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本文在论证了径压法测定冻土抗拉强度具有良好规律的基础上,进一步探讨试样长度对测定结果的影响问题以及计算方法的修正问题。长度为25-130mm的7种试样在不同温度和机速下的试验结果表明,试样长度对径向压裂法的测定结果无实质的影响。在通常范围内,试样的长径比问题可以不予考虑。在同样温度和机速下,径向压裂法的测定值比直接拉伸法的抗拉强度小得多;但在不同温度和机速下,两种结果的比例相当接近,可用统一比例系数K对径压法强度进行修正,使之符合直拉法指标,达到可比要求,供实际应用。
Based on the demonstration of the good law of the tensile strength of frozen soil by the radial pressure method, this paper further discusses the influence of the sample length on the determination results and the correction of the calculation method. The test results of seven kinds of samples with length of 25-130mm at different temperatures and machine speeds show that the length of the sample has no substantial effect on the results of radial fracturing. In the usual range, the aspect ratio of the sample can not be considered. At the same temperature and machine speed, the measured value of the radial fracturing method is much less than the tensile strength of the direct drawing method. However, at different temperatures and machine speeds, the proportions of the two results are quite close, K Correct the strength of the radial pressure method so that it meets the Czochralski method and achieves comparable requirements for practical applications.