Mechanical Characterisation of Anchor Support in Roadway Along Air Excavation
The mechanism of high prestressing support system from the theory provides a reliable basis for support design.At the same time should be developed to apply high prestressing to the anchor construction equipment and supporting materials,so that the anchor support really achieve active,timely support,from low strength,high strength to high stiffness,high prestressing support of the leap.Through simulation,under the condition of anchor support,no matter the anchor row spacing is 1.0 m,1.2 m or 1.4 m,the maximum vertical principal stress is not much changed,which is about 34.8 MPa,and the maximum horizontal principal stress is not much different,which is about 19.2 MPa.However,with the increase of the anchor row spacing,the stress spreading effect of the active support by the anchors is getting worse and worse.Under the action of anchor+top anchor cable support,from the distribution characteristics of stress,displacement and plastic damage zone of the roadway and the analysis of economic cost,the use of anchor row spacing of 1.2 m can effectively control the deformation of the roadway peripheral rock,which can fully meet the requirements of roadway support.
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