Roadway protection method for multi-coal-seam gob-side entry retaining in real crustal stress environment

The invention discloses a roadway protection method for multi-coal-seam gob-side entry retaining in a real crustal stress environment. The method comprises the following steps: step 1, sample preparation; 2, a multi-field coupling coal and rock mass dynamic disaster prevention and control technology simulation system is prepared for installation; thirdly, true triaxial prestress is applied; fourthly, true triaxial mining-induced stress is applied, the stress value of a fourth loading device in the Z direction is changed to be 6 MPa, 8 MPa and 10 MPa, unloading is conducted till a coal seam roof is damaged, and after damage, sigma z4 is kept unchanged so as to simulate the roadway protection effect of gob-side entry retaining of the goaf; 5, starting a high-speed camera; carrying out visual monitoring and recording on the whole loading process; 6, performing other tests in the same group; 7, ending the test; the roadway protection effect simulation of large-size multi-coal-seam gob-side entry retaining can be