Compressibility behaviour and engineering properties of North Borneo Peat Soil

Abstract

Article InfoIt is known that peat soil is highly compressible. A constituent of peat soil from Klias, Sabah covering a wide range of index properties of fiber contents, specific gravity, organic contents and moisture contents were subjected to one-dimensional consolidation tests. This paper presents the engineering properties and compressibility behavior of sapric type of tropical peat soil. In this role, the high compressibility of Klias peat stands out as a most significant engineering property. With this intention, the purpose of this paper is to provide a simple and analytical means for predicting the consolidation settlement of sapric peat deposit under loading. The rate of primary compression, after a certain time. Increases with the logarithm of time. Loading applied from low stress to high stresses started from 2, 6.25, 12.5, 25, 50, 100 and 200 kPa resulting in high compression index, Cc and ratio, C'c. The Klias peat soil represented sapric type of tropical peat with organic content is 98.43% and lower fiber content which is about 18% of the specimen. Compressibility index Cc, Coefficient of consolidation Cv, and Compression index, Cc, was identified as a crucial component of parameters in determination of settlements behaviour of peat soil. The coefficient of consolidation, Cv, was determined within the range of 1.264 to 12.911 cm 2 /min and requires special considerations in laboratory testing procedures and interpretation of results.

Physicochemical and Microstructural Characterization of Klias Peat, Lumadan POFA, and GGBFS for Geopolymer Based Soil Stabilization

“…Additionally, based on the von Post criteria, the Klias peat soil was classified as hemic peat (H6). The natural moisture content obtained was 657%, within the range of previously published values for peat originating from Klias, Beaufort, and Sabah [58,59]. The organic content was valued at 96.57%, and conventional values of organic content for peat soils from East Malaysia are within the range of 50-98% [1].…”

A Study on Linear Shrinkage Behavior of Peat Soil Stabilized with Eco-Processed Pozzolan (EPP)

“…Muscovite is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl₂(F, OH)₂ and identified as mineral of the mica family. It is an important rock-forming mineral which is appeared less resistant to micro-organism weathering than biotite and the latter less than orthoclase [33][34][35]. This finding clearly shows that the crystallization process between peat and EPP contributes to the development of compact structure and filled micro spaces or void in peat soil.…”

“…Zainorabidin & Mohamad [26] found that differences in moisture content existed and were influenced by a variety of factors, including variations in groundwater level at the location and undrained forest conditions. These differences in results are attributable to climate change because of changes in temperature, precipitation, and rainfall impacting soil saturation intensity, where the water table forms in a roughly horizontal plane and may rise to a level larger or less than the actual water table [29]. Furthermore, particle size has an impact on moisture content.…”

Maximum Strain Effect and Secant Modulus Variation of Hemic Peat Soil at large Deformation due to Cyclic Loading

“…At this stage, cyclic shear strains would lead to strain softening, particle structure breakdown and a rapid deterioration of stress-strain-shear strength characteristics up to the plastic threshold. It is known that peat soil is highly compressible [36] thus, the compressible behaviour of peat soil seen as the major causes to the changes in shear strength which in line with the statement where peat is soft and easily compressed when load imposed [37].…”

“…The post-cyclic yield shear strength of undisturbed peat soil is considerably lower compared to static while cyclic loading is imposed to specimens after 100 numbers of cycles. The initial stiffness of post-cyclic for peat soil is governed by the softening behaviour that occurred when the specimen exhibited ± 1.5% axial strain [32,36]. However, peat still showing the peculiarities behaviour consistently that showed, peat is not easy to handle and yet, challenging to the author.…”