长短桩复合地基的理论与实践

Theory and Practice of Long-short-piles Composite Foundation

长短桩复合地基可以充分发挥地基土的潜能,有效提高地基承载力和减少地基沉降。长短桩复合地基的形成条件是确保长桩、短桩和桩间土在建筑物工作阶段能同时直接承担荷载;长短桩复合地基特别适用于压缩土层较厚的地基。长短桩复合地基承载力特征值fspk可采用下式计算:fspk=m1ARap11+β1m2RApa22+β2(1-m1-m2)fsk。提出了长短桩复合地基总沉降量的计算方法和优化设计的方法。最后给出了长短桩复合地基的一个应用实例。

It is discussed that the forming condition, forms and application range of long-short-piles composite foundation. In the same time, the calculations of bearing capacity and settlement, as well as the design optimization have been expounded. In the end, a practical application example is given.