Method for reducing moisture content of anti-seepage earth material of clay core wall earth and rockfill dam

Abstract

The invention discloses a method for reducing the moisture content of anti-seepage earth materials of a clay core wall earth and rockfill dam, which comprises the following steps of: mining the earth materials with the natural moisture content higher than the upper limit of filling optimal moisture content deviation, and transporting the earth materials to an air film type storage warehouse provided with air dehumidification equipment for stockpiling; during stockpiling, the moisture content is detected synchronously, a dehumidifier is started for dehumidification, a warehouse light-transmitting film material is used for absorbing sunlight to increase the temperature in the warehouse, the moisture absorption capacity of air is enhanced, soil moisture evaporation is accelerated, and water generated during dehumidification is discharged out of the warehouse through a pipeline; continuously operating until the moisture content of the soil material reaches the standard, then closing the dehumidifier, stacking the new soil material on the upper surface of the qualified soil material, repeating the operation to uniformly stack the soil material layer by layer, and sealing a lower-layer moisture evaporation channel; qualified soil materials are transferred to a dam for filling in a layered mode, soil is taken from a soil material field to be supplemented into a warehouse on sunny days, water content reduction operation is repeated, and it is ensured that the water content of the soil materials is stabilized within the allowable range; according to the invention, the time and the cost required for tedding the soil material are eliminated, and the loss caused by shutdown and material waiting is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of clay core wall earth-rock dams, in particular to a method for reducing the moisture content of anti-seepage soil materials of clay core wall earth-rock dams. Background Art

[0002] Clay core wall earth-rockfill dams are widely used in energy and water conservancy projects due to their wide availability of material, low construction costs, and simple construction. As the core anti-seepage structure of an earth-rockfill dam, the quality of its compacted fill directly impacts the safety and service life of the dam. The moisture content of the anti-seepage soil material is a key indicator of the quality of the clay core wall's compacted fill. If the soil moisture content exceeds the optimal allowable range for fill, the clay core wall's compaction index will fail to meet the design compaction index, and the permeability coefficient index will not meet the requirements, resulting in substandard fill quality.

[0003] Clay core wall construction takes a long time, ranging from months to years. The volume of impermeable soil required is large, the material yard occupies a large area, and most of it is mined from the open pit. Affected by groundwater and atmospheric precipitation, the natural moisture content of the impermeable soil often exceeds the upper limit of the optimal moisture content for filling. Rainfall during construction can cause the moisture content of the impermeable soil to rise significantly due to the ingress of water into the soil. However, impermeable soil naturally retains water well, so once water enters, it is difficult to drain away. Consequently, earth-rockfill dam construction will be halted due to a lack of qualified raw materials.

[0004] Defects and shortcomings of existing technology: (1) According to the "Code for Construction Organization and Design of Roller Compacted Earth-Rock Dams" NB / T 35062-2015 and the "Code for Construction of Roller Compacted Earth-Rock Dams" DL / T 5129-2013: Anti-seepage soil materials should be constructed in the dry season, and the soil moisture content should be controlled within the deviation range of -2% to +3% of the optimal moisture content. Anti-seepage soil materials should be constructed on the same level as the upstream and downstream filter materials, transition materials and some rockfill materials, and rolled across the seams. If there is no qualified anti-seepage soil material, the entire dam filling construction will be affected. When the natural moisture content of the soil material does not meet the design requirements, it should be treated outside the dam and qualified before it can be put on the dam. If the natural moisture content of the soil material is lower than the deviation range of the optimal moisture content, the conventional treatment method is to sprinkle water on the soil material in an appropriate amount to increase the moisture content to meet the standard. This method is simple and easy to implement. When the natural moisture content of the soil material is higher than the deviation range of the optimal moisture content, the method of turning the soil material after rain or adding materials is usually used to reduce the moisture content to meet the standard. However, this method has the problems of wasting time and increasing costs.

