DOI QR코드

DOI QR Code

Mechanical characteristics + differential settlement of CFG pile and cement-soil compacted pile about composite foundation under train load

  • Cheng, Xuansheng (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology) ;
  • Liu, Gongning (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology) ;
  • Gong, Lijun (Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology) ;
  • Zhou, Xinhai (Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology) ;
  • Shi, Baozhen (China Railway 21st Bureau Group Sixth Engineering Co., LTD.)
  • Received : 2019.02.15
  • Accepted : 2020.01.16
  • Published : 2020.01.25

Abstract

In recent years, the stability, safety and comfort of trains has received increased attention. The mechanical characteristics and differential settlement of the foundation are the main problems studied in high-speed railway research. The mechanical characteristics and differential settlement of the foundation are greatly affected by the ground treatment. Additionally, the effects of train load and earthquakes have a great impact. The dynamic action of the train will increase the vibration acceleration of the foundation and increase the cumulative deformation, and the earthquake action will affect the stability of the substructure. Earthquakes have an important practical significance for the dynamic analysis of the railway operation stage; therefore, considering the impact of earthquakes on the railway substructure stability has engineering significance. In this paper, finite element model of the CFG (Cement Fly-ash Gravel) pile + cement-soil compacted pile about composite foundation is established, and manual numerical incentive method is selected as the simulation principle. The mechanical characteristics and differential settlement of CFG pile + cement-soil compacted pile about composite foundation under train load are studied. The results show: under the train load, the neutral point of the side friction about CFG pile is located at nearly 7/8 of the pile length; the vertical dynamic stress-time history curves of the cement-soil compacted pile, CFG pile and soil between piles are all regular serrated shape, the vertical dynamic stress of CFG pile changes greatly, but the vertical dynamic stress of cement-soil compacted pile and soil between piles does not change much; the vertical displacement of CFG pile, cement-soil compacted pile and soil between piles change very little.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, China Railway 12th Bureau Group Co. LTD., China Railway Construction Investment Group Co. LTD.

This paper is a part of the National Natural Science Foundation of China (Grant number: 51968045 and 51478212), and a part of science and technology project in China Railway 12th Bureau Group Co. LTD. (Grant number: 14B-3), and a part of science and technology project in China Railway Construction Investment Group Co. LTD. (Grant number: 17-C21).

