Geomechanics and Engineering

  • 제30권6호
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  • Pages.539-549
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Centrifuge modeling of dynamically penetrating anchors in sand and clay

  • An, Xiaoyu (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University) ;
  • Wang, Fei (National Engineering Laboratory for Port Hydraulic Construction Technology, Tianjin Research Institute for Water Transport Engineering) ;
  • Liang, Chao (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University) ;
  • Liu, Run (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University)
  • 투고 : 2022.06.24
  • 심사 : 2022.08.30
  • 발행 : 2022.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

Accidental anchor drop can cause disturbances to seabed materials and pose significant threats to the safety and serviceability of submarine structures such as pipelines. In this study, a series of anchor drop tests was carried out to investigate the penetration mechanism of a Hall anchor in sand and clay. A special anchor drop apparatus was designed to model the inflight drop of a Hall anchor. Results indicate that Coriolis acceleration was the primary cause of large horizontal offsets in sand, and earth gravity had negligible impact on the lateral movement of dropped anchors. The indued final horizontal offset was shown to increase with the elevated drop height of an anchor, and the existence of water can slow down the landing velocity of an anchor. It is also observed that water conditions had a significant effect on the influence zone caused by anchors. The vertical influence depth was over 5 m, and the influence radius was more than 3 m if the anchor had a drop height of 25 m in dry sand. In comparison, the vertical influence depth and radius reduced to less than 3 m and 2 m, respectively, when the anchor was released from 10 m height and fell into the seabed with a water depth of 15 m. It is also found that the dynamically penetrating anchors could significantly influence the earth pressure in clay. There is a non-linear increase in the measured penetration depth with kinematic energy, and the resulted maximum earth pressure increased dramatically with an increase in kinematic energy. Results from centrifuge model tests in this study provide useful insights into the penetration mechanism of a dropped anchor, which provides valuable data for design and planning of future submarine structures.

키워드

과제정보

The authors would like to acknowledge the financial support provided by the Fundamental Research Funds (Nos. TKS20200309 and TKS190203) for the Central Public Welfare Research Institutes and grant 51809132 of NSFC of China.

