A brief introduction to Humaling Tunnel

1. Where is the Humaling Tunnel? 2. Why is the Humaling Tunnel not dug into the mountain? 3. Why can’t the Humaling Tunnel be open to the air? 4. How difficult is the Humaling Tunnel? 5. Lanyu-Chongqing Railway Humaling Why didn’t the tunnel explode? 6. Which tunnel was Feng Bang talking about? Where is the Humaling Tunnel?

The junction of Yuzhong County, Lanzhou City, Gansu Province and Weiyuan County, Dingxi City.

Humaling tunnel is one of the special long tunnels of the Lanzhou-Chongqing Railway. It is located at the junction of Yuzhong County, Lanzhou City, Gansu Province and Weiyuan County, Dingxi City. The tunnel starts from Longquan Township, Yuzhong County It leads from Wujiazhuang Village, passes through the main peak of Humaling and Heishan Township where Humalingliang is located, and ends at Baitupo Village, Qinqi Township, Weiyuan County.

The total length of the tunnel is 13.61 kilometers, passing through a reservoir and a river. 3.25 kilometers of it pass through the Tertiary saturated water-rich silty fine sand formation, forming numerous water pockets of varying sizes. Affected by construction disturbance, the surrounding areas Rock liquefaction is very serious, and safety hazards such as water and sand inrush have become prominent, which has seriously affected the construction progress. The remaining 3.5 kilometers of the project are listed as "a rare and world-wide problem in China" and the "number one most important and difficult project" on the entire road. Tunnel excavation has been smooth in the first three years since construction started in March 2009, with nearly 100 meters of tunneling being advanced every month. The "tofu soil layer" began to be solved in August 2011, and the average progress could only be four to five meters a month. By 10:30 a.m. on June 19, 2017, the tunnel was officially completed.

The completion of the Humaling Tunnel has laid a solid foundation for the opening and operation of the Lanzhou-Chongqing Railway, and has also accumulated valuable experience for the construction of long tunnel railways in my country and even the world under the conditions of rich water, powder and fine sand. . Why is the Humaling Tunnel not excavated?

The reason why the Humaling Tunnel is not excavated: The Humaling Tunnel passes through the Loess Plateau. This area is rich in fine and soft loess particles, which are easily deformed by rain erosion and produce collapsible loess. . This type of soil will cause tunnels that have just been excavated to sink and break. At the same time, the surrounding rock structure in the tunnel is mainly composed of mudstone, sandstone intercalated with mudstone, and conglomerate. They all belong to Class IV and V surrounding rocks and are the group of surrounding rocks with the worst stability and the highest risk factor. After comprehensive consideration, the construction difficulty of the Humaling Tunnel has been characterized by experts and academicians from all sides as "a rare domestic problem and a difficult problem in the world." Why can’t the Humaling Tunnel be open to the public?

Protect the tunnel. Humaling Tunnel is one of the special long tunnels of the Lanzhou-Chongqing Railway. It is located at the junction of Yuzhong County, Lanzhou City, Gansu Province and Weiyuan County, Dingxi City. Its tunnel is a typical loess tunnel. The biggest difference between it and the rock tunnel is that it is eroded by rain. It is extremely easy to deform and collapse. In order to protect the tunnel, it cannot be exposed to the open air. It is a very good building. How difficult is the Humaling Tunnel?

The Humaling Tunnel crosses the Loess Plateau and is located in a collapsible loess terrain, making the project very difficult. The Humaling Tunnel is a typical loess tunnel. The biggest difference between it and a rock tunnel is that it is easily deformed and prone to collapse after being eroded by rain. After the tunnel is excavated, it will converge and settle, which can easily cause damage to the tunnel after it has just been excavated and has not yet been reinforced. The tunnel deforms, sinks and cracks.

The Humaling Tunnel has complex geology and extremely difficult construction. It has been characterized as a "rare domestic and world-wide problem" by experts and academicians from all walks of life, and the construction safety risks are high. The Lanzhou-Chongqing Railway is a "hard nut" in the history of my country's railway construction. The entire line crosses 10 regional major fault zones, 87 major faults, and multiple "Tertiary water-rich, powdery and fine sand" strata. It is a very difficult, High risk railway.

