Cone penetration-induced pore pressure distribution and dissipation |
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| Institution: | 1. Graduate School of Science and Engineering, Saga University, 1 Honjo, Saga 840-8502, Japan;2. Faculty of Engineering and Built Environment, the University of Newcastle, NSW 2308, Australia;3. Department of Civil Engineering, Shanghai Jiao Tong University and State Key Laboratory of Ocean Engineering, 800 Dong Chuan Road, Minhang District, Shanghai 200240, China;1. Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy;2. IMT Institute for Advanced Studies Lucca, Piazza San Francesco 19, 55100 Lucca, Italy;1. Department of Petroleum and Natural Gas Engineering, West Virginia University, Morgantown, WV 26506, USA;2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;1. Smislova, Kehnemui & Associates, PA, 12505 Park Potomac Ave., Suite 200, Potomac, MD 20854, United States;2. Department of Civil Engineering, Texas A&M University, 500 CE/TTI Bldg., 3136 TAMU, College Station, TX 77845, United States;3. Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, 301 E. Dean Keeton St., Stop C1747, Austin, TX 78712, United States;1. E.L. Robinson Engineering, 1801 Watermark Drive, Suite 310, Columbus, OH 43215, United States;2. Department of Civil Engineering, The University of Akron, 244 Sumner Street, ASEC 210, Akron, OH 44325, United States;1. Department of Civil, Chemical, Environmental and Materials Engineering, DICAM, Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy |
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| Abstract: | The excess pore water pressure distribution (u) induced by the penetration of a piezocone into clay and its dissipation behaviour have been investigated by laboratory model tests, theoretical analysis and numerical simulation. Based on the results of the tests and the analysis, a semi-theoretical method has been proposed to predict the piezocone penetration-induced pore pressure distribution in the radial direction from the shoulder of the cone. The method can consider the effect of the undrained shear strength (su), over-consolidation ratio (OCR) and rigidity index (Ir) of the soil. With a reliably predicted initial distribution of u and the measured curve of dissipation of pore water pressure at the shoulder of the cone (u2), the coefficient of consolidation of the soil in the horizontal direction (ch) can be back-fitted by analysis of the pore pressure dissipation. Comparing the back-fitted values of ch with the values directly estimated by a previously proposed method indicates that the previously proposed method can be used reliably to estimate ch values from non-standard dissipation curves (where u2 increases initially and then dissipates with time). |
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| Keywords: | Piezocone test Model test Coefficient of consolidation Excess pore pressure Cavity expansion |
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