On the basis of the study of principle fundamentals for geostress measurement by hydraulic fracturing technique,the direction of breaking fracture on the hole wall and the universally applied calculating formulas of data processing for 3-dimensional geostress measurement are studied profoundly with practical examples.

Theoretical analysis of the fracture strike of the poured concrete slab and the engineering application;

The principal fracture strike and fracture density inverted using the wave-field characteristic parameters such as amplitude and velocity of wave-field which were extracted from data of P-waves and converted waves were applied to investigate factures in the fractured reservoir.