中粗粒土路基压实度快速测定方法

利用瞬态冲击频谱分析法,研究冲击响应值与不同碎石质量分数的压实度关系以及碎石级配的变化对冲击值的影响。通过水滞频段的应用,消除了含水量对响应值的影响,可以在不检测含水量的情况下测定中粗粒土的压实度,在此基础上确定了动态冲击响应值与中粗粒土的压实度关系。结合中粗粒土的现场工艺特点,对冲击响应影响深度进行评估分析,提出了中粗粒土路基压实度的快速测定方法,并研制了仪器,实现了对中粗粒土路基压实度快速、无损、定量的自动检测。

Compactness Rapid Measurement Method on Middle Coarse Grained Soil Subgrade

Authors studied the relationship between impact response value and compactness of different kinds of gravel content as well as influence of the change of gravel gradation on impact value by means of instantaneous impact frequency spectrum analysis method.By using water-retardation frequency portion,influence of water content on impact response value was avoided and compactness of coarse grained soil was measured without considering water content.Authors got the relationship between dynamic impact response value and compactness middle coarse grained soil subgrade.With consideration of technological characteristics for middle coarse grained soil and evaluation of influence depth of impact response,compactness rapid measurement method on middle coarse grained soil subgrade was provided and an instrument was designed which could quantitatively measure compactness quickly without destroying subgrade.