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| Model test study on seismic performance of fiber reinforced concrete lining applied at the interface section of soft and hard surrounding rock of tunnel
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| CUI Guangyao1，SONG Bohan1，WANG Daoyuan2，3，XIAO Jian4 |
| (1. School of Civil Engineering，North China University of Technology，Beijing 100144，China；2. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3. Department of Civil Engineering，Hebei Jiaotong Vocational and Technical College，Shijiazhuang，Hebei 050091，China；4. MCC Communication Construction Group Co.，Ltd.，Beijing 100011，China) |
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Abstract In order to improve the seismic safety of interface section of soft and hard surrounding rock of the tunnel in the high intensity earthquake area，the seismic performance of the fiber reinforced concrete secondary lining is studied based on the tunnel project of Urumqi Metro Line 1. Using the method of shaking table model test，the research of this paper is completed，and the research results are as follows. The structural safety of tunnels in hard rock is mainly controlled by the movement interaction between surrounding rock and lining，while that in soft rock is controlled by the seismic inertia force and the movement interaction between surrounding rock and lining. The strength and toughness of the lining structure are improved by the fiber reinforced concrete secondary lining. Because of the small increase of the seismic inertia force borne by the tunnel structure in hard rock，and the movement of surrounding rock and lining is not improved obviously，the minimum value of the structural safety coefficient increases greatly，and the maximum increase percentage reaches 71.40%. After using fiber reinforced concrete lining in soft rock，the effect of the lining structure to resist larger earthquake inertia force is significant. At the same time，the movement interaction between surrounding rock and lining is enhanced. The minimum increase percentage of structural safety factor is smaller than that in hard rock，and the maximum increase percentage is 29.11%. Considering the seismic peak acceleration，longitudinal strain，contact stress and structural internal force，the seismic performance and structural safety of steel fiber reinforced concrete are better than that of basalt fiber reinforced concrete under the condition of the same volume of fiber. The research results can provide reference for the improvement of seismic performance of traffic tunnels in mountainous areas with strong earthquakes.
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2021, Vol. 40 
