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成渝高速公路上的中梁山、给云山两座隧道建成通车，标志着我国公路隧道建筑技术有了长足的进步。这两座双车道单洞总长11000多米的隧道，所处地段水文地质情况复杂，L程难度较大。但在参加建设的设计、施工、科研、监理人员和广大职工的共同努力、协作配合下，战胜重重困难，
Zhongliang Mountain on the Chengdu-Chongqing Expressway, opened to traffic two tunnels Yunshan, marking China’s highway tunnel construction technology has made great strides. The two double-lane single-hole total length of more than 11,000 meters of tunnels, where the location of the hydrogeology complex, L-Cheng more difficult. However, to participate in the construction of the design, construction, scientific research, supervision and staff members and the joint efforts of workers, with the cooperation, to overcome numerous difficulties,