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황정근,윤여원,송기일 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.4
For the cases where shallow foundation cannot satisfy the requirement of the foundation, engineers choose deep foundations without careful consideration of the cost-effectiveness. However, the bearing capacity of deep foundation is much bigger than shallow foundation. In this study, innovative shallow foundation type is introduced to increase the bearing capacity: The walls are attached to the base-slab of shallow foundation. To validate the performance of suggested shallow foundation, model tests were performed. Three different models (plate-, table-, and box-wall shaped foundations) are constructed in a small and large chamber, respectively. In the small chamber tests, the effect of degree of compaction (40, 60 and 80%) and footing width and wall length ratio (0.2, 0.4, 0.6, 0.8 and 1) on bearing capacity are evaluated. In large chamber test, the performance of wall-shaped foundation with respect to ultimate bearing capacity is evaluated. From the model tests, it is found that box-wall shaped foundation can increase the bearing capacity than table- and plate-wall shaped foundation. Also, the ultimate bearing capacities of box-wall shaped foundation are about 1.8 times than that of shallow foundation without wall.