Studying the Kaiser Effect During Modeling of Rock Loading Conditions Using the NX-borehole Jack

Abstract The paper deals with modeling the stress state experienced by rocks in a loaded around-borehole volume to justify promising method of in-situ measurements based on Kaiser effect. Mathematical loading horizontal borehole walls NX-borehole jack direction principal components ? 1 or 3 natural field was performed for conditions unperturbed salt rock mass Verkhnekamskoe potassium deposit. As result numerical calculation stresses, it determined that recovery radial component r compression regions around occurs when jack’s pressure reaches initial value stress. At same time, concentration tangential ? these is retained. specimens were tested under modes similar states study effect using triaxial vessel. It found second cycle, values axial specimen field, unloaded after first stimulates acoustic emission. This regularity true case there no increase confining conf between cycles. In an and cycles, at higher than ones. shown nature depends type specimen’s caused growth resumption longitudinal microcracks, if > closure lateral microcracks < cycle.