SUPPORT METHOD OF ROADWAY SIDE AND FLOOR WITH COORDINATE STABILIZATION OF BOTTOM ANGLE PRESTRESSED GROUTING BOLTS AND BOTTOM ANGLE ANCHOR CABLES AT DIFFERENT ANGLES

The invention relates to a roadway side and bottom supporting method for achieving synergistic stabilization of prestressed grouting anchor rods and anchor cables at different angles and bottom angles, and belongs to the field of mine supporting. The method comprises the following implementation steps that 1), bottom angle prestressed grouting anchor rod grouting holes are drilled in the direction that the bottom angle of a roadway and the horizontal plane form an angle of 45 degrees; 2), the bottom angle prestressed grouting anchor rods are installed, prestress is applied, and grouting is completed; 3), bottom angle prestressed grouting anchor cable grouting holes are drilled in the direction that the bottom angle of the roadway and the horizontal plane form an angle of 30 degrees; and 4), the bottom angle prestressed grouting anchor cables are installed, prestress is applied, and grouting is completed. According to the method, the prestressed anchor rods and the anchor cables are installed at different angles, so that a conical area is formed between the prestressed anchor rods and the anchor cables, a reinforced concrete conical dam body is formed in the direction of the roadway after the anchor cables are grouted, a large part of circumferential stress transmitted by a surrounding rock bearing structure on the dam body can be transferred to the deep position of surrounding rock or coal, and therefore displacement of roadway sides and floor heave is effectively restrained, and mine safety production is guaranteed.