[0005] (2) The anti-seepage soil material has good natural water retention, so it takes a long time to turn and dry it. The drying is interrupted at night, resulting in poor results, causing the project to be suspended while waiting for materials. This is especially difficult when the anti-seepage soil material needs to be constructed during the rainy season. For example, during the rainy season in southern China, it rains for more than 10 days in several months. In some cases, the intervals between rains are too short to allow the required time for turning and drying the soil material. The project is suspended, resulting in increased project costs and delayed construction. This may also pose a safety hazard to the dam body during flood control. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a method for reducing the moisture content of the anti-seepage soil material of a clay core wall earth-rock dam, so as to solve the problems raised in the background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for reducing the moisture content of anti-seepage soil material of a clay core wall earth-rock dam comprises the following steps: Step 1: Mining the soil in the soil material field whose natural moisture content is higher than the upper limit of the optimal moisture content deviation for filling; Step 2: transporting the mined soil to an air-film storage warehouse for storage, and the warehouse is equipped with air dehumidification equipment; Step 3: The soil is piled up in an air-film storage warehouse, and the soil moisture content is tested simultaneously. The air dehumidifier in the storage warehouse is turned on for dehumidification. Step 4: Use the light-transmitting membrane material of the air film type storage warehouse to absorb sunlight, so that the temperature inside the air film type storage warehouse rises; Step 5: As the temperature inside the air film storage warehouse rises, the air's ability to absorb moisture increases, accelerating the evaporation of moisture from the stored soil. Step 6: When the soil material is stored in the air film storage warehouse, the air dehumidifier in the storage warehouse dehumidifies the air, converts the water vapor in the air into water, and discharges it to the drainage ditch outside the storage warehouse through the pipe; Step 7: Continue to reduce the soil moisture content until the moisture content of the soil layer drops to the upper limit of the optimal moisture content, and then turn off the air dehumidifier; Step 8: The transported soil material is stored until the moisture content of the soil material is reduced to the upper surface of the qualified soil material that meets the upper limit of the optimal moisture content as described in Step 7, and then the soil material moisture content reduction operation of Steps 3 to 7 is repeated to ensure that the soil material moisture content is stable within the allowable range. The above process is repeated to evenly store the soil material layer by layer, so that the soil material with the qualified moisture content of the previous layer is covered by the new layer of soil material to a certain thickness, thereby closing the water evaporation channel inside the previous layer of soil material and keeping its moisture content stable; Step 9: Transport qualified soil materials in layers to the dam for filling. At the same time, when the moisture content of the soil material yard drops on a sunny day, take soil from the soil material yard and add it to the storage warehouse. Repeat the above steps to reduce the moisture content of the anti-seepage soil material. Preferably, in step 1, an excavator is used in conjunction with a dump truck in the soil material yard to mine soil materials in the soil material yard whose natural moisture content is higher than the upper limit of the deviation of the optimal moisture content for filling.

[0008] Preferably, in step 2, the air-film storage warehouse is a single-layer air-supported membrane structure, and the membrane material is a high-transmittance membrane.

[0009] Preferably, in step three, the soil material is stacked in layers into a quadrangular pyramid shape in a storage warehouse.

[0010] Preferably, in the step three, the height of each layer of soil in the storage warehouse is controlled at 1 meter, and a bulldozer or loader is configured in the storage warehouse to flatten the soil. Each layer of soil is flatly stacked, which plays a role in loosening, thinning, ventilating, drying, dehumidifying and reducing the moisture content of the soil; a 1:10 transport vehicle ramp is left along the long side of the warehouse to facilitate the stacking of soil, and the soil at the 2-meter inverted T-shaped concrete wall at the bottom of the warehouse can be stacked to the wall. The soil on the upper part of the inverted T-shaped concrete wall is stacked into a quadrangular pyramid shape with a 1:1.5 slope around the sides to prevent the soil from squeezing the air film structure.

[0011] Preferably, in step three, the soil moisture content detection method includes rapid detection methods such as resistance method, radiation method, and microwave drying method.

