ABSTRACT
The natural climatic conditions of southern Kazakhstan are characterized by a geological structure, represented by deposits of macroporous and subsiding soils. Construction on these soils requires a set of measures to strengthen and improve mechanical properties. One of the hardening methods is deep mixing within the active compressible strata. However, the method is still limited in application. The main reason for the weak distribution of the method is the quality of the soil-cement column-column obtained by mixing and the effect of seismic action on its bearing capacity. It is the column that is the main element that increases the bearing capacity of the foundation soils. The article presents the results of a study of the physical and mechanical properties of columns obtained by deep mixing in subsidence loess soils in the south of Kazakhstan. The studies were carried out on samples taken from soil-cement columns from depths of 3 and 5 meters, in a natural and soaked state. The mechanical parameters were obtained by tests in uniaxial and triaxial compression devices. The dependences of the change in the mechanical parameters of the column material on the brand of cement, the degree of water saturation are obtained, and the properties of anisotropy are revealed. Based on the results of the research, calculations were made at the facilities of the city of Shymkent and recommendations were given on the use of reinforcing elements to increase the bearing capacity of weak foundations
