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| Research on the New Shed Tunnel Structure in High - speed Railway Tunnel Portal of Mountain Area |
| SHI Xian – wei |
| (China Railway First Survey and Design Institute Group Co. Ltd，Xi’an，Shaanxi 710043，China) |
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Abstract Abstract : Research purposes : The purpose of this paper is to study the rockfall protection of the high speed railway tunnel entrance in the mountainous area，which is an important factor restricting the safe operation. This paper is based on the high - speed railway project from Xi an to Chengdu，combined witli terrain features，proposes two new types of shed structure of the integration of flexible steel net shed tunnel tunnel，column and beam supported reinforced concrete shed，and analyzes their characteristics，puts forward the applicable conditions. Research conclusions ：( 1) Column and beam supported reinforced concrete shed tunnel superstructure has large self - weight，need to set the foundation alone，and has complex process， construction difficulty，large investment，but good durability，lowmaintenance cost，when the elevation difference between the surface of the orbit and the ground is higher， the detailed analysis and calculation of the high seismic zone must be carried out. (2) The integration of flexible steel net shed tunnel can be integrated with the bridge， the utility model has the advantages of convenient manufacture and installation，beautiful appearance，but has the disadvantage of poor durability of steel， the need for regular anti rust treatment and high maintenance costs. (3)The elevation difference between the surface and the center of the channel is an important factor influencing the selection of two new types of shed tunnel，when the height difference is less than 15 m，the column and beam supported reinforced concrete shed is prefered. (4 ) The research results can be widely used in rockfall protection of railway tunnel portal.
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Received: 02 May 2017
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2017, Vol. 34 