[0012] Preferably, in step five, since the warehouse adopts an air-supported membrane structure, it needs to rely on the pressure difference between indoor and outdoor to resist external loads, and the periphery of the membrane surface is closed and fixed to the supporting structure or foundation. However, the sealing problem of soil transportation vehicles and personnel entering and exiting the storage bin and the warehouse will cause the air in the warehouse to escape. In order to maintain the pressure difference between indoor and outdoor, it is necessary to continuously supply air through a fan. The continuous air supply of the fan is used to form a spatial curved surface, and at the same time, the soil in the warehouse can be blown dry to reduce the moisture content.

[0013] Preferably, in the step seven, the required working time of the air dehumidifier is calculated according to the situation that the soil moisture content exceeds the standard, and the opening and closing time of the air dehumidifier is set; The calculation formula is: H=ABN / C; Among them, H is the working time required by the dehumidifier; A is the average amount of earthwork per layer; B is the weight of water per cubic meter of soil at a moisture content of 1%; N is the percentage point at which the moisture content of the soil exceeds the standard; C is the weight of water discharged by the air dehumidifier per hour.

[0014] Preferably, in step nine, when the moisture content of the soil in the soil material yard exceeds the standard and cannot be used, the qualified soil in the storage warehouse is used after treatment; and after the moisture content of the soil material yard drops on a sunny day, soil is taken from the soil material yard and added to the storage warehouse to reduce the moisture content of the anti-seepage soil. At the same time, soil with a qualified moisture content that has been dried on a sunny day is selected from the soil material yard and directly added to the dam for filling. Beneficial effects of the present invention: (1) The present invention utilizes the characteristics of a single-layer translucent air-supported membrane structure dehumidifying soil storage warehouse with good windproof, rainproof, moisture-proof and heat-insulating effects. The high-transmittance membrane (such as ETFE membrane, transparent PVC membrane) allows a large amount of direct sunlight to enter the interior of the structure (sunlight transmittance 60-90%), directly drying the soil to reduce its moisture content. The translucent membrane structure absorbs sunlight, converts light energy into heat energy with high efficiency, and heats the air inside the membrane to increase the evaporation of moisture in the soil. The air-supported membrane structure relies on the pressure difference between indoor and outdoor to resist external loads, and uses a fan to continuously supply air to form a spatial curved surface, while blowing air to dry the soil in the warehouse. An industrial air dehumidifier is installed in the warehouse to remove moisture from the air, enhance the air's ability to absorb water vapor, and make the moisture in the soil more easily evaporate into the air. This cyclic comprehensive method continuously reduces the moisture content of the soil, thereby achieving the purpose of reducing the moisture content of the soil. The method is reliable, low-cost, and easy for construction units to choose.

[0015] (2) The present invention successfully overcomes the problem that the soil material needs to be turned over and dried after rain in order to reach the design optimal moisture content allowable range. It eliminates the time and cost required for turning over and drying the soil material, shortens the construction period, and reduces the loss of work caused by stopping work to wait for materials.

[0016] (3) This invention overcomes the limitation of the construction organization design specification for roller-compacted earth-rock dams, which requires that the construction of anti-seepage soil materials should be arranged during the rainy season. This allows continuous construction during the rainy season, especially in the rainy areas of the south. It also improves the adaptability of clay core wall earth-rock dams.

[0017] (4) The present invention utilizes the advantages of the air membrane structure in preventing wind and rain, and plays an environmental dust reduction role in earthwork projects. The membrane structure absorbs sunlight to heat the air inside the membrane to evaporate the moisture in the soil, reducing energy consumption and conforming to the concept of green and low-carbon engineering.

