Method for transition from non-pillar sublevel caving method to upward horizontal cut-and-fill method

Abstract

The invention relates to a method for transition from a non-pillar sublevel caving method to an upward horizontal cut-and-fill method. The technical scheme is as follows: in a section close to and below a caved area (1) of a mining area, the section is divided into an isolation zone (2) and a recovery area (3), the upper part of the section is the isolation zone (2), and the lower part of the section is the recovery area (3). The section is exploited in such a sequence that the recovery area is exploited before the isolation zone (2) is exploited. An exploitation method of the section is as follows: the upward horizontal cut-and-fill method is adopted for the recovery area (3), and the non-pillar sublevel caving method is adopted for the isolation zone (2). The thickness of the isolation zone (2) is one or two times of the sublevel height of the non-pillar sublevel caving method. The isolation zone (2) is exploited after final setting of a filling body of the recovery area (3). The method has the characteristics that the loss ratio of ore can be reduced, the dilution rate can be reduced, the surface vegetation and the ecological environment can be protected, atmospheric conditions of a stope can be improved, and the recovery is simple.

Description

technical field [0001] The invention belongs to the technical field of mining. In particular, it relates to a method for transitioning upward from the bottom-less column sub-caving method to the horizontal layered filling method. Background technique [0002] In the last century, more than 90% of large and medium-sized underground mines in my country were mined by the highly efficient and low-cost pillarless sub-level caving method. In the segmental caving method without pillars, as the mining face advances, the surrounding rock caving fills the goaf at the same time, so as to realize the management and control of ground pressure. When the sub-level caving method without pillars is used, with the collapse of surrounding rocks and ores, it will cause different degrees of subsidence or subsidence on the surface, seriously destroying the vegetation and ecological environment on the surface; The loss and dilution increase, and the ventilation conditions of the stope are poor. ...

AI Technical Summary

Problems solved by technology

When the backfilling method is used to mine the mining area, a certain thickness of ore is left between the caving area and the mining area. This part of the ore is permanently left underground and cannot be recycled, which reduces the utilization rate of resources and increases the loss rate of ore. , and the filling process is complex

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