A method for grading and predicting the height of overburden rock fracture development based on rock mass quality index

Abstract

This invention discloses a method for predicting the development height of overburden fractures based on rock stratum quality indicators, belonging to the field of mining surveying technology. It predicts the development height of overburden fractures above the working face in a mining area based on rock quality indicator data. The prediction process involves: firstly, calculating the rock quality index (RQD) of the rock strata above the working face using the rock quality index calculation formula, based on the percentage of intact core samples from boreholes above the working face; secondly, defining the fracture factor of each rock stratum based on its RQD value, and then constructing a graded prediction function model for the development height of overburden fractures; finally, calculating the development height of overburden fractures based on the rock stratum quality index values ​​of the working face. The calculation logic is rigorous, the results are simple and accurate, and they conform to actual conditions, providing important theoretical basis for calculating the development height of overburden fractures in mines and for engineering geological risk assessment.

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