Sublevel filling method for a heavy orebody in deep stoping based on collaborative

To solve the problems of the precontrol roof sublevel filling method in deep mining, such as the complexity of the excavation process of precontrol roadway roofs and the suseeptibility of precontrol roofs to blasting vibration, this article introduces a collaborative stoping based sublevel filling method which utilizes horizontal and vertical holes at the same time. The sublevel filling method can effectively solve the roof stability problem of surrounding rock through changing the precontrol roof into a rear controlroof by altering the support order. Furthermore, optimization research is performed on the sublevel filling method based on collaborative stoping:firstly, the structural parameters are optimized by stability analysis using SURPAC and ANSYS; then, the partition drawing and supporting method is applied to solve the problems of the poor support quality of the two sides and the inefficient ore-drawing. A case study of Xincheng Gold Mine shows that the displacement of the roof significantly decreases and the economic indicators:improve, indicating safe and high-efficient mining of the thick and large orebody under high geostress.