The research paper reviews issues associated with the impact of groundwater flow on soil characteristics and parameters, hence, the entire structure of a building set on it.Water seepage through the ground, building subsoil or structural elements of buildings made of soil affects the soil skeleton and may lead to changes in the arrangement of individual grains relative to each other, i.e., a modified soil structure. Soil solid phase (soil skeleton) deformations resulting from seepage forces are called seepage-induced deformations. The article characterizes typical seepage-induced deformations and specifies a criterion defining the beginning of the phenomenon. The case study involved using data on cracks and deformations in a historic building, as well as water seepage in its subsoil. Seepage was analysed, and zones where the seepage process initiation criterion was exceeded, were determined based on subsoil water level monitoring data. The determined zones coincide with the location of building cracks and scratches and confirm the possible cause behind building damage.

The paper presents the original concept of description and analysis of buildings (wall and floor structures), corresponding to the natural components of construction, quasi finite elements (QWSFS). This concept constitutes one of the component of the developed, interactive model of deep foundation buildings. The presented modelling method enables a significant reduction of the number of unknowns, which in the case of interaction building – subsoil, gives a possibility of including the factual geometry and building development stiffness into the FEM model. Therefore the true representation of static operation of the objects can be analysed. The paper gives basic assumptions to the construction of the QWSF-superelements as well as the results of numerical tests conducted. The potential of using the developed modelling concept in the analysis of the structural elements and deep foundation problems, in a three-dimensional system: subsoil – new building – potential neighbouring building development (at each stage of erection of investment, using a structural statics stage analysis) was presented.