In-situ sand and gravel anti-seepage material preparation and water cut-off curtain construction method and device

Abstract

The present invention relates to a method and device for preparing an in-situ sand and pebble anti-seepage material and constructing a water-cutting curtain. The method provided by the present invention is as follows: an aggregate preparation device crushes and screens the pebbles and sand produced in the process of forming a trench for the water-cutting curtain, crushes the pebbles and gravel into crushed stones and machine-made sand of different particle sizes, mixes the crushed stones, machine-made sand and natural sand added by an aggregate configuration device, and then pours them into a stirring device, and then prepares them into an anti-seepage material with good performance, and delivers them to the trench section of the water-cutting curtain through a pumping device. The device provided by the present invention includes an aggregate preparation device, an aggregate configuration device, a stirring device, a pumping device and a pouring device. The present invention has a simple structure, is easy to operate, is practical and reliable, avoids the phenomenon of mining raw materials such as river sand, crushed stone or pebbles to damage the ecological environment, protects the ecological environment, and at the same time improves the performance of the water-cutting curtain anti-seepage material, construction efficiency and water-cutting effect.

Description

Technical Field

[0001] The invention relates to the technical field of underground anti-seepage, pollution control and water conservation, and in particular to a method and a device for preparing an in-situ sand and pebble anti-seepage material and constructing a water-cutting curtain. Background Art

[0002] Most of my country's open-pit coal mines and some large water mines are located in the sandy and gravel layer areas with strong water-rich and strong replenishment. The stratum permeability coefficient is large. It is replenished by surface rivers. Pumping wells are often used to control or drain the mine water level, and the drainage volume is huge. Long-term drainage causes a large area of ​​groundwater level drop, water difficulties for surrounding residents' living and production, death of shallow vegetation, land desertification, pollution of surface water bodies by the discharge of mine water, huge long-term drainage costs, and high production costs. The use of water-cutting curtains can achieve the protection of mine water resources and ecological environment and reduce water resource costs. At the same time, in metal mines, underground mine water-cutting curtains, water conservancy project anti-seepage, landfill pollutant isolation, municipal and civil engineering water-cutting curtains, ecological environment water conservation curtains and other projects, in order to meet the strength and anti-seepage requirements of water-cutting curtain walls, the use of low-strength anti-seepage concrete or plastic concrete can improve the anti-seepage effect and meet the needs of the project. A wall-plate-type rectangular trench section is constructed in the stratum by using trench-forming equipment such as double-wheel milling machines, hydraulic grab trench-forming machines, and rotary drilling rigs. The excavated sand, gravel and other raw materials are transported away as waste slag, and anti-seepage concrete is poured into the excavated trench section.

[0003] The problems with the existing technology are: 1. The wall-type rectangular slot sections are constructed in the stratum by slotting equipment such as double-wheel milling, hydraulic grab slotting machine, rotary drilling rig, etc., and a large amount of sand, pebbles, mud and other materials will be generated during the construction process. The existing treatment method is to transport the excavated sand, gravel, waste mud and other raw materials as waste slag, which has the problems of low on-site utilization, occupying stacking land and polluting the environment. 2. The use of concrete tank trucks to transport low-strength impermeable concrete or plastic concrete to pour water-cutting curtain slot sections to form an impermeable wall has the problem of long transportation distance of impermeable materials, resulting in high material costs. At the same time, due to the large number of vehicles on site and cross-operation, safety prevention and control is difficult. 3. The preparation of impermeable concrete or plastic concrete requires the mining of raw materials such as river sand, gravel or pebbles, which damages the ecological environment. 4. The fluidity of freshly mixed concrete mainly depends on the adsorption of a layer of water film on the surface of aggregate and cement particles, so that the particles are relatively lubricated. The cohesiveness also mainly depends on the surface tension of water. If the amount of water is too little, the water film is thin and the lubrication effect is poor; if the amount of water is too much, the capillaries are filled with water, the effect of surface tension is reduced, the cohesiveness of concrete becomes poor, and it is easy to bleed water. Therefore, the amount of water directly affects the workability of cement concrete. When the types and proportions of coarse aggregate and fine aggregate are determined, the slump of anti-seepage concrete mainly depends on the water consumption per unit volume, and is less affected by other factors. Generally, anti-seepage concrete is transported from the mixing station to the construction site by tank trucks. The transportation time on the road varies from 30 minutes to 60 minutes. In summer, the temperature is high and the water evaporates quickly, the slump will be lost, the soil will become very dry, and the performance of anti-seepage concrete will be greatly affected. In order to solve the problem of time loss during concrete transportation, it is often necessary to increase the water-cement ratio and increase the amount of water in the anti-seepage material, which will inevitably reduce the strength and anti-seepage performance of anti-seepage concrete. Summary of the invention

[0004] The present invention aims to provide a method and device for preparing in-situ sand and gravel anti-seepage materials and constructing a water-cutting curtain, so as to overcome the problems of low on-site utilization rate, environmental pollution, high material cost, great difficulty in safety prevention and control, and damage to the ecological environment in the prior art, and at the same time overcome the problem of decreased strength and anti-seepage performance of anti-seepage concrete caused by long-distance transportation.

