A high-efficiency mining method for pre-controlled roof of gently inclined medium-thick ore body

Abstract

The invention discloses a gently inclined medium-thick ore body pre-controlled roof efficiently mining method. The ore body is divided into equal-width ore blocks along strike, and the ore blocks are divided into strip-type stopes along ore body tendency. A rail haulage roadway, a mining area slope roadway, a slice drift contact roadway and a slice drift are arranged at the bottom wall of the ore body, a contact roadway is constructed from the slice drift to the ore body, and penetrates through the ore body construction to form an upper layer filling backwind support roadway, an upper layer filling backwind chamber, an upper layer filling backwind drilling hole, a pseudo-inclined contact roadway, a lower layer filling backwind support roadway, a lower layer filling backwind chamber and a lower layer filling backwind drilling hole, and order matching surrounding rock is supported by adopting an anchor cable. The strip-type stopes are backstopped in two steps that 1, odd number strip-type stopes are backstopped and filled with a high strength cemented filling body, and 2, even number strip-type stopes are backstopped and filled with a low strength filling body. Medium-deep hole mining, scraper mining and subsequent filling of a goaf are adopted in stope backstopping. The gently inclined medium-thick ore body pre-controlled roof efficiently mining method has the advantages of safe backstopping operation, large stope production capacity, high efficiency and the like.

Description

technical field [0001] The invention belongs to the field of underground mining, and in particular relates to a high-efficiency mining method for a pre-controlled roof of a gently inclined medium-thick ore body. Background technique [0002] For the gently inclined medium-thick ore body, especially the gently inclined medium-thick ore body with an ore body dip angle greater than 15°, it is very difficult to mine this type of ore body due to the difficulty of blasting ore falling and ore shipment. If the stability conditions of the hanging wall surrounding rock are poor, it will be even more difficult to achieve efficient and safe mining. [0003] The surrounding rock of the hanging wall has poor stability conditions, which put forward higher requirements for safe mining. At present, the commonly used methods mainly include reducing the span of the stope, reserving roof protection mines, and strengthening roof support. Reducing the span of the stope can improve the stabilit...

AI Technical Summary

Problems solved by technology

Reducing the span of the stope can improve the stability of the stope to a certain extent, but for poor surrounding rock, even if the span is greatly reduced, the effect is not obvious, and this method will greatly reduce the production capacity of the single stope , so it is not conducive to efficient large-scale mining

The prerequisite for reserving the roof protection mine is that the rock mechanical properties of the ore are good, and a certain thickness of ore can be reserved to support the broken hanging wall rock. This method has many restrictions, and leaving the roof protection mine will cause the ore loss, and it is difficult to set a thick roof protection ore body in specific engineering practice and to operate on site.

The reinforced roof support is divided into top-cutting support and pre-supporting. The top-cutting support is to mine the ore close to the surrounding rock of the upper wall first, and then support the roof while digging and mining. The disadvantage of this method is that the process is cumbersome and the production efficiency is low. High production cost and poor ventilation

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