Classified recovery method for resource-exhausted mine block remaining coal pillars

A classified recovery method for resource-exhausted mine block remaining coal pillars comprises the steps that the recoverable block remaining coal pillars of a whole mine are refined, and coal-rock-sample physical and mechanical property testing is carried out on a rock-mechanic servo test system; a numerical simulation software is adopted to conduct evaluating on the stability of the recoverable block remaining coal pillars, and classifying is conducted on the stability of the recoverable block remaining coal pillars; a borehole stress meter and a rock stratum detecting and recording instrument are adopted to conduct testing on the stress distribution characteristics in the recoverable block remaining coal pillars and the internal failure characteristics of the recoverable block remaining coal pillars; grouting reinforcement materials are adopted to conduct grouting reinforcement treatment on a site test dilled hole internally; and aiming at the recoverable block remaining coal pillars of different types, m