Reviewed by Doctor of Technical Sciences, Professor P. V. MonastyrevKeywords: breaking load; cyclic loading; deformation; reinforcement; slope. Abstract:The results of experimental studies of reinforced sandy slope stability under the action of vertical surcharge are presented in the article. There have been made a few series of experiments in which the depth of the reinforcing element, as well as the parameters of reloading -cyclical (5, 10 and 20 load cycles) and static one -were varied. The case of the presence of the weak soil interlayer situated at different depths within the slope is discussed.The dependences of the influencing parameters on the displacements and limit pressures under the pilot stamp foundationbed have been obtained. It is shown that fabric-reinforced slope can bear vertical load almost two times greater than a non-reinforced one, with smaller deformations. Absolute values of the breaking load after cycling are greater than those at static loads. It is found that the use of reinforcement eliminates the possibility of the landslide collapse of the slope and the location of the weak soil interlayer at a depth greater than the diameter of the model has almost no effect on the slope bearing capacity and makes the reinforcement in this area ineffective.Slopes are the most common engineering structures. Their operating conditions tend to be unfavorable and unpredictable. Possible geological processes and phenomena on territories with slopes, causes and patterns Антонов Василий Михайлович -кандидат технических наук, доцент кафедры «Кон-струкции зданий и сооружений»; e-mail: kzis@nnn.tstu.ru; Антонов Михаил Васильевич -аспирант кафедры «Конструкции зданий и сооружений»; Евдокимцев Олег Владимирович -кандидат технических наук, доцент кафедры «Конструкции зданий и сооружений»; Леденев Виктор Васильевич -доктор технических наук, профессор кафедры «Конструкции зданий и сооружений», ТамбГТУ, г. Тамбов, Россия.

Work is devoted to model and process the results of interaction between a rigid metal plate and a reinforced sand base using the software “ANSYS”. One of the effective ways to increase the strength is the inclusion of various materials (reinforcement) in the soil below the structure. It increases the resistance of the soil to stress and shear, limits lateral deformation. Organic, synthetic, metal and stone materials are used as reinforcing elements. The studies showed that the effectiveness of the reinforcement and the bearing capacity of the reinforced ground depend on the position, length, roughness and fixity condition of the reinforcement [27].

The results of plate tests conducted in the laboratory of “soil Mechanics” of TSTU are presented. The cases of application of static and cyclic loads on reinforced and unreinforced sand base are considered. In these tests, the density of the sand base, the depth of the reinforcement element, and the initial load stage from which cycling was performed were changed. Three series of experiments were performed in a tank with rigid side walls. As the base, a fine, low-moisture, homogeneous sand was used. In the first series of experiments a stepwise increasing load was transferred to the plate at different densities. In the second series, a cyclic load was transferred to the base, with a value equal to half of the previously found ultimate load. In the third series of experiments, a reinforcing element was placed in the base at various distances from the sole of the foundation model and the load was applied both stepwise increasing static and cyclic. It is shown that the settlement during introduction of cyclic loading is from 20 to 50% of the total value. Reinforcement of the base allows you to reduce the settlement of cycling load. At the same time, there is a significant increase in the bearing capacity of the foundation and a decrease in the values of total deformations.

The article presents a comparison of the values of the soil deformability characteristics obtained at different densities of the sand base based on the results of laboratory tests3 and the results of computer modeling, using the software systems "ANSYS" and "Plaxis 3D".It was found that for loose sandy soils, at densities of 1.48 – 1.53 g/cm 3, close to experimental values of the deformation modulus were obtained using a three-dimensional finite-element model of polylinear isotropic hardening "PLAS (Miso)," in the program "ANSYS." For average density bases at ρ = 1.55 – 1.66 g/cm3 minimum differences between experimental and numerical values were obtained using the «Plaxis 3D» complex.

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