Stress Path Behaviour and Friction Angle Transition Due to the Cyclic Loading Effects

Habib Musa Mohamad, Adnan Zainorabidin, Adriana Erica Amaludin


In various aspects, peat soil is different from mineral soil. Peat is a biogenic deposit that emerged within the last 10,000 years, during the post-glacial (Holocene) era. Peat is a soft soil that is unable to support external loads without experiencing significant deformations. Tyre pressure from automobiles and/or aeroplane wheels on paved surfaces creates traffic load, which can manifest as static or dynamic types of loading. To resolve the problem with peat soils, a thorough understanding of the static and dynamic behaviour of peat is still required. Many people who live near regularly used highways feel traffic vibration, and it is important to comprehend the nature of this issue to make predictions about potential solutions to this problem. As such, this study aims to investigate the cohesion (c) and friction angle (φ) properties of peat soil after it has been subjected to cyclic stress. Monotonic triaxial tests are conducted to ascertain the initial shear strength characteristics of the soil. Cyclic triaxial tests are performed with half of their maximum deviator stress to simulate the behaviour of peat soil under various effective stresses and frequencies of loading that are applied with 100 number of cycles. After applying various numbers of cycles of dynamic loading, the post-cyclic monotonic shear strengths were subsequently evaluated. It has been noted that irregular behaviour tends to occur more frequently at higher frequencies, particularly between 2 and 3 Hz. With higher frequencies being applied, the reduction in cohesion and friction angle becomes more evident.


Doi: 10.28991/CEJ-2023-09-04-010

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Post-cyclic; Shear Strength; Triaxial; Peat Soil; Dynamic Loading; Cohesion; Friction Angle.


Nicholson, P. G. (2014). Soil Improvement and Ground Modification Methods. Butterworth-Heinemann, Oxford, United Kingdom. doi:10.1016/C2012-0-02804-9.

S Huat, B. B., Prasad, A., Kazemian, S., & Anggraini, V. (2019). Ground improvement techniques. CRC Press, London, United Kingdom. doi:10.1201/9780429507656.

Whitlow, R. (2001). Basic soil mechanics (4th Ed.). Pearson Education, London, United Kingdom.

Gosling, D., & Keeton, P. (2008). Problems with Testing Peat for Stability Analysis. Peat Seminar, The Geological Society, 11 March, 2008, Edinburgh, Scotland.

Boylan, N., & Long, M. (2014). Evaluation of peat strength for stability assessments. Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 167(5), 421–430. doi:10.1680/geng.12.00043.

Warburton, J., Holden, J., & Mills, A. J. (2004). Hydrological controls of surficial mass movements in peat. Earth-Science Reviews, 67(1–2), 139–156. doi:10.1016/j.earscirev.2004.03.003.

Boylan, N., Jennings, P., & Long, M. (2008). Peat slope failure in Ireland. Quarterly Journal of Engineering Geology and Hydrogeology, 41(1), 93–108. doi:10.1144/1470-9236/06-028.

Das, B. M. (2021). Principles of geotechnical engineering. Cengage Learning, Boston, United States.

Erken, A., Kaya, Z., & Şener, A. (2008). Post Cyclic Shear Strength of Fine Grained Soils in Adapazari–Turkey during 1999 Kocaeli Earthquake. 14th World Conference on Earthquake Engineering, 12-17 October, Beijing, China.

Ghadr, S., Assadi-Langroudi, A., & Hung, C. (2020). Stabilization of peat with colloidal nanosilica. Mires and Peat, 26, 1–13. doi:10.19189/MaP.2019.OMB.StA.1896.

Edil, T. B. (2003). Recent advances in geotechnical characterization and construction over peats and organic soils. Proceedings 2nd International Conference on Advances in Soft Soil Engineering and Technology, 2-4 July, 2003, Putrajaya, Malaysia.

Yamaguchi, H., Hashizume, Y., & Ikenaga, H. (1992). Change in pore size distribution of peat in shear processes. Soils and Foundations, 32(4), 1–16. doi:10.3208/sandf1972.32.4_1.

Cola, S., & Cortellazzo, G. (2005). The shear strength behavior of two peaty soils. Geotechnical and Geological Engineering, 23(6), 679–695. doi:10.1007/s10706-004-9223-9.

Mohamad, H. M., Zainorabidin, A., & Mohamad, M. I. (2022). Maximum Strain Effect and Secant Modulus Variation of Hemic Peat Soil at large Deformation due to Cyclic Loading. Civil Engineering Journal (Iran), 8(10), 2243–2260. doi:10.28991/CEJ-2022-08-10-015.

Mohamad, H. M., Adnan, Z., & Hassan, N. A. (2022). Influence of Cyclic Loading to the Post- Cyclic Shear Strength Behaviour of Peat Soil. Journal of Engineering Science and Technology, 17(4), 2997–3011.

Vucetic, M. (1994). Cyclic threshold shear strains in soils. Journal of Geotechnical Engineering, 120(12), 2208–2228. doi:10.1061/(ASCE)0733-9410(1994)120:12(2208).

Farrell, E. R., & Hebib, S. (1998). The determination of the geotechnical parameters of organic soils. Problematic Soils, 33-36.

Boulanger, R. W., Arulnathan, R., Harder, L. F., Torres, R. A., & Driller, M. W. (1998). Dynamic Properties of Sherman Island Peat. Journal of Geotechnical and Geoenvironmental Engineering, 124(1), 12–20. doi:10.1061/(asce)1090-0241(1998)124:1(12).