The 13.6-kilometer-long Humaling Tunnel, constructed by the 19th Bureau of China Railway Construction, is a typical representative of the difficult and difficult projects on the thousands-mile Lanzhou-Chongqing Line, and is also the last tunnel on the entire line.

The construction of Humaling Tunnel began in March 2009. In the first three years, tunnel excavation went smoothly, with nearly 100 meters of tunneling being advanced every month. On August 19, 2011, the tunnel construction suddenly encountered the "Tertiary water-rich fine sand" formation. The gushing mud and sand flooded the repaired tunnel like a debris flow. The tunnel project did not advance, but went backwards.

After that, the tunnel operation was like "drilling a hole in the brain", and no modern machinery could do anything. The entire construction was like a "tug of war", digging, submerging, and digging again, and the progress was extremely slow. It is this 3,480-meter-long "Tertiary water-rich fine sand" formation that has caused several top tunnel construction teams in China and the world to fail.

German experts once brought their own equipment and construction teams to Humaling to take on the challenge. They tried several times but failed. When they evacuated, they believed that "it is impossible to build a tunnel in this formation." Carlos, chairman of the International Association of Engineering Geology and Environment, visited the construction site twice for investigation. Domestic and foreign academicians and experts came to the site for analysis and guidance in 38 batches, and identified the geology of the Humaling Tunnel as "rare in China and a difficult problem in the world."

In order to solve the problem of the Humaling Tunnel, the Lanzhou-Chongqing Railway Company organized relevant scientific research institutions, universities, design and construction units to jointly carry out scientific research and research, and invited many top experts and academicians in the tunnel industry at home and abroad for consultation. Research and optimize construction plans.

Finally, new technologies and processes such as "double side wall nine-step excavation method", "CRD six-step excavation method", "vacuum dewatering", "double liquid retreat splitting grouting" and so on were adopted. Effectively overcome the flooding of water and sand, ensuring the smooth penetration of the tunnel.

The above content refers to People's Daily Online - The Lanyu Railway Humaling Tunnel successfully penetrated the Lanyu Railway. Why was the Humaling Tunnel not blasted to the ground?

Why was the Lanyu Railway Humaling Tunnel not blown flat? Flatten? Answer: The Humaling Tunnel of the Lanzhou-Chongqing Railway is prone to landslides and the terrain is dangerous. So it won't be blown flat. Which tunnel is Feng Bao talking about?

Feng Bao is talking about the No. 2 Humaling Tunnel. Peak Burst tells the story of the Humaling Tunnel, a tunnel that has been under construction for ten years and is about to be completed. Affected by global geological changes, a series of geological disasters such as ground fissures, earthquakes, landslides, and mudslides hit the Humaling Tunnel, affecting 160,000 people in Yunjiang County. People face life and death.

The whole film has a tight rhythm, exciting emotions and orderly sequence. The story begins with Yundang Mountain in January. The trees are lush, the market is bustling with traffic, and the train is slowly entering the station. Next to the track are fruit and vegetable stalls lined up one after another, with a dazzling array of displays, full of the fireworks of the human world.

The warmth in front of the screen was still lingering in front of the audience. The sudden landslide instantly destroyed the peace in the thick smoke, and was replaced by wailing and mess on the ground. The rhythm of this section is handled appropriately, allowing the audience to immediately go directly to the disaster scene, creating a sense of immersion, and walking from the human fireworks into the disaster relief scene.

During the movie viewing process, you can see shocking visual effects such as a hundred-meter underground river and ten-story mountain steps. You can only get in and out of narrow places. In this cave, there is the thrilling rescue of people by Lao Hong's car, the argument between Lao Hong and Xiao Hong's father and son for love and mutual redemption, and everyone's perseverance and calm analysis of the plot, a series of emotions that come and go in one go.

The small group in the cave is still anxious about finding an exit. The frontline infrastructure workers outside the cave have gone from protecting the tunnel to willing to blow up the tunnel. They have decided to sacrifice the tunnel they have built for ten years to protect 160,000 people. This wave of Humaling leads to the excitement and enthusiasm of their emotional changes.