The Largest Cross-section Highway Tunnel in China

January 11，G5 Chengdu-Mianyang Expansion Project of Beijing-Kunming Expressway（Hereinafter referred to as“Expansion Project of Chengdu-Mianyang Expressway”）Control works——Smooth completion of Ma'anshan Tunnel，It laid a solid foundation for the early completion and opening of the project.。Ma'anshan Tunnel is the first two-way eight-lane super-large cross-section tunnel in Sichuan Province.，It is also the largest excavation section highway tunnel under construction in China.。
The expansion project of Chengdu-Mianyang Expressway is about 125 kilometers long.，It is the first new eight-lane expressway in Sichuan Province.，It is invested and constructed by Chuangao Company affiliated to Shudao Group.。As the only tunnel in the project，Ma'anshan Tunnel starts from Qiyun Village, Fuxing Town, Zhongjiang County, Deyang City.，End at Longju Village, Xinzhong Town, Jingyang District, Deyang City，The total length is 890 meters；Maximum excavation width of tunnel 23.05 meters，Maximum excavation height 14.8 meters，Maximum excavation section 257.05 square meters，It is the largest excavation section of highway tunnel under construction in China at present.。

Construction Site of Ma'anshan Tunnel of Chengdu-Mianyang Expressway Expansion Project Map provided by CCTV Fashudao Group

It is understood that，Since the commencement of construction of Ma'anshan Tunnel，Combined with the characteristics of poor surrounding rock and large excavation span of the tunnel, the participating units，Double side heading method and central partition method are adopted for construction.，IntroductionBIM+GISTechnology runs through the whole process of engineering construction.，Application of distributed optical fiber implanted nerve sensing system and micro-displacement sensing system，Replacing traditional monitoring means and intelligent management platform，Realization of all-weather 3D visual model management for tunnel construction。At the same time，During the construction of Ma'anshan Tunnel, big data technology is also used to intelligently analyze and process the monitoring data.，To realize the dynamic design and safety early warning and prediction of the tunnel、Purpose of full-cycle management and control of safety risk，The tunnel runs through horizontally、The longitudinal error is controlled within 5 mm.，It has accumulated valuable experience for similar tunnel construction in the industry in the future.。

With the help of scientific and technological means，The construction of Ma'anshan Tunnel has been accelerating.。The Ma'anshan Tunnel started construction on June 26, 2021.，The right hole was successfully completed on September 15, 2022.，120 days ahead of schedule；The left hole was successfully completed on January 11, 2023.，150 days ahead of schedule。

It is reported that，Chengdu-Mianyang Expressway Expansion Project is the third expressway between Chengdu and Mianyang.，It is the first urban viaduct with a continuous length of 40 kilometers in Sichuan.、Expressway with two-way eight-lane technical standard，After opening to traffic, it will become the highest technical standard in Chengdu-Deyang-Mianyang Passage.、A fast and convenient passage with the shortest mileage。The project is located in the core area of economic development in Sichuan Province.，It is to boost the overall integration of Sichuan.“The Belt and Road”The accelerator of construction，It is the main artery of the north-south interconnection in the west.，It is also an important support for the strategy of Chengdu-Chongqing economic circle.。

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