Load Sharing mechanism of Piled-Raft-Foundations

在实践中，深基础是由一组桩连接在一起的混凝土筏。 筏板的作用是将柱荷载均匀地传递给桩。然而， 与桩共同承担建筑物的荷载。而工程技术人员往往单独设计筏板基础， 整个建筑的负荷。因此，桩基设计受到高度重视 保守，实际上不经济。 桩筏基础的概念已越来越多地得到周围的认可 世界虽然工程师认识到筏板对基础荷载的贡献， 这个领域一直落后于估算筏份额。这是因为， 桩/土/筏的性质复杂，实地测试即使在最好的情况下也是困难的。 在文献中，可以找到几个报告处理的荷载-沉降关系， 桩筏基础然而，这些报告是基于有限的模型，未能 认识一些重要控制参数和三维应力变形的影响 机制，这发生在桩筏基础内。 在本建议中，将对桩筏基础进行试验和数值研究， 执行。本文将发展一个三维数值模型来模拟桩筏的情况 将在原型实验装置上进行基础和实验室测试。后 用实验结果和数据验证了数值模型， 文献中，该模型将用于检查参数，认为管理的性能 这个基金会。 本文的研究成果将对桩筏基础的建设产生重大的经济影响 高层建筑的基础，而不影响安全。预计， 设计理论，指导方针和建议将被纳入加拿大 基础工程手册和美国土木工程师协会实践手册。 同样重要的是要注意到，该项目将为高素质人员和科学家提供培训。

In practice, deep foundations are made of a set of piles connected together with a concrete raft. The role of the raft is to transfer the column load to the piles uniformly. It does not however share the building load with the piles. While engineers often design raft foundation alone to carry the entire building load. Accordingly the design of pile foundations is regarded as highly conservative, in fact uneconomical. The concept of Piled-Raft-Foundation has been increasingly receiving recognition around the world. While engineers recognize the contribution of the raft to the foundation loads, research in this field has been lagging to estimate the raft share. This is due to the fact that interaction among the piles/soil/raft is complex in nature and field testing is difficult at best. In the literature, several reports can be found dealing with the load-settlement relationship of piled-raft foundations. Nevertheless, these reports are based on limited modeling, and failed to recognize the effect of some vital governing parameters and the three-dimensional stressdeformation mechanism, which take place within the piled-raft foundation. In this proposal; experimental and numerical investigations on piles-raft foundation will be performed. A three-dimensional numerical model will be developed to simulate the case of piled-raft foundation and laboratory tests will be conducted on prototype experimental set-up. After validating the numerical model with the experimental results and the data available in the literature, the model will be used examine the parameters, believed to govern the performance of this foundation. The results of this study will have significant economic impact on the construction of piled-raft foundations for high-rise buildings without compromising on the safety. It is expecting that the design theories, guidelines and recommendations developed will be incorporated in the Canadian Foundation Engineering manual and American Society of Civil Engineers manual of practice. It is equally important to take note that this project will provide training to the Highly Qualified Personnel and scientists.