THE SETTLEMENT BEHAVIOR OF ISOLATED FOUNDATION ON KHON KAEN LOESS
Keywords:Isolated Foundation, Khon Kaen Loess, Settlement, Collapsible Soil,, Soil Water Characteristic Curve
This research presents the settlement behavior of isolated foundations on Khon Kaen loess, classified as collapsible soil. The pressure sequence was applied to the center of the cast foundation, in which the maximum applied pressure was 200 kPa. The test was conducted in the field. The effect of the foundation’s size and depth on the settlement were investigated. Three foundation sizes, 1.0x1.0, 1.2x1.2, and 1.5x1.5 meters, were installed at a 1.0 meter depth. Moreover, 1.0x1.0 m foundation sizes were installed at 0.5, 1.0, and 1.5 meter depths. The saturation degree’s effect was also studied by testing in the rainy and the summer seasons. The initial and final saturation degree was used to classify the soil condition using the SWCC obtained from laboratory tests.The study found that the foundation size affects the foundation settlement, as the larger foundation showed large settlement. Conversely, this study encountered no foundation depth effect on the settlement. However, the Khon Kaen loess condition affected the settlement more. The foundation on the wet Khon Kaen loess presented a larger settlement than it did on the dry Khon Kaen loess. Therefore, the design of an isolated foundation on Khon Kaen loess must consider the foundation settlement on wet Khon Kaen loess. Moreover, this study had also soaked the foundation at 200 kPa to apply pressure for three hours. The test showed that the settlement increased by approximately 1 to 1.5 times.