Study on the bearing performance of tunnel anchors under the condition of surrounding rock containing weak interlayers
Tunnel anchors,as the main load-bearing structure of suspension bridges,play an important role in the load-carrying performance of suspension bridges.At present,most of the studies on the load bearing performance of tunnel an-chors are based on the good integrity of the rock mass around the tunnel anchors,and fewer studies have considered the geological situation where the tunnel anchor structure crosses the weak interlayer.In order to study the change of tunnel anchor load bearing performance when there is a weak interlayer in the rock body around the tunnel anchor through the ge-ological situation of the anchor structure,FLAC3D finite element software was used to establish homogeneous and inhomo-geneous perimeter rock tunnel anchor model for calculation and analysis.Calculation results show that:the existence of weak interlayer will affect the stability of the rock body during the construction stage of the tunnel anchor;the anchor plug body through the weak interlayer will lead to a decrease in the uniformity of the tunnel anchor's overall share of the ten-sion of the main cable,thus leading to a decrease in the overall load-bearing performance;the weak interlayer itself will change the damage form of the tunnel anchor itself,affecting the development trend of the plastic zone of the rock body a-round the tunnel anchor.
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