[0018] (5) The membrane material of the present invention is a light-transmitting membrane material, which provides good lighting in the storage warehouse during the day and reduces the lighting energy consumption in the warehouse. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the front view of the air-film structure soil material storage warehouse; Figure 2 This is a side view of the air-film structure soil material storage warehouse; Figure 3 This is a top view of the air-film structure soil material storage warehouse; Figure 4 This is the layout diagram of the air-film structure soil storage warehouse from a bird's-eye view: DETAILED DESCRIPTION The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1: Figure 1-4 As shown, a method for reducing the moisture content of anti-seepage soil material of a clay core wall earth-rock dam comprises the following steps: Step 1: Mining the soil in the soil yard whose natural moisture content is higher than the upper limit of the optimal moisture content deviation for filling; in this embodiment, an excavator is used in conjunction with a dump truck in the soil yard to mine the soil in the soil yard whose natural moisture content is higher than the upper limit of the optimal moisture content deviation for filling.

[0021] Step 2: The mined soil is transported to an air-membrane storage warehouse for storage. The warehouse adopts a single-layer air-supported membrane structure, and the membrane material is a high-transmittance membrane, and is equipped with an air dehumidification device. Compared with the shading film, the high-transmittance membrane has a higher light transmittance and a high efficiency in converting "light energy to heat energy", and absorbs heat and heats up quickly in the warehouse. Especially on sunny days, this warming effect is more obvious, and can make the internal temperature more than 10°C higher than the outdoor temperature. High-transmittance membranes (such as ETFE films and transparent PVC films) allow a large amount of sunlight to directly enter the interior of the structure (sunlight transmittance of 60~90%), directly drying the soil to reduce the moisture content. Step 3: Pile the soil into a quadrangular pyramid shape in the storage warehouse, and simultaneously test the moisture content of the soil, and turn on the air dehumidifier in the storage warehouse for dehumidification. The layer height is controlled at 1 meter, and a bulldozer or loader is configured in the storage warehouse to flatten the soil. Each layer of soil is flatly stacked, which plays a role in loosening, thinning, ventilating, drying, dehumidifying, and reducing the moisture content of the soil. A 1:10 transport vehicle ramp is set up along the long side of the warehouse to facilitate the stacking of soil. The soil at the 2-meter inverted T-shaped concrete wall at the bottom of the warehouse can be stacked to the wall. The soil on the upper part of the inverted T-shaped concrete wall is stacked into a quadrangular pyramid shape with a 1:1.5 slope to prevent the soil from squeezing the air film structure. Figure 4 The soil moisture content is tested using rapid testing methods such as resistance method, radiographic method, and microwave drying method. Step 4: Use the light-transmitting membrane material of the air-film storage warehouse to absorb sunlight and increase the temperature inside the storage warehouse; Step 5: As the temperature inside the warehouse rises, the air inside the warehouse increases its ability to absorb water vapor, and the soil stored in the storage silo evaporates moisture. The warehouse uses an air-supported membrane structure, relying on the pressure difference between indoor and outdoor to resist external loads. The membrane surface is closed and fixed to the supporting structure or foundation, and a fan is used to continuously supply air to form a spatial curved surface. Due to soil transportation vehicles and personnel entering and exiting the storage silo and the warehouse's sealing problems, air inside the warehouse will escape. To maintain the pressure difference between indoor and outdoor, the fan continuously supplies air, and at the same time, it blows air to dry the soil inside the warehouse to reduce its moisture content. Step 6: When the soil is stored in the warehouse, the air dehumidifier in the storage warehouse can be turned on for dehumidification. After dehumidification, the water vapor in the air is converted into water and discharged to the drainage ditch outside the storage warehouse through the pipe; when the soil is stored in the warehouse, a moisture content test is performed, and the moisture content index test is performed regularly during the process. If the test is qualified, the air dehumidifier can be turned off and stopped. The required working time of the air dehumidifier can also be calculated according to the soil moisture content exceeding the standard, and the air dehumidifier start and stop time can be set. Calculation formula: H=ABN / C H--Dehumidifier working time A--Average earthwork volume per layer B--Weight of water per cubic meter of earth at 1% moisture content N--Percentage of soil moisture content exceeding the standard C--Weight of water removed by the dehumidifier per hour Step 7: The soil material storage process is the process of reducing the soil material moisture content. The soil material moisture content is continuously reduced by a comprehensive method of using sunlight to dry, membrane structure insulation to convert light energy into heat energy to evaporate moisture, fans to continuously supply air to dry the soil material in the warehouse, and air dehumidifiers to dehumidify and drain water until the moisture content of the soil layer is reduced to meet the upper limit of the optimal moisture content, and then the air dehumidifier is turned off. When conducting a moisture content test on the soil material of this layer, one group is taken for every 100-200 cubic meters. If the test is qualified, the next layer of soil material can be stored. In addition, the required working time of the air dehumidifier is calculated according to the situation of the soil material moisture content exceeding the standard, and the start and stop time of the air dehumidifier is set. The calculation formula is: H=ABN / C; Among them, H is the working time required by the dehumidifier; A is the average amount of earthwork per layer; B is the weight of water per cubic meter of soil at a moisture content of 1%; N is the percentage point at which the moisture content of the soil exceeds the standard; C is the weight of water discharged by the air dehumidifier per hour.

