Peat is one of the most problematic sub-soil foundation. It had high compressibility, low shear strength, and excessive and long-term settlement when subjected to imposed loads of construction. The efficient method for improvement of peat was preloading. It consists of applying a load in the form of the embankment. One of the alternatives for supported embankment construction was the use of nailed-slab system. A small-scale model laboratory research and settlement analysis were conducted to identify the effectiveness of nailed-slab system in reducing peat settlement due to the embankment. The research results indicated that the installation of piles on slabs was able to reduce the settlement of slabs and increase the modulus of sub-grade reaction. The performance of piles and slab were monolithically connected, it was more effective than non-monolithic piles.
The authors would like to thank the head and the technicians of the Soil Mechanics Laboratory of Gadjah Mada University for their help during the experimental work. Great appreciation is also given to Ministry of Research, Technology and Higher Education of the Republic of Indonesia for the financial support.
H., Oh, E., & Chai, G. (2013). Characteristics of embedded peat in coastal
environmental. International Journal of Geomate, 5(1), 609-618.
Kazemian, S., Prasad, A., Huat, B. B., & Barghchi, M. (2011). A state of art review of peat: Geotechnical engineering perspective. International Journal of Physical Sciences, 6(8), 1974-1981.
Vakher, M. (2004). Soil Model Selection in Earth-Based Extreme Region with Peat Foundation under Large Loading Area. In Engineering, Construction, and Operations in Challenging Environments: Earth and Space 2004, (pp. 767-774).
Toh, C. T., Chee, S. K., Lee, C. H., & Wee S. H. (1994). Geotextile-bamboo fascine mattress for filling over very soft soils in Malaysia. Geotextiles and Geomembranes, 13(6-7), 357-369.
Porbaha, A., Hanzawa, H., & Kishida, T. (2000). Analysis of a failed embankment on peaty ground. Slope Stability 2000, (pp. 281-293).
Mesri, G., Stark, T. D., Ajlouni, M. A., & Chen, C. S. (1997). Secondary compression of peat with or without surcharging. Journal of Geotechnical and Geoenvironmental Engineering, 123(5), 411-421.
Mesri, G., & Ajlouni, M. (2007). Engineering properties of fibrous peats. Journal of Geotechnical and Geoenvironmental Engineering, 133(7), 850-866.
Waruwu, A., Hardiyatmo, H. C., & Rifa’I, A. (2016). Compressive behavior of Bagansiapiapi-Riau Peat in Indonesia. Electronic Journal of Geotechnical Engineering, 21(16), 5217-5227.
Kamao, S. (2016). Creep and relaxation behavior of highly organic soil. International Journal of Geomate, 11(25), 2506-2511.
Susanti, R. D., Maulana, & Waruwu, A. (2017). Bearing capacity improvement of peat soil by preloading. ARPN Journal of Engineering and Applied Sciences, 12(1), 121-124.
Rowe, R. K., & Li A. L. (2005). Geosynthetic-reinforced embankments over soft foundations. Geosynthetics International, 12(1), 50-85.
Vakher, M. (2000). Load-Deformation Performance of Peat Soil Under Large Concrete Plates. In Geotechnical Measurements: Lab and Field (pp. 44-55).
Liu, H. L., Ng, C. W., & Fei, K. (2007). Performance of a geogrid-reinforced and pile-supported highway embankment over soft clay: case study. Journal of Geotechnical and Geoenvironmental Engineering, 133(12), 1483-1493.
Diana, W., Hardiyatmo, H. C., & Suhendro, B. (2017). Effect of pile connections on the performance of the nailed-slab system on the expansive soil. International Journal of Geomate, 12(2), 134-141.
Hardiyatmo, H. C. (2011). Method to analyze the deflection of the nailed-slab system. International Journal of Civil & Environmental Engineering, 11(4), 22-28.
Puri, A., Hardiyatmo, H. C., Suhendro, B., & Rifa’I, A. (2013). Pile Spacing and Length Effects Due To the Additional Modulus of Subgrade Reaction of the Nailed-Slab System on the Soft Clay. In Proc. of 13th Symposium on Quality in Reseach (QiR) (pp: 1032-1310).
Asaoka, A. (1978). Observational procedure of settlement prediction. Soil and Foundations, 8(4), 87-101.
Huat, B. B., Hoe, N. C., & Munzir, H. A. (2004). Observational methods for predicting embankment settlement. Pertanika J. Sci. Technol., 12(1), 115-128.
Li, C. (2014). A simplifi ed method for prediction of embankment settlement in clays. Journal of Rock Mechanics and Geotechnical Engineering, 6(1), 61–66.
Tan, T. S., Inoue, T., & Lee, S. L. (1991). Hyperbolic method for consolidation analysis. Journal of Geotechnical Engineering, 117(11), 1723-1737.
Brinkgreve, R. B. J. (2002). PLAXIS 2D – Version 8”, A. A. Balkema Publishers, Netherlands.
Ryltenius, A. (2011). FEM Modelling of piled raft foundations in two and three dimensions”, Master’s Dissertation, Geotechnical Engineering, Department of Construction Sciences, Lund University, Swedia.