Discussion on the application of magnetic logging method to detect steel reinforcement cage in loess site
As an effective method for nondestructive testing of reinforcement cage length,the applicability of magnetic logging method in loess site has not been verified.In this paper,the principle of magnetic logging method is analyzed to get a method to judge the length of reinforcement cage,and combined with engineering examples to detect the reinforcement cage of cast-in piles in loess area,it is found that the characteristic points of the curve are not obvious.Further,the vertical component of magnetic field intensity in loess-paleosol layer is detected and analyzed.Different detection methods,pile-hole distance and detection speed are used to detect the length of reinforced cage of cast-in-place piles.The results indicate that the unclear characteristic points of the curve are mainly affected by the interlayer of loess paleosol and the strong magnetic properties of paleosol in the loess site.In order to overcome this influence,the actual length of the reinforcement cage should be measured by the magnetic logging method in the loess site,the magnetic sensor should be detected from bottom to top,the pile-hole distance should not be more than 0.7 m,and the detection speed of the magnetic sensor should not be more than 300 mm/s.
reinforcement cage lengthmagnetic logging methodloess sitevertical component of magnetic field
万方数据
维普
