Piled raft foundations have become a prominent foundation system in recent years as they combine bearing capacities of piles and raft. For this reason, comprehensive analytical, numerical and experimental studies have been carried out for reliable and economic design of piled raft foundations. In this study, vertical stress increments were mainly investigated experimentally and numerically. In the experimental study, model composite (steel and concrete) piles with a diameter of 20 mm and lengths of 200 and 300 mm were used. The raft was made of steel plate with plan dimensions of 160 × 160 mm and a thickness of 6 mm. The pressure gauges were placed at 2.5D, 5D and 7.5D intervals axially below center of model piled raft in the sand. The tests were carried out at different relative densities with the model piled raft. After model tests, numerical analyses were carried out with the FEM-based software ABAQUS, and the results were compared with the experimental results. From the tests results, it is determined that the piled raft foundations transfer loads to the deep layers with the help of piles, and the vertical stress increment reduces downward from the end of the piles. However, it is seen that the increase in relative density decreases the vertical stress increments in sand for same load. Some design parameters are suggested for use in foundation engineering applications.

由于桩筏基础结合了桩和筏的承载力，因此近年来已成为一个著名的地基系统。因此，已经进行了综合的分析，数值和实验研究，以对桩筏基础进行可靠且经济的设计。在这项研究中，垂直应力增量主要通过实验和数值研究。在实验研究中，使用了直径为20 mm，长度分别为200和300 mm的模型复合材料（钢和混凝土）桩。木筏由钢板制成，平面尺寸为160×160 mm，厚度为6 mm。将压力表以2.5D，5D和7.5D的间隔轴向放置在沙子中模型桩筏中心的轴向下方。试验是在不同的相对密度下使用模型桩筏进行的。经过模型测试 使用基于FEM的软件ABAQUS进行了数值分析，并将结果与​​实验结果进行了比较。从测试结果可以确定，桩筏基础在桩的帮助下将载荷传递到深层，并且垂直应力增量从桩端开始向下减小。但是，可以看出，相对密度的增加降低了相同载荷下砂土的垂直应力增量。建议在基础工程应用中使用一些设计参数。垂直应力增量从桩的末端向下减小。但是，可以看出，相对密度的增加降低了相同载荷下砂土的垂直应力增量。建议在基础工程应用中使用一些设计参数。垂直应力增量从桩的末端向下减小。但是，可以看出，相对密度的增加降低了相同载荷下砂土的垂直应力增量。建议在基础工程应用中使用一些设计参数。