Underground metal mine stage stoping deep hole cutting and slot broaching method

Abstract

The invention discloses an underground metal mine stage stoping deep hole cutting and slot broaching method. The method comprises the steps that 1, the position of a cutting slot is selected; 2, the selected cutting slot is divided into an upper area and a lower area in the stage height direction, and the upper area and the lower area are the upper area and the lower area; 3, slot broaching blasting is conducted on the lower area in a medium-length hole lateral blasting manner; and 4, slot broaching blasting is conducted on the upper area in a manner of blasting in a delta-shaped manner. According to the method, the cutting slot is divided into the upper area and the lower area according to the stage height for blasting, the difficulty of stage stoping cutting and slot broaching blasting is lowered, the extra mining and cutting work amount is not increased, the blasting difficulty is lowered, the construction period is shortened, the cutting quality and efficiency are improved, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a method for cutting and pulling slots for stage mining in underground metal mines. Background technique [0002] The purpose of cutting groove blasting is to provide the initial free surface and blasting compensation space for underground stope mining. Therefore, the quality of cutting blasting and the shape of cutting grooves are very important to the recovery of the whole stope. [0003] When underground metal mines are mined using the stage mine method, the stage height is generally 40m~60m. How to form the initial blasting free surface in high stage mining has always been the key technology for the successful application of this type of method. Due to the high stage height, the cost of cutting the patio is high and difficult. With the increase of the construction height of the cut patio, it is difficult to guarantee the uprightness of the patio itself...

AI Technical Summary

Problems solved by technology

Due to the high stage height, the cost of cutting the patio is high and difficult. With the increase of the construction height of the cut patio, it is difficult to guarantee the uprightness of the patio itself, and it is also difficult to guarantee the cross-sectional size of the patio construction, which often results in the shape of the patio being high at both ends and narrow in the middle. Patio tilt and other problems

The occurrence of these problems will greatly affect the cutting and pulling blasting of stage recovery, and even lead to the failure of cutting and pulling blasting, which cannot provide an effective initial compensation space for subsequent mining blasting

[0004] In view of the above problems, the underground metal mines at home and abroad mainly adopt the following two methods for cutting and pulling blasting: the first is to use a raise drilling rig to cut the raised well to ensure the size and uprightness of the raised well section, but the construction cost of this method is High, and the well-forming section of a general raise drilling rig is 0.9m in diameter, the space formed is not enough to provide compensation space for cutting and pulling blasting, so generally 2-3 cutting raises are required to be constructed, resulting in a substantial increase in construction cost and construction period

The second method is to further divide the stage into multiple sections, construct and cut the raised well in each section, carry out the cutting and pulling groove blasting in the section, and finally form the stage stope cutting groove that meets the blasting requirements, but this The method divides the stages into sections, which increases the amount of mining and cutting work, resulting in problems such as complex cutting and slotting blasting process and complex initiation network.

Images