Method for calculating stability of section coal pillar

The invention provides a method for calculating the stability of a section coal pillar, and the method comprises the following steps: S1, calculating the bending elastic energy of a free-side basic roof: building a free-side basic roof mechanical model, and calculating the bending elastic energy UW of the free-side basic roof according to the free-side basic roof mechanical model; s2, calculating the yield elastic energy of the section coal pillar: establishing a lateral stress model of the section coal pillar, obtaining a lateral stress distribution calculation formula of the section coal pillar, and obtaining a distribution expression of the yield elastic energy Es of an elastic area of the section coal pillar along the width direction of the coal pillar according to the lateral stress distribution calculation formula of the section coal pillar; and S3, analyzing and judging the stability of the section coal pillar by taking UW > Es as a coal body instability criterion of the elastic area of the section coa