Abstract
The undrained shear strength of clay is important for deep-sea foundation design. T-bar penetrometer as a key tool has been widely used in laboratory and offshore site investigation. To obtain a continuous soil strength profile, it is necessary to apply shallow corrections before the penetrometer reaching the full-flow state. Meanwhile, the actual soil strength may be underestimated if the strain softening behavior is not considered. In this study, the process of T-bar penetration is analyzed for the soil with strain softening. The buoyancy effect on the bearing capacity factor is studied, which shown that the buoyancy mainly has an effect on the test soils with extremely low strength, but have little effect in the field tests. The characteristics of soil heave in the T-bar tests are analyzed to estimate soil sensitivities. To estimate the soil strength at shallow penetration depth, a relation to correct the T-bar bearing factors is built both on the soil with strain softening and no strain softening.
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References
Aubeny C, Shi H, Murff J (2005) Collapse loads for a cylinder embedded in trench in cohesive soil. International Journal of Geomechanics 5(4):320–325, DOI: https://doi.org/10.1061/(ASCE)1532-3641(2005)5:4(320)
Bernander S (2011) Progressive landslides in long natural slopes: Formation, potential extension and configuration of finished slides in strain-softening soils. PhD Thesis, Luleå Tekniska Universitet, Porsön, Luleå
Chatterjee S, Randolph M, White D (2012) The effects of penetration rate and strain softening on the vertical penetration resistance of seabed pipelines. Geotechnique 62(7):573–582, DOI: https://doi.org/10.1680/geot.10.P.075
Chini CM, Wallace JF, Rutherford CJ, Peschel JM (2015) Shearing failure visualization via particle tracking in soft clay using a transparent soil. Geotechnical Testing Journal 38(5):708–724, DOI: https://doi.org/10.1520/GTJ20140210
Chung SF, Randolph MF, Schneider JA (2006) Effect of penetration rate on penetrometer resistance in clay. Journal of Geotechnical and Geoenvironmental Engineering 132(9):1188–1196, DOI: https://doi.org/10.1061/(ASCE)1090-0241(2006)132:9(1188)
Dejong J, Yafrate N, Degroot D, Low HE, Randolph M (2010) Recommended practice for full-flow penetrometer testing and analysis. Geotechnical Testing Journal 33(2):137–149, DOI: https://doi.org/10.1520/GTJ102468
Dey R, Hawlader B, Phillips R, Soga K (2015) Large deformation finite-element modeling of progressive failure leading to spread in sensitive clay slopes. Geotechnique 65(8):657–668, DOI: https://doi.org/10.1680/geot.14.P.193
Dey R, Hawlader B, Phillips R, Soga K (2016) Numerical modelling of submarine landslides with sensitive clay layers. Geotechnique 66(6): 454–468, DOI: https://doi.org/10.1680/jgeot.15.P.111
Dutta S, Hawlader B, Phillips R (2014) Finite element modeling of partially embedded pipelines in clay seabed using coupled eulerian-lagrangian method. Canadian Geotechnical Journal 52(1):58–72, DOI: https://doi.org/10.1139/cgj-2014-0045
Dutta S, Hawlader B, Phillips R (2018) Numerical modelling of a steel catenary riser section in the touchdown zone under cyclic loading. Ocean Engineering 164:168–180, DOI: https://doi.org/10.1016/j.oceaneng.2018.06.040
Einav I, Randolph MF (2005) Combining upper bound and strain path methods for evaluating penetration resistance. International Journal for Numerical Methods in Engineering 63(14):1991–2016, DOI: https://doi.org/10.1002/nme.1350
Gaudin C, White D (2009) New centrifuge modelling techniques for investigating seabed pipeline behaviour. Proceedings of the 17th international conference on soil mechanics and geotechnical engineering, October 5–9, Alexandria, Egypt
Ghorai B, Chatterjee S (2017) Influences of strain rate and soil remoulding on initial break-out resistance of deepwater on-bottom pipelines. Computers and Geotechnics 91:82–92, DOI: https://doi.org/10.1016/j.compgeo.2017.07.006
