A Prediction Method for Maximum Height of Water Conducting Fracture Zone in Filling Mining

Abstract

The invention discloses a method for predicting the maximum height of a water-conducting fracture zone in filling mining. Assuming that no caving zone is generated during the advancing process of the working face, only crack zones and bending zones are generated as a precondition, and a guiding method for filling mining is established. The mathematical model for predicting the maximum height of the water crack zone uses the critical value of the roof deformation to judge the failure law of the rock formation in the limited space of excess stress, and judges whether the rock formation is damaged or not according to the critical value of the roof deformation. Therefore, compared with the prior art, it is more direct and convenient; the calculation formula for the maximum height of the water-conducting fracture zone in filling mining can be easily and accurately obtained, and the parameters in the formula are all easy to obtain, and the calculation result has a high degree of accuracy, which can be simple and direct , can quickly, effectively and accurately predict the maximum height of the water-conducting fracture zone, which is suitable for guiding actual production to achieve safe mining under water bodies.

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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