Frozen soil layer blasting method

Abstract

The embodiment of the invention provides an open-pit mine step frozen soil layer blasting method, and relates to the technical field of open-pit mine mining. The method comprises the following steps of drilling at least one row of inclined holes downwards parallel to a slope surface on an upper flat plate of an open-pit mine main step, and drilling a plurality of rows of straight holes downwards perpendicular to the upper flat plate; loading emulsion explosives into the straight holes by adopting an axial coupling charging structure, putting nonel detonators into the straight holes, and leading pins of the nonel detonators out of the holes; loading the emulsion explosives into the inclined holes by adopting an axial non-coupling charging structure, connecting the emulsion explosives in the inclined holes in series by using a detonating cord and then leading the emulsion explosives out of the holes, and blocking an orifice by using stemming; connecting the detonator pins outside leading-out holes and detonating cords to primer detonators, and forming a detonating network; and detonating the inclined holes firstly, pre-splitting the step slope surface, and then detonating the detonating network from the straight holes in the middle row to two sides in an inter-row step-by-step increasing delay blasting mode in sequence. According to the method, the stripping construction progress of open-pit mine earthwork can be accelerated conveniently. The method is suitable for winter mining engineering of an open-pit mine.

Description

technical field [0001] The invention relates to the technical field of open-pit mining, in particular to a blasting method for frozen soil layers. Background technique [0002] Affected by the winter climate, the exposed surface of the open-pit mine will form a seasonal frozen soil layer, which will bring great inconvenience to the construction and seriously affect the progress of the stripping of the open-pit mine. In order to ensure the normal speed of earthwork stripping construction, the annual To plan stripping tasks and realize normal coal production continuation, it is necessary to loosen and blast the permafrost layers of steps other than the steps where the yellow sand layer is located. Contents of the invention [0003] In view of this, an embodiment of the present invention provides a blasting method for a frozen soil layer, which is convenient for accelerating the construction progress of earthwork stripping in an open-pit mine. [0004] In order to achieve th...

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Problems solved by technology

[0002]Affected by the winter climate, the exposed surface of the open-pit mine will form a seasonal frozen soil layer, which will bring great inconvenience to the construction and seriously affect the stripping of the open-pit mine. Progress, in order to ensure the normal earthwork stripping construction speed, complete the annual planned stripping task, and realize the normal coal production continuation, it is necessary to loosen and blast the permafrost layers of steps other than the steps where the yellow sand soil layer is located

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