Method for determining rock strength based on CT scanning

The invention provides a method for determining rock strength based on CT scanning. The method specifically comprises the following steps: obtaining the maximum compressive strength of a certain lithologic rock and the maximum CT value corresponding to an initial CT value and the maximum compressive strength through combination of a mechanical experiment and CT scanning, performing numerical fitting on multiple groups of mechanical test strength values and CT values to prepare an image, and determining the slope k of the image formed between the strength value sigma and the CT value of a test piece; and then the numerical value is substituted into a relational expression of the strength value sigma and the CT value of the test piece to obtain a rock strength value calculation formula, and in practical application, the compressive strength of the rock can be directly calculated only by measuring the CT value of the rock. The method provided by the invention can replace indoor tests to rapidly, effectively and