The form of the elastic core and areas of plastic flow base under the jucked stamp

Abstract

The article provides the information about studies devoted to determining the position, shape and size of the elastic soil core and areas of plastic deformations formed in the soil foundation under the jucked stamp. Based on the results analysis of experiments carried out by third-party researchers and the results of calculations performed by the authors of the article, it was concluded that an elastic soil core in the form of a triangle is formed in the case when the indentation of a stamp is carried out into a base folded with loose ground, provided that φ>25-30° (this depends on the value of the lateral soil pressure coefficient), and the specific cohesion C is quite small. In cohesive soils, the vertical section of the elastic soil core has a form close to that of half an ellipse, half or a segment of a circle. The exceptions are the results of the experiments by Kaganovskaya S E, where a triangular elastic core was obtained for clay soil. All these facts are in satisfactory agreement with Prandtl’s design scheme, and therefore, the use of calculation methods based on it is justified only for sandy bases. To solve the problem of calculating the bearing capacity of soil foundations composed of various types of soils, methods should be created that are not based on hypotheses about the shape of the elastic core and areas of plastic deformation.