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根据灌注桩规范要求,工程中应抽1%的桩数进行试桩,按照过去静载荷试验的办法,试验周期长,荷重大,工作繁重,花钱多,很多工程难以办到。因此、多数桩基工程只好根据土工试验资料、凭经验公式来估算桩的承载力,为安全起见,一般单桩承载力取值均偏低。即使有的工程做了静载试桩,但由于场地土质的不均匀性和施工工艺的差异,也不能反映整个桩基工程的均质情况。因此、迫切需要寻找一种快速简便、经济、有效的测试手段。近几年来,国内、外在桩基试验中,应用各种动测方法来研究桩基的性状,如用锤击贯入法确定单桩轴向承载力,稳态扫频激
According to the specification of cast-in-place piles, 1% of the number of piles should be tested for the test piles. According to the past static load test methods, the test period is long, the load is heavy, the work is heavy and the money is expensive. Many projects are difficult to do. Therefore, most pile foundation projects can only estimate the bearing capacity of piles according to the empirical data obtained from the geotechnical test data. For the sake of safety, the values of bearing capacity of single piles are generally low. Even if some projects do static load test piles, due to the unevenness of site soil quality and construction process differences, it cannot reflect the homogeneity of the entire pile foundation project. Therefore, there is an urgent need to find a quick, simple, economical and effective test method. In recent years, in domestic and external pile foundation tests, various dynamic test methods have been used to study the properties of pile foundations. For example, hammer pile penetration method is used to determine the axial load capacity of single piles.