DOI: 10.11799/ce202502008
Deformation and failure characteristics of weakly cemented,swellable and water-rich coal roadway surrounding rock and its control technology
HANG Yinjian
LIU Honglin
LI Guodong
Abstract：Aiming at the significant roof settlement and bolt fracture of weakly cemented,swellable,and water-rich coal roadway surrounding rock,in No.A4301 transportation gateway of Saier No.6 Mine,the physical and mechanical characteristics of weakly cemented soft,the deformation and failure characteristics of roadway surrounding rock and the instability mechanism of anchorage body were studied.Then,the corresponding surrounding rock control technology was put forward and applied in the field.The results showed that the clay mineral content of the weakly cemented rock on the roadway roof is high,among which the montmorillonite content is over 10%,the average disintegration time of sandy mudstone is 0.97 h,and the average swelling rate is 5.43%.Affected by fissure water in the A5 coal seam,the roadway exhibits severe roof subsidence and floor heave,resulting in a high failure rate of bolt(cable)support.When the roof is saturated,the strength of the surrounding rock significantly decreases,generating substantial swelling stress and vertical expansion deformation,which leads to tensile or shear failure of bolts(cables)and ultimately the collapse of the support system.Field practice demonstrated that the integrated"bolt-seal-modification"control technology effectively mitigated deformation and failure of surrounding rock in water-rich,weakly cemented,and swellable soft rock roadways.This study provides valuable insights for the theoretical and technical development of stability control in such challenging roadway conditions.
Keywords：weakly cemented soft rockswellabititysurrounding rock stabilityborehole grouting
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 54-60 )