国内外特长山岭铁路隧道单、双洞长度分布特征研究

Statistics on Length Characteristics of Single-and Double-Tube Extra-longMountain Railway Tunnels in China and Abroad

为明确特长山岭铁路隧道单、双洞型式及其长度特征,对国内外310座特长山岭铁路隧道的实际工程案例进行统计分析,对比我国已建和在建特长山岭铁路隧道单、双洞的长度分布现状,并分析亚洲(除中国外)、欧洲国家特长山岭铁路隧道单、双洞的长度分布特征。研究表明:1)国内长度10 km<l≤15 km的特长山岭铁路隧道中,已建单、双洞隧道数量比为18∶1,在建隧道洞线型式基本选用单洞双线型式;2)国内长度15 km<l≤20 km的特长山岭铁路隧道中,已建单、双洞隧道数量比约为1∶1,在建单、双洞隧道数量比为20∶1;3)国内长度>20 km的特长山岭铁路隧道中,已建隧道洞线型式基本选用双洞单线型式,在建单、双洞隧道数量比为5∶2;4)截至2020年底,已建和在建特长山岭铁路隧道总数中,单洞隧道数量增长约30%,双洞隧道数量增长约1%;5)亚洲国家(除中国外)长度>20 km的特长山岭铁路隧道基本选用单洞双线型式,欧洲国家长度>20 km的特长山岭铁路隧道基本选用双洞单线型式。

To clarify the characteristics of single-and double-tube extra-long mountain railway tunnels,a statistical analysis is conducted on 310 extra-long mountain railway tunnels.The lengths of double-tube extra-long mountain railway tunnels built and under construction in China and those in Asian and European countries are summarized.Statistical results show the following.(1)For the extra-long mountain railway tunnels in China with a length of 10~15 km,the ratio of the single-to double-tube tunnels built is 18∶1,and the single-tube mode is the most popular in the tunnels under construction.(2)For the extra-long mountain railway tunnels in China with a length of 15~20 km,the ratio of the single-to double-tube tunnels built is approximately 1∶1 and that for the tunnels under construction is 20∶1.(3)For the extra-long mountain railway tunnels in China with lengths above 20 km,the double-tube single-track is commonly used in tunnels built,and the ratio of the single-to double-tube tunnels under construction is 5∶2.(4)By the end of 2020,considering the total number of the extra-long mountain railway tunnels built and under construction,single-tube tunnels have increased by approximately 30%,whereas double-tube tunnels have increased by approximately 1%.(5)The mountain railway tunnels in Asian countries(except China)with lengths above 20 km are single-tube double-track tunnels,whereas those in European countries are double-tube single-track tunnels.