The rise of nanometers

Although Academician Wang Mengshu, Zhang Tianwang and others have made preliminary plans, the people in charge in Haikou and Zhanjiang are still a little worried.

After all, the undersea tunnel crosses three seismic zones. Once a super strong earthquake occurs, stratigraphy is prone to dislocation.

The person in charge of Haikou asked in a low voice: "Academician Wang, Dr. Zhang, if there is a super strong earthquake, will the tunnel be torn apart?"

Zhang Tianwang explained patiently: "Don't worry, the ground dislocation caused by the earthquake will at most cause the tunnel to shift. However, because the tunnel adopts an integrated design, it will not tear the tunnel itself, and there are double pipelines. Even a magnitude 9 earthquake will be very difficult." It’s difficult to tear the first layer of pipes.”

"But just in case..."

Academician Wang shook his head: "If the first layer of pipes is torn and the inner pipe of the second layer is still there, the possibility of both layers being destroyed at the same time is close to zero."

"I have done supercomputer simulation calculations for super highways. Even if the displacement is hundreds of meters, it can be resisted by relying on the integrated design and its own strength." Academician Li Fen explained.

In fact, not to mention stratigraphic changes of hundreds of meters, even stratigraphic displacements of more than ten meters are very rare in earthquakes.

On the contrary, it is easy for large-scale mountain collapses to occur on the surface. That is because there is no stratum around the mountain to squeeze together. Under the devastation of seismic waves and the influence of gravity, collapses are easy to occur.

Within the strata, it is often not easy for large displacements to occur, because they are squeezed together, making it difficult to produce large displacements.

This is like standing alone on a bus or crowded with a group of people. If the bus brakes suddenly, one person may fall, but a group of people is unlikely to fall.

As long as you avoid some easily fractured strata when planning the tunnel route, you can actually avoid a lot of dangers.

The concerns of the people in charge of the two places are actually that they do not understand the earthquake resistance principle of the integrated tunnel.

Why are it often difficult for many modern buildings to ensure their integrity during a major earthquake?

The first reason is naturally that the materials are not good. The overall strength of reinforced concrete cannot withstand the high-frequency vibrations of earthquakes. However, the nanocomposite material formed by ferrosilicon nanowires and silicate-sodium chloride has a strength of 3.4 times that of reinforced concrete. ~3.6 times.

This is like the comparison between ordinary glass bottles and silicon nano glass bottles. There is a huge difference in strength between the two.

The second reason lies in the design.

Ordinary buildings often include three parts: foundation, frame, and infill wall. Moreover, the internal combination of the frame is not completely connected in one piece. It is usually spliced ​​together layer by layer.

Many people have played with Lego bricks. To put it bluntly, modern architecture is an enlarged version of Lego bricks. Even underground tunnels are also made of building blocks.

This kind of building block building is in a naturally weak position when it comes to resisting vibrations.

The integrated building made of new materials is, to a certain extent, like a piece of iron.

In fact, you can do a comparative experiment, using building blocks and glue, and directly using plastic mesh and epoxy resin to create a pipe with the same diameter. Under the same high-frequency vibration, the pipe made of building blocks will definitely not be as good as plastic. Mesh and epoxy.

After understanding the details, the responsible persons in both places felt relieved.

In a temporary conference room on the beach in Haian Town, a group of experts and scholars were discussing enthusiastically. They did not reach an agreement on the route of the undersea tunnel in the Qiongzhou Strait.

During this discussion, the time came to the lunch point unknowingly, and people from Xuwen County arranged lunch for everyone.

Lin Baijie and Jiang Hailin looked at the pineapple fried rice, pineapple sweetened pork, and pineapple juice in front of them, and their stomachs became sour involuntarily.

The person in charge of Xuwen County, seeing everyone's expressions of embarrassment, explained with some embarrassment: "Xuwen pineapples are unsaleable this year, so our county will help digest some."

"I understand, I understand." Lin Baijie took a few bites of pineapple fried rice, and then said, "How much does a pound of pineapple cost this year?"

“It’s only one yuan per kilogram, and there aren’t many dealers to collect it.”

Jiang Hailin on the side was surprised: "Although the annual output of pineapples in Xuwen is quite high, I saw the industry research report of Fengmin Agriculture and it said that we also purchased a lot of pineapples from Nanbo Bay? Why are Xuwen pineapples unsaleable?"

The person in charge of Xuwen County smiled bitterly and said: "Those fruit shops say that the pineapples in Nanbo Bay are called pineapples, so the sales are very good. Our own ones are called pineapples, and we can't sell two for one dollar."

"Pineapple? Pineapple? Is there a big difference?" Jiang Hailin asked in confusion.

The person in charge of Xuwen County shook his head: "The two are the same thing, with only some different varieties, such as Bali and golden pineapples."

After eating half a plate of pineapple fried rice, Lin Baijie smiled and said:

"It's really good to eat pineapple once in a while. If you eat it often, you can't stand it. I'll call Lao Xiao from Fengmin later and ask him to arrange cold chain trucks and cold chain cargo ships. Anyway, this year's longan and lychee are going north. , adding a pineapple is not a big problem.”

Jiang Hailin nodded: "That's true. Xuwen's annual output of pineapples is 700,000 tons, which is not enough for everyone in the country, not to mention that it is not listed in a centralized market."

"On behalf of the fruit farmers, I would like to express my gratitude to Mr. Lin and Mr. Jiang." The person in charge of Xuwen County was very excited. After all, the unsaleable fruits in the county have always been a local worry.

After lunch, Academician Wang, Zhang Tianwang and others continued to discuss the undersea tunnel route in the Qiongzhou Strait.

There are currently seven planned routes, among which the shortest one is from Xuwen Haian Town to Qiongzhou Haikou, with a length of only 19.5 kilometers.

The distance of this line is short, and the construction cost is only about 6.5 billion.

But the opposition is the loudest, because the Hai'an-Haikou line has the most concentrated seismic zones, and Haikou's geological conditions are not good.

Although the cost is cheap, it is not worth the gain to save money temporarily and leave potential safety hazards in the future.

Zhang Tianwang pointed to the exploration map and said: "From a geological and construction perspective, Line 4 is the best choice."

Line 4 is from Weijiao Township in Xuwen to Leigong Island in Lingao.

"Line 4 is indeed better, but it is a little too long, reaching 33 kilometers and costing about 10.8 billion." Academician Wang was also hesitant.

After repeated consideration, everyone finally chose the safest line 4, taking Weijiao Township in Xuwen to Leigong Island in Lingao County.

As a cooperative party, Suiren Department signed a strategic cooperation memorandum with Zhanjiang and Qiongzhou, in which Suiren Department invested 4 billion and has a 12-year toll operation period for the undersea tunnel.

After determining the route, the next step is to design the details, conduct more in-depth field exploration, prepare a planning and construction plan for the undersea tunnel, and then submit the project for approval.

Originally, this tunnel was only intended to carry railways, but with the addition of the Suiren system, it was changed to a mixture of roads and railways, and the cost did not increase too much.

After all, the Seikan Tunnel built by the Japanese is a living reference.

After signing the memorandum of cooperation, Lin Baijie and Jiang Hailin communicated with Xiao Yuan of Fengmin, asking the other party to arrange personnel as soon as possible to settle in Xuwen County, purchase pineapples, lychees, and longans, and transport them to the north through cold chain for sale.

Upon hearing this, Xiao Yuan immediately sent someone over.