目前p-y曲线法多数用于研究桩周土体未开挖情况下横向推力桩的变形性状,很少应用于计算基坑围护结构的变形。p-y曲线法考虑了土体的非线性位移,符合基坑内侧土体受围护结构挤压变形的实际状态。因此,以具体工程为例,用p-y曲线法计算基坑围护结构的位移,并与目前常用的弹性地基梁增量法计算值及实测值进行比较,以验证其合理性和优越性。研究表明:采用 p-y曲线法计算出的基坑围护结构侧向位移曲线与实测位移曲线相比,除了形态相似、符合基坑围护结构实际变形规律外,数值上也比弹性地基梁增量法的计算结果更加接近实测值。理论与实践均表明,采用p-y曲线法计算基坑围护结构位移是合理的。
Abstract
In current researches, p-y curve is widely used to study the deformation properties of lateral thrust piles when surrounding soils are unexcavated, but is rarely applied to calculate the deformation of the ditch enclosure structure of deep foundation. With the nonlinear displacement of soil into consideration, the method of p-y curve is in accordance with the actual state of the inner soil which is compacted by the foundation ditch enclosure structure. In view of this, the displacement of the ditch enclosure structure of a practical engineering project was calculated by using p-y curve method, and was compared with measured result and the calculation result of the incremental analysis method for beam on elastic foundation to verify its rationality and superiority. Results unveiled that the lateral displacement calculated by p-y curve method is closer to measured displacement than the result calculated by the incremental analysis method for beam on elastic foundation. In addition, the displacement curve obtained by p-y curve method is in line with the actual deformation law of the ditch enclosure structure of deep foundation. Both theory and practice have proved that p-y curve method is rational in calculating the displacement of the ditch enclosure structure of deep foundation.
关键词
基坑 /
围护结构 /
p-y曲线 /
位移 /
弹性地基梁增量法
Key words
foundation pit /
support structure /
p-y curve /
displacement /
incremental analysis method for beam on elastic foundation
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