Geomechanics and Engineering

  • 제29권1호
  • /
  • Pages.13-23
  • /
  • 2022
  • /
  • 2005-307X(pISSN)
  • /
  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Experimental study of strength of cement solidified peat at ultrahigh moisture content

  • Wang, Rong (China Harbour Engineering Company Ltd.)
  • 투고 : 2021.09.25
  • 심사 : 2022.02.19
  • 발행 : 2022.04.10
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Peat soil has the characteristics of high moisture content, large void ratio and low shear strength. In this study, unconfined compressive strength and SEM tests are conducted to investigate the effects of ultrahigh moisture content, cement content, organic content and pH value on the strength of solidified peat. As an increase in the cement content and curing period, the failure mode of solidified peat soil changes from ductile failure to brittle failure. The influence of moisture content on the strength of solidified peat is greater than the cement content. As cement content increases from 10% to 30%, strength of solidified peat at a curing age of 28 days increases by 161%~485%. By increasing water content by 100%, decreases of solidified peat at a curing age of 28 days is 42%~79%. Compared with the strength of solidified peat with a pH value of 5.5, the strength of peat with a pH value of 3.5 reduces by 10% ~ 46%, while the strength of peat with a pH value of 7.0 increases by 8% ~ 38%. It is recommended to use filler materials for stabilizing peat soil with moisture content greater than 200%. Because of small size of clay particles, clay added in the cement solidified peat can improve much higher strength that that of sand.

