Beijing-New Expressway

Essential information：

Today, the longest desert expressway in the world, Jingxin Expressway, has a total mileage of about 2768 kilometers. It crosses three deserts in Inner Mongolia Autonomous Region, namely Ulanbuhe, Tenggery and Badain Jilin. It is the largest single highway construction project in Asia and the second highway connecting Xinjiang and the mainland after Lianyungang-Holgus Expressway (G30). On July 15, 2017, Beijing-New High-Speed Inner Mongolia Linhe-Baiji Section, Gansu Baiji-Mingshui Section and Xinjiang Mingshui-Hami Section were jointly opened. Since then, the Beijing-New High-Speed Line has been running through. Beijing-New Expressway connects Beijing, Hebei, Shanxi, Inner Mongolia, Gansu and Xinjiang. City). The Linbai section is 930 kilometers long, the Baiming section 134 kilometers long and the Mingha section 178 kilometers long. Most of them are located in the Gobi and desert areas, and the construction conditions are very difficult. However, in the past five years, the participating units have overcome the difficulties of harsh environment, short effective construction period and heavy construction tasks, and successfully completed the tasks during the construction period. Beijing New High Speed has brought great benefits to the society. For the people along the line, the construction of Beijing New High-speed Railway has greatly improved their lives. During the construction of expressway, Alashan, located in Inner Mongolia Autonomous Region, built 935 kilometers of new infrastructure such as electricity, communication and 458 kilometers of water supply pipeline project. More than 2,000 jobs have been added to the area since the opening of the train. For the development of cities along the route, relying on the new high-speed Beijing, which runs across the East and west, mineral resources, tourism and other resources in the hinterland of the deep desert can be quickly transported to all parts of the country. It is reported that Majunshan Town in Gansu Province, located in Baiming Section of Beijing-New Expressway, is planning to develop tertiary industry tourism and fine processing industry to build an industrial base. But in the past, it took only three or four hours for herdsmen to travel along the dirt road in Majingshan Town. The road construction brought opportunities for local development. In addition, as far as China's overall economic development is concerned, the Beijing-New Expressway is the seventh radiation in the planning of the expressway network, opening up the fastest sea passage from the port of Horgos to the port of Tianjin. At the same time, the Beijing-New Expressway has shortened the distance between Beijing and Urumqi by nearly 1300 kilometers, which has significantly saved the cost of freight transportation. Since the 18th National Congress, China's expressway industry has developed steadily, and the framework of expressway network has been formed in general. On July 28, the Ministry of Transport announced that in the first half of this year alone, 11 expressway projects and 46 new projects have been built in China, among which the Beijing-New Expressway is a representative project. It is reported that by the end of 2016, the national highway mileage has reached 131,000 kilometers, ranking first in the world, covering more than 200,000 cities with a population of cities and towns. It is expected that by the end of the 13th Five-Year Plan, the main line of the national expressway will be basically connected. At that time, the expressway will further promote the economic development of our country, the flow of resources between regions, and people will travel more smoothly and conveniently through the highway.

Construction History：

Beijing Section: The 5th Ring Road to Beiqing Road was opened on December 31, 2011, the 6th Ring Road to Beiqing Road was opened on May 24, 2014, and the 6th Ring Road to Deshengkou was opened on November 2009. Half of the section from Deshengkou to Mijiabao Bridge was opened in November, 2009 (temporary freight dedicated line). Half of the section from Beijing has not yet started construction, and the section from Mijiabao Bridge to Hebei Province has been opened.

Hebei Section: Opened to traffic on April 23, 2019.

Shanxi Section: Opened to traffic on April 23, 2019.

Inner Mongolia Section: Opened to traffic on April 23, 2019.

Gansu Section: Opened on July 15, 2017.

Xinjiang Section: Opened to traffic on July 15, 2017.

The planned route consists of the former main line Danla from Beijing to Linhe section, the national key highway Dandong to Irkstan from Linhe to Hami section, and the former main line from Hami to Urumqi section. Among them, the Hushi-Linhe section and the G6 Beijing-Tibet high-speed heavy line, the Hami-Urumqi-Urapur interchange and the G30 Lianhuo high-speed heavy line.

Difficulties in Construction：

Difficulties in Construction With the gradual increase of expressway construction scale in mountainous areas in China, the number of large cross-section, long-span and extra-long tunnels is also increasing. The construction technology of such projects is difficult and the safety risk is high. Jinpenwan Tunnel of Beijing-New Expressway under the construction of Zhongjiao Expressway is a super-long tunnel with large cross-section of grade V soft surrounding rock. Because of its large scale, poor geological conditions and difficulties in tunneling, the project has been appraised by the Ministry of Transportation as a pilot project for safety risk assessment of highway bridge and tunnel construction, and the overall risk level of construction safety has been assessed. Grade IV (extremely high risk) was assessed, and the difficulty of construction was identified as the third in the country. In the process of enlarging construction space with half-section middle-wall method, after the completion of the initial support construction of the tunnel, diseases such as cracking, block dropping, arch frame deformation, inverted arch bottom heave, collapse and roof fall often occur. After going deep into the buried section, excessive settlement occurs more frequently, and the danger of arch replacement caused by arch frame deformation intensifies the construction safety risk. Due to the influence of the construction period, the original design of the simple wall method (CD method) and the three-step method can not meet the construction requirements.

Solution：

Difficulties in Construction With the gradual increase of expressway construction scale in mountainous areas in China, the number of large cross-section, long-span and extra-long tunnels is also increasing. The construction technology of such projects is difficult and the safety risk is high. Jinpenwan Tunnel of Beijing-New Expressway under the construction of Zhongjiao Expressway is a super-long tunnel with large cross-section of grade V soft surrounding rock. Because of its large scale, poor geological conditions and difficulties in tunneling, the project has been appraised by the Ministry of Transportation as a pilot project for safety risk assessment of highway bridge and tunnel construction, and the overall risk level of construction safety has been assessed. Grade IV (extremely high risk) was assessed, and the difficulty of construction was identified as the third in the country. In the process of enlarging construction space with half-section middle-wall method, after the completion of the initial support construction of the tunnel, diseases such as cracking, block dropping, arch frame deformation, inverted arch bottom heave, collapse and roof fall often occur. After going deep into the buried section, excessive settlement occurs more frequently, and the danger of arch replacement caused by arch frame deformation intensifies the construction safety risk. Due to the influence of the construction period, the original design of the simple wall method (CD method) and the three-step method can not meet the construction requirements.

Impacts of Meaning：

G7 Beijing-New Expressway runs across Northeast, North China and Northwest China, also known as the "Three-North Street", with a total length of about 2739 kilometers. It is one of the seven Beijing radiation lines in the National Highway Network Planning. It is the most convenient road between Northwest Xinjiang and Hexi Corridor connecting Beijing, North China, Northeast and the eastern part of the mainland. A new overland road passage for Xinjiang has shortened the distance between Xinjiang and Beijing by more than 1000 kilometers, which can significantly save transportation costs.