Abstract
This paper shows the stress-strain behavior of peat from the perspective of geotechnical engineering based on laboratory test. Stress happens when a load applied to a certain specimen and deformed the specimen while strain is the response from applied stress on a specimen. Peat is known as an ultimate soft soil in engineering terms because it has low shear strength and compressibility. This research is concerned about the stress-strain behavior of hemic peat. The undisturbed samples were collected at Parit Sulong and Parit Nipah, Batu Pahat, Johore, Malaysia. Normal stresses are 12.5kPa, 25kPa, 50kPa and 100kPa. The shear rate to determine the stress-strain on peat is 0.1mm/min. It is a drained condition test. Both results from each method that obtained were compared based on the relationships of stress-strain. Parit Sulong has higher stress-strain than Parit Nipah. If shear stress increased, shear strain also increased. The result shows that, direct simple shear test of stress-strain that tested on hemic is more relevant than a direct shear box because DSS shear the entire specimen of peat while DSB only shear at the center of the specimen. Geotechnical engineers can use the direct simple shear method to understand efficiently about the stress-strain behaviour of peat.
Highlights
It can be categorized as problematic soil, because of low shear strength and the determination of shear strength of peat soil is difficult in geotechnical
The relationship between the shear stress and shear strain obtained from direct simple shear test are shown in Figure 5 between Parit Nipah and Parit Sulong, Batu Pahat, Johore
The shear stress increases with shearing shear strain initially until reaching a peak, after which shear failure occurs, which is signified by a plateau in the stress-strain response
Summary
Direct simple shear was an upgraded device from a direct shear box that is to measure the stress-strain of soil. Both devices can apply shear directly to the soil specimen, the direct shear box test suffers from stress inhomogeneity [3]. This research will focus on the differences in the stress-strain measured during direct shear box and direct simple shear tests on peat. Direct simple shear test can shear a soil to unlimited displacement without creating a substantial non-uniformity in stress and strain distributions.
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