Action mechanism of peripheral shear stress before and after grouting with hollow anchor cable in lower seam of contiguous seams
Aiming at the difficulty in surrounding rock control of broken roadway in lower seam of contiguous seams,we studied the control effect of surrounding rock before and after grouting with hollow grouting anchor cable by the means of theoretical analysis and numerical simulation,and analyzed the mechanism of the surrounding shear stress between the hollow grouting anchor cable and the surrounding rock before and after grouting.The results show that,the anchorage section conforms to the viscoelastic constitutive model before grouting,and the shear stress variation shows a single-peak curve,which firstly rises linearly,then declines nonlinearly and finally stabilizes;after grouting,the pre-stress field around the roadway forms a gradient entirety along the anchor cable,which redistributes the stress field around the roadway and reduces the shear stress strength,the stress variation shows a double peak curve,which firstly rises to a high peak in a quadratic linear manner,then declines nonlinearly and tends to be stable,while it rises again to a lower peak and finally falls and stabilizes,which indicates the shear strength of broken surrounding rock and soft rock roadway is significantly improved.
hollow grouting anchor cableshear stress of broken surrounding rockmechanism of actionroadway supportstress control
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