A method for correcting the temperature effect on uCPT measurements in seabed sediments |
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| Authors: | Rui Jia Jinchun Chai |
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| Institution: | 1. Dr. Eng., School of Civil Engineering, Tianjin University, Jinnan, Tianjin, China;2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin, China;3. Dr. Eng., Department of Civil Engineering and Architecture, Saga University, Saga, Japan |
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| Abstract: | AbstractThe zero load readings of cone resistance (qc) and sleeve friction (fs) measured by a piezocone (uCPT) shift with the ambient temperature. A method of correcting the effect of temperature on uCPT measurements in seabed sediments has been proposed for the case where there is no temperature sensor in the uCPT probe. This method is based on the assumption that the “actual” profile of fs of soft shallow seabed sediments linearly increases with depth, and a rate of increase of α?=?0.2?kPa/m was obtained using measured ground temperatures and fs values in seabed sediments in Isahaya Bay, Japan. An “actual” fs profile can then be constructed using the measured fs value at the shallow surface and the value of α. Using the differences between the measured and the estimated “actual” fs profiles, the ground temperature profile can be obtained, and then the effect of temperature on the uCPT measurements can be corrected. The proposed method was used for temperature corrections on uCPT measurements in Isahaya Bay, Japan. The values of undrained shear strength (su) from the temperature-corrected uCPT measurements agree well with the laboratory measured values of su using the undisturbed soil samples. |
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| Keywords: | Ground temperature negative value seabed sediments temperature correction temperature effect uCPT measurements |
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