Use of seismoacoustic methods to assess the results of cement stabilization (grouting) of rock foundations

Abstract

1. Work in various lithological-structural conditions has confirmed the effectiveness of seismic sounding for detailed regionalization and assessment of the effect of grouting on the elastic properties and structures of large volumes of ledge rock in the foundations of hydraulic structures. 2. The effect of cement grouting is manifest in leveling out of the elastic characteristics of the rocks, expressed as an increase in the values of vp in the low-velocity zones and a decrease in the dispersions of the mean velocity values. 3. In detailed seismoacoustic investigations aimed at estimating the effect of grouting it is advisable to regard jointed ledge rock as a statistically inhomogeneous medium and to represent its elastic properties and the effect of grouting by means of the principal statistics of the distribution of the elastic properties. 4. The use of geophysical investigations in the performance of grouting enables us to reduce the planned volume of grouting operations by detailed investigation of the structure of the rocks, and to dispense with grouting in blocks which are found to be high-velocity when the planned requirements are attained after the first stages of grouting.