刚性群桩的非线性分析 English Version
Nonlinear Analysis of Rigid Group Piles
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摘要: 本文延伸单桩之非线性Ｔ－Ｚ曲线理论，应用于刚性群桩工程。桩－土－桩互制作用影响，导致桩身沉降量增加。进而导得刚性群桩之非线性Ｔ－Ｚ曲线理论，以分析群桩在垂直荷重下之荷重。位移关系。研究结论是桩－土－桩之间的互制作用使群桩之刚度降低，却提高极限荷重，即在同一荷重作用下，群桩比使用具有一大断面积之单桩为安全。一般而言，非线性Ｔ－Ｚ曲线分析得到之预测值比观测值保守。值得注意的是所用破坏比Ｒ＿ｆ增加０．１５时，极限荷重约减少５％。实例分析采用Ｋｒａｆｔｅｔａｌ．建议值０．９。对不同土Ｒ＿ｆ值应进一步讨论。Abstract: In this paper is extended the nonlinear T-Z Curve of single pile,to rigid group piles. The nonlinear T-Z curve of rigid group piles is derived from the increasing settlement of the pile shaft induced by the interaction ofpile-soil-pile system. Conclusions are:①The interaction of pile-soil-pile system obviously reduces the pilestiffness. However,it raises the ultimate bearing capacity of rigid group piles,This means that the usage of rigidgroup piles is more safe than that of a single pile,which has a big cross-sectional area.②Generally speakillg,the predicted results from the nonlinear T-Z curves in much more conservative than the observed one.③It is worthwhile to point out that the failue ratio Rf used influenced the prediction,The ultimate bearing capacity of group pilesis decresaed by 5% when the Rf is increased by 0.05.In this investigation,Rf=0.9 is used as suggested by Kraft et al.,while Rf for other soil condition needs further discussion.
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Keywords:
- interaction /
- pile-soil-pile system /
- failure ratio /
- ultimate bearing capacity. /
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