The experimental result and theoretical analysis show that there are three elastic body waves in saturated fine sand under dynamic load,i.

Research on information transmission methods of weak elastic wave;

A primary discussion about propagation process of elastic wave in B_4C matrix composite;

Hybrid algorithm for forward modeling of elastic waves;

Based on Biot theory, the paper presented staggering grid finite-difference algorithm with any even-order precision of 3-C elastic wave e-quation in 2-D biphase dip anisotropic medium,and conducted simulation of elastic wavefield in homogeneous and two-layered biphase VTI and TTI media.

According to the principle and characters of elastic wave technique,the paper analyzes the present conditions of bolting monitoring in mine roadway,and elastic wave technique are introduced to apply to bolting monitoring.

Study of model for elastic wave velocity of unconsolidated sandstone;

In order to evaluate construction quality of the subgrade lime-soils based on the elastic wave velocity,effects of curing ages,lime contents and saturation processes on the compressive strength and the elastic wave velocity of the improved lime-soil were studied and their correlation was analysed by a large number of tests.

Based on the data of elastic wave velocity of weathered zone, the structural state of weathered zone described quantification ally.