Gylland AS, Jostad HP, Nordal S (2014) Experimental study of strain localization in sensitive clays. Acta Geotechnica 9(2):227–240, DOI: https://doi.org/10.1007/s11440-013-0217-8
Hossain MS, Cassidy MJ, Hu Y (2016) T-bar to spudcan design approach in single-layer clays and calcareous silts. Journal of Geotechnical and Geoenvironmental Engineering 142(7):04016025, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0001486
Hossain MS, Zheng J, Menzies D, Meyer L, Randolph MF (2014) Spudcan penetration analysis for case histories in clay. Journal of Geotechnical and Geoenvironmental Engineering 140(7):04014034, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0001133
Hu P, Wang D, Cassidy MJ, Stanier SA (2014) Predicting the resistance profile of a spudcan penetrating sand overlying clay. Canadian Geotechnical Journal 51(10):1151–1164, DOI: https://doi.org/10.1139/cgj-2013-0374
Kim Y, Hossain M, Lee J (2017) Dynamic installation of a torpedo anchor in two-layered clays. Canadian Geotechnical Journal 55(3): 446–454, DOI: https://doi.org/10.1139/cgj-2016-0607
Kong D, Marti CM, Byrne B (2017) Sequential limit analysis of pipe-soil interaction during large-amplitude cyclic lateral displacements. Geotechnique 68(1):64–75, DOI: https://doi.org/10.1680/jgeot.16.P.256
Kurz D, Sharma J, Alfaro M, Graham J (2016) Semi-empirical elastic-thermoviscoplastic model for clay. Canadian Geotechnical Journal 53(10):1583–1599, DOI: https://doi.org/10.1139/cgj-2015-0598
Low HE, Randolph MF, Rutherford C, Bernard BB, Brooks JM (2008) Characterization of near seabed surface sediment. Offshore technology conference, May 5–8, Houston, TX, USA
Lu Q, Randolph M, Hu Y, Bugarski I (2004) A numerical study of cone penetration in clay. Geotechnique 54(4):257–267, DOI: https://doi.org/10.1680/geot.54.4.257.36358
Maitra S, Chatterjee S, Choudhury D (2016) Generalized framework to predict undrained uplift capacity of buried offshore pipelines. Canadian Geotechnical Journal 53(11):1841–1852, DOI: https://doi.org/10.1139/cgj-2016-0153
Martin C, Randolph M (2006) Upper-bound analysis of lateral pile capacity in cohesive soil. Geotechnique 56(2):141–145, DOI: https://doi.org/10.1680/geot.2006.56.2.141
Merifield R, White D, Randolph M (2009) Effect of surface heave on response of partially embedded pipelines on clay. Journal of Geotechnical and Geoenvironmental Engineering 135(6):819–829, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0000070
Nanda S, Sivakumar V, Hoyer P, Bradshaw A, Gavin K, Gerkus H, Jalilvand S, Gilbert R, Doherty P, Fanning J (2017) Effects of strain rates on the undrained shear strength of kaolin. Geotechnical Testing Journal 40(6):951–962, DOI: https://doi.org/10.1520/GTJ20160101
Nian T, Fan N, Jiao H, Jia Y (2018) Full-flow strength tests on soft clay in northern slope of South China Sea. Chinese Journal of Geotechnical Engineering 40(4):602–611
Pinkert S, Klar A (2015) Enhanced strain-softening model from cyclic full-flow penetration tests. Journal of Geotechnical and Geoenvironmental Engineering 142(3):04015087, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0001419
Puech A, Orozco-Calderon M, Foray P (2010) Mini T-bar testing at shallow penetration. In: Frontiers in offshore geotechnics II. CRC Press, London, UK, 305–310
Randolph MF, Andersen KH (2006) Numerical analysis of T-bar penetration in soft clay. International Journal of Geomechanics 6(6):411–420, DOI: https://doi.org/10.1061/(ASCE)1532-3641(2006)6:6(411)
Randolph MF, Houlsby G (1984) The limiting pressure on a circular pile loaded laterally in cohesive soil. Geotechnique 34(4):613–623, DOI: https://doi.org/10.1680/geot.1984.34.4.613
Ren Y, Yang Q, Wang Y, Zhao W (2019) Experimental study on the undrained shear strength of deep-sea soft soil using improved T-bar penetrometer. Marine Georesources & Geotechnology 38(10):1199–1208, DOI: https://doi.org/10.1080/1064119X.2019.1657532
Sahdi F, Gaudin C, White DJ, Boylan N (2014) Interpreting T-bar tests in ultra-soft clay. International Journal of Physical Modelling in Geotechnics 14(1):13–19, DOI: https://doi.org/10.1680/ijpmg.13.00012
