Two-segment dual-wheel sequential top-coal caving method

The invention discloses a two-segment dual-wheel sequential top-coal caving method, which is used for further optimizing the top coal-coal caving process and increasing the recovery rate of coal on a fully mechanized caving face. In the method, all caving coal supporters are uniformly partitioned into two segments; cutting and caving are performed alternatively during coal caving, i.e., coal is caved by using the two-segment caving coal supporters once every time coal is cut by using a coal mining machine; the top-coal caving step distance is 0.8 meter, so that tip management is facilitated; coal is not caved by transition caving coal supporters on upper and lower tips and tip caving coal supporters, i.e., coal is not caved by the first three and last three caving coal supporters of all the caving coal supporters; coal is caved at each segment in sequence in two turns; coal is caved at the interval of ten caving coal supporters in each turn; coal caving is stopped when the amount of caved coal is two thirds o