1 project overview
Zhou Ke Ganxin Iron and Steel Co., Ltd. newly-built high-strength steel production line with an annual output of 6,543,800 tons is located in Artux Industrial Park, Kizilsu Kirgiz Autonomous Prefecture. The production scale of the project is a new high-strength steel production line with an annual output of 6,543,800 tons, with an annual output of 6,543,800 tons of qualified continuous casting billets and an annual output of 960,000 tons of various bars. The construction contents of the project mainly include: steelmaking plant, ironmaking plant, comprehensive raw material plant, sintering plant, lime plant and corresponding public and auxiliary facilities. The total amount of earthwork excavation is 230 1 10000 m3, and the total amount of fill is 65438+955900 m3. Most of the excavation is used for site leveling and backfilling, and the remaining 345,654,38+0,000m3 waste slag is temporarily stacked in the reserved area for later site development as a temporary waste slag field during the construction period, which is finally used by Artux Industrial Park for road construction in the park.
2 soil erosion prediction
The land acquisition scope of this project is 200hm2, of which the permanent land area is 138. 1hm2, and the temporary land area is 6 1.9hm2, all of which are gravel desert no man's land, with low productivity. The total area of soil and water conservation facilities destroyed in the project construction is 200hm2. During the construction period of the project, the total earthwork excavation volume is 230 1 10,000 m3, the backfill volume is 654.38+955,900 m3, and the temporary waste slag volume is 345 1 10,000 m3, without permanent waste slag. If no preventive measures are taken in the construction of this project, the total amount of water and soil loss that may be caused during the construction period is 29350.5t, and the newly-increased water and soil loss is 21373.5t. The erosion type of newly-increased water and soil loss is mainly wind erosion, and the newly-increased water and soil loss is mainly concentrated in steel mills, ironworks, public and auxiliary facilities and temporary slag yard areas. The main period of soil erosion is the construction period.
3 Soil erosion hazards
3. 1 may cause damage to land resources. The construction of this project will disturb the surface, destroy the surface vegetation and crust during the construction period, and increase the intensity of soil erosion.
3.2 The level of soil productivity that may cause the decline of land productivity is closely related to the physical and chemical properties of land. The impact of the project construction on the surrounding land productivity may be reflected in the following aspects: the increase of disturbed surface soil erosion intensity will reduce the fine grain content, increase the coarse grain content, coarsen the soil mechanical composition and lose organic matter, thus further reducing the land productivity in the project area and surrounding areas. If the drainage system in the project area is not perfect, the accumulated water in the park cannot be discharged smoothly, which will cause environmental problems such as soil salinization and reduce land productivity.
3.3 Possible impact on the surrounding environment The original landform, land and vegetation were destroyed during the construction of this project, with a total area of 200hm2. The possible impact of large-scale surface disturbance on the surrounding environment during the construction period is mainly reflected in: the local dry natural conditions determine that as long as the surface is disturbed, dust will be generated even in windless weather. Therefore, the rolling back and forth of construction vehicles will make the surrounding area of the construction area under the cover of ups and downs for a long time, which will do harm to the production and life of local residents and even the health of construction workers.
4 soil erosion control measures and overall layout
4. 1 greening and soil preparation engineering measures: ① land leveling: before greening around the steel plant, the land in the greening area should be leveled. When leveling, 74kW bulldozer can be used to cooperate with manual construction, mainly bulldozer construction, and the greening area will be leveled by manual cooperation with machinery, and the leveling area is about 2.6hm2. ② Comprehensive soil preparation: the soil type in the project area is gray desert soil, and the surface soil is mixed with more gravel, which is poor in fertility and low in water retention, so it is not suitable for plant growth, so comprehensive soil preparation is needed. The greening area around the steelmaking plant is 2.6hm2. Therefore, if comprehensive soil preparation measures are taken, the soil must be covered in the whole greening area. Greening and covering soil can make use of the earth left after screening of crushed stone from foundation excavation of iron and steel plant, and then temporarily pile it in the temporary slag yard next to the iron and steel plant after screening, and take temporary soil retaining and covering measures. After the completion of the civil works in the iron and steel plant, it will be transported to the surface of the green area, slightly compacted after adding fertilizer, and then leveled. The covering thickness is 30cm, and the covering area is 2.6hm2 It is estimated that * * * needs about 13000m3 of earthwork.
4.2 Main project design of plant measures: The planned greening area around the steel plant area is 2.6hm2, and the greening coefficient is 9%. However, the layout scheme and irrigation method of greening measures were not specifically designed in the design of the main project, which was not included in the greening investment. Therefore, this plan will carry out preliminary planning and design, arrange greening measures in the steelmaking plant area according to local conditions, mainly planting lawns, and provide corresponding irrigation facilities to meet the growth needs, so as to achieve the effect of wind prevention, dust removal and beautification of the plant area. In this plan, lawn is planted in the open space around the steel plant, Poa pratensis and Bermuda grass are mixed with grass seeds, and sprinkler irrigation facilities are installed, covering an area of about 2.6hm2.
4.3 Temporary measures According to the earthwork balance of the project, the steel mill produces about 3 1.500 m3 waste slag, which is temporarily stacked in the temporary waste slag yard. Because this part of the excavated topsoil is loose, if it is piled up at will without protective measures, it will cause dust, affect the construction and cause soil erosion in windy weather.
5 Overall layout and conclusion
In order to effectively prevent and control the new water and soil erosion during the construction of this project, new water and soil erosion prevention measures should be arranged as a whole according to the project layout, water and soil erosion distribution and regional natural and socio-economic conditions. Adhere to the principle of zoning prevention and control, and determine the guiding prevention and control measures according to the zoning of soil erosion prevention and control to which the project belongs. According to the characteristics of construction disturbance in the project area, the treatment units are divided and the leading prevention and control measures system of each treatment unit is put forward. In each treatment unit, economic, reasonable and safe prevention measures are recommended according to the systematic demonstration of the main corrosion parts. In the arrangement of prevention measures, the controllability and rapidity of engineering measures are mainly used during construction. After the construction is completed, as long as each control area has suitable soil and water conditions, plant measures can be taken. After the implementation of the soil and water conservation plan, it can control soil erosion, restore and improve the ecological environment, and has remarkable ecological and social benefits. After the implementation of this soil and water conservation project, the disturbed land remediation rate reached 95.07%, the total soil erosion control rate reached 90. 13%, the soil erosion control rate reached 1, the residue retention rate reached 98.9 1%, the forest and grass vegetation recovery rate reached 90%, and the forest and grass vegetation coverage rate reached 38%, which achieved good results.
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