Use of the static penetration test method to investigate the properties of frozen soils

Isaev, O. N.; Shvarev, V. V.; Tikhomirov, S. M.; Sadovskii, A. V.; Konstantinov, Alexander

doi:10.1007/bf02716914

Cited by 1 publication

(1 citation statement)

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“…However, the use of this geotechnical tool is not so well developed for the investigation of frozen ground and permafrost. Only limited experience of CPTU applied to cold regions geotechnical engineering practice is available in permafrost environment (Buteau et al 2005, Fortier et al 1993, 1994, 1996, and 2011, Isaev and Ryzhkov 2010, Isaev et al 1991, Ladanyi 1976, 1982, and 1985, Ladanyi and Huneault 1989, Ladanyi et al 1991, Woeller et al 1991, arctic offshore (Blouin et al 1979, Dallimore et al 1988, Dlugach et al 1995, and frozen ground (Campanella et al 1984). …”

Section: Introductionmentioning

confidence: 96%

Penetration Rate-Controlled Electrical Resistivity and Temperature Piezocone Penetration Tests in Warm Ice-Rich Permafrost in Northern Quebec, Canada

Fortier¹,

Wu²

2012

Cold Regions Engineering 2012

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Electrical resistivity and temperature piezocone penetration test (RTCPTU) was carried out in warm ice-rich permafrost formed in silty soil near Umiujaq, Northern Quebec, Canada, to study the cryostratigraphy of permafrost and adapt soil classification charts for the interpretation of RTCPTU in such environment. A linear pushing system based on an actuator technology was used to accurately control the penetration rate of the piezocone in permafrost.According to the interpretation of the RTCPTU logs, cryostratigraphic contacts and layers such as the thawing front, permafrost table and base, active layer, ice-rich permafrost and perennially noncryotic ground, layers of ice-poor frozen silt, and ice lenses were identified. Due to its reticulated cryostructure made of a sequence of centimetric thick ice lenses and frozen soil layers, ice-rich permafrost is characterized by extremely variable values of cone resistance and friction ratio corrected for pore pressure effects, pore pressure, and electrical resistivity between 5 and 50 MPa, 0.01 and 2%, near zero and 10 MPa, and 0.01 and 20 kΩ-m, respectively. Cone resistance up to 50 MPa, friction ratio down to 0.01%, pore pressure near 10 MPa, and electrical resistivity close to 10 kΩ-m are characteristics of thick ice lenses. The layers of ice-poor frozen silt with high unfrozen water content have cone resistance lower than 10 MPa, friction ratio in excess of 1%, pore pressure lower than 3 MPa, and electrical resistivity lower than 1 kΩ-m.Based on permafrost behaviour types as characterized from the RTCPTU logs, new zones are proposed in soil classification charts to identify frozen soils. These adapted soil classification charts are helpful to practitioners for the interpretation of RTCPTU carried out in permafrost.

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