11月27日，中铁二十局几名工人在大梁隧道内进行排水作业。 Nov. 27,China railway bureau of 20 a few workers in the girder tunnel within the drainage operation.

    兰新铁路第二双线大梁隧道和祁连山隧道穿过祁连山腹地，施工区域位于青海省门源县和甘肃省山丹县境内，工点平均海拔为3500米～4345米，隧道经过地段地形复杂，线路经过地段多为无人区，高寒缺氧、气候恶劣，交通极为不便。这里地质条件复杂，大梁隧道高地应力引起的软岩大变形和祁连山隧道的碎屑流都是隧道史上的世界级难题。进入冬季，仍有近千名铁路工人奋战在祁连山深处，为隧道掘进攻坚克难。目前，两条隧道挖掘工程进展顺利，预计将于2013年年底贯通。新华社记者 聂建江 摄 LanXin railway second double girder tunnel and qilian mountain tunnel through the hinterland of qilian mountain,Construction area in qinghai province doors sources county in gansu province and ShanDanXian territory,Worksite an average elevation of 3500 meters to 4345 meters,Through the tunnel of complex terrain,Line after lot more for no man's land,chillness/weather,Traffic extremely inconvenient.This complex geological conditions,Girder tunnel high geostress caused by large deformation of soft rock and qilian mountain tunnel debris flow are tunnel in the history of world class problem.Enter winter,There are still nearly railway workers fighting in the depths of qilian mountain,For tunneling crucial grams difficult.At present,Two tunnel excavation goes well,Is expected to be at the end of 2013 through.Xinhua news agency reporters NieJianJiang perturbation

11月27日，中铁二十局几名工人在大梁隧道内进行排水作业。 Nov. 27,China railway bureau of 20 a few workers in the girder tunnel within the drainage operation.新华社记者 聂建江 摄 Xinhua news agency reporters NieJianJiang perturbation

    11月27日，参与大梁隧道施工的中铁二十局工人蔡波（右）在施工点的医疗室内吸氧。     Nov. 27,Participate in girder tunnel construction of China railway bureau CaiBo twenty workers(right)In ShiGongDian medical indoor oxygen.新华社记者 聂建江 摄 Xinhua news agency reporters NieJianJiang perturbation

这是穿过祁连雪山的大梁隧道外接桥梁（11月27日摄）。 It is through the qilian snow mountain of girder tunnel external bridge(Nov. 27 perturbation).新华社记者 聂建江 摄 Xinhua news agency reporters NieJianJiang perturbation