Roof cutting and pressure releasing method for double-filling wall structure in gob-side entry retaining

The invention discloses a roof cutting and pressure releasing method for a double-filling wall structure in gob-side entry retaining. According to the method, a high-water material is used to construct a first high-water material filling wall on the upper section stoping working face along the edge of a gob; a row of anchor cables are arranged at the edge of the first high-water material filling wall in the propulsion direction of the upper section stoping working face; a second gangue filling wall is constructed on the sides of the anchor cables in the propulsion direction of the working face; the edge of the second gangue filling wall is drilled and filled with explosive or static crushing agents; and then roof cutting is conducted through the pre-splitting blasting effect of the explosive or the static force rock breaking effect of the static crushing agents. According to the method, the gangue wall and the filling wall are arranged to jointly support the overburden weight on the lower section working face