Design And Material Research Of The Porous Ecological Revetment Block

With the deepening of the negative effect of traditional revetment to Chinese environment,and people are gradually awakening to the importance of ecological revetment.Blocks of traditional revetment have simple structure and single function,and traditional revetment has a negative effect on the environment for years.In recent years,porous ecological revetment is came up with,but the theory of pore is not perfect,so the domestic research for it made slow progress.To inhence this situation,the paper starts with behavior of fish and designed some reasonable experiments.Then the paper studies how does fishes choose when they face different environments,and gets the corresponding conclusions.Present these conclusion as basic principle to design the porous ecological revetment block.In addition,to make the new block adapt much more different landscapes and easy to construct that the paper have designed new connectivity and a cleaner shape.The paper does stability analysis of the porous ecological revetment block to guarantee its stability and three sizes of it.And it’s very important to choose the material of blocks.In general,revetment is made of simple concrete.But as simple sand becomes increasingly scarce and people has to find a alternative material.So the paper chooses super-fine sand for the research,and studys the properties of super-fine sand concrete.It eventually turns out the super-fine san concrete meets the need of generic project.When the above work is complete,the paper uses River2D to imitate fish gathering effect.And the result is the revetment improves the fish’s living enviroment.The main results and conclusions obtained are as follows:(1)In this article,the paper simulated different underwater environments for free choices of fish,and recorded the data randomly.Then the paper analyzed the selectivity of fish towards the pore.The result showed that:single factor such as lighting and state of surface cannot influence the habitat selection behavior of three kinds of fishes directly.They affect the behavior of fish when them and different underwater environment interaction effect;three kinds of fishes like sitting around the pore structure,and three kinds of fishes aware of the danger especially,lots of fish will hide in it;on the choice of different materials of pore,three kinds of fishes liked survive in the pore of concrete structures,the reason is that concrete is easy to construct the pore structure,and the space of it is very big,which fish is easy to hide in it;the porosity of the aquatic plants can also attract many fish.This study provides evidence for designing and optimizing of porous ecological revetment.(2)The paper uses the above mentioned results and follow some rules to redesign the block of revetment.And the paper have been designed the porous ecological revetment block.The new block of revetment has many big pores,and fishes swim around them and live in them;pore of plant growth provides a space for growing aquatic plant;in order to guarantee stability of the blocks,the article designs the embedded structure,it diversifies the connection of blocks to accommodate a variety of terrains.Through the stability analysis of porous ecological revetment block,three design sizes of block that meet the stability requirements was defined.(3)Then,the paper studied the material of the redesigned block.For the shortage of resources of medium sand,Liaohe basin is rich in resources of super-fine sand,and doing the test about comparing different water-cement ratio and different sand rate and studying the effect of water-cement ratio and super-fine sand ratio on the concrete’s workability and compressive strength,and pick out the best super-fine sand concrete mix proportion,and use it to configure C30 super-fine sand concrete.Using this ratio to do comparative experiment with medium sand concrete.The results show that the water-cement ratio is the main factor of affecting the strength of concrete,and the lower water-cement ratio of super-fine sand concrete has more strength;secondly,sand ratio also is the effective factor of concrete strength;in the same water-cement ratio,appropriately adjust the rate of sand to the compressive strength to meet the requirements.The best mix proportion of C30 super-fine sand concrete is that ratio of water-cement ratio is 0.45 and sand ratio is 0.33.Super-fine sand concrete specimens’ compressive strength is slightly higher than that of the compressive strength of medium sand concrete.And it shows super-fine sand concrete mixture workability and compressive strength of hardened specimens meet the requirements of the project.Because of the Lab location in Shenyang,Liaoning,which winter is cold.And parts of ecological revetment are immersed in the river,so the paper must study the impermeability and frost resistance of the super-fine sand concrete.Then the paper uses the best mix proportion of C30 super-fine sand concrete to do the test.The result shows and the impermeability grade of W6,the frost resistant grade of F200.(4)Finally select the Liaohe River Xinmin City as an example,a comparison of two schemes to simulate the Froude number.The option one:keep the river original conditions unchanged,option two:the river water level change area to build the revetment,the two conditions were simulated using River2D software,the Froude number,two methods the results show that Froude has a small number of Fr for two,while the number of small Froude number can have a good fish gathering effect,namely the improvement scheme of two fish habitat.