[0022] Step 8: The transported soil material is stored until the moisture content of the soil material is reduced to the upper surface of the qualified soil material that meets the upper limit of the optimal moisture content as described in Step 7, and then the soil material moisture content reduction operation of Steps 3 to 7 is repeated to ensure that the soil material moisture content is stable within the allowable range. The above process is repeated to evenly store the soil material layer by layer, so that the soil material with the qualified moisture content of the previous layer is covered by the new layer of soil material to a certain thickness, thereby closing the water evaporation channel inside the previous layer of soil material and keeping its moisture content stable; Step 9: Transport qualified soil materials in layers to the dam for filling. At the same time, when the moisture content of the soil material yard drops on a sunny day, take soil from the soil material yard and add it to the storage warehouse. Repeat the above steps to reduce the moisture content of the anti-seepage soil material.

[0023] In this embodiment, the air-membrane storage warehouse foundation utilizes an inverted T-shaped C20 concrete structure. To prevent the air-membrane structure from being squeezed by stored soil, the foundation is designed to be 3 meters high, 1 meter deep, and 2 meters exposed. Pre-buried components for securing the air-membrane structure and the cross-cables are pre-embedded at the top of the foundation. The warehouse floor is designed with a 20cm-thick C20 concrete floor to prevent moisture, and drainage ditches are located around the perimeter of the warehouse.

[0024] The storage warehouse is equipped with a set of vehicle access passages, a rolling door at each end, a revolving door for personnel passage, and an emergency escape door.

[0025] The storage warehouse is equipped with a set of air film pressurization equipment, a set of automatic control system, a set of air film power distribution control cabinet, a set of air dehumidifier, a set of emergency generators, and a set of cross steel cables for fixing the air film structure.

[0026] Preferably, in step nine, when the moisture content of the soil material in the soil material yard exceeds the standard and cannot be used during rainy days or after rain, the treated qualified soil material in the storage warehouse is used; and when the moisture content of the soil material yard drops on sunny days, soil is taken from the soil material yard and added to the storage warehouse to reduce the moisture content of the anti-seepage soil material. At the same time, the soil material with qualified moisture content that has been dried on sunny days is selected from the soil material yard and directly added to the dam for filling. This method can reduce the impact of rainy weather on the construction of clay core wall earth-rockfill dams, reduce various adverse factors caused by rain-induced work stoppages, and promote the improvement of the balance of engineering construction.

