瑞利波法检验客运专线湿陷性黄土地基处理效果

THE EFFECT OF THE APPLICATION OF THE RAYLEIGH WAVE METHOD TO TESTING COLLAPSIBLE LOESS GROUND ALONG THE SPECIAL PASSENGER TRANSPORTATION LINE

黄土地基具有明显的湿陷性,试验采用3种方法(柱锤冲扩桩、挤密桩、强夯)进行处理。测试得到地基在3种方案处理前后的瞬态瑞利波频散曲线,比较处理前后的瑞利波波速分布图,反演分析地基剪切波速度,得到黄土地基处理后的波速变化特性。结果表明,经3种方案处理后的黄土地基弹性波波速均得到了提高,波速增大幅度从大到小分别为柱锤冲扩桩、挤密桩和强夯,与静力触探法对比结果较为一致,表明瞬态瑞利波测试方法能大面积无损测试地基处理效果。

Loess ground has obvious collapsible characteristic. Three methods, namely DDC-pile, compaction pile and dynamic consolidation, were adopted in this test. The Rayleigh dispersion curves of three methods were tested before and after the treatment, the Rayleigh velocities were compared, the shear wave velocity was inversed, and then the wave velocity variation of the loess ground was obtained. The results indicate that all the elastic wave velocities are increased, the increasing amplitude of the three methods are in order of DDC-pile, compaction pile and dynamic consolidation. The transient Rayleigh wave method was applied to non-destructive test so as to get to know the result of large area ground treatment.