TY - JOUR AU - Habib Musa Mohamad, AU - Adnan Zainorabidin, PY - 2021/08/28 Y2 - 2024/03/28 TI - YOUNG’S MODULUS OF PEAT SOIL UNDER CYCLIC LOADING JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 21 IS - 84 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/137 SP - 177-187 AB - <p><strong>Peat soil classified as high organic content with diverse range of fibers, distinctive intrinsic properties with low shear strength.&nbsp; The behaviour of peat soils under dynamic loading conditions has been studied.&nbsp; Therefore, a series laboratory of cyclic triaxial test on peat soil carried out to determine the effect of cyclic loading to the peat soil behavior after subjecting to cyclic loading is presented.&nbsp; In this study, the frequencies applied for the dynamic testing on the peat soil samples were focused and simulated on traffic vehicle loading frequencies, earthquakes and machine operations.&nbsp; Peat soil sample used from Parit Nipat, Malaysia (PNpt) with natural moisture content, <em>m</em> = 603% and liquid limit of <em>w<sub>l</sub></em> = 231%.&nbsp; A series of undrained cyclic triaxial test were performed on undisturbed peat soil sample under isotropically consolidated specimens.&nbsp; In addition, the strain of amplitude applied is 0.1% to investigate the effectiveness of large strain amplitude response by allowing the generation of cyclic pore pressure and developed stress-strain cycle during cyclic loading.&nbsp; Correspondingly, the undrained Young’s modulus of the undrained shear strength subjected to cyclic loading in this study in the range of 60 to 70 for hemic peat soil.&nbsp; The specimen loaded into specific frequency causes in reduction of Young’s modulus related to stiffness and more pronounced in softening behaviour. The hysteresis-loops profile with regard to <em>E</em> parameters from 1<sup>st</sup> cycle to 100<sup>th</sup> cycles of Young’s modulus, <em>E</em> (MPa) for PNpt degrades precisely to an applied effective stress, 0.4 MPa (25 kPa) and 0.4 MPa (50 kPa).&nbsp; Cyclic loading frequencies resulted in decreases of the Young’s Modulus of peat soil that related to stiffness and more pronounced in softening behaviour.&nbsp; The result indicates that a reduction effect in the stress-strain cycle occurs in a peat soil from the initial stage of cyclic loading towards the end of 100<sup>th</sup> cycles due to the repeated loading application</strong><strong>.</strong></p> ER -