基桩静载检测不等速维持荷载法研究

Study on Unequal Speed Load Maintenance Method of Foundation Pile Static Test

【目的】针对基桩静载检测慢速维持荷载法检测周期长、快速维持荷载法承载力判断缺乏量化依据的缺陷,提出了不等速维持荷载法。【方法】该方法前九级加荷采用快速维持荷载法的判稳标准,最后一级采用慢速维持荷载法的判稳标准,既可以保证检测效率,又兼顾了承载力判定的准确性。【结果】通过现场数十组不同加载方法的足尺静载对比试验,分别从承载力判定、沉降量测读、最后一级荷载维荷时间等方面与慢速法和快速法进行了对比分析。不等速维持荷载法检测效率比慢速维持荷载法更高,接近快速法;检测精度比快速维持荷载法更好,接近慢速法。【结论】本研究编制了自动加载的程序,实现了自动加载,可以作为桩基静载检测的推荐加载方法。

[Purposes] In view of the detects of the static load detection period of the slow speed load maintenance method of the foundation pile,the unequal speed load maintenance method is put forward.[Methods] The first nine levels of the method adopt the stability standard of fast load maintenance method,and the last level of slow load maintenance method,which can not only ensure the detection efficiency,but also take into account the accuracy of bearing capacity determination.[Findings] Through the static load comparison test of dozens of groups of different loading methods,the slow load method and fast method from the measurement of bearing capacity,settlement measurement and the load dimension time of the last stage were analyzed.The detection efficiency of the unequal speed load maintenance method is higher than the slow load maintenance method,and the detection accuracy is better than the slow load maintenance method.[Conclusions] The program of automatic loading is compiled to realize the automatic loading,which can be used as a recommended loading method for the static load detection of pile foundation.