橡胶砂减压层对膨胀土挡墙土压力的调控作用研究OA

Installing a rubber-sand mixture cushion layer between expansive soil and a concrete retaining wall can effectively mitigate the increase in lateral earth pressure induced by the swelling of expansive soil upon wetting.However,the influence of such a cushion layer on the magnitude and distribution of earth pressure behind the wall has not been systematically investigated.In this study,model tests on expansive soil retaining walls with rubber-sand mixture cushion layers were conducted to examine the distribution of earth pressure along the wall height.Then a theoretical calculation method for lateral earth pressure was developed based on the horizontal differential element method.The results indicate that the rubber-sand mixture cushion layer undergoes lateral compression under the action of swelling pressure,providing deformation space for the expansive soil and thereby significantly reducing the earth pressure acting on the wall.When the backfill reaches full saturation,the lateral earth pressure gradually increases with depth.The theoretical predictions show good agreement with the experimental measurements,verifying the validity of the proposed calculation method.