The Research on Abutment Stress Distribution and Fracture Characteristics of Coal Seam in Longwall Face
The abutment stress results from the load coming from overlying strata above the influence range of abutment stress and the load which coming from overlying strata above the stress shell passed by the shell. Through the mechanical calculation,this paper analyzed abutment stress distribution and fracture characteristics of coal seam resulted from the load of overlying strata passed by stress shell which exists in surrounding rock of working face, and obtained the laws of abutment stress distribution and fracture in coal seam in combination with numerical simulation and site testing. The characteristics of abutment stress distribution and fracture are related to the geometrical shape of the stress shell, such as height of the stress shell, horizontal distance between top of stress shell and coal wall,and width of stress shell skewback.
Qunjie Xu, Honghua Ge and Junxi Zhang
C. M. Li "The Research on Abutment Stress Distribution and Fracture Characteristics of Coal Seam in Longwall Face", Advanced Materials Research, Vols. 361-363, pp. 103-107, 2012