为探讨瞬态瑞雷面波法用于铁路岩溶路基注浆质量检测的有效性,根据现场典型的地质断面特征,分别建立了无溶洞发育的两层介质起伏界面模型和有溶洞发育的两层介质起伏界面溶洞模型.通过改变数值模型中局部介质的物性模拟岩溶路基注浆前后的变化.用瞬态激振力模拟现场锤击振动,对比分析注浆前后地表检测点频散曲线的变化特征.研究结果表明:无溶洞发育时,注浆后频散曲线主要以波速提高为主；有溶洞发育时,注浆后频散曲线不仅波速提高,而且注浆前频散曲线的“之”字形扭曲现象消失,与现场检测结果基本一致.%To investigate the effectiveness of the application of the transient Rayleigh wave method to the quality detection of grouting in karst roadbed, two numerical models were built from the characters of typical geology sections in the field. They are respectively for underground strata with or without karst cave, and the property of partial media in the models may be changed to simulate the variation of karst roadbed before and after grouting. The transient impact force was used to simulate hammer hitting vibration on the ground, and dispersion curves for ground test points in the two numerical models were analyzed comparatively. The research result shows that under the condition without karst cave, grouting leads to the wave velocity of dispersion curve to increase, while under the condition with karst cave, grouting makes the wave velocity of dispersion curve raise and the zigzag distortion of the dispersion curve before grouting disappear to indicate the same result as the field test.
展开▼
