大直径灌注桩的应力应变测试研究

RESEARCH ON STRESS AND STRAIN TEST OF BIG DIAMETER DRIVEN CAST-IN-PLACE PILE

桩身应力应变测试是从微观上了解桩基工作性状的基本方法.某工程大直径灌注桩采用静压试桩,通过考察应力应变测试结果,即试桩的Q-S曲线、桩身轴力曲线、单位摩阻应力曲线、单位摩阻应力随加载量变化的曲线,从微观上了解桩基工作性状,给出一些结论,供同类型工程设计和施工参考.

It is the basic method of understanding the performance behavior of big diameter driven cast-in-place pile by the test of stress and strain. Based on an actual case with the method of static test, and by analyzing the pile＇s curve of Q - S, curve of axial force, curve of unit frictional resistance stress and the variable curve of the frictional resistance stress followed with time, the authors got some useful conclusion which can be help in the design and construction of the similar engineering.