加筋废弃钢渣混合土循环剪切性能OA

[Objective]To improve the engineering properties of clay and increase the utilization of waste steel slag(SS),[Methods]geogrid reinforcement was employed,followed by direct shear tests,cyclic shear tests,and post-cyclic direct shear tests conducted on steel slag-clay mix,sand-clay mix,and pure clay.The study investigated the strength characteristics,damping ratio,shear stiffness changes,and displacement of the mixed soil reinforcement-soil interface under various conditions,including different steel slag contents,vertical stress,moisture content,and shear amplitudes.[Results]The test results indicate that steel slag significantly enhances the shear strength of the clay-reinforcement interface,with improvement being more effective than conventional sand-modified clay.The steel slag-clay mixed soil exhibited higher damping ratio and shear stiffness,suggesting better vibration damping and energy dissipation properties.Among the various mixtures,the steel slag-clay mix with 40%steel slag content demonstrated the best shear strength,damping ratio,and shear stiffness.Additionally,the shear strength of the steel slag-clay mixed soil increased after cyclic loading compared to pre-cyclic direct shear conditions.The results also show that moisture content has a more significant impact on shear strength,shear stiffness,and damping ratio than vertical stress and shear amplitude.[Conclusion]The steel slag-clay mixed soil exhibits improved damping and energy dissipation properties under cyclic shear loading.The experimental findings provide a theoretical basis for using steel slag as a substitute for sand to improve clay soils.