Method for predicting maximum height of filling mining diversion fissure zone

Abstract

The invention discloses a method for predicting maximum height of a filling mining diversion fissure zone. Supposing a precondition that no caving zone is generated and only a fissure zone and a sagging zone are generated in the advancing process of a working face, a mathematical model which is used for predicting the maximal height of the filling mining diversion fissure zone; a critical value of top board deformation is used for determining the strata failure low of an over-limit stress limited space; and whether the strata fails is determined according to the critical value of the top board deformation. Therefore, compared with the prior art, the method has advantages of more direct calculation and higher convenience. A calculation formula for predicting the maximum height of the filling mining diversion fissure zone can be simply and accurately obtained. Furthermore the parameters in the formula can be easily acquired, and higher accuracy of the calculation process can be realized. Simple and direct calculation can be obtained. The method can quickly, effectively and accurately predict the maximum height of the diversion fissure zone and is suitable for guidance for actual production, thereby realizing safe mining under water body.

Description

technical field [0001] The invention relates to a method for predicting the maximum height of a water-conducting fracture zone in filling mining, which belongs to the field of mining engineering. Background technique [0002] In the appendix of "Regulations for Coal Pillar Retention and Pressure Coal Mining in Buildings, Water Bodies, Railways, and Main Shafts" (2000) (hereinafter referred to as "Three Regulations"), the water-conducting cracks for all caving mining methods are proposed. The calculation formula for the zone height, the height of the water-conducting fracture zone is calculated according to the cumulative mining thickness, and the application range of the formula requires that the single-layer mining thickness is 1-3m, and the cumulative mining thickness does not exceed 15m. [0003] However, it does not clearly propose a method for predicting water-conducting fracture zones during filling mining, and the mining thickness during paste filling mining cannot be...

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Problems solved by technology

[0005] Most of the traditional methods are calculated through mechanical relations. However, the stress in the underground stope is very complicated, and it is difficult to find the corresponding relation accurately.

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