The chenglan railway tunnel, which took 74 months to build, was completed on Thursday, according to chenglan railway co., LTD. The tunnel is located in guangming town, MAO county, aba prefecture, sichuan province. It passes through the core of the active fault zone behind longmen mountain, with a length of 9,913 meters.

Reporters learned that maoxian tunnel through three faults, two anticlines, a syncline, the construction process by high stress, wenchuan earthquake aftershocks significantly. With active faults of rupture and displacement, ensure the tunnel structure not to undermine, ChengLan railway company organization expert argumentation, many times to carry on the field test, spine was inspired from animals, with short segmental wide juncture, gives the ability to adapt to movement and rotation tunnel, at the same time, strengthen the structure design and surplus reserve space, and thus do & other; The structure is safe, economical and easy to repair ” .

Maoxian county tunnel by China railway 17 bureau construction, according to relevant controller introduces, fracture of the activity, tectonic extrusion, surrounding rock broken, powder, the original high in-situ stress, the tunnel suffered serious extrusion deformation, maximum deformation of 190 cm, vault subsidence value reached 78 centimeters, the deformation of railway tunnel under construction in the country.

According to the introduction, in the 74 months of construction time, the builders have been overcome technical problems, repeated tests to verify the summary of the. Large deformation control technology of soft rock with high ground stress in chenglan railway ” It has been promoted nationwide and applied for 16 utility model patents, forming 5 provincial and ministerial construction methods, which has accumulated valuable experience for the construction of soft rock tunnel in southwest China.

The chengdu-lanzhou railway starts from chengdu, goes through guanghan, shifang, mianzhu, MAO county and songpan to jiuzhaigou, and then extends to the north. The railway is designed to run along passenger and cargo lines at 200 kilometers per hour. Upon completion of the project, it will put an end to the lack of railway access in western sichuan, and together with baocheng railway, lan-yu railway, sichuan-tibet railway and chengdu-xi (ning) railway, it will form a trunk railway channel connecting northwest, southwest and south China coast, and form the second overland railway channel from chengdu to Europe and Asia.