On the way, Qin He asked Shi Rui, "How to analyze the impact of river water on dams? We have also studied fluid mechanics."
Deng Fei said: "I have learned it, but can I use it now?"
Shi Rui replied: "When analyzing the impact of river water on dams, the following fluid mechanics theories can be used: Hydrostatics: used to analyze the mechanical properties of stationary fluids, including pressure distribution, buoyancy, and the static balance of liquids. In When analyzing the water pressure on a dam, you can use hydrostatic theory to calculate the magnitude and distribution of water pressure. Fluid dynamics: used to analyze the movement and mechanical properties of fluids, including velocity distribution, flow, resistance, vortex, etc. When analyzing the impact and erosion force of river flow on levees, fluid dynamics theory can be used to calculate the velocity and pressure distribution of the fluid, as well as the force on the levees. Hydraulics: Specializes in the study of the movement and mechanical properties of water. In analysis When analyzing the impact of river water on embankments, hydraulic theory can be used to calculate the speed, flow and pressure distribution of water flow, as well as the impact and erosion force on embankments. River dynamics: This door studies the movement and mechanical properties of rivers. In analyzing the impact of river water on embankments, When considering the impact of levees, river dynamics theory can be used to consider the impact of river changes, water level fluctuations, river bed erosion and sedimentation and other factors on levees.
Fluid simulation software can be used for analysis. But it is just a tool, and the accuracy of the results is also affected by factors such as the accuracy of the model, the accuracy of the boundary conditions, and the applicability of the fluid mechanics theory. Therefore, the assessment must be based on the actual situation. "
Qin He said: "The dam is probably near our Sencheng city."
Deng Fei said: "Yes. According to the construction team's test results, the flood has not broken down the dam."
They bypassed the flood zone and arrived near the upstream city.
The river rushes down like a beast ready to go, carrying endless power and impact. It flows rapidly, stirring up waves, as if thousands of troops are galloping past, washing the land on both sides of the river bank. The sound of the river was deafening like thunder.
Deng Fei called the construction team Maozhi, "Where are you? Can you come over?"
Maozhi said: "The place we are in is relatively dangerous. There are floods next to us, and we are dredging the river now. You can't help here."
"We have a stone here that can control the direction of the water flow," Deng Fei said.
Maozhi said: "Is there such a thing?"
Deng Fei said: "It's a long story. Where are you? I'll go over."
Maozhi said: "Don't come here yet, or I will pick you up. We have marked some roads in advance. Remember to follow these roads to be safe. The foundations in many other places are not strong and may collapse."
They looked over from a distance and saw two rows of floodwater pouring past. The original road surface has been covered. In some places it has overflowed the branches.
From a distance, I saw a speedboat approaching, with Maozhi sitting on it.
Maozhi said: "The water here is too big. I can only come here by yacht, pick you up, and then pick up other vehicles when we get there. The vehicles have also been modified. If they fall into the water, they can still float in the water." Start inside."
Deng Fei said: "I thought you would drive over here, but I was worried that your car would stall."
Maozhi said: "It is easy to stall when driving. Most of the vehicle is submerged in water.
They get on the yacht. Galloping all the way around the stone branches next to it.
Maozhi said: "This water is very big. We must dredge the river quickly now. If the river water hits the dam downstream, it will threaten the safety of urban citizens."
Finally arrived at the original river location. It is no longer possible to distinguish the original river course from the land.
Qin He said: "Are you sure this is the original river? Now it is all a body of water."
"Yes, according to the location on the map, this area is the original river, but most of it is blocked. There should be a flood storage area, and the water can be diverted there and stored, but because the river is blocked , so the river water does not flow according to this path. If the silt in the river channel can be dredged, then the river water can flow according to the river channel and finally flow into the flood storage area, so that there will not be so much water in this area."
Kuang Yan took out the stone from his bag. Try placing the rocks horizontally, vertically, or tilted, and then look at the direction of the nearby water flow. He placed the stones in a direction perpendicular to the direction of the water flow, and the water moved to both sides. There is an empty space left in the middle.
Deng Fei said: "How can we make this stone work now? Is it possible to control the water flow and directly let the water flow back?"
Shi Rui said: "It goes back and there is no place to store it."
Xia Yueling said: "Or we can control the movement of the water flow and fly directly to the pool in this area."
Kuang Yan tried it, but the water flow only jumped a short distance and then fell again, like a waterfall.
Maozhi said: "There really is such a magical thing. What's the principle?"
Qin He said: "It's too late to think about its principle. Let's use it now. Or deal with it this way. The water in this area is drained to the side, leaving an area without water in the middle for engineering vehicles to work."
Shi Rui said: "Then how can the engineering vehicle reach the middle to excavate?"
Maozhi said: "Then the water slopes on both sides can be made smoother, and the engineering vehicles can be converted into water flow mode. They can go down along the water slope and then convert to land mode to start digging. The excavated soil can then be used by the engineering vehicles. The earth moving truck will transport it out.”
Shi Rui said: "But can the area in the middle that avoids water be maintained stably? Will the water suddenly come down while digging?"
Qin He said: "No, you see the current flow is still relatively stable. It can last for a while."
Xia Yueling said: "Can't the vehicle be converted into a water flow state? Are you not afraid of water?"
Maozhi said: "Just like a boat, I am afraid that water will suddenly pour from above and it will sink."
Maozhi called the excavator to come over. They looked up and saw that there were four huge floats on both sides of the excavator, which allowed it to float on the water. There is a waterproof device underneath. There is a propeller behind it. The excavator goes down the water slope. After reaching the ground, the float is retracted, the propeller at the back is retracted and the crawler tracks are lowered, turning it into a land-based excavator.
Next five more excavators came down. Then several construction trucks came to transport the excavated soil away. After digging this place, dig another place along the direction of the river.
The construction team's earth drill also came over from the water slope. The soil thrown out after the earth drilling machine rotates is loaded into the huge loading box at the rear. The earth drilling machine moves forward slowly, loading the soil into the loading box at the back, and then drills out of the river to transport the soil to other places. place.
After a day and a half, this part of the river was dredged, and the river flowed along the river to the flood storage tank.
When the floods basically receded and the water level dropped, they sat in the construction team's room to rest.
Kuang Yan said: "Our boat is behind the car. We won't use it this time, so we should take it back."
Qin He said: "This boat is useless. The water is too big and it can easily capsize."
Shi Rui said: "It's better to use it when rowing on the lake in Sencheng."