키워드

참고문헌

  1. Axelsson, K., Johansson, S.E. and Andersson, R. (2002), "Stabilization of organic soils by cement and puzzolanic reactions - feasibility study. Technical report, Swedish Deep Stabilization Research Centre.
  2. Canakci, H., Celik, F. and Edil, T.B. (2019), "Effect of sand column on compressibility and shear strength properties of peat", Eur. J. Environ. Civ. En., 23(9), 1094-1105. https://doi.org/10.1080/19648189.2017.1344142.
  3. Cao, J., Kong, C. and Li, S.P. (2021), "Effect of humic acid on strength of peat soil and its mechanism analysis", J. Saf. Environ., 1-8. https://doi.org/10.13637/j.issn.1009-6094.2021.0765.
  4. Cheng, X., Chen, Y.H., Chen, G. and Li, B.Y. (2021), "Characterization and prediction for the strength development of cement stabilized dredged sediment", Mar Georesour Geotec, 39(9), 1015-1024. https://doi.org/10.1080/1064119X.2020.1795014.
  5. Cheng, A., Lin, W.T. and Huang, R. (2011), "Application of rock wool waste in cement-based composites", Mater Design, 32(2), 636-642. https://doi.org/10.1016/j.matdes.2010.08.014.
  6. Cortellazzo, G. and Cola, S. (1999), Geotechnical characteristics of two Italian peats stabilized with binders. (Eds., Bredenberg, H., Holm, G., and B. Broms, B.), Dry Mix Methods for Deep Soil Stabilization, pages 93-100, Stockholm, Sweden.
  7. De Guzman, E.M.B. and Alfaro, M.C. (2018), "Geotechnical properties of fibrous and amorphous peats for the construction of road embankments", J. Mater Civil Eng., 30(7), 04018149. https://doi.org/10.1061/(ASCE)MT.1943-5533.0002325.
  8. Dehghanbanadaki, A., Arefnia, A., Keshtkarbanaeemoghadam, A., Ahmad, K., Motamedi, S. and Hashim, R. (2016), "Evaluating the compression index of fibrous peat treated with different binders", B Eng. Geol. Environ., 76(2), 575-586. https://doi.org/10.1007/s10064-016-0890-6.
  9. Dehghanbanadaki, A., Motamedi, S. and Ahmad, K. (2020), "FEM-based modelling of stabilized fibrous peat by end-bearing cement deep mixing columns", Geomech. Eng., 20(1), 75-85. https://doi.org/10.12989/gae.2019.20.1.075.
  10. Hernandez-Martinez (2006), "Ground improvement of organic soils using wet deep soil mixing", Ph.D Dissertation, Engineering Department, University of Cambridge, Cambridge.
  11. Hobbs, N.B. (1986), "Mire morphology and the properties and behavior of some British and foreign peats", Q. J. Eng. Geol. Hydroge., 19(1), 7-80. https://doi.org/10.1144/GSL.QJEG.1986.019.01.02.
  12. Huat, B.B.K., Kazemian, S., Prasad, A. and Barghchi, M., (2011), "State of an art review of peat: General perspective", Int. J. Phys. Sci., 6(8), 1988-1996. https://doi.org/10.5897/IJPS11.192.
  13. Jorat, M.E., Kreiter, S., Morz, T., Moon, V. and de Lange, W. (2013), "Strength and compressibility characteristics of peat stabilized with sand columns", Geomech. Eng., 9(4), 415-426. https://doi.org/10.12989/gae.2013.5.6.575.
  14. Kazemian, S., Prasad, A., Huat, B.B.K. and Barghchi, M. (2011), "A state of art review of peat: geotechnical engineering perspective", Int J Phys Sci., 6(8), 1974-1981. https://doi.org/10.5897/IJPS11.396.
  15. Kalantari, B., Prasad, A. and Huat, B.B.K. (2010), "Peat stabilization using cement, polypropylene and steel fibres", Geomech. Eng., 2(4), 321-335. https://doi.org/10.12989/gae.2010.2.4.321.
  16. Kalantari, B. and Rezazade, R.K. (2015), "Compressibility behaviour of peat reinforced with precast stabilized peat columns and FEM analysis", Geomech. Eng., 9(4), 415-426. https://doi.org/10.12989/gae.2015.9.4.415.
  17. Kolay, P.K., Aminur, M.R., Taib, S.N.L. and Zain, M.M. (2011), "Stabilization of tropical peat soil from Sarawak with different stabilizing agents", Geotech. Geol. Eng., 29(6), 1135-1141. https://doi.org/10.1007/s10706-011-9441-x.
  18. Lau, J. (2018), "Static and dynamic performance of biochar enhanced cement stabilized peat", Ph.D Dissertation, Engineering Department, University of Cambridge, Cambridge.
  19. Landva, A.O., Korpijaakko, E.O. and Pheeney, P.E. (1983), "Geotechnical classification of peats and organic soils", In Testing of Peats and Organic Soils, (Ed., P. Jarrett (West Conshohocken, PA: ASTM International), 37-51. https://doi.org/10.1520/STP37333S.
  20. Li, Q., Jiang, Z.Y. and Zhang, C.H. (2017), "Curing peat soil unconfined compressive strength tests", Bull. Chinese Ceramic Soc., 36(2): 686-691. https://doi.org/10.16552/j.cnki.issn1001-1625.2017.02.047.
  21. Meng K., Cui C.Y., Liang Z.M., Li, H.J. and Pei, H.F. (2020), "A new approach for longitudinal vibration of a large-diameter floating pipe pile in visco-elastic soil considering the three-dimensional wave effects", Comput Geotech., 28, 103840. https://doi.org/10.1016/j.compgeo.2020.103840.
  22. Paul, A. and Hussain, M. (2020), "An experiential investigation on the compressibility behavior of cement-treated Indian peat", B Eng. Geol. Environ., 79(3), 1471-1485. https://doi.org/10.1007/s10064-019-01623-x.
  23. Shi, J.W., Ding C., Ng, C.W.W., Lu, H. and Chen L. (2020), "Effects of overconsolidation ratio on tunnel responses due to overlying basement excavation in clay", Tunn Undergr Sp. Tech., 7, 103247. https://doi.org/10.1016/j.tust.2019.103247.
  24. Shi, J.W., Fu, Z.Z. and Guo, W.L. (2019a), "Investigation of geometric effects on three-dimensional tunnel deformation mechanisms due to basement excavation", Comput. Geotech., 106, 108-116. https://doi.org/10.1016/j.compgeo.2018.10.019.
  25. Shi, J.W., Wei, J.Q., Ng, C.W.W. and Lu, H. (2019b), "Stress transfer mechanisms and settlement of a floating pile due to adjacent multi-propped deep excavation in dry sand", Comput. Geotech., 116, 103216. https://doi.org/10.1016/j.compgeo.2019.103216.
  26. Shi, J.W., Wei, J.Q., Ng, C.W.W., Lu, H., Ma, S.K., Shi, C. and Li P. (2022), "Effects of construction sequence of double basement excavations on an existing floating pile", Tunn Undergr Sp. Tech., 119, 104230. https: //doi.org/10.1016/j.tust.2021.104230.
  27. Taha, B. and Nounu, G. (2009), "Utilizing waste recycled glass as sand/cement replacement in concrete", J Mater Civil Eng., 21(12), 709-721. https://doi.org/10.1061/(ASCE)0899-1561(2009)21:12(709).
  28. Timoney, M.J., McCabe, B. and Bell, A.L. (2012), "Experiences of dry soil mixing in highly organic soils", Proceedings of the ICE-Ground Improvement, 165(1), 3-14. https://doi.org/10.1680/grim.2012.165.1.3.
  29. Wang, J., Li, M., Wang, Z. and Shen, L. (2020), "The benefits of using manufactured sand with cement for peat stabilisation: an experimental investigation of physico-chemical and mechanical properties of stabilised peat", B Eng. Geol. Environ., 79(8), 4441-4460. https://doi.org/10.1007/s10064-020-01823-w.
  30. Wang, Z.L., Wang, J.Y., Shen, L.F. et al. (2019), "Effect of red clay replacement on strength of cement stabilized peaty soil", J. Build. Mater., 22(1), 87-93. https://doi.org/10.3969/j.issn.1007-9629.2019.01.013.
  31. Yu, J., Chen, Y.H., Chen, G. and Wang, L. (2019), "Experimental study of the feasibility of using anhydrous sodium metasilicate as a geopolymer activator for soil stabilization", Eng. Geol., 264, 105316. https://doi.org/10.1016/j.enggeo.2019.105316.
  32. Zhang F., Li X.H., Sun W. et al. (2020), "Experimental study on reinforcement of kunming peat soil by deep mixing pile", Build. Constr., 42(6), 1069-1071. https://doi.org/10.14144/j.cnki.jzsg.2020.06.053.