References

  1. Cao, Y.M. and Qu, J.T. (2017), "Influence of subgrade differential settlement on riding performance of high-speed train", Proceedings of the International Congress and Exhibition Sustainable Civil Infrastructures: Innovative Infrastructure Geotechnology, Egypt, July.
  2. Cheng, X.S. and Jing, W. (2017), "Calculation models and stability of composite foundation treated with compacted piles", Geomech. Eng., 13(6), 929-946. https://doi.org/10.12989/gae.2017.13.6.929.
  3. Cheng, Y.P., Bolton, M.D. and Nakata, Y. (2004), "Crushing and plastic deformation of soils simulated using DEM", Geotechnique, 54(2), 131-141. https://doi.org/10.1680/geot.2004.54.2.131.
  4. Chua, K.H., Lo, K.W. and Balendra, T. (1995), "Building response due to subway train traffic", J. Geotech. Eng., 121(11), 747-754. https://doi.org/10.1061/(ASCE)0733-9410(1995)121:11(747).
  5. Cui, W.X. (2016), "Research on the settlement characteristics of subgrade in the test section of Tianjin-Baoding railway", J. Railway Eng. Soc., 33(10), 38-89. https://doi.org/10.3969/j.issn.1006-2106.2016.10.008.
  6. Fang, R., Lu, Z., Yao, H.L., Luo, X.W. and Yang, M.L. (2018), "Study on dynamic responses of unsaturated railway subgrade subjected to moving train load", Soil Dyn. Earthq. Eng., 115, 319-323. https://doi.org/10.1016/j.soildyn.2018.08.037.
  7. Farhadian, H., Aalianvari, A. and Katibeh, H. (2012), "Optimization of analytical equations of groundwater seepage into tunnels: A case study of Amirkabir tunnel", J. Geol. Soc. India, 80, 96-100. https://doi.org/10.1007/s12594-012-0122-z.
  8. Faro, V.P., Consoli, N.C., Schnaid, F., Thome A. and Lopes, L.S. (2015), "Field tests on laterally loaded rigid piles in cement treated soils", J. Geotech. Geoenviron. Eng., 141(6), 06015003(1-7). https://doi.org/10.1061/(ASCE)GT.1943-5606.0001296.
  9. Gupta, S., Hussein, M.F.M., Degrande, G., Hunt, H.E.M. and Clouteau, D. (2007), "A comparison of two numerical models for the prediction of vibrations from underground railway traffic", Soil Dyn. Earthq. Eng., 27(7), 608-624. https://doi.org/10.1016/j.soildyn.2006.12.007.
  10. Hossain, Z., Indraratna, B., Darve, F. and Thakur P. K. (2007), "DEM analysis of angular ballast breakage under cyclic loading", Geomech. Geoeng., 2(3), 175-181. https://doi.org/10.1080/17486020701474962.
  11. Ismail, A. (2018), "ANN-based empirical modelling of pile behaviour under static compressive loading", Front. Struct. Civ. Eng., 12(4), 594-608. https://doi.org/10.1007/s11709-017-0446-2.
  12. Lang, R.Q., Yan S.W., Sun L.Q., Ji, Y.C. and Chen, J. (2018), "Analysis of stress diffusion angle method for PTC pile composite foundation", Eur. J. Environ. Civ. Eng., 22, 434-448. https://doi.org/10.1080/19648189.2017.1369462.
  13. Lee, J.H., Lee J.J., Choi, J.S. and Yun, C.B. (2016), "A semi-analytical approach to predict ground vibration by identification of soil properties and train-transit loads", Adv. Struct. Eng., 15(6), 1013-1029. https://doi.org/10.1260/1369-4332.15.6.1013.
  14. Li, G.Q. (2014), "The dynamic characteristics of CFG pile composite foundation research under the high-speed train load and fatigue life prediction of CFG pile", Master thesis, Xi'an University of Architecture and Technology, Xi'an, China
  15. Li, G.W., Nguyen, T.N. and Amenuvor, A.C. (2016), "Settlement prediction of surcharge preloaded low embankment on soft ground subjected to cyclic loading", Mar. Georesour. Geotechnol., 34(2), 154-161. https://doi.org/10.1080/1064119X.2014.985860.
  16. Liu, J.F., Zheng, G. and Gong, X.N. (2018), "Superimposed stress method to calculate settlement of embankment with rigid-pile composite foundation", Chin. J. Geotech. Eng., 40(11),1995-2002. https://doi.org/10.11779/CJGE201811005.
  17. Ministry of Railways of the People's Republic of China (2014), "TB10621-2014 Code for design of high speed railway", Ministry of Railways of the People's Republic of China, Beijing, China.
  18. Pan, C.S. and Pande, G.N. (1984), "Preliminary deterministic finite element study on a tunnel driven in loess subjected to train loading", China Civ. Eng. J., 17(4), 18-28. https://doi.org/10.15951/j.tmgcxb.1984.04.002.
  19. Sales, M.M., Prezzi, M., Salgado, R., Choi, Y.S. and Lee, J. (2017), "Load-settlement behaviour of model pile groups in sand under vertical load", J. Civ. Eng. Manage., 23(8), 1148-1163. https://doi.org/10.3846/13923730.2017.1396559.
  20. Sharma, V. J., Vasanvala, S.A. and Solanki, C.H. (2015), "Study of cushioned composite piled raft foundation behaviour under seismic forces", Australian J. Civ. Eng., 13(1), 32-39. https://doi.org/10.1080/14488353.2015.1092636.
  21. Siegel, T.C. (2011), "Simplified settlement model for a shallow foundation on composite ground with rigid piles", DFI J. J. Deep Found. Inst., 5(1), 68-72. https://doi.org/10.1179/dfi.2011.006.
  22. Sobhan, K., Ramirez, J. and Reddy, D. (2012), "Cement stabilization of highly organic subgrade soils to control secondary compression settlement", Transport. Res. Rec. J. Transport. Res. Board, 2310, 103-112. https://doi.org/10.3141/2310-11.
  23. Yin F., Liu H.L., Chen Y.M., Li J.B. and Zhou, H. (2018), "Dynamic response of XCC pile-geogrid composite foundation of expressways influenced by vehicles with different speeds", Chin. J. Geotech. Eng., 40(3), 546-553. https://doi.org/10.11779/CJGE201803020.
  24. Zhi, B., Li, G., Wang Y.X., Guo, J. and Wang, F. (2017), "Experimental research on load-bearing property of CFG pile composite foundation", Build. Struct., 47(23), 100-102. https://doi.org/10.19701/j.jzjg.2017.23.020.

Cited by

  1. Dynamic response of CFG and cement-soil pile composite foundation in the operation stage vol.26, pp.4, 2020, https://doi.org/10.12989/gae.2021.26.4.385