Geotechnical characteristics of peat soil in OKI area, South Sumatra, Indonesia
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Abstract
Peat soil is characterized by a high-water table, significant compressibility, and low bearing capacity. Due to these characteristics, precise information about the physical, hydraulic, and mechanical properties of peat soil is required for the successful evaluation of suitability and improvement techniques in determining safe infrastructure through field and laboratory investigations. In this paper, soil properties, permeability, vane shear tests, and triaxial tests were conducted on peat soil at the locations of Kayu Agung, Pedamaran, Pedamaran Timur, and Ogan Komering Ilir (OKI), South Sumatra. Based on the samples obtained from the borings, the average thickness of peat soil was categorized as very deep, except for the location in Pedamaran, which was extremely deep. The moisture content in the OKI area ranged from 350% to 635%, with the largest in the Pedamaran Timur district. Furthermore, samples from OKI were classified as sapric peat soil, with ash content ranging from 19.71% to 39.24%, showing high ash and moderately acidic. The correlation of various geotechnical properties of peat soil was very close, and new equations were developed. Based on the results of the Vane Shear Test and Triaxial Unconsolidated Undrained test, the consistency of the soil at each location point was found to be very soft. These results provide valuable information for identifying appropriate design parameters and establishing correlations needed for evaluating peat soil.
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