Study on micro-expansion cement performance test and grouting parameters in coal mine extraction drilling
LI Zhi-li
QIE Li-min
WANG Li-tao
ZHAO Xian-ming
Abstract：By studying the testing method for the expansion rate of hole sealing cement and simulating sealing tests under different con-ditions,it was found that the expansion rate of sealing materials remains unchanged under different water cement ratios.Pressure grou-ting was superior to non pressure grouting and when sealing holes with pressure,the water cement ratio after being filtered by the bag reached about 1∶2,and its compressive strength after solidification exceeded 10 MPa,meeting the airtightness requirements for drilling and sealing holes.Finally,it was clarified that the grouting pressure should be 1.5 MPa and the grouting standard should had a stabiliza-tion time of no less than 1 minute.
Keywords：hole sealing cementexpansion ratewater cement ratiopressure grouting
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 87-91 )