Schlue BF, Moerz T, Kreiter S (2010) Influence of shear rate on undrained vane shear strength of organic harbor mud. Journal of Geotechnical and Geoenvironmental Engineering 136(10):1437–1447, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0000356
Sespeñe SM, Choo YW (2019) Empirical factors for miniature cone and T-bar penetrometers for kaolin clay. KSCE Journal of Civil Engineering 23(11):4675–4686, DOI: https://doi.org/10.1007/s12205-019-0885-5
Stewart D (1991) A new site investigation tool for the centrifuge. Proceedings of 1991 international conference on centrifuge, June 13–14, Boulder, CO, USA
Taukoor V, Rutherford C (2016) Displacement rate effects during T-bar cycling in remoulded Gulf of Mexico clay. Geotechnique 67(6): 553–557, DOI: https://doi.org/10.1680/jgeot.16.P.078
Tho KK, Leung CF, Chow YK, Palmer AC (2012) Deep cavity flow mechanism of pipe penetration in clay. Canadian Geotechnical Journal 49(1):59–69, DOI: https://doi.org/10.1139/T11-088
Wang YH, Siu WK (2006) Structure characteristics and mechanical properties of kaolinite soils. II. Effects of structure on mechanical properties. Canadian Geotechnical Journal 43(6):601–617, DOI: https://doi.org/10.1139/t06-027
Wang D, White DJ, Randolph MF (2010) Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement. Canadian Geotechnical Journal 47(8):842–856, DOI: https://doi.org/10.1139/T09-147
Westgate Z, White D, Randolph M (2013) Modelling the embedment process during offshore pipe-laying on fine-grained soils. Canadian Geotechnical Journal 50(1):15–27, DOI: https://doi.org/10.1139/cgj-2012-0185
White D, Gaudin C, Boylan N, Zhou H (2010) Interpretation of T-bar penetrometer tests at shallow embedment and in very soft soils. Canadian Geotechnical Journal 47(2):218–229, DOI: https://doi.org/10.1139/T09-096
Yu L, Zhang H, Li J, Wang X (2019) Finite element analysis and parametric study of spudcan footing geometries penetrating clay near existing footprints. Journal of Marine Science and Engineering 7(6):175, DOI: https://doi.org/10.3390/jmse7060175
Zhang W, Wang D, Randolph MF, Puzrin AM (2015) Catastrophic failure in planar landslides with a fully softened weak zone. Geotechnique 65(9):755–769, DOI: https://doi.org/10.1680/geot14.P.218
Zhao J, Jang BS, Duan M, Song L (2016) Simplified numerical prediction of the penetration resistance profile of spudcan foundation on sediments with interbedded medium-loose sand layer. Applied Ocean Research 55:89–101, DOI: https://doi.org/10.1016/j.apor.2015.11.010
Zheng J, Hossain MS, Wang D (2016) Prediction of spudcan penetration resistance profile in stiff-over-soft clays. Canadian Geotechnical Journal 53(12):1978–1990, DOI: https://doi.org/10.1139/cgj-2015-0339
Zhou H, Randolph MF (2007) Computational techniques and shear band development for cylindrical and spherical penetrometers in strain-softening clay. International Journal of Geomechanics 7(4): 287–295, DOI: https://doi.org/10.1061/(ASCE)1532-3641(2007)7:4(287)
Zhou H, Randolph MF (2009a) Numerical investigations into cycling of full-flow penetrometers in soft clay. Geotechnique 59(10):801–812, DOI: https://doi.org/10.1680/geot.7.00200
Zhou H, Randolph MF (2009b) Resistance of full flow penetrometers in rate dependent and strain-softening clay. Geotechnique 59(2):79–86, DOI: https://doi.org/10.1016/j.oceaneng.2015.08.033
Zhu H, Randolph MF (2011) Numerical analysis of a cylinder moving through rate-dependent undrained soil. Ocean Engineering 38(7): 943–953, DOI: https://doi.org/10.1016/j.oceaneng.2010.08.005
Acknowledgments
The research was supported by the financial support from the National Natural Science Foundation of China (Grant nos. 51679038 and 51890912).
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Han, Y., Yu, L. & Yang, Q. The Strength Assessment for T-bar Penetrometer Tests at Shallow Embedment in Clay considering Strain Softening. KSCE J Civ Eng 25, 2369–2380 (2021). https://doi.org/10.1007/s12205-021-0123-9
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DOI: https://doi.org/10.1007/s12205-021-0123-9