桩台网复合地基加固区沉降研究

Study on Settlement of Pile-Cap-Net Composite Foundation in Stabilization Area

目前,桩台网复合地基沉降计算所需桩土荷载比主要靠经验或试验确定。通过假定桩台间网下凹变形为抛物状、大小等于桩间土下沉量减去桩的下沉量,引入Jones经验公式,推导出桩顶、桩间土荷载和桩土荷载比计算公式,采用试算法确定地基沉降。试验对比表明,计算公式具有一定的可靠性。

At present,pressure ratio of pile and soil of pile-cap-net composite foundation used in settlement calculation is determined primary by experience and test.Supposed that deformation curve of net between caps is parabola and sinkage equals to settlement of soil between caps minus compression of piles.By the introduction of experiential formula presented by Jones,pressure of cap and soil surface between caps can be calculated,and pressure ratio of pile and soil between caps can also be calculated.Settlement of foundation can be obtained by trial calculation.The reliability of formula above is proved by test.