Study On Bearing Capacity And Seismic Performance Of Steel-basalt Hybrid Fibers Reinforced Concrete

With the arrival of underground engineering and tunnel engineering,the related problems of the anti-seismic are constantly emerging.After the Wenchuan earthquake,it is found that the earthquake damage in the high intensity area is extremely serious.In order to meet the support and anti-seismic demand of the weak surrounding rock tunnel,promote the application of steel fiber and basalt fiber in underground engineering,this paper studied static performance and dynamic performance of the steel-basalt hybrid fibers reinforced concrete(SBHFRC)by using related tests.the anti-seismic fortification measures for SBHFRC lining are put forward.In addition,this paper puts forward the seismic fortification measures for SBHFRC lining to achieve the purpose of anti-seismic.From the theoretical analysis and basic mechanics test,this paper researched SBHFRC’s compressive properties,shear resistance,toughness properties.The results show that the mechanical properties of the concrete are improved to some extent after the incorporation of the steel-basalt hybrid fiber,and the toughening effect is the most obvious.In order to find out whether the tunnel support capacity can be improved by using SBHFRC lining,this papar carried out the proportional model test.The test show that the toughening effect of SBHFRC greatly improves the bearing capacity of tunnel lining;In order to realize the seismic demand of tunnel engineering,the seismic performance of SBHFRC lining is studied by numerical simulation.The results show that the seismic performance of SBHFRC is excellent.In order to further reduce the seismic damage and improve the seismic performance of the tunnel lining,this paper puts forward the anti-seismic measures of deep grouting and the measures of the damping measures.Through the numerical simulation results,it can be found that the effect of deep grouting is better than that of contact grouting.The staggered seam and the conventional seam can effectively reduce the shock,but the effect is basically the same.The research results can provide some reference for the design and construction of fiber reinforced concrete lining structure.