[0027] The working principle of the single-layer air-supported membrane structure dehumidification soil storage warehouse to reduce the moisture content of anti-seepage soil is as follows: At the soil material yard, excavators and dump trucks are used to mine soil materials with a natural moisture content higher than the upper limit of the optimal moisture content deviation for filling and transport them to an air-film storage warehouse for storage. Since the soil materials have been loosened during the mining operation, it is conducive to the evaporation of the moisture contained in the soil materials in the warehouse. The air-film storage warehouse has excellent sealing performance and has excellent windproof, rainproof, moisture-proof and heat-insulating properties. The single-layer air-supported membrane structure using light-transmitting membrane materials can better absorb sunlight than air pillow membrane structures, air rib membrane structures, and air bag membrane structures, and can increase the temperature inside the membrane structure by about 10°C compared to the temperature outside the membrane structure. According to meteorological principles, an increase in the temperature inside the warehouse will increase the saturated water vapor capacity of the air. Therefore, when the temperature inside the warehouse rises, if the absolute humidity of the air remains unchanged, the relative humidity will decrease. At this time, the air's ability to absorb water vapor is actually enhanced. As moisture in the soil evaporates more easily into the air, the soil's moisture content decreases. The dehumidifiers installed in the warehouse convert water vapor into water, removing it through pipes and draining it to the drainage ditch outside the storage bin. As moisture in the soil continues to evaporate into the air, the moisture content gradually decreases to meet the design requirements.

[0028] Example 2: The optimal moisture content of the anti-seepage soil material of a certain project is 22%. The average natural moisture content of the soil material field is 26%. The moisture content of the anti-seepage soil material needs to be reduced by 4% before it can be used. The dry density of the soil material is 1500kg / m 3 , 60kg of water is required for each cubic meter of anti-seepage soil. The average daily filling demand for the project is 1000m3 of anti-seepage soil. 3 . Construction 45×80m 2 Single-layer air-supported membrane structure dehumidification soil storage warehouse, soil is layered into a quadrangular pyramid shape, each layer is 1 meter thick. The pile height is 5m. It can store 16,000m 3 , meeting 15 days of supply. It takes an average of 3 days to complete each layer of storage, and the average storage capacity of each layer is 3200m 3 In three days, 3,200 x 60 = 192,000 kg of moisture must be removed, an average of 2,267 kg per hour. Ten industrial dehumidifiers are installed in the storage warehouse, each dehumidifying 250 kg per hour. The moisture content of each layer of material can be reduced during storage, and this process can be performed continuously within the warehouse, unaffected by rainfall. Moisture content is tested daily, allowing the dehumidifiers to be adjusted based on changes in moisture content.

[0029] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for reducing the moisture content of anti-seepage soil material of a clay core wall earth-rock dam, characterized in that: The steps include: Step 1: Mining the soil in the soil material field whose natural moisture content is higher than the upper limit of the optimal moisture content deviation for filling; Step 2: transporting the mined soil to an air-film storage warehouse for storage, and the warehouse is equipped with air dehumidification equipment; Step 3: The soil is piled up in an air-film storage warehouse, and the soil moisture content is tested simultaneously. The air dehumidifier in the storage warehouse is turned on for dehumidification. Step 4: Use the light-transmitting membrane material of the air film type storage warehouse to absorb sunlight, so that the temperature inside the air film type storage warehouse rises; Step 5: As the temperature inside the air film storage warehouse rises, the air's ability to absorb moisture increases, accelerating the evaporation of moisture from the stored soil. Step 6: When the soil material is stored in the air film storage warehouse, the air dehumidifier in the storage warehouse dehumidifies the air, converts the water vapor in the air into water, and discharges it to the drainage ditch outside the storage warehouse through the pipe; Step 7: Continue to reduce the soil moisture content until the moisture content of the soil layer drops to the upper limit of the optimal moisture content, and then turn off the air dehumidifier; Step 8: The transported soil material is stored until the moisture content of the soil material is reduced to the upper surface of the qualified soil material that meets the upper limit of the optimal moisture content as described in Step 7, and then the soil material moisture content reduction operation of Steps 3 to 7 is repeated to ensure that the soil material moisture content is stable within the allowable range. The above process is repeated to evenly store the soil material layer by layer, so that the soil material with the qualified moisture content of the previous layer is covered by the new layer of soil material to a certain thickness, thereby closing the water evaporation channel inside the previous layer of soil material and keeping its moisture content stable; Step 9: Transport qualified soil materials in layers to the dam for filling. At the same time, when the moisture content of the soil material yard drops on a sunny day, take soil from the soil material yard and add it to the storage warehouse. Repeat the above steps to reduce the moisture content of the anti-seepage soil material.

