超声波及表面波法在检测含水裂缝深度中的应用分析

Application Analysis of Ultrasonic Wave and Surface Wave for Water-filled Crack Depth Detection

介绍了基于单面平测法、双面斜测法、钻孔对测法及表面波法的混凝土裂缝深度测量原理,结合工程实例,对比分析了单面平测法及表面波法检测含水裂缝和干燥裂缝深度的结果。当裂缝干燥、表面及内部仅有少量或者无粉尘等杂质填充时,单面平测法及表面波法检测结果较为接近,均与钻孔直接测量结果一致;当裂缝内有大量泥水及杂物时,仅表面波法测得结果与钻孔直接测量结果吻合。分析表明,单面平测法受裂缝中水及填充物影响较大,而表面波法受其影响较小,建议对于类似大坝混凝土等近似半无限平面体裂缝的测量优先选用表面波法,对于干燥裂缝视具体情况而定。

The measuring principle of concrete crack depth based on single plane detecting,double oblique method,drilling method and surface wave method are introduced,and combined with the engineering example,the depth results of water-filled crack and dry crack detected by single plane detecting method are compared with those by surface wave method.When the crack dry and the surface and internal of crack is filled with little or no dust and other impurities,the results of single plane detecting and surface wave method are closed to each other,and both of the results are similar to the direct measured depth of drilling; When the crack is filled with lots of mud water and impurities,only the result of surface wave method is similar to the true depth. The analysis shows that single plane method is greatly affected by water and infills,while there is little influence on surface wave method. Therefore it is suggested that surface wave method is the first choice for dam concrete and other similar semi infinite plane crack,and it depends on the specific circumstances for dry crack.