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Natural caving method

A natural caving method and natural technology, applied in ground mining, earth drilling, underground mining, etc., can solve the problems of high safety accident rate and high mining cost, achieve high safety accident rate, high mining cost, and reduce blasting smoke the effect of

Inactive Publication Date: 2018-01-05
NORTHEASTERN UNIV
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Problems solved by technology

[0012] The object of the present invention is to provide a natural caving method to solve the problems of high safety accident rate and high mining cost in blasting mining in mines whose ore bodies are more stable than the surrounding rocks of the upper wall and the lower wall

Method used

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Embodiment 1

[0141] The inclination angle of the ore body 3 in an iron mine is 60°, the thickness of the ore body 3 is 40m, the average grade of ore is 35%, the size of the ore block is: the stage height is 60m, the ore block is arranged along the strike, the width is 40m, and the length is 50m. The surrounding rock 2 of the footwall of the ore body 3 is metamorphic white quartz sandstone, which is moderately stable, and the stratum's Platts coefficient is f=4~5. 3’s Platt’s coefficient f=7~8, the ore body 3 is in contact with the upper and lower wall rocks, and the ore rocks are abnormally broken.

[0142] Adopt the implementation process of natural caving method of the present invention as follows:

[0143] Step 1: Use ultrasound, geophysical prospecting, microseismic monitoring and other means to carry out geological survey of the stope, and obtain such Figure 8 and Figure 11 Show the original stope ore rock fracture development data and other geological data necessary for the minin...

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Abstract

The invention relates to the technical field of underground mining, in particular to a natural caving method which is used for solving the problems that as for a mine where an ore body is firmer thanhanging side surrounding rock and heading side surrounding rock, during blasting mining, the safety accident rate is high, and the mining cost is high. The natural caving method comprises the following steps that artificial fracturing is conducted, specifically, according to geological data, the fracture distribution law and stress distribution data of a foundation, an ore body of a stope is artificially fractured; fracture monitoring is conducted, specifically, an artificial fracturing area is monitored, and thus the fracture distribution and extension ranges are obtained; and natural cavingis conducted, specifically, the ore body falls naturally. The natural caving method is suitable for mining of a mine where the ore body is firmer than hanging side surrounding rock and heading side surrounding rock.

Description

technical field [0001] The invention relates to the technical field of underground mining, in particular to a natural caving method. Background technique [0002] As an efficient and low-cost mining method, the natural caving method can fully recover and utilize resources when mining low-grade broken ore bodies, and has very obvious and unique advantages. [0003] The natural caving method is a high-intensity mining method that does not rely on large-scale rock drilling and blasting. This method uses the engineering factors of bottom pulling (if necessary, supplemented by cutting sides or pre-cracking at the boundary of the ore block) to induce The stress changes, so that the structural planes in the ore body continue to expand to form a continuous fracture network, and natural caving occurs under the action of self-weight. [0004] Its mechanism of action is as figure 1 As shown, in ore rocks with good collapsibility, the stress balance of the ore body in the ore block is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/22
Inventor 柳小波邵安林金长宇陈天宇王连成
Owner NORTHEASTERN UNIV
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