Chapter 706 (1/2)
The reason for this is to reduce the front pressure of each wall and to facilitate the design of internal bearing columns.
This idea was contributed by village head Peddy.
They are the real experts in underground architecture.
They can infer the trend of groundwater and the activity of the earth vein in the future.
The former is the most common factor of small-scale underground collapse. Once the humidity of a certain cave is above the normal level all the year round, especially with different degrees of water seepage, the collapse risk of the cave will rise linearly, and some will become * *.
The latter is the culprit of large-scale cave collapses. Cave diggers such as underground dwarfs and mountain dwarfs, when digging caves, do not dig casually. They will take the initiative to avoid the ground veins that can be used as the main support points, and even consciously strengthen them, so that the whole underground city becomes stronger.
As Sean had imagined at the beginning, when the ground digger got hold of it, he just had to find a straight line and dig to the northern fortress at one go.
This idea is a little too taken for granted, completely ignoring the ever-changing nature.
The surface of the earth looks similar in many places, but the internal composition is different. There are more kinds than you can imagine.
If the soil layer is divided into overburden layer, leaching layer, transition layer, sedimentary layer, parent material layer and parent rock layer.
If according to the soil classification, it can be divided into: soft soil, ordinary soil, gravel soil, soft rock, secondary hard rock, hard rock, especially hard rock.
The soil layer structure is not unchangeable. The conditions of different places are different, which is closely related to the changes of the environment.
All kinds of soil are also mixed together. Maybe the first 100 meters is hard rock soil, and the last 100 meters is gravel solid soil.
If they simply go to dig holes, they don't need to think about these things. They just walk straight. They don't care whether they will collapse after they pass by.
If we want to excavate the underground passage which can be used for a long time and is not easy to be damaged by the natural environment, we must avoid some dangerous areas.
For example, the phreatic and deep water layers, even magic rocks, can't withstand the erosion of water.
Another example is the desert area, at least can not build too shallow, full use of underground veins as a support point.
Because the surface of desert area is too easy to change, a gust of strong wind can turn the basin into sand dunes, which greatly increases the underground pressure. If the passage is directly built under the sand, it will be easily crushed.
In fact, the environment where the shadow city is located is not the ideal environment for a large-scale underground city. It is affected by the energy and rules from the space cracks and the influence of years. The surrounding area is very dark and regional, and the stratum is relatively stable. Only then can we have the present underground city.
In fact, the whole shadow city is centered on the space cracks, which is round. The farther away from the space cracks, the less stable the stratum is, and the more difficult it is to build a large number of caves.
In other words, if the space cracks are completely closed, the stability of shadow city will be affected.
Therefore, many residents of shadow city are not as strong as Alma in closing the space cracks, and some even swing from side to side.
If not handled properly, their future will be deeply affected.
This investigation found that Sean had written in his mind that if he had a disagreement with Alma because of the space crack, he could start from the above.
The biggest weakness of this camp is that they are easily threatened by the overall situation.
Sean found that he was absolutely crazy in infrastructure, and once immersed in it, he was a bit unable to extricate himself.
In the shadow city, he is not so simple as building his own mage tower.
After the launch, Sean could not bear the complicated and disordered layout of shadow city, especially the road to Alma maze.
As soon as the underground mage tower had a little appearance, he mobilized the residents of the shadow city to carry out a major reconstruction of the shadow city. In particular, several main passageways leading to the mage tower were opened first to connect most of the local residents' villages. This will greatly enhance their support for the construction of the mage tower and facilitate the transportation of materials, especially mushroom food provided by mushroom people.
The construction of the underground tunnel leading to Yongye Junling has also been put on the agenda.
Don't forget, there's more than one digger.
After the construction of the mage tower in the shadow city was in normal operation, Sean took the Dragon spirits and went to the energy mine again and found another ground digger there.
Except that it took a bit of time to find the trail of this ground digger in the complex cave, the whole process was very smooth.
The strength of this ground digger is obviously weaker than that captured first. It is not only two models smaller, but also several times younger.
Longhun previously guessed that it was right that this digger was generated by the previous one. From the genetic level, the two sides are the same.It's just a little bit wrong, that is, this guy didn't split up temporarily to deal with Sean.
This kind of self division needs not only a lot of energy, but also terrible flesh and blood. After the division, both the mother and the offspring need to eat crazily. At least tens of thousands of grassland cattle have to be devoured to make up for it.
When Sean first provoked the ground digger, the other was nearby, but he didn't have time to fight.
Sean was too lazy to use his brain to name the ground digger too complicated. He simply distinguished it by the serial number. The first one was named number one, and the second one was only number two.
When Sean drove the No. 2 burrow beetle back to shadow city, the residents were shocked because they had never seen two ground diggers around at the same time, and no one had enough food to watch the terrifying underground predator up close.
After shock, there was another burst of ecstasy.
Because they have personally experienced the convenience of a controlled ground digger.
They mobilized the whole village and spent years of excavation work. It took only a few days to dig the purple bug. They only need to spend a small amount of manpower to carry out intensive renovation on this basis.
The mountain dwarfs mobilized all the adult labor force of the whole clan, including those women, to forge steel bars at a speed that could not keep up with the magic bricks and stones made by purple worms in half a day.
Most of the time, ground diggers have to stop and wait for the progress of the mountain dwarfs and the underground dwarfs.
The road arrangement of the shadow city is carried out in the spare time of digging the purple insect.
It is obviously unnecessary for two ground diggers to build a mage tower together.
When No. 2 ground digger came, he replaced No. 1 ground digger, specializing in opening the underground tunnel to Yongye Junling.
After opening the channel, all aspects of resources led by Yongye army will be able to come up, only on one hand.
On the other hand, Sean wants to speed up the construction of some key facilities led by Yongye army by using the ground diggers, so as to make full use of the energy mines mined from the energy crystallization pit.
Otherwise, no matter how much energy crystal he is digging, there will be no meaning.
When it took half a year to dig the ground, a 1500 kilometer long underground passage was dug out to return to the Yongye army leader, and the shock could be imagined.