SPECIFIC FEATURES OF THE CONSTRUCTION AND QUALITY CONTROL OF PILE FOUNDATIONS IN ENGINEERING AND GEOLOGICAL CONDITIONS OF SAINT PETERSBURG

Abstract

Introduction: The article reviews various methods of the construction and quality control of pile foundations in complex geological conditions of Saint Petersburg. The authors describe conditions, under which the geological structure of the city was formed. They list the main factors affecting the selection of foundation types and methods of their construction, describe soil properties influencing the quality of piles. Methods: Methods of pile construction based on different drilling technologies are presented (bored piles, pre-fabricated piles, displacement piles (with soil compaction and extraction)). Various methods of the quality control of piles constructed are also described (seismoacoustic, ultrasonic). Conclusions: Based on the results of the study, it is concluded that pile quality control methods shall be widely used and their applicability shall be extended. Discussion: It is suggested to improve methods of pile foundation integrity testing, increase their use on construction sites, study their applicability not only to detect defects in a pile but to control the quality of construction and materials used.

Keywords

• geology
• foundations
• pile technologies
• control methods.