Rock mechanical behavior test and analysis method based on quasi-real deep in-situ sample

The invention relates to a rock mechanical behavior test and analysis method based on a real-simulated deep in-situ sample, which comprises the following steps: measuring ground stress to obtain three-dimensional stress of a stratum, then applying the three-dimensional stress to the real-simulated deep in-situ sample by virtue of a true triaxial testing machine, stably loading the maximum principal stress at a certain loading rate until the sample is damaged, and finally obtaining the rock mechanical behavior of the real-simulated deep in-situ sample. Obtaining a stress-strain curve of the sample; calculating parameters such as closing stress, crack initiation stress, damage stress, peak stress, residual stress, elastic modulus, Poisson's ratio, internal friction angle and cohesive force, and quantitatively analyzing the influence of internal stress on mechanical properties and deformation characteristics of rocks by using a data standardization method. The in-situ mechanical test is carried out on rock-like