Sublever caving mining model in large subsection without sill pillar

Abstract

Comparing with prior method for determining structure parameters based on transitional theory, the invention builds mathematic model to calculate parameters accurately so as to overcome disadvantages of determining parameters based on operating experience and engineering analogy. Thus, production efficiency and technical economical index of mine is raised. The technical scheme is as following: after height of subsection is selected in mining model in large subsection without sill pillar, drawing off height Hf is determined. C is determined based on relational expression Cú¢0.000819Hf2-0.025Hf+2.578. Then, entrance span L is determined based on Hú¢(3 / 2)í‡Cí‡L. Advantages are: simple technical scheme, high accuracy for parameters, better technical economical index. The invention is suitable to exploitation for underground mine.

Description

1. Technical field

[0001] The invention relates to an underground mining technology, in particular to a high-section, bottom-pillar-free, subsection caving mining model. 2. Background technology

[0002] Pillarless segmental caving method is a standard, flexible and efficient mining method, which is widely used in ferrous metallurgical underground mines, and also occupies a large proportion in nonferrous metals, chemical industry and other fields. For a long time, restricted by the traditional ore-drawing theory, the model and structural parameters of the sub-pillar caving mining method can only be determined by production experience and engineering analogy. The structural parameters of the sub-pillar caving mining method are in the design specification , production are adopted: the section height H is not less than the method of determining the stope structure parameters of the approach distance L, generally H = 1.0 ~ 1.2L, resulting in low mine production efficiency, poor ...

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