STATISTICAL ANALYSIS AND RESEARCH ON WAVE VELOCITY OF THE TERTIARY SANDSTONE

Wave velocity testing technology has been widely used in various engineering as a simple, quick test technology, and the Tertiary sandstone is one of the very representative soft rocks, so it has very important implications to research on Wave velocity testing of the Tertiary sandstone. This paper took the Tertiary sandstone in Jiyang nuclear power plant as an example, analysed the spatial distribution of the semi-formed Rock's wave velocity and searched the relationship of the wave velocity with depth, SPT and CPT though organizing the data of the wave velocity gain by cross-hole wave velocity measurement and single-hole wave velocity measurement. The results shows that the wave velocity increases with depth, above the depth of 5m, the rate of increase is very significantly, and the increase rate trend slow below the depth of 5m. The wave velocity for different holes are basically the same, which indicate that the Tertiary semi-formed sandstone is uniformitarian. Shear wave velocity and depth of buried linear regression fit well; there is no significant correlation between the shear wave velocity and SPT, and the shear wave velocity and CPT are uncorrelated.