Water-rich broken ore body high-stage stope roof anchor rod support parameter optimization method

The invention relates to a water-rich broken ore body high-stage stope roof bolt support parameter optimization method, and belongs to the field of metallurgical mine mining engineering. According to the technical scheme, the length interval of the anchor rod is judged by taking a plastic zone as a loose zone based on a suspension theory and a loose zone theory in combination with an unsupported numerical simulation result; the maximum displacement, stress and plastic zones of the stope roof after supporting are studied by changing the length, interval, row pitch and anchoring force of anchor rods and equally dividing 5-9 schemes, the overall settlement curve of the stope in each scheme is obtained, and 4-6 supporting schemes with good effects are primarily selected in combination with the settlement distribution range of the stope roof; and selecting a roof settlement amount, a stress release area height, a plastic area and an anchor rod total length by using an index satisfaction degree method, establishing