Rubber-sand mixture

as a kind of low-cost and environmental protection geotechnical material

has broad applications

and the research on its mechanical properties is of great significance. In this study

the combined test of shear wave and compression wave for rubber-sand mixture is carried out by bender-extender element method. The propagation time of shear wave and compression wave is determined by discrete frequency scanning method and initial arrival wave method

respectively. After that

the elastic dynamic parameters such as initial shear modulus

constrained modulus and Poisson's ratio

are obtained. The influence of rubber content and confining pressure on elastic dynamic parameters of rubber-sand mixture is analyzed as well. The results show that under the same confining pressure

with the increase of rubber content

the initial shear modulus and constrained modulus of rubber-sand mixture gradually decrease

and the initial Poisson's ratio gradually increases. Under the same rubber content

with the increase of confining pressure

the initial shear modulus and constrained modulus of rubber-sand mixture gradually increase

and the initial Poisson's ratio gradually decreases. Finally

the coupling effect of the two factors and the related mechanical mechanism are analyzed.