Basri, Kasbi (2023) Dynamic properties of Malaysian peat soil based on field geophysical methods. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The small strain dynamic properties of peat soil are a fundamental parameter related to the mechanical behavior of a structure constructed on peat ground. Lab-based studies are frequently used to determine the dynamic properties despite the risk of underestimating or overestimating the values due to sample disturbance. This study performed a geophysical method known as multichannel analysis of surface waves (MASW) to determine peat's in-situ dynamic properties. Meanwhile, seismic refraction (SR), electrical resistivity tomography (ERT) and peat sampler were conducted to delineate the peat stratigraphy. The study locations include Parit Nipah, Tanjung Piai, Pontian, Sedenak, Medan Sari and Klias. To ensure high-quality data was obtained, the optimum field configuration for the active MASW method was established for peat conditions. Based on the finding, high-resolution data were obtained using, dx=1m, X1=1/2L, an active source of 7 kg sledgehammer with rubber plate, 5 data stackings, 4.5 Hz geophone type and 100 to 250 μs of the sampling interval. The optimum field configuration established resulted in higher accuracy data collection and analysis of the dynamic properties. The results showed that the value of Vs, Vp, Gmax and Emax ranged from 24.5 to 67.1 m/s, 300 to 577 m/s, 0.4 to 7.1 MPa and 1.2 to 21.1 MPa, respectively. Correlations were also established between the dynamic properties and index properties of peat. There appears to be an excellent link between peat's dynamic properties and index properties. The dynamic properties show an increasing pattern with decreasing moisture, organic and fiber content. Meanwhile, an increase in specific gravity and bulk density results in an increase in dynamic properties. Overall, peat's dynamic properties were similar and in good agreement with the laboratory-based dynamic properties from the literature. Finally, the findings in this study contributed to improving the understanding of the dynamic behavior of peat especially for settlement prediction and embankment design

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