Geotechnical monitoring of frozen earth foundation by cone penetration test
This paper introduces a new approach to the diagnostics of frozen earth foundation condition and some aspects of physical processes, which impacts on properties and condition of permafrost soils. The influence of temperature change in the range from 0 to -10 °C on the state of frozen soil is considered. The significance of the concentration of salts in the pore water in the frozen earth is shown. On the example of recent studies of specialists of the "Fugro Group" on various sites it is revealed that with the help of cone penetration testing it is possible to assess the state of frozen soils and take into account their properties for the design of bases and foundations of structures. The new classification of frozen earth base condition with relation to pile foundation based on the new approach to geotechnical monitoring is proposed that makes it possible to adopt a sound decision on engineering protection measures. The proposed approach makes it possible to diagnose permafrost weakening/degradation under monitored structures at early stages and timely take proper adequate actions on engineering protection measures.