2014 Volume 70 Issue 4 Pages 328-339
The high-pressure injection mixing method is extensively used to improve the ground to have a high seismic stability, including the prevention works of soil liquefaction. The uniformity of the strength and stiffness of cement-mixed grounds improved by this technology is relatively low. Based on a comprehensive series of studies in the laboratory and in the field, it is proposed to evaluate the unconfined compression strength qu in such grounds rapidly and continuously from field shear wave velocities Vs measured based on the relationship between Vs and qu obtained by using specimens prepared in the laboratory under respective field ground improvement conditions. A typical case in which this method was applied is described.