Abstract:In order to study the changes of mechanical properties of cement-modified red sandstone soil subjected to dry-wet cycle, the red sandstone soil specimens with different cement dosages were not modified and subjected to dry-wet cycle, and then the indoor triaxial test was carried out to study the wet and dry After the cycle, the stress-strain curve, the failure surface form, the peak strength and the elastic modulus of the soil are changed, and the multivariate relationship between the peak strength and the elastic modulus is calculated by software. The results show that cement as a modifier does not change the stress-strain curve shape of red sandstone soil, but at each stage of the curve, the stress characteristics of cement on red sandstone soil are improved. The damage form of red sandstone soil by cement is The plastic failure changes to brittle failure; the peak strength and elastic modulus of the red sandstone soil are significantly improved by incorporating different doses of cement. With the increase of the number of dry and wet cycles, the elastic modulus and peak strength of the cement-modified specimens first decreased and then increased. The exponential function relationship was used to perform multivariate nonlinear fitting on the elastic modulus and peak strength to establish elasticity. Modulus and peak strength The relationship between the number of dry and wet cycles, confining pressure and cement dosage is ideal.