Understanding the load transfer mechanism and the load settlement behavior of non-connected piled raft foundations with cushion is so complicated. In the present research, based on the assumption of an axisymmetric cylindrical unit cell including pile, subsoil, cushion, and raft, an analytical model is developed and introduced. This model is capable of estimating the transferred vertical stress from raft to piles head and subsoil, compression of cushion, and differential settlement between pile head and subsoil. Also, an experimental test program has been introduced to investigate the behavior of non-connected piled raft foundations and to validate the proposed model. To represent the effectiveness of using non-connected piled raft with different cushion thickness, number, and length of piles measure with the unpiled raft, the load improvement ratio and the settlement efficiency ratio are used. According to the results, the minimum increase in the bearing capacity and the reduction in the settlement of non-connected piled raft to the unpiled raft are 42% and 38% respectively. Also, increasing the cushion thickness increases the differential settlement at the pile head elevation, and for a given number and length of pile, reduced the bearing capacity of the piled raft by 30%. The good agreement of model predictions with the experimental results is verified. The difference between the experimental and analytical values of the cushion compression above the pile head is within an acceptable range.

了解具有垫层的非连接式桩筏基础的载荷传递机理和载荷沉降行为非常复杂。在目前的研究中，基于包括桩，地基，垫层和筏板的轴对称圆柱单元的假设，开发并引入了解析模型。该模型能够估计从筏板到桩头和桩底土的垂直应力，垫层的压缩以及桩头和桩底土之间的差异沉降。此外，还引入了一个实验测试程序来研究非连接式桩筏基础的行为并验证所提出的模型。为了表示使用未连接筏的非连接桩筏在不同垫层厚度，数量和长度方面的有效性，使用负荷改善率和沉降效率率。根据结果​​，承载力的最小增加和未连接的堆叠筏到未堆叠筏的沉降减少分别为42％和38％。此外，增加垫层厚度会增加桩头高度处的差异沉降，对于给定数量和长度的桩，桩筏的承载力会降低30％。验证了模型预测与实验结果的良好一致性。桩头上方的垫层压缩的实验值和分析值之间的差异在可接受的范围内。最小承载力增加和不连接桩筏到非桩筏沉降的减少分别为42％和38％。此外，增加垫层厚度会增加桩头高度处的差异沉降，对于给定数量和长度的桩，桩筏的承载力会降低30％。验证了模型预测与实验结果的良好一致性。桩头上方的垫层压缩的实验值和分析值之间的差异在可接受的范围内。最小承载力增加和不连接桩筏到非桩筏沉降的减少分别为42％和38％。此外，增加垫层厚度会增加桩头高度处的差异沉降，对于给定数量和长度的桩，桩筏的承载力会降低30％。验证了模型预测与实验结果的良好一致性。桩头上方的垫层压缩的实验值和分析值之间的差异在可接受的范围内。验证了模型预测与实验结果的良好一致性。桩头上方的垫层压缩的实验值和分析值之间的差异在可接受的范围内。验证了模型预测与实验结果的良好一致性。桩头上方的垫层压缩的实验值和分析值之间的差异在可接受的范围内。