Shen Yan CaseThe article was originally created and published by the headline of the Shen Yan case. Please do not plagiarize or reprint itIn the construction market,The price of inconspicuous sand in the river channel once skyrocketedAlso known asSoft GoldHas become an important scarce resource in China

Shen Yan Case

The article was originally created and published by the headline of the Shen Yan case. Please do not plagiarize or reprint it

In the construction market,The price of inconspicuous sand in the river channel once skyrocketedAlso known asSoft GoldHas become an important scarce resource in China.

The annual carrying capacity of the Yellow River is astonishing, causing great trouble to the people along the way, evenThe sedimentation inside the Three Gorges Dam on the Yangtze River has become a major problem,Staff should always pay attention to the amount of sediment to prevent danger.

This leads to a question,Why not release the Three Gorges Dam and let people excavate it to make up for the scarcity of river sand in the market?

This sand is not Pisa

River sandRiver sandThe word difference also determines that the two cannot be confused.

'Sand' refers to mineral particles with small phasesDerived from the weathering of marine crustaceans and rocks, the most typical is the sand in the desert.

SandThere is not much difference in chemical composition from sand, but there are still slight differences in appearance. It was formed in the river channel,River sandIt belongs to a type of mineral resource.

River sandIt can be purified from river sandRiver sand

River sandMake the house more sturdy and durableIt is an excellent building material that is highly favored in the construction market.

River sandNot only can it enhance the strength of concrete, but it can also reduce the amount of cement used,River sand

How are the two different

So why can't sand be used? Are there any differences in chemical composition between the two?

Actually, the reason was already explained earlierMainly because the particles of sand are too smallRiver sand

EspeciallySea sand, with a high content, can accelerate the corrosion rate of buildingsThis poses significant safety hazards and is not a suitable building material.

River sandMachine-made sandSandIt belongs to a type of artificial sand.This type of sand is more regular than natural sand and allows architects to freely change the shape according to their needs.

This type of "artificial sand" can basically replace natural sand in the market, but it also has a bad disadvantage, which isHigh production costs and inconvenient flexibilityThis has resulted in "artificial sand" not being suitable for large-scale sales on the market.

River sandMachine-made sandThe price of natural sand has skyrocketed, so why is natural sand very scarce in China?

River sandRiver sand20 billion tons, accounting for almost half of global consumption.

With the acceleration of urbanization in China, rural housing renovation projects are gradually being put on the agenda,River sandRiver sand

River sandRiver sand, forming a vicious cycle.

2007River sandRiver sandRiver sandIt can be seen that the supply and demand relationship is tense.

River sandRiver sand

River sandRiver sandSold at extremely low prices and even given away for freeRiver sand

But now this situation is no longer the case, and the country has strictly prohibited arbitrary mining, from selling one truck in the past to selling one bag and one kilogram today,From cheap raw materials to "sweet cakes" in the construction market.

River sandThis is true of all countries around the worldRiver sandRiver sand

Machine-made sandA means of addressing the symptoms rather than the root causeRiver sand

Why not excavate

At this point, someone raises a question,River sand

According to statistics, the Yellow River carriesSediment exceeds 1.6 billion tonsEspecially

It can be seen that the Yellow River carries a large amount of mud, butCarrying more soil, not sand, only a small portion of it, andRiver sand

The situation between the Yangtze River and the Yellow River is different. Although the water is not turbid, the annual sediment transport is basically stable at500 million tons.Since the completion of the Three Gorges Dam, the sediment transport of the Yangtze River has significantly decreased, but new problems have emerged.

The terrain where the Three Gorges Dam is built is relatively flat, while the upper reaches of the Yangtze River have a large drop, which leads toIn addition to sediment, there is also a large amount of gravel piled up near the Three Gorges Dam.

A large amount of silted sedimentIt will affect the navigation of large tonnage ships, also affect the service life of the dam, reduce the capacity of the reservoir, and also affect the power generation, with the annual power generation of the Three Gorges Dam reaching hundreds of billions of kilowatt hours,It is an important part of China's power generation.

The load-bearing capacity of the Three Gorges Dam is limited, and if there is too much sediment, it will inevitably cause the dam to collapse,The sediment accumulated inside the dam now reaches 2 billion tons and accumulates upwards at an annual rate of 100 million tons.

The siltation inside the Three Gorges Dam has become a huge problem,Why let go and let people mine?

This matter is not as simple as it appears, due to the flood control effect of the Three Gorges Dam,The ecological environment in the nearby area has reached a balanceOnce large-scale commercial exploitation occurs, it will inevitably cause catastrophic damage to the local environment.

Once opened up, some companies may overexploit due to money and safety concerns, resulting in irreparable losses,The Three Gorges Dam is related to the safety of the entire middle and lower reaches of the Yangtze RiverNo loss is allowed at all.

In addition, although the accumulated sediment poses a risk of crushing the damAppropriate sediment can also play a role in consolidating the bottom of the dam.

The Three Gorges Dam has not been released, and it is alsoIt was decided through multiple considerationsAs for how to solve the sedimentation of the Three Gorges Dam, I believe we have a more scientific method to solve it.

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