Rapid determination method for the firmness coefficient of coal in downhole
YU Hualong
WANG Haijun
WU Yan
LIU Shande
XIAO Wenzhao
YANG Xiang
Abstract：In view of the lack of a method and instrument for rapid determination of f-value in down-hole,a method suitable for rapid determination of f-value in downhole was found.Through the com-parative test and the analysis of the applicability of the test method in combination with the downhole environment,the most suitable method for the determination of downhole f-value was determined.The results show that the"drop weight method"has the advantages of simple site requirements,is easy to carry the instrument,high measurement accurately and rapidly.Therefore,the"drop hammer method"is the most suitable method for rapid determination of f-value in the downhole.This method can provide a reference for the rapid determination of the firmness coefficient of coal,provide rapid,accurate and effective technical guidance for coal mine production,and provide reliable technical sup-port for coal mine safety production.
Keywords：the firmness coefficient of coalrapid determinationfalling hammer methodcoal mine in downhole
Publication Date：2025-02-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)