참고문헌

  1. Abdollahi, M. and Bazaz, J.B. (2017), "Reconstitution of sand specimens using a rainer system", Int. J. Eng., 37(3), 1451-1463. https://doi.org/10.5829/ije.2017.30.10a.05.
  2. Bolton, M.D. and Powrie, W. (1987), "The collapse of diaphragm walls retaining clay", Geotechnique, 37(3), 335-353. https://doi.org/10.1680/geot.1987.37.3.335.
  3. Chikatamarla, R., Laue, J. and Springman, S.M. (2006), "Centrifuge scaling laws for guided free fall events including rockfalls", Int. J. Phys. Model. Geotech., 6(2), 15-26. http://doi.org/10.1016/S09333630(96)00135-3.
  4. Cho, H.I., Sun, C.G., Kim, J.H. and Kim, D.S. (2018), "OCR evaluation of cohesionless soil in centrifuge model using shear wave velocity", Geomech. Eng., 15(4), 987-995. https://doi.org/10.12989/gae.2018.15.4.987.
  5. Craig, W.H., James, R.G. and Schofield, A.N. (1988), Centrifuges in Soil Mechanics, Crc Press.
  6. Fang, J.C., Kong, G.Q. and Yang, Q. (2022), "Group performance of energy piles under cyclic and variable thermal loading", J. Geotech. Geoenviron. Eng., 148(8), 04022060. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002840.
  7. Fretti, C., Presti, D.C.F.L. and Pedroni, S. (1995), "A pluvial deposition method to reconstitute well-graded sand specimens", Geotech. Test. J., 18(2), 292-298. https://doi.org/10.1520/GTJ10330J.
  8. Gao. Q., Duan M.L., Liu, X.H., Wang, Y., Jia, X., An, C. and Zhang, T. (2018), "Damage assessment for submarine photoelectric composite cable under anchor impact-science direct", Appl. Ocean Res., 73, 42-58. https://doi.org/10.1016/j.apor.2018.01.006.
  9. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and Standardization Administration of the People's Republic of China (2016), Hall Anchor, (GB/T546-2016), Beijing, China. (in Chinese)
  10. Han, C.C., Chen, X.J. and Liu, J. (2019), "Physical and numerical modeling of dynamic penetration of ship anchor in clay", J. Waterw. Port Coast. Ocean Eng., 145(1), 04018030. https://doi.org/10.1061/(ASCE)WW.1943-5460.0000490.
  11. Hariprasad, C., Rajashekhar, M. and Umashankar, B. (2016), "Preparation of uniform sand specimens using stationary pluviation and vibratory methods", Geotech. Geolog. Eng., 34(6), 1909-1922. https://doi.org/10.1007/s10706-016-0064-0.
  12. Hu, K., Zhang, C.H., Zhou, R.Z. and Gao, F. (2021), "A research for the safety influence of dropping anchor on the submarine pipeline", IOP Conf. Ser. Earth Environ. Sci., 621, 012075. https://doi.org/10.1088/1755-1315/621/1/012075.
  13. Liu, R., Wang, J.Y. and Bie, S.A. (2020), "Study of the penetration depth of an anchor in the dropping anchor process", J. Tianjin Univ. (Sci. Technol.), 53(5), 508-516. https://doi.org/cnki:sun:tjdx.0.2020-05-009. (in Chinese)
  14. Madabhushi, G. (2015), Centrifuge Modelling for Civil Engineers, CRC Press/Taylor & Francis.
  15. Ministry of Housing and Urban Rural Development of the People's Republic of China and State Administration for Market Regulation (2019), Standard for geotechnical testing method (GB/T 50123-2019), Beijing, China. (In Chinese)
  16. Nakamura, M., Nanayakkara, N., Hatazaki, H. and Tsuji, K. (2002), "Reliability analysis of submarine power cables and determination of external mechanical protections", IEEE Trans. Power Deliv., 7(2), 895-902. https://doi.org/10.1109/61.127096.
  17. Ng, C.W.W. and Wong, K.S. (2013a), "Investigation of passive failure and deformation mechanisms due to tunnelling in clay", Can. Geotech. J., 50(4), 359-372. https://doi.org/10.1139/cgj-2012-0098.
  18. Ng, C.W.W., Shi, J.W. and Hong, Y. (2013b), "Three-dimensional centrifuge modelling of basement excavation effects on an existing tunnel in dry sand", Can. Geotech. J., 50(8), 874-888. . https://doi.org/10.1139/cgj-2012-0423.
  19. Ouyang, Y., Zhang, L., Gan, L., Zheng, Y. and Wang, Z. (2016), "Research on numerical simulation of submarine pipeline impacted by an anchor", The 26th International Ocean and Polar Engineering Conference, OnePetro.
  20. Selvadurai, A.P.S. (1993), "The axial loading of a rigid circular anchor plate embedded in an elastic half-space", Int. J. Numer. Anal. Meth. Geomech., 17(5), 343-353. https://doi.org/10.1002/nag.1610170505.
  21. Selvadurai, A.P.S. and Katebi, A. (2016), "The boussinesq-mindlin problem for a non-homogeneous elastic halfspace", Zeitschrift fur angewandte Mathematik und Physik, 67(3), 1-15. https://doi.org/10.1007/s00033-016-0661-z.
  22. Shi, J.W., Chen Y.H., Lu, H., Ma, S.K. and Ng, C.W.W. (2022a), "Centrifuge modeling of the influence of joint stiffness on pipeline response to underneath tunnel excavation", Can. Geotech. J., 59(9), 1568-1586. https://doi.org/10.1139/cgj-2020-0360.
  23. Shi, J.W., Wei, J.Q., Ng, C.W.W., Lu, H. Ma, S.K., Shi, C. and Li P. (2022b), "Effects of construction sequence of double basement excavations on an existing floating pile", Tunnel. Underg. Space Technol., 119, 104230. https://doi.org/10.1016/j.tust.2021.104230.
  24. Shin, H.K., Seo, B.C. and Lee, J.H. (2011), "Experimental study of embedding motion and holding power of drag embedment type anchor (dea) on sand seafloor", Int. J. Nav Arch. Ocean Eng., 3(3), 193-200. https://doi.org/10.3744/jnaoe.2011.3.3.193.
  25. Stewart, D.P. (1992), "Lateral loading of piled bridge abutments due to embankment construction", Ph.D. Thesis, The University of Western Australia, Perth.
  26. Taylor, R.N. (1995), Geotechnical Centrifuge Technology, CRC Press.
  27. Tian, Y., Chai, W., Borgi, S.E., Zhang, C. and Fu, D. (2021), "Assessment of submarine pipeline damages subjected to falling object impact considering the effect of seabed", Marine Struct., 78(5), 102963. https://doi.org/10.1016/j.marstruc.2021.102963.
  28. Tomooka, R., Itoh, K., Tanaka, T. and Suemasa, N. (2019), "Reproduction of slope failure due to rainfall in a centrifuge model test", KEC Conference 2019, Kantipur Engineering College, Dhapakhel Lalitpur.
  29. True, D.G. (1975), "Penetration of projectiles into seafloor soils", True Civil Engineering Laboratory (Navy) Port Hueneme, California, USA.
  30. Wang, C., Zhou, S., Wang, B. and Guo, P. (2018), "Time effect of pile-soil-geogrid-cushion interaction of rigid pile composite foundations under high-speed railway embankments", Geomech. Eng., 16(6), 589-597. https://doi.org/10.12989/gae.2018.16.6.589.
  31. Wang, L.Q., Chia, H.K., Wei, J.W. and Chen, Q. (2009), "FEA-based study of pipeline protection from anchors", ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering, Hawaii, USA.
  32. Wang, W., Wang, X. and Yu, G. (2016), "Penetration depth of torpedo anchor in cohesive soil by free fall", Ocean Eng., 116, 286-294. https://doi.org/10.1016/j.oceaneng.2016.03.003.
  33. Zhang, H., Zhang, J., Lin, R. and Li, Y. (2020), "Numerical study on mechanism responses of submarine pipeline impacted by bar-shaped falling object", J. Pipeline Syst. Eng. Pract., 11(4), 04020051. https://doi.org/10.1061/(ASCE)PS.1949-1204.0000505.
  34. Zhu, X., Hao, Q. and Zhang, J. (2019), "Buried depth of a submarine pipeline based on anchor penetration", J. Marine Sci. Eng., 7(8), 257. https://doi.org/10.3390/jmse7080257.