Based on the theory of mfl and a study on the signal characteristics ofac - mfl and ect : on one hand , it expouded the flaw identification model of �� slope ratio �� todetect the defects in panel , rob or pipeline ; on the other hand , the flaw - depth measurementmethod based on the characteristical frequency were used in ac - mfl . the application ofac - mfl was realized , and it showed the accordance of defect detection for these twotechniques
2.
With synthesize slope ratio increasing , the stability of cutting slopes decreases , but the stability of sharpen slope affected by natural slopes ratio changes rarely , the stability of cutting slope that height is 30m is change notably due to slope type , whose single slope ratio with madao is inferior to the slope that upper ratio is less than lower ratio with platform in middle part . but the stability of cutting slope with 50m height is little change with the slope type change . with same stratum , slope height , slope type , the cutting slope is inferior to the sharpen slope in stability
3.
Based on the research of influencing factors and regularities of distribution of loess side slope stability in northwest , the author select pingshuo antaibao southern spoil bank as subject investigated , and abstract several the most rudimental influencing factors which are ubiquitous concerning slope stability in loess area such as sloping shape , slope ratio , bulk density , cohesive force , angle of internal friction , elastic modulus , poisson ratio , water immersion
4.
In this article , the characteristics of detectedflaw - signal and the principle of flaw identification and its implementation were established onthe basis of the electromagnetic theory by means of simulation , and were experimentally provedat large . the main research and technical innovation concerned on the following lists : based on the thorough research on the theory of eddy current testing ( ect ) depended onmagnetic field measurement and in order to improve the velocity and reliability of defectdetection , flaw - identification models of �� flaw - loop �� and �� slope ratio �� and their algorithm forreal - time implementation were established to realize the believable flaw - identification ofdifferent kinds of flaws and their precise flaw - length measurement
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