Improvement of complexity categories of civil engineering geological conditions

Introduction. When developing territories with certain engineering and geological specificity, a number of foundation construction issues remain unresolved. Such specificity is caused by the combination of different regional parameters of the territories under consideration, which necessitates the development of existing methods of calculation and design of foundations for multi-storey and high-rise buildings.

Materials and methods. The authors carried out the work on generalization of engineering-geological conditions of more than 100 construction sites in the south of Russia, which are characterized as complex according to the current regulations (CP 47.13330.2016). It was found that the existing classification of complexity of engineering-geological conditions of construction does not always reflect the real conditions of development of such areas and needs improvement.

Results. The category of complexity of engineering-geological conditions is proposed — especially complex. The category of especially complex is understood as a combination of three or more factors: high design seismicity of the construction site; irregular alternation of foundation layers with their significant heterogeneity in terms of soil properties in plan and depth; risk of landslide and gravitational processes development; significant difference of relief marks within the construction site; relief slopes in two directions.

Conclusions. Taking into account the proposed category of engineering-geological conditions, the classification of methods of calculation and design of foundations of multi-storey buildings in especially complex conditions of construction has been developed and their practical implementation is presented. The particularly complex category of engineering-geological conditions of construction can be considered as promising for introduction into the normative documents.

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