nstability mechanism analysis of pressure-arch in coal mining feld under different seam dip angles

Authors

Shuren Wang Opening Project of Key Laboratory of Deep Mine Construction, Henan Polytechnic University, Jiaozuo 454003, China Author
Ning Li School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004, China Author
Chunliu Li Institute of Urban Construction, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China Author
Zhengsheng Zou Opening Project of Key Laboratory of Deep Mine Construction, Henan Polytechnic University, Jiaozuo 454003, China Author
Xu Chang Opening Project of Key Laboratory of Deep Mine Construction, Henan Polytechnic University, Jiaozuo 454003, China Author

mining field, pressure-arch, instability mecha-nism, failure modes

In order to study the instability mechanism of the pres-

sure-arch in the mining field under different dip angles of the

coal seam, the structure mechanics model of the pressure-arch

in the mining field was built based on a practical engineer-

ing. The moment, shear, and axial force at any section of the

pressure-arch axis are obtained through the pressure-arch

axis equation. It is concluded that the entire instability of the

pressure-arch is caused by local damage and the failure mod-

els of local damage has three forms, namely tension-failure,

shear-failure and compression-failure through the comprehen-

sive analysis. The results show that with the increase of the

dip angle of the coal seam, the failure modes of the pressure-

arch change from compression-failure at the arch-waist and

shear-failure at the skewbacks to shear-failure at the vault and

tension-failure at the front of skewback. It is important to con-

trol the key parts, and actively regulate the mine pressure ac-

cording to the instability criterion of the pressure-arch in the

longwall mining field.