All tunnels across the Guinan High -speed Railway are all connected

On August 17, it took 4 years to fight hard. At this point, the 108 tunnels of the Guinan high -speed railway are all connected, laying the foundation for the opening of the line.

The 90,000 Dashan Tunnel No. 4 Tunnel of the Guinan High -speed Railway is located in the Huanjiang Maoan Autonomous County, Guangxi. The total length of the tunnel is 15,485 meters. It is the longest railway tunnel through the fault and geological contact belt. First -level high -risk tunnel. The 90,000 mountains in the tunnel are one of the 7 world natural heritage areas of "Karster, South China". It can be called the "Karster Rock Constrained Geological Museum". The geological conditions are extremely complicated and the construction is extremely difficult.

The tunnel exit is a rare "charcoal shale to tease the floor". This shale contains carbonization organic matter. The thin layer of layers is like a pages and a certain tilt. It is easy to collapse. Common blasting excavation is very disturbing to the rock layer. It can only be used to use traditional rock drilling machines and excavators to dig and dig inch inch in one inch. The daily progress is only about 45 cm. The 682 -meter charcoal shale slowly tilted the section of the ground, and the builders dug a full 22 months.

During the tunnel mining process, there were 179 dissolved cavities of the cava, and an average of 86 meters was encountered every 86 meters. Due to the large dissolved cavity, the condition of the mud and the water often occurs. In the face of construction difficulties, the Guangxi Railway Guangxi Company organized the construction plan to optimize the construction plan of China Railway Eighteenth Bureau, strengthened advanced geological forecasting and monitoring quantities, and in accordance with the principles of "weak blasting, short -scale ruler, strong support, and diligence measurement". The rock exposed during the tunnel excavation was reinforced in time, and the steel arch was installed. Each meter was immediately poured with concrete to ensure the safety of the tunnel construction.

The 90,000 Dashan No. 4 Tunnel is located in the hinterland of Mao Nanshan Township. The local transportation infrastructure is relatively backward. Since the construction of the tunnel, when the railway department builds the construction road, combined with local economic development and transportation construction plan, more than 80 kilometers of roads and expansion roads are connected to more than 20 villages in Dashan to open up Maman Mountain Township to consolidate and expand poverty alleviation. Effective results are the "capillaries" that are effective in the village's revitalization and effective connection, which is convenient for nearly 5,500 local people to travel. During the construction process, they also give priority to recruiting local people to participate in railway construction, teach construction skills such as tunnels, jet anchors and cement mixing, and cultivate industrial workers in the new period. Local materials and construction equipment are 64.01 million yuan.

The Guinan high -speed railway runs through the northwest of Guangxi and southeast of Guizhou. It is the first high -speed railway with a design speed of 350 kilometers per hour in Guangxi. Up to now, the Guinan high -speed railway Guangxi section tunnel, road base, earth and rockfields, and main line bridge projects have all ended, and the overall progress of the station building project has completed nearly 40%of the total design. It is expected to be opened at the end of 2023. It will shorten the original 5 hours to about 2 hours.

Source: CCTV News Client

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