Comparative study of stress-strain characteristic of peat soil

摘要

This paper shows the stress-strain behavior of peat from the perspective ofgeotechnical engineering based on laboratory test. Stress happens when a load applied to a certainspecimen 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 andcompressibility. This research is concerned about the stress-strain behavior of hemic peat. Theundisturbed 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-strainon peat is 0.1mm/min. It is a drained condition test. Both results from each method that obtainedwere compared based on the relationships of stress-strain. Parit Sulong has higher stress-strain thanParit Nipah. If shear stress increased, shear strain also increased. The result shows that, directsimple shear test of stress-strain that tested on hemic is more relevant than a direct shear boxbecause 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 thestress-strain behaviour of peat