基于模态分析的土石路基回弹模量评定方法

作者：侯明振¹，葛玉宁²，邓建营³，王春祥¹，姜益顺²，曹卫东⁴

作者简介：

侯明振，高级工程师，E-mail: h1036842320@163.com

作者单位：

1. 山东东方路桥建设有限公司, 山东临沂276000；2. 山东省路桥集团有限公司, 山东济南 250061； 3. 山东高速基础设施建设有限公司, 山东济南 250002；4. 山东大学齐鲁交通学院，山东济南 250002

摘要：

为探讨土石路基回弹模量的一种快速测定及评价方法，将压实的路基视为一个多自由度系统，基于试验模态分析理论，通过锤击法和承载板法分别进行了土石路基振动模态和回弹模量测试。采用Levy法识别得到路基的固有频率和阻尼比，建立了2个模态参数与路基回弹模量间的经验方程。结果表明，路基模态的1~3阶固有频率、1~3阶阻尼比与回弹模量相关性显著，表明可利用压实路基的模态参数实现路基回弹模量的快速评定。实际应用时，可先通过试验路段建立与选定路基模态参数和回弹模量相关性最强的回归方程，然后在正式路段上通过振动模态测试与方程即可得到回弹模量。

关键词：道路工程；土石路基；模态分析；固有频率；阻尼比；回弹模量

English：

In order to explore a rapid method for determining the resilient modulus of earth-rock subgrade, the compacted road subgrade was considered as a multi-degree-of-freedom system. Based on the experimental modal analysis theory, the vibration modal and resilient modulus tests of earth-rock subgrade were carried out using the hammering method and load-bearing plate method, respectively. Levy method was used to identify the natural frequency and damping ratio of the subgrade, and the empirical equations between the two modal parameters and the resilient modulus of the subgrade were established. The results show that the 1st to 3rd natural frequencies, the 1st to 3rd damping ratios of the subgrade correlate significantly with the resilient modulus, indicating that the modal parameters of the compacted subgrade can be used to achieve rapid assessment of the resilient modulus of the subgrade. In practice, the regression equation with the strongest relevance between the selected modal parameters of the subgrade and the resilient modulus can be established through trial section at construction site, and then the resilient modulus can be obtained through the vibration modal test and the equation on the normal section.

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