摘要
基于瑞雷波在层状介质中的传播理论,可以对地表实测瑞雷波进行频散分析,从而对地下岩土介质的物性差异给予判断分析。这种方法在岩土工程勘察检测领域得到了越来越多的应用。本文将两道瑞雷波应用于路基压实度检测问题。利用Matlab软件中的绝对相位展开技术,提取了两道瑞雷波之间的相位差信息,进而提取频散曲线。再根据半波长理论以及瑞雷波相速度与路基土的干密度关系,给出了干密度随深度变化的曲线,最后将多个测点的干密度曲线排列在一起,为检测路基的压实程度提供了很好的参照。另外,基于Matlab和Vc++开发了一套界面友好的两道瑞雷波路基密实度检测软件。本文的研究说明两道瑞雷波法用于检测路基压实度是行之有效的。
On the basis of the theory of Rayleigh Wave propagation in layer medium, frequency dispersion analysis is carried on to the earth＇s surface Rayleigh Wave that measured actually, thus judgment analysis to the underground rock soil＇s differences of the quality is given. This kind of method gets more and more functions in the rock soil engineering investigation and examination field. Two channal Rayleigh Waves are applied to the examination problems for degree of compaction of subgrade. Using the absolutely phase unwrapping technique of Matlab software, the phase shift information between two channal Rayleigh Wave is withdrawn, then the frequency dispersion curve is withdrawn. And basis half wave-length theories and the relation between phase velocity of Rayleigh Wave and the dry density of the subgrade, the dry density curve with the depth change is given. Last, making all dry density curves to arrange together, a good reference is provided to examine the degree of compaction of subgrade. Moreover, based on Matlab and Vc＋＋, a set of examination software for interface friendly of two channal Rayleigh Wave＇s degree of compaction of subgrade is developed. The research results show that making two channal Rayleigh Wave method to extrapolate the degree of compaction of subgrade is effective.
出处
《公路》
北大核心
2007年第7期145-148,共4页
Highway
基金
国家自然科学基金项目(40604012)
关键词
瑞雷波
压实度
频散曲线
绝对相位展开
Rayleigh Wave
degree of compaction
curve of frequency dispersion
absolute phase unwrapping
