Browse > Article
http://dx.doi.org/10.12989/gae.2015.9.4.415

Compressibility behaviour of peat reinforced with precast stabilized peat columns and FEM analysis  

Kalantari, Behzad (Civil Engineering Department, Hormozgan University)
Rezazade, Reza K. (Civil Engineering Department, Hormozgan University)
Publication Information
Geomechanics and Engineering / v.9, no.4, 2015 , pp. 415-426 More about this Journal
Abstract
Researches have been done to discover ways to strengthen peat soil deposits. In this model study, fibrous peat that is the most compressible types of peat has been reinforced with precast peat columns stabilized with ordinary Portland cement and polypropylene fibres. Rowe cell consolidation tests as well as plate load tests (PLTs) were conducted on various types of test samples to evaluate the strength and deformation of untreated peat and peat reinforced by various types of columns. PLTs were conducted in a specially designed and fabricated circular steel test tank. The compression index ($C_c$) and recompression index ($C_r$) of fibrous peat samples reduced considerably upon use of precast columns. Also, PLT results confirmed the results obtained from Rowe cell tests. Use of polypropylene fibres added to cement further decreased ($C_c$) and ($C_r$) and increased load bearing capacity of untreated peat. Finite element method (FEM) using Plaxis 3D was carried out to evaluate the stress distributions along various types of tested samples and also, to compare the deformations obtained from FEM analysis with the actual maximum deformations found from PLTs. FEM results indicate that most of the induced stresses are taken on the upper portion of tested samples and reach their maximum values below the loading plate. Also, a close agreement was found between actual deformation values obtained from PLTs and values resulted from FEM analysis for various types of tested samples.
Keywords
precast stabilized peat columns; compression index; recompression index; Rowe cell; Plate load test; FEM;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Alwi, A. (2008), "Ground improvement on Malaysian peat soils using stabilized peat column techniques", Ph.D. Dissertation; University of Malaya, Kuala Lumpur, Malaysia.
2 Amaryan, L.S., Sorokina, G.V. and Ostoumova, L.V. (1973), "Consolidation laws and mechanical-structural properties of peat soils", Proceedings of the 8th International Conference on Soil Mechanics and Foundation Engineering, Moscow, Russia, August, Volume 2, pp. 1-6.
3 American Society for Testing and Materials (ASTM) (1995), Annual book of ASTM standards: Soil and rock, ASTM, PA, USA.
4 Anhtuan, V.U., Ducphong, P., Tuonglai, N. and Yu, H. (2014), "3D finite element analysis on behaviour of piled raft foundations", Appl. Mech. Mater., 580-583, 3-8.   DOI
5 Annual Book of American Society for Testing and Materials (ASTM) Standards (2001), Soil and Rock (I); D420-D 5611, v.04.08.
6 ASTM International, D 4767 (2004), Standard test method for consolidated undrained triaxial compression test for cohesive soils.
7 Axelsson, K., Johansson, S.-E. and Anderson, R. (2002), "Stabilization of organic soils by cement and puzzolanic reactions-feasibility study", Report 3, Swedish Deep Stabilization Research Centre, (English translation), pp. 1-51.
8 Black, A.J., Sivakumar, V., Madhav, M.R. and Hamil, A.G. (2007), "Reinforced stone column in weak deposit: Laboratory model study", J. Geotech. Geoenviron. Eng. ASCE, 133(9), 1154-1161.   DOI
9 BS 1377 (1990), Method of test for soil for civil engineering purposes, British Standard Institution; London, UK.
10 Dang, D.C.N., Jo, S.B. and Kim, D.S. (2013), "Design method of piled-raft foundations under vertical load considering interaction effects", Comput. Geotech., 47, 16-27.   DOI
11 Hebib, S. and Farrell, R.E. (2003), "Some experiences on the stabilization of Irish peats", Can. Geotech. J., 40(1), 107-120.   DOI
12 Forrest, J.B. and MacFarlane, I.C. (1969), "Field studies of response of peat to plate loading", J. Soil Mech Found. Eng. Div. ASCE, 95(4), 949-968.
13 Gautschi, M.A. (1965), "Peat as a foundation soil", Research summary report; NGI, Oslo, Norway.
14 Huat, B.B.K. (2004), "Organic and peat soils engineering", University Putra Malaysia, pp. 5-55.
15 Jorat, M.E., Stefan, K., Tobias, M., Vicki, M. and Willem de, L. (2014), "Strength and compressibility characteristics of peat stabilized with sand columns", Geomech. Eng., Int. J., 6(1), 575-594.
16 Kalantari, B. (2011), "Strength evaluation of air cured, cement treated peat with blast furnace slag", Geomech. Eng., Int. J., 3(3), 207-218.   DOI
17 Kalantari, B. and Huat, B.B.K. (2008), "Stabilization of peat soil using ordinary Portland cement, polypropylene fibers and air curing technique", Electron. J. Geotech. Eng., 13, 13 p.
18 Kalantari, B. and Huat, B.B.K. (2009), "Precast stabilized peat columns to reinforce peat soil deposits", EJGE, 14, 15 p.
19 Kalantari, B., Prasad, A. and Huat, B.B.K. (2010), "Peat stabilization using cement, polypropylene and steel fibres", Geomech. Eng., Int. J., 2(4), 321-335.   DOI   ScienceOn
20 Kim, Y. and Jeong, S. (2011), "Analysis of soil resistance on laterally loaded piles based on 3D soil-pile interaction, Comput. Geotech., 38(2), 248-257.   DOI
21 Lee, I.K., White, W. and Ingles, O.G. (1983), Geotechnical Engineering, Soil Mechanics, (1st Ed.), Pitman Publishing, Marshfield, MA, USA.
22 Nguyen, D.D.C., Jo, S.B. and Kim, D.S. (2013), "Design method of piled-raft foundations under vertical load considering interaction effects", Comput. Geotech., 47, 16-27.   DOI
23 Rahadian, H., Taufik, R. and Moelyanni, D.A. (2001), "Field and laboratory data interpretation of peats at Berengbengkel trial site", Proceedings of an International Conference on In-situ Measurement of Soil Properties and Case Histories, Bali, Indonesia, May, pp. 145-151.
24 Taha, M.R., Abbas, J.M., Shafiqu, Q.S.M. and Chik, Z.H. (2009), The Performance of Laterally Loaded Single Pile Embedded in Cohesionless Soil with Different Water Level Elevation, J. Appl. Sci., 9, 909-916.   DOI
25 von Post, L. and Granlund, E. (1926), Sodra Sveiges torvtillgangangar I, Peat resources in Southern Sweden, Sveriges geoliska undersokning.
26 Yamaguchi, H., Ohira, Y., Kogure, K. and Mori, S. (1985), "Deformation and strength properties of peat", Proceedings of the 11th International Conference on Soil Mechanics and Foundation Engineering, San Francisco, CA, USA, August, Volume 4, pp. 2461-2464.