Understanding the dynamic behavior of clayey soils is essential for engineering design, construction, and risk assessment to ensure the stability and safety of infrastructure built on or within these soils. To assess the impact of wheat straw on the dynamic properties of clayey soils proper testing and evaluation should be conducted before implementing it in engineering or construction projects. The objectives of the current study are to explore the impact of wheat straw on the dynamic properties of clayey soils; particularly the shear modulus and damping ratio. Prior research has mostly examined how wheat straw affects the physical, mechanical, biological, and index characteristics of soil; little attention has been paid to how wheat straw affects the dynamic features of clayey soils. In the present study, various percentages (0 to 10%) of wheat straw were blended with clayey soil and the testing was conducted on the Resonant Column Apparatus at the four confining pressures (90 kPa, 135 kPa, 180 kPa and 225 kPa). According to the experimental findings, the shear modulus and damping ratio gradually increase as the amount of wheat straw increases. Whereas, The shear modulus increases as the confining pressure increases, but the damping ratio decreases as a result. From the results, it may be concluded that the use of an optimal content of wheat straw increased the shear modulus and damping ratio which results in more resilience against earthquake damages.

Keywords: wheat straw, damping ratio, Shear modulus, resonant column