地震勘探技术在防渗墙无损检测中的应用探究

Application of seismic prospecting technique in non-destructive detection of cut-off wall

防渗墙属地下隐蔽工程,人为因素影响、施工材料及工艺的不确定性均可造成防渗墙质量缺陷。为探测防渗墙质量缺陷的分布范围及具体位置,查明墙底入岩情况,根据地质勘察资料及墙体施工工艺,通过高密度地震映像法结合瞬态瑞雷面波法对墙体质量进行探测,应用Geo COD及GeoRwa反演软件辅助分析,最后与钻孔取芯检测成果进行对照,证实了地震勘探技术在防渗墙无损检测中的适用性。实践表明:地震勘探技术可在快速、无损、经济的探测基础上,进一步探明防渗墙整体范围内可能的缺陷位置和分布情况,为堤防工程除险加固提供一定的技术支撑。

As one kind of underground works,many factors of cut- off walls like human causes and material / technique differences may lead to construction defects. In order to detect the location and distribution of the defects and identify whether the wall bottom has been embedded into the foundation rock,high- density seismic imaging method and transient Rayleigh wave method are used considering the in- situ geological information and construction technique. The inversion software Geo COD and GeoRwa are combined to make analytical interpretation and the results are cross- checked with core- drilling results,confirming that this seismic survey approach is applicable to cut- off walls detection. In view of the heavy labor involved in cut- off wall quality testing,the practice proves that the seismic survey technology can thoroughly locate the possible distribution range of the defects in an effective,fast,non- destructive and economical way,which can provide technical support for risk elimination and reinforcement of embankment.