2. The method for reducing the moisture content of the anti-seepage soil material of a clay core wall earth-rock dam according to claim 1, characterized in that: In the step 1, an excavator is used in conjunction with a dump truck in the soil material yard to mine the soil material whose natural moisture content is higher than the upper limit of the deviation of the optimal moisture content for filling.

3. The method for reducing the moisture content of the anti-seepage soil material of a clay core wall earth-rock dam according to claim 1, characterized in that: In the step 2, the air-film storage warehouse is a single-layer air-supported membrane structure, and the membrane material is a high-transmittance membrane.

4. The method for reducing the moisture content of anti-seepage soil material of clay core wall earth-rock dam according to claim 1, characterized in that: In the step three, the soil material is stacked in layers in a storage warehouse into a quadrangular pyramid shape.

5. A method for reducing the moisture content of anti-seepage soil material of a clay core wall earth-rock dam according to claim 1 or 4, characterized in that: In the step three, the height of each layer of soil in the storage warehouse is controlled at 1 meter, and a bulldozer or loader is configured in the storage warehouse to flatten the soil. Each layer of soil is stacked flatly, which plays a role in loosening, thinning, ventilating, drying, dehumidifying, and reducing the moisture content of the soil; a 1:10 transport vehicle ramp is left along the long side of the warehouse to facilitate the stacking of soil, and the soil at the 2-meter inverted T-shaped concrete wall at the bottom of the warehouse can be stacked to the wall. The soil on the upper part of the inverted T-shaped concrete wall is stacked into a quadrangular pyramid shape with a 1:1.5 slope around the sides to prevent the soil from squeezing the air film structure.

6. A method for reducing the moisture content of anti-seepage soil material of a clay core wall earth-rock dam according to claim 1 or 4, characterized in that: In the step three, the soil moisture content detection method includes rapid detection methods such as resistance method, X-ray method, and microwave drying method.

7. The method for reducing the moisture content of anti-seepage soil material of clay core wall earth-rock dam according to claim 1, characterized in that: In step five, since the warehouse adopts an air-supported membrane structure, it needs to rely on the pressure difference between indoor and outdoor to resist external loads, and the periphery of the membrane surface is closed and fixed to the supporting structure or foundation. However, the sealing problem of soil transportation vehicles and personnel entering and exiting the storage bin and the warehouse will cause the air in the warehouse to escape. In order to maintain the pressure difference between indoor and outdoor, it is necessary to continuously supply air through the fan. The continuous air supply of the fan is used to form a spatial curved surface, and at the same time, the air can be blown to dry the soil in the warehouse to reduce the moisture content.

8. The method for reducing the moisture content of anti-seepage soil material of clay core wall earth-rock dam according to claim 1, characterized in that: In the step 7, the required working time of the air dehumidifier is calculated according to the soil moisture content exceeding the standard, and the start and stop time of the air dehumidifier is set; The calculation formula is: H=ABN / C; Among them, H is the working time required by the dehumidifier; A is the average amount of earthwork per layer; B is the weight of water per cubic meter of soil at a moisture content of 1%; N is the percentage point at which the moisture content of the soil exceeds the standard; C is the weight of water discharged by the air dehumidifier per hour.

9. The method for reducing the moisture content of anti-seepage soil material of clay core wall earth-rock dam according to claim 1, characterized in that: In step nine, when the moisture content of the soil in the soil material yard exceeds the standard and cannot be used, the qualified soil in the storage warehouse is used after treatment; and after the moisture content of the soil material yard drops on a sunny day, soil is taken from the soil material yard and added to the storage warehouse to reduce the moisture content of the anti-seepage soil. At the same time, soil with a qualified moisture content that is dried on a sunny day is selected from the soil material yard and directly used for dam filling.

Images