Research on the characteristics of tensile-shear fracturing and zone control method for surrounding rock of coal roadway under high deviatoric stress
GAO Yongge
XU Zhenming
LUO Feng
CHEN Zhen
WANG Peng
LI Meng
GAO Shuai
HE Tuan
Abstract：Taking coal roadway of high deviatoric stress in a coal mine in Shanxi as the background,the distribu-tion characteristics,evolution law and fracturing mechanism of tensile-shear fracturing were investigated combing the theoretical analysis,numerical and physical simulation. An innovative and optimized full-length zoning support-ing method along the excavation direction was proposed for surrougnd rock of roadway. The results show with lateral pressure coefficient is 0.60,wedge failure occurs in two sidewalls of roadway,the roof and floor are obviously un-loaded,and the stress concentration occurs at the four roadway corners. As lateral pressure coefficient gradually de-creases to 0. 24,the "butterfly wing" gradually developed with the failure iniating from two sidewalls under the effect of shear fracture,eventually forming a butterfly-shaped fracture pattern. The tensile-shear mixed fracture zone existed in the shallow part of the excavation damage zone,but dominated by tensile fractures. However,the shear fracture is dominant in the deep part. The fracturing evolution process of surrounding rock can be divided into three stages:self-destruction stage of the circular free surface,gestation and expansion stage of the"butterfly wing",and expansion and stable stage of the "butterfly wing". The stress threshold according to the full-length partition of roadway was defined and the full-length zonal control method of the roadway was put forward. This research provides theoretical basis for the differential supporting of roadway during coal mining.
Keywords：high deviatoric stresstensile-shear fracturetop coal roadwayzoning support
Publication Date：2024-08-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 62-75 )