Determination of the Post-Cyclic Yield Strength and Initial Stiffness of Two Peat Soils

Abstract

The post-cyclic yield shear strength and initial stiffness of a peat soil after subjecting to cyclic loading is a major topic in this study. Due to the effects of cyclic loading, post-cyclic shear strength decreases lower than its initial strength. A series laboratory static and cyclic triaxial test followed by post-cyclic monotonic tests carried out to determine the yielding parameters. Tests were carried out on the undisturbed samples taken from Parit Nipah, Johor and Lumadan, Sabah within west and east Malaysia peat soils. Postcyclic loading test conducted with effective stress 100 kPa with frequency 1.0Hz. The initial stiffness is the initial tangential modulus with yield shear strength was half of the deviator stress in which two tangential lines intersect. The post cyclic yield shear strength of undisturbed peat soil is considerably lower compared to static at the axial strain of only 1.4% and 1.5%. The Parit Nipah and Lumadan peat are classified as Hemic.

Settlement Behaviour of Stabilised Peat: An Assessment With Eco-Processed Pozzolan (Epp) in Modified Electro-Osmotic Triaxial Cell

“…The pH value for peat, EPP and peat with EPP in this investigation was found to be 3.21 on the acidic scale, 13.02 on alkaline scale and 9 on alkaline scale respectively [14] found that the acidity of peat is ranging between 4.0 to 4.9, [17] found that the pH of peat is between 3.16 to 3.71, and [16] also found that pH of peat ranging from 3.3 to 3.9 on acidic scale. According to [14], the acidity of tropical peat soils ranges from 3 to 5 [23]. Consequently, this finding is regarded as adequate because it is within the range of previous researchers' findings, as shown in Table 1 shows the index properties of KBpt.…”