailings，and the optimal dosage is 7%. The dynamic elastic modulus Ed decreases with the increase of the dynamic strain ，When ≤0.2%，the dynamic elastic modulus decreases rapidly. When ＞0.2%，the soil enters the plastic development stage，and Ed decreases and becomes slow. The dynamic strength curve conforms to the power function relationship；Dynamic strength increases with the increase of confining pressure，and increases first and then decreases with the increase of phosphorus tailings content. Compared with pure expansive soil，the modified soil dynamic strength increases by about 40 kPa，and the increase is about 30%. The improved soil dynamic cohesion cd increases first and then decreases with the increase of phosphorus tailings content；Compared with pure expansive soil，cd increases by about 9 kPa，and the increase is about 36%. The amount of phosphorus tailings has little effect on the internal friction angle φd. The dynamic strength calculation formula is given by nonlinearly fitting the relationship between dynamic strength parameters and phosphorus tailings.
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2020, Vol. 39 
