Analysis on the Influence Factors of Frozen Soil to Drillability in Geotechnical Engineering Investigation

Abstract:

The silty clay with water content of 13%~27% is frozen at 0 ~-25℃to measures the uniaxial compressive, tensile, shear strength and wave velocity of frozen soil. The test results show that when the silty clay water content is 18%~25% and the temperature of frozen soil is 0~-18℃, along with the increase of moisture content, the compressive, tensile and shear strength of frozen soil decrease under a certain temperature and drillability shows decreasing trend; at certain water content, along with the decrease of temperature, the compressive, tensile and shear strength of frozen soil increase and the drillability grade is improved. For the investigation in winter, the drilling speed can be improved by adding hot water in drilling hole to reduce the influence of frozen soil.

Key words:frozen soil; temperature; compressive strength; tensile strength; drillability; geotechnical engineering investigation