Análisis del empuje activo estático y dinámico, desarrollado por suelos cohesivos sobre el trasdós de un muro de contención cantilever, mediante la modelación numérica en 2D usando Midas GTS NX

Abstract

The present paper analyzed the static and dynamic soil pressure generated for a cohesive soil on the cantilever wall stem, with the comparison between 2D MIDAS GTS NX numerical model and the traditional analytical theories. In the numerical model, it was considered the Mohr-Coulomb constitutive model, using parameters such as cohesion, friction angle, elasticity modulus and unit weight obtained from shear strength tests, reflecting the importance of considering the influence of cohesion when calculating the soil pressure mentioned above in order not to generate overestimated values of the active soil pressure that do not differ from reality. According to the comparison made between the time-history dynamic analysis and the Mononobe-Okabe analytical calculation (not considering cohesion), it was obtained an overestimation up to twice the value of the active soil pressure when using a cohesion greater than 0.9 t/m2 in the analysis. It was performed an analytical calculation process of the static soil pressure and in earthquake condition, additionally it was obtained the soil pressure through numerical modeling, and it was found a simplified analytical expression that provides approximate values of the dynamic active soil pressure in a cohesive soil under certain considerations. To obtain this expression, it was performed a statistical analysis by using a multiple linear correlation considering independent variables until finding statistically significant parameters that meet a coefficient of determination (𝑅2) greater than 95 %.