A distinctive feature of the geological structure of the regions of southern Kazakhstan are weak ground deposits with a thickness of up to 20 meters or more, water saturation of the surface layers of the base with groundwater or surface waters and high seismicity up to 10 points on the MSK-94 scale. Construction in such conditions requires a set of measures to strengthen the foundation and improve the mechanical properties of the foundation soils. Soil hardening is performed with DSM cement columns of a certain diameter and a step of arrangement along the reinforced array. Such hardening changes the seismic properties of the base and, accordingly, the joint operation of the structure with the base soils in comparison with the non-hardened base soil. The article presents data on the propagation velocities of transverse and longitudinal waves in natural and reinforced substrates. Data on the wave propagation velocities in the column material used to strengthen the base are presented. The data of geophysical studies on the measurement of wave propagation velocities in an unconstructed and hardened massif are presented. It is shown how, depending on the number of reinforcement elements and their arrangement patterns in the reinforced array, the propagation velocity of transverse and longitudinal waves can change. It is shown how and to what extent the rigidity of the hardened massif and the seismic properties of the soils of the hardened base change. The MIDAS GTS NX provides an example of using the DSM column reinforcement method and an approach to determining the dynamic properties of a reinforced base to calculate the bearing capacity and operational suitability of a building or structure under seismic influence.
Khomyakov et al. (Thu,) studied this question.