Ishihara, K. (1997). Soil behaviour in earthquake geotechnics. (1997). Choice Reviews Online, 34(09), 34-5113-34–5113. doi:10.5860/choice.34-5113.

Yang, J., & Sze, H. Y. (2011). Cyclic behaviour and resistance of saturated sand under non-symmetrical loading conditions. Geotechnique, 61(1), 59–73. doi:10.1680/geot.9.P.019.

Azhar, A. T. S., Norhaliza, W., Ismail, B., Abdullah, M. E., & Zakaria, M. N. (2016). Comparison of Shear Strength Properties for Undisturbed and Reconstituted Parit Nipah Peat, Johor. IOP Conference Series: Materials Science and Engineering, 160, 012058. doi:10.1088/1757-899x/160/1/012058.

Masirin, M. I. M., Ali, A. S. B., Mustapa, M. S., Rahman, R. A., Wagiman, A., & Aziz, M. I. (2020). Analysis of physical and microstructural properties on parit nipah peat particles as sustainable asphalt modifier. Materials Science Forum, Trans Tech Publications Ltd, 975, 197-202. doi:10.4028/

Zainorabidin, A., & Mansor, S. H. (2015). Comparative Study of Stress-Strain Characteristic of Peat Soil. Applied Mechanics and Materials, 773–774(February), 1448–1452. doi:10.4028/

Zainorabidin, A., & Mohamad, H. M. (2016). A geotechnical exploration of Sabah peat soil: Engineering classifications and field surveys. Electronic Journal of Geotechnical Engineering, 21(20), 6671–6687.

Huat, B. B. K., Prasad, A., Asadi, A., & Kazemian, S. (2014). Geotechnics of organic soils and peat. CRC Press, London, United Kingdom. doi:10.1201/b15627.

Zainorabidin, A., & Mohamad, H. M. (2016). Preliminary peat surveys in ecoregion delineation of North Borneo: Engineering perspective. Electronic Journal of Geotechnical Engineering, 21(12), 4485–4493.

O’Kelly, B. C. (2015). Atterberg limits are not appropriate for peat soils. Geotechnical Research, 2(3), 123–134. doi:10.1680/jgere.15.00007.

BS 1377-8:1990. (1990). Soils for civil engineering purposes. Shear strength tests (effective stress) (AMD 8263). British Standards Institution, London, United Kingdom.

Zolkefle, S. N. A. (2014). The dynamic characteristic of Southwest Johor peat under different frequencies. Master Thesis, University Tun Hussein Onn Malaysia (UTHM), Johor Bahru, Malaysia.

Knappett, J., & Craig, R. F. (2019). Craig's soil mechanics (9th Ed.). CRC Press, London, United Kingdom. doi:10.1201/9781351052740.

Lau, J. Z. E. (2019). Static and dynamic performance of biochar enhanced cement stabilized peat. Ph.D. Thesis, University of Cambridge, Cambridge, United Kingdom.

Basri, K., Zainorabidin, A., Mohamad, H. M., & Musta, B. (2021). Determining the peat soil dynamic properties using geophysical methods. Magazine of Civil Engineering, 105(5). doi:10.34910/MCE.105.8.

Mohamad, H. M., & Zainorabidin, A. (2021). Young’S Modulus of Peat Soil Under Cyclic Loading. International Journal of GEOMATE, 21(84), 177–187. doi:10.21660/2021.84.j2164.

Hao, R., Zhang, Z., Guo, Z., Huang, X., Lv, Q., Wang, J., & Liu, T. (2022). Investigation of changes to triaxial shear strength parameters and microstructure of yili loess with drying–wetting cycles. Materials, 15(1), 255. doi:10.3390/ma15010255.

Abdullah, H. H., Shahin, M. A., Walske, M. L., & Karrech, A. (2021). Cyclic behaviour of clay stabilized with fly-ash based geopolymer incorporating ground granulated slag. Transportation Geotechnics, 26. doi:10.1016/j.trgeo.2020.100430.

Wang, S. (2011). Post cyclic behavior of low-plasticity silt. PhD Thesis, Missouri University of Science and Technology, Rolla‎, United States‎.

Wang, S., Luna, R., & Onyejekwe, S. (2016). Effect of Initial Consolidation Condition on Post cyclic Undrained Monotonic Shear Behavior of Mississippi River Valley Silt. Journal of Geotechnical and Geoenvironmental Engineering, 142(2), 4015075. doi:10.1061/(asce)gt.1943-5606.0001401.

Yasuhara, K., Hirao, K., & FL Hyde, A. (1992). Effects of cyclic loading on undrained strength and compressibility of clay. Soils and Foundations, 32(1), 100–116. doi:10.3208/sandf1972.32.100.

Ho, J., Goh, S. H., & Lee, F. H. (2013). Post Cyclic Behaviour of Singapore Marine Clay. Le comportement post-cyclique de l’argile marine de Singapour. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, 2-6 September, 2013, Paris, France.

Guo, L., Jin, H., Wang, J., & Shi, L. (2020). Undrained monotonic shear behavior of marine soft clay after long-term cyclic loading. Marine Georesources and Geotechnology, 38(7), 854–866. doi:10.1080/1064119X.2019.1636906.

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DOI: 10.28991/CEJ-2023-09-04-010


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