A Blasting Method for Slope Stability Control in Open Pit Mine

Abstract

An embodiment of the invention discloses a stable-control blasting method for open-pit mine slopes, which relates to the technical field of exploitation of open-pit mines and is invented for solving the problem that damage of the slopes by blast vibration needs to be relieved so that the open-pit mine slopes can be highly stabilized. The method includes: quantity of priming explosive of a largest section in a blasting area close to an open-pit mine slope is limited; and delay time for open bench blast control rows of the blasting area close to the slope and blast holes corresponding to all the control rows are 1-4ms per hole-pitch meter, and delay time for rowed blast holes is 10-30ms per row-spacing meter. The stable-control blasting method is applicable to open-pit mining, and also applicable to hydropower engineering, excavation of large-sized underground workshop chambers, cutting engineering and the like, which need slope maintenance.

Description

technical field [0001] The invention relates to the technical field of open-pit mining, in particular to a blasting method for side slope stability control of an open-pit mine. Background technique [0002] In open-pit mining, the ore rock is usually divided into horizontal layers of a certain thickness and mined layer by layer from top to bottom. As a result of this mining, stepped steps are formed around the open-pit mine, and the slope composed of multiple steps is called the open-pit mine slope. The final slope of an open-pit mine refers to the slope formed by the steps left after mining has ended and reached the final state. [0003] see figure 1 As shown, the steps are composed of the following elements: upper flat plate 1, lower flat plate 2, slope surface 3, slope top line 4, slope bottom line 5, height h, and slope angle a. [0004] see figure 2 As shown, the steps can be divided into according to the purpose: the working platform 21 is used to arrange mining a...

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Problems solved by technology

[0008] In order to ensure the stability of the final slope of the stope, in the prior art, the following technical measures are usually adopted for the formation of the slope: the 1-2 rows of blast holes near the final slope adopt controlled blasting such as inclined holes, smooth blasting, and dense holes to reduce the Hole row spacing, reducing blasting charge, reducing the vibration impact of blasting on slopes, and carrying out special dehydration work for mines with complex hydrology and geology. It is impossible to essentially reduce the blasting vibration hazard to the slope

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