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以加拿大多伦多市某工程为例,介绍了在复杂地质条件下采用局部桩筏基础(PPRF)的设计及施工问题;探讨了设计PPRF的决定性因素;在保持PPRF设计的完整性前提下,提出了单位沉降量的准则,并用于筏板和桩的设计;计算了PPRF的滑移及转动;最后,采用有效方法对该工程采用的局部桩筏基础进行了计算分析。结果表明,PPRF的设计主要取决于侧向土压力、分布不均的建筑荷载以及地基土的非均匀承载力,工程桩应主要布置在沉降较大的区域,即位于筏板基础承受高压力而土体承载力较低的西北部。探讨局部桩筏基础的设计与施工为该类型工程的基础设计提供了一个新的解决途径。
Taking a project in Toronto, Canada as an example, the design and construction of partial pile raft foundation (PPRF) under complicated geological conditions are introduced. The decisive factors of PPRF design are discussed. On the premise of maintaining the integrity of PPRF design, Unit displacement, and used in the design of rafts and piles. The slip and rotation of PPRF were calculated. Finally, an effective method was used to calculate and analyze the local piled raft foundation used in this project. The results show that the design of PPRF mainly depends on the lateral earth pressure, unevenly distributed building load and non-uniform bearing capacity of foundation soil. The engineering piles should be mainly arranged in the large settlement area, that is, the raft foundation under high pressure Soil northwest lower bearing capacity. The discussion of the design and construction of the local piled raft foundation provides a new solution for the basic design of this type of project.