Research on evaluation method of coal mine floor grouting effect considering microseismic data connectivity
Dang Baoquan
Yu Guofeng
Zhu Changhuai
He Shifang
Han Yunchun
Zhou Jisheng
Zhang Yanxi
Qin Guangjun
Zhang Gang
Abstract：Deep coal mining resources are affected by coupling effect of"three highs and one disturbance".The threat of water damage on floor becomes more and more serious.Ground area advance management is the main means for water damage prevention and control.Grou-ting to block potential water conduction channels is the most commonly used and mature technology at present.Due to limitations in moni-toring conditions and complex geological environment,there is insufficient monitoring data for evaluating grouting and how to characterise spreading range and process of the slurry has always been in urgent need of a solution.Based on this,according to the microseismic source parameters,this study proposed a fissure connectivity index that considers the spatial attributes and mechanism of microseismic sources,and forms a microseismic data-driven method to characterise effect of grouting in coal mine floors.A 3D model for visualizing the diffusion range of grouting was established as a pilot project for the floor grouting of X4 hole group in Xieqiao Coal Mine.The results showed that most of the microseismic events were involved in calibrating the spreading extent of the slurry and formed clear slurry spreading envelopes and fracture surfaces.In addition,the accuracy and effectiveness of the evaluation results were proved by XRD tests.This study can pro-mote the engineering application of microseismic monitoring technology in underground space grouting and provide reference for optimally evaluating the spreading range of the slurry and the reinforcement effect.
Keywords：coal minemicroseismic monitoringgroutingfracture connectivityslurry diffusion characterization
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 87-95 )