The invention belongs to the technical field of
rock engineering, and particularly relates to a variable-stiffness
elastic energy storage device and a method thereby for testing rock
instability. Theinvention has the following technical scheme that the variable-stiffness
elastic energy storage device comprises a pressure head, a guide rod, a base, a
gasket and a disc spring, wherein the guide rodis vertically installed on the center of the base; the
gasket and the disc spring are independently sheathed to the guide rod; the end of the guide rod is provided with a guide hole; the center of the pressure head is provided with a guide post; the guide post and the guide hole are matched; and the guide post is placed in the guide hole. By use of the variable-stiffness
elastic energy storage device and the method thereby for testing rock
instability, the variable-stiffness elastic
energy storage device has the characteristics of small
land occupation, large stiffness regulation range, convenience in
processing and manufacture, low maintenance and repairing cost and long service life and can be combined with various rock mechanical test machines, and an
instability testing method is adopted to test rock instability characteristics under different test conditions.