ABSTRACT
The present study was carried out in order to improve the prediction of the stress-strain state of the soil foundations under dynamic influence based on the assessment of the liquefaction potential. The influence of the distribution of the potential of soil liquefaction over the depth of the soil mass is investigated, a hypothesis is put forward about the need to consider the potential of liquefaction with mandatory reference to the depth of the soil and the inadmissibility of using the concept of “average” liquefaction potential for the entire layer, regardless of its capacity, which leads to an unreasonably optimistic assessment of the stability of the soil mass. The tests were carried out for an engineering survey site composed mainly of sandy soils, shallow and dusty, loose and medium density, water-saturated, prone to dynamic instability. The predicted seismic impacts are taken on the basis of direct measurements made at the site of engineering surveys. The research was carried out on the basis of special laboratory studies of soils under conditions of dynamic triaxial compression. Samples of fully water-saturated soil were tested to determine shear stresses at the time of dynamic liquefaction. Then the liquefaction potentials were calculated in the first case on average for the entire soil layer, in the second case taking into account the distribution over the depth of the layer. As a result of the studies performed, the initial hypothesis was confirmed. For the studied sandy soils, the use of the “average” value of the liquefaction potential is not correct, since part of the studied soil is characterized as dynamically stable, while the other part is prone to liquefaction. If only the average value of the liquefaction potential is calculated, a false statement of the stability of the entire layer will be obtained. The conducted research complements and expands the current understanding of the assessment of the dynamic stability of soils under seismic influences and can be used to predict the stress-strain state of buildings and structures in complex engineering and geological conditions.
