关键词: 磁测井法, 钢筋笼长度, 灌注桩, 准确性；可推广性

Abstract: The magnetic logging is a common method for measuring the length of steel reinforcement cage of the cast-in-place piles. The detection principle is to analyze the magnetic anomaly curve around the pile based on the distribution characteristics of the magnetic field around the pile to estimate the length of the entire steel reinforcement cage. The detection curve of the steel reinforcement cage with a good integrity is uniform and stable, and there will be reflected signals when passing through the pile bottom. Therefore, the detection method can provide an important basis for the identification of the abnormality of the steel reinforcement cage at the suspected pile length or pile end. By introducing the basic working principle of the magnetic logging method and measuring the integrity of the underground steel reinforcement cage, and combining with a new construction project in Suzhou, the magnetic anomaly curve of the steel reinforcement cage of the cast-in pile was analyzed. The test results confirmed the feasibility and accuracy of using the magnetic logging method in measuring the length of the steel reinforcement cage of the cast-in place pile, as well as its feasibility in the field of engineering testing and quality assurance.

Key words: Magnetic Logging Method, Steel Reinforcement Cage Length, Cast-in-Place Pile, Accuracy, Applications