中文摘要：

由于附加质量法具有方便,无损等优点,近年来在堆石体密度的检测中已经有了较为广泛的应用,但是目前对于该方法的研究仍不够深入,而且常用的附加质量法测试过程仍然有一定缺陷,需要进一步改进.本文以在糯扎渡水电站进行的一系列实验为基础,对附加质量法检测堆石体密度中存在的一些问题进行了研究并提出了改进建议,主要包括：1）通过公式推导和实验发现,当附加质量的级数较小时,主频提取的误差会对刚度的测试结果造成较大的影响,建议将附加质量的级数由常见的5级增加到10级以上;2）通过对实验数据的分析发现目前的主频数据确定方法包含较强的主观因素,容易造成较大的误差,而采用t检验准则剔除异常数据并求取算术平均值的主频统计确定方案更为合理;3）利用实验研究了测试参数及质量块旁边放置重物对主频提取的影响情况,发现偏移距和震源高度及质量块旁边放置重物对主频的数值都有一定的影响,而且震源高度较高,偏移距较小时主频提取的稳定性较高.因此建议测试过程中应保证震源参数不变,偏移距取20cm,震源高度取60cm.并且在距离质量块1m以内的区域内应尽量避免放置重物,尤其是尽量避免放置重量接近或超过质量块的重物.本文的研究结果有助于提高附加质量法在测定堆石体密度时的准确性.

英文摘要：

Additive mass method is convenient and nondestructive. So it is widely used in the density measurement of rock fill objects. However, the research of the method is still not completed, and the process of this method still has some limitations. In this paper, based on a series of experiments in Nuozhadu hydropower station, we conducted a study on some questions of this method, and gave some suggestions. The mean contents are as follows： 1） From the deductions and experiments, we found that when the number of additive mass is small, the error of frequencies can affect the measurement rigidity very much. So we suggest to enlarge the number of additive mass from 5 to more than 10; 2） We found from the experimental data that the former method to determine the frequency is too subjective, and is likely to cause large errors. The method to eliminate singular data with t test and compute the arithmetic means is more reasonable; 3） The effect of the test parameters and the weights near the additive mass on the stability of the frequency measurement is studied with experimental data. It is found that the offset, the hammer height and the weights near the additive mass can attect me Irequency, a -1 stable when the hammer is higher and the offset is shorter. So we suggest to keep the test parameters unchanged during the test, and to adopt the hammer height of 60cm and the offset of 20cm. Moreover, we suggest to avoiding putting weights near the additive mass, especially those heavier than the additive mass. The study of this paper is meaningful to enhance the accuracy of the density measurement of rock fill object by additive mass method.