Coal Mine Roadway Support System Based on Foam Concrete and U-beam Steel
A combined support system consisting of steel mesh,anchor rods,anchor ropes,sprayed concrete,compressible U-beam,foam concrete damping layer,and fissure rock buffer layer was proposed for the large deformation roadway of soft rock in coal mines.The technical means of numerical analysis and on-site monitoring were used.The numerical analysis results show that the foam concrete absorbs most of the deformation of the surrounding rock,the shrinkage rate of the U-beam is significantly reduced,and the average axial force of the U-beam is in the relationship of second-order equation with the thickness of the foam concrete.In engineering practice,when the thickness of foam concrete exceeds 30 cm,the damping effect is no longer obvious.And the on-site monitoring results show that in the first 20 d after the formation of the support system,the displacement of the surrounding rock and the force borne by the U-beam show an increasing trend,but the increasing trend is reduced.
surrounding rockcombined support systemU-beamfoam concrete
NETL
NSTL
万方数据
维普
