Method for relieving stope mine pressure based on key layer reconstruction principle

Abstract

The invention discloses a method for relieving stope mine pressure based on a key layer reconstruction principle. The method comprises the following steps that firstly, the geometric dimension of a reconstructed key layer is determined through theoretical calculation, the geometric dimension includes four parameters of inclination length, strike length, thickness and distance from a mining coal seam, and the thickness and the lithology difference of the coal seam are fully considered; a quantitative mutual feedback relation between the strength and the thickness of the key layer is established, a method for determining the strength and the thickness of the key layer is put forward from the perspective of ensuring that the key layer does not slip and lose stability, and quantitative design of a key layer reconstruction scheme is achieved; secondly, a key layer reconstruction field scheme is determined, a cross stepping bottom inverse grouting scheme is provided, parameters such as drill hole arrangement, drill hole reducing, grouting materials and grouting time are designed, and the scheme is reasonable in design and high in operability; and finally, key layer reconstruction construction processes including grouting time, procedures, labor organization and the like are determined.

Description

Technical field [0001] The present invention relates to the field of mine strata control pressure and, in particular, relates to a method of mining face mitigation layer based on the key principles of reconstruction. Background technique [0002] Coal underground mining of coal mining is carried out in a certain depth below the surface of the formation, transport activities, layered rock covered with nearly tens of meters or even kilometers on coal. Layered rock lithology, thickness, strength, chemical composition, etc. showed a larger difference. The mining subjects Pressure and Strata known control theory, the formation and rupture distribution rule is an important factor affecting the safety of coal mining, such as the presence of the following two cases: [0003] (1) When the upper strata in the seam there is one to several layers of large thickness, high strength hard rock, taken out with the continuous seam, the hard rock may occur regularly broken, and form a stable beam a...

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Problems solved by technology

[0006] In order to solve the problem of frequent mine pressure accidents in the stope under the condition of no key layer stratum, the patent proposes a method for slowing down the mine pressure in the stope by rebuilding the key layer in view of the stratum condition where the key layer cannot be formed in the upper rock layer of the coal seam

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