超长桩桩身变形量的计算方法研究

Calculation Methods for Super-long Pile's Compression

超长桩基础的沉降量主要由桩身变形量和桩端以下土层压缩沉降量组成.桩身变形量可分为由桩身自重引起的变形量和由上部荷载引起的变形量.对桩身变形量的计算,国内外规范和一些学者给出了不同的计算方法.这些计算方法大致可归纳为综合系数法、分层总和法、弹性理论法.研究表明,在计算超长桩的沉降中,桩身变形量已经不可忽略,而由桩身自重引起的桩身压缩量也应予以考虑.

The settlement of super-long pile foundation is mainly made up of pile＇s compression and settlement of soil layers under pile end.Pile＇s compression is caused by the pile＇s own weight and external forces.In order to calculate pile＇s compression,domestic and abroad codes and some researchers propose different methods.The calculation method can be roughly classified into comprehensive coefficient method,section summation method,and elastic theory method.The results show that settlement of super-long pile should calculate pile＇ s elastic compression,and also the amount of compression caused by pile＇s own weight cannot be neglected.