Abstract：Research purposes: According to the medium and long － term railway network planning of China，the sixteen thousands kilometers of passenger dedicated rail line will be built． So lots of bridges and tunnels will be built for the high － speed railway in the mountain areas of the Midwest of China，with bridge connecting with tunnel and forming group． The high － speed train running on such railway requires high safety and the passenger needs ride comfortableness． So it is necessary to study whether the safeguard structure is installed on the bridge or not and what kind of the safeguard structure should be used when the open track between tunnel portals is short due to the limitations of thetopographic condition and the railway alignment．
Research conclusions: ( 1) When the distance between the adjacent portals of two tunnels is more than 250 m，the two tunnels may be considered as independent ones． When it is less than 250 m，the pressure fluctuation produced by a train passing through the tunnels will be interacted． The variation of maximum pressure in 3 s can be reduced by the safeguard structure． In this way，the visual fatigue of passengers caused by the " black tunnel" and " white tunnel" due to frequently passing in and out tunnels of train can be relieved． ( 2) Using safeguard structure along with the safeguard protection on the side slope，the threat to the operation safety from the falling stone with small grain size can be effectively protected when the slope surface at the tunnel portal is high and precipitous． ( 3) The flexible net steel safeguard structure can be used for the connecting safeguard structure with the features of high safety，reliability and money saving and it can be used in the actual engineering after doing the rock falling impact test．
张 剑. 山区高速铁路隧道间桥隧连接结构探讨[J]. 铁道工程学报, 2011, 28(8): 62-67.
ZHANG Jian. Discussion on Connection Structure of Bridge and Tunnel between Tunnels of High － speed Railway in Mountain Area. 铁道工程学报, 2011, 28(8): 62-67.
Mei Yuangui． Research of Aerodynamics Problem of Long and Large Tunnels on Mountain Area Passenger Dedicated Railway: the Effect of Distance between Densely Tunnels to Comfort and Countermeasure Research［R］． Lanzhou: Lanzhou Jiaotong University， 2009．
China Railway First Survey and Design Institute Group Ltd． Design Explanation of Tunnel on Xi ’an to Jiangyou Section ( in Shannxi Province ) of Xi ’an to Chengdu Passenger Dedicated Railway ［R］． Xi ’an: China Railway First Survey and Design Institute Group Ltd，2010．
［3］ 王玉锁． 柔性棚洞落石冲击计算［R］． 成都: 西南交通大学，2011．
Wang Yusuo． Calculation of Rockfall Impact of Shed Tunnel with Flexible Protection System ［R］． Chengdu: Southwest Jiaotong University，2011．
Wei Tao． Computing Result list of the Steel Shed Tunnel with Flexible Protection System between Small Spacing Tunnels on Xi ’an to Chengdu Passenger Dedicated Railway［R］． Chengdu: Southwest Jiaotong University，2011．
China Railway First Survey and Design Institute Group Ltd， Wei Tao． Design Explanation of Protective Structure and Tunnel Opening Parallel － heading Relief well between Small Spacing Tunnels on Xi ’an to Jiangyou Section ( in Shannxi Province ) of Xi ’an to Chengdu Passenger Dedicated Railway ［R］． Xi ’an: China Railway First Survey and Design Institute Group Ltd，2011．
China Academy of Railway Sciences． Test of aerodynamic effect in tunnels on Wuhan to Guangzhou passenger dedicated railway ( phasic research report ) ［R］． Beijing: China Academy of Railway Sciences， 2009．
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Engineering Designing Identification Center of The Ministry of Railways of The People ’s Republic of China． Tunnel of High Speed Railway［M］． Bejing: China Railway Publishing House，2006．
［8］ TB 10621—2009，高速铁路设计规范( 试行) ［S］．
TB 10621—2009，Code for Design of High Speed Railway［S］．
Deng Jie，Yu Nanyang，Zhao Haihen． Study on the Adaptability of Effective Cross － section Area of the Tunnel of Beijing － Shanghai － speed High － soeed Railway［J］． Journal of Railway Engineering Society， 2010( 3) : 66 － 70．
2011, Vol. 28 
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