Method for measuring rock fracture opening degree

The invention relates to the technical field of rock fracture detection, in particular to a method for measuring rock fracture opening, which comprises the following steps: carrying out a damage teston a standard rock test piece to obtain a fractured rock test piece, and putting the fractured rock test piece subjected to sealing and film covering into a confining pressure loading device; performing a hydrostatic confining pressure test on the fractured rock test piece by using a confining pressure loading device, and measuring the confining pressure in the hydrostatic confining pressure testprocess and the circumferential deformation of the fractured rock test piece; forming a corresponding relation between the confining pressure measured in the hydrostatic confining pressure test process and the circumferential deformation, and obtaining a rock fracture opening degree formula according to the corresponding relation; and finally, applying a measured confining pressure to the fractured rock test piece by using