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正在施工的宝成线二线,沿线工程地质复杂,全线约31座隧道通过围岩软弱、埋深较浅、岩层破碎地段,占隧道总座数55％,总延长米约1.5万米,锚喷支护为设计中重要的支护措施。明月峡隧道进口段为双线喇叭口,工程地质条件差,紧靠原有线路浅埋,岩石破碎,隧道开挖跨度达16米。针对这座隧道的特殊性,为保证施工和原有线运营的安全,铁道部第二勘测设计院,大胆采用了具有国际领先水平的自进式(迈式)锚杆系统。
Under construction Baocheng second line, along the project geological complex, across the board about 31 tunnels through the soft rock, shallow depth, the rock fragments, accounting for 55% of the total number of tunnels, the total extension of about 15,000 meters meters, anchor spray Support for the design of the important support measures. Mingyue Gorge tunnel entrance for the two-wire bell mouth, poor engineering geological conditions, close to the original shallow line, rock crushing, tunneling span of 16 meters. In view of the particularity of this tunnel, in order to ensure the safety of the construction and operation of the original line, the No. 2 Survey and Design Institute of the Ministry of Railways has boldly adopted the advanced self-propelled (maiden) bolt system with international advanced standards.