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自平衡测试技术作为一种高效、先进的静载测试技术,在国内外逐步得到了认可和应用。本文概述了自平衡法的测试原理和方法,采用自平衡法和高应变测试法对实际工程锤击预应力管桩进行承载力试验,对比了两种方法试验得到的桩侧摩阻力、桩端阻力及单桩极限承载力,测试结果比较接近,可相互验证。试验表明荷载箱可以经受施工阶段的巨大锤击压力,自平衡测试方法可适用于预应力混凝土管桩的承载力检测。高应变法与自平衡法相比较,两者所得到的桩侧摩阻力的偏差比桩端阻力的偏差较高,表明自平衡法运用时确定桩侧负摩阻力的转换系数尤为重要,需要结合本地区的工程地质条件多进行比对试验,形成地区经验。
Self-balance testing technology as an efficient, advanced static load test technology, gradually recognized and applied at home and abroad. This paper summarizes the test principle and method of self-balancing method. The self-balance method and high strain test method are used to test the bearing capacity of practical engineering hammer prestressed pipe piles. The pile side friction resistance obtained by the two methods is compared. Resistance and ultimate bearing capacity of single pile, the test results are relatively close, mutual verification. The test shows that the load box can withstand the huge hammer pressure during the construction phase and the self-balance test method can be applied to the bearing capacity test of the prestressed concrete pipe pile. Compared with the self-balance method, the deviation between pile-side friction resistance and pile-side resistance obtained by the two methods is higher than that of the self-balance method, which indicates that the conversion coefficient of the pile-side negative friction force is very important when applying self-balancing method. Regional engineering geological conditions more than the test, the formation of regional experience.