黄河大堤防渗墙质量无损检测方法研究

Study on nondestructive detection method for diaphragm wall of Yellow River dike

黄河大堤防渗墙质量无损检测尽管有多种方法,但由于防渗墙结构的特殊性,已有方法还不能准确地确定其中有无损伤.为此,采用一种基于振动理论的防渗墙结构无损检测方法(该方法主要利用结构模态参数的变化来判断防渗墙有无损伤),将现场测试和数值模拟相结合,研究了防渗墙在不同损伤情况下的动力特性及其变化规律.结果表明,这种方法对于防渗墙质量的检测是行之有效的,且可检测的灵敏度随损伤类型而变化.

Owing to the special structure of the diaphragm wall of the Yellow River dike, there is still not an accurate method for nondestructive detection of quality defects of the diaphragm wall. In this paper, a vibration theory-based method was presented for nondestructive detection of the structure of the diaphragm wall. In this method, the damages of the diaphragm wall were determined mainly according to the variation of modal parameters, and the dynamic characteristics of the diaphragm wall and their variation were studied by combination of the field test with numerical simulation. The result shows that the method is effective for detection of diaphragm walls, and that the sensitivity of detection varies with the type of damages.