Method for testing triaxial compressive strength fatigue factor of set cement under high confining pressure fracturing working condition

The invention discloses a cement stone triaxial compressive strength fatigue factor testing method under a high confining pressure fracturing working condition, which comprises the following steps of: respectively calculating a first-to-second interface stress ratio, a pressure alternation round number and a cement stone compressive strength fatigue factor under a pressure alternation condition in a fracturing process by adopting a numerical simulation method; drawing a three-dimensional curved surface chart by taking the three parameters as an X axis, a Y axis and a Z axis respectively; after the pressure alternating scheme of a new fractured well is determined, the first-second interface stress ratio under the pressure alternating condition in the fracturing process is calculated, and according to the first-second interface stress ratio and the number of fracturing rounds, the cement stone triaxial compressive strength fatigue factor can be obtained by looking up a graph. According to the method, the real c