A critical performance study of innovative lightweight fill to mitigate settlement of embankment constructed on peat soil

Tuan Ismail, Tuan Noor Hasanah (2017) A critical performance study of innovative lightweight fill to mitigate settlement of embankment constructed on peat soil. PhD thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Infrastructure construction now demands the development on soft ground such as peat. Discomfort of road users such as bumpy road need to be addressed with the use of appropriate lightweight and stiff backfill materials. Alternative lightweight fills used in current highway construction is critically reviewed in this research prior to the conceptual development of a stiff lightweight mat (Geocomposite Cellular Mat, GCM). The GCM concept is somewhat similar to the EPS concept by virtue of the mat form. However, the EPS is lighter than GCM, but the GCM is much stronger, stiffer, more porous and permeable. The performance of the GCM on hemic peat ground at the test site in Parit Nipah, Johor was compared with that from conventional backfill (sand fill). The typical geotechnical properties of Parit Nipah peat were high in organic content (85.3 %), high in moisture content (> 600 %) and low in undrained shear strength (< 15 kPa). The consolidation characteristics of Parit Nipah peat was obtained from both laboratory and field tests using Terzaghi’s, and hyperbolic methods. The settlement predicted by hyperbolic method gave a better agreement with the field data. The field tests were environmentally monitored and innovative field instrumentation for the settlement monitoring was specially designed for this research. The research effectively demonstrates potential for the use of GCM to mitigate settlement of highway embankment built on peat ground. The field observation showed that the maximum settlements were reduced up to 84 % with the adoption of GCM fills. Furthermore, 70 % differential settlement was reduced with GCM fill compared with sand fill. GCM fills not only reduces excessive settlement but also reduces the differential settlement. However, they also effectively accelerate the consolidation settlement within the sub-grade through the ease of dissipation of the excess pore water pressure through the open-porous cellular structure of the GCM fills.

Item Type:Thesis (PhD)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
ID Code:9960
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:02 May 2018 16:58
Last Modified:02 May 2018 16:58

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