Study On Affecting Factors Of Evaluating Karst Rodabed Grouting By Transient Tayleigh Wave

The density and bearing capacity of rock will be improved by karst roadbed grouting reinforcement. The grouting method can also reduce groundwater penetration. The appropriate test methods should be choosed to evaluate whether the groutiong effect comply with the requirements. Transient Rayleigh Wave method has been widely used in the Grouting effect detection. However, due to engineering geological conditongs, the detection accuracy will be affected to some degree. Analysis of factors and evaluation of these factors have important engineering significances. And the findings of the study are as follows:(1) Analysis of Rayleigh wave propagation characteristics of Guizhou and Yunnan specific word site of Shanghai-Kunming, the Rayleigh wave velocity under different depths can be obtained. Comparation of the velocity of the "special railway roadbed design" standard, the result shows that there are different errors under different geological conditions.(2) Using the numerical simulation method calculate the effection of karst roadbed grouting by Transient Rayleigh Wave. Using numerical simulation software FLAC3D calculates the detection effect of different cover layer thickness, based cladding interface and strata dip. The results show that, the accuracy of detection is accurate when the cover layer thickness from 0 to 5 metre. There is an error detection result when the cover layer thickness from5 to 10 metre. However, Transient Rayleigh Wave can’t be used when the the cover layer thickness more than 10 metre; The different cladding interfaces have different effects on the detect results. When the shape is irregular or the inclination angle of less than 30°, the detection error is small, and when the angle exceeds 30°, the error detection results will increase with the angle increases; The error detection also will increase with the angel of strata dip increases.(3) Acorrding at a large number of the detection of Guizhou and Yunnan of Shanghai-Kunming, can include that the effection of the detection resulet will be different under different geological conditions. Establish a multi-level fuzzy comprehensive evaluation system, we can get Transient Rayleigh Wave Method detect karst roadbed evaluation system by varying degrees of influence quantify.