分布式光纤传感技术在超长PHC管桩竖向承载试验中的应用

Application of Distributed Fiber Optic Sensing Technique in Vertical Bearing Test of Super-Long PHC Pipe Pile

为了能够精确得到超长PHC管桩竖向承载试验中承载力及侧摩阻力的分布规律,通过静载试验方法对PHC管桩进行承载力测试。采用分布式光纤传感技术,得到荷载-位移曲线及侧摩阻力随入土深度的分布曲线,进而得到不同土质侧摩阻力推荐值,并与规范取值进行对比。此研究验证分布式光纤传感技术在桩基静载试验中的可行性。

To obtain the vertical bearing capacity and the distribution of lateral friction resistance of super-long PHC pipe pile in the vertical bearing test accurately, the static load test is applied to test the bearing capacity of PHC pipe pile. The load-displacement curves, lateral friction resistance-penetration depth curves and the recommended values of lateral friction resistance in different soil are obtained by the distributed fiber optic sending technique. The recommended values of lateral friction resistance are compared with those of the standards. This research verifies the feasibility of distributed fiber optic sensing technique in the static pile foundation test.