Sublevel caving mining model in large span 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 / 6)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 The present invention relates to an underground mining technology, in particular to a segmental caving mining model with large spacing and bottomless pillars. 2. Background technology Pillarless segmented 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 method of determining the structural parameters of the non-pillar segmental caving mining method can only rely on production experience and engineering analogy. All adopt the method of determining stope structure parameters with segment height H not less than approach distance L, generally H=1.0-1.2L, resulting in low mine production efficiency and poor technical and economic indicators. 3. Contents of the invention The purpose of the present invention is: to...

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Problems solved by technology

For a long time, restricted by the traditional ore-drawing theory, the method of determining the structural parameters of the non-pillar segmental caving mining method can only rely on production experience and engineering analogy. All adopt: the determination method of the stope structure parameters with the section height H not less than the approach distance L, generally H=1.0~1.2L, resulting in low mine production efficiency and poor technical and economic indicators

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