[0005] Based on the above purpose, the technical solution provided by the present invention is: a method for preparing an in-situ sand and pebble anti-seepage material and constructing a water-cutting curtain, which comprises the following steps in sequence:

[0006] Step 1: Determine the location of the water cut-off curtain according to the characteristics of the project;

[0007] Step 2: Use trenching equipment to dig a wall-plate rectangular trench section, and transport the waste materials such as natural sand, pebbles, gravel, etc. in the trench section to ground transportation equipment;

[0008] Step 3: inject slurry into the excavated trench section to protect the wall;

[0009] Step 4: In synchronization with steps 2 and 3, the waste slag materials excavated in the slot section are transported to the aggregate preparation device via ground transportation equipment;

[0010] Step 5: Repeat steps 2-4 until a water-cutting curtain trench section is excavated to the designed depth, and the excavation depth is within 550-1000 mm of the impermeable stratum;

[0011] Step 6: The waste slag material is transferred to the aggregate preparation device, and the waste slag material is crushed into gravel with different gradations of particle size of 4.74mm to 40mm and machine-made sand with particle size less than 4.75mm, and transported to the anti-seepage material preparation device;

[0012] Step 7: The aggregate configuration device weighs according to the ratio requirements. The mass ratio of crushed stone, machine-made sand and natural sand is 1.0-1.5:0.6-0.9:0.1-0.4. The crushed stone, machine-made sand and natural sand are added, and the mixed aggregate is poured into the mixing device;

[0013] Step 8: The cylinder of the mixing device receives mixed aggregate, cement fly ash slurry and waste mud, wherein the cement fly ash slurry ratio is 0.5-1.0:1.0, the cement: fly ash ratio is 16-23:3-21, and the prepared cement fly ash slurry is 0.32-0.4m 3 / Each cubic meter of anti-seepage material and waste mud shall be 0.026m 3 / Each cubic meter of anti-seepage material, the balance is mixed aggregate, and the prepared anti-seepage material enters the pumping device;

[0014] Step 9: The pumping device pumps the evenly mixed anti-seepage material into the pouring device on the excavation trench section of the water cut-off curtain.

[0015] Step 10: Cast the wall of the curtain trough section to the designed elevation.

[0016] Step 11: Repeat steps 1 to 10, and construct the water-cutting curtain wall section by section at the designed curtain position, and finally form a continuous water-cutting curtain wall.

[0017] The device used in the above-mentioned in-situ sand and pebble anti-seepage material preparation and water-cutting curtain construction method includes an aggregate preparation device, an aggregate configuration device, a stirring device, a pumping device and a pouring device. The aggregate preparation device and the aggregate configuration device are connected by a conveyor belt frame. The discharge port of the aggregate configuration device is arranged above the feed port of the stirring device. The discharge port of the stirring device is located above the feed port of the pumping device. The pumping device is connected to the feed port of the pouring device through a pumping pipe.

[0018] The above-mentioned aggregate preparation device crushes and screens the pebbles and sand produced in the process of forming the trench of the water-cutting curtain. The pebbles and gravel are crushed into crushed stones and machine-made sand of different particle sizes in the aggregate preparation device. Then, the crushed stones, machine-made sand and natural sand can be mixed into the raw materials required for the anti-seepage material according to the design requirements.

[0019] The above-mentioned aggregate configuration device can configure crushed stone and machine-made sand of different grades according to the technical parameter requirements of the anti-seepage material, weigh and add crushed stone, machine-made sand and natural sand according to the designed ratio requirements, and can mix the crushed stone, machine-made sand and natural sand (in the formation) added according to the ratio requirements evenly.

[0020] The above-mentioned mixing device can mix aggregate, cement fly ash slurry and waste mud evenly according to design requirements, and prepare anti-seepage material with good performance under the cutting, mixing and conveying action of the mixing shaft, and enter the pumping device through the anti-seepage material discharge port, and be pumped to the excavated trench section of the water-cutting curtain to form an in-situ water-cutting curtain wall.

[0021] Compared with the existing technology, it has the following advantages:

[0022] 1. The in-situ sand and gravel anti-seepage material preparation device for water-cutting curtain adopts a universal device structure for rational connection, with simple structure, convenient operation, practicality and reliability;

[0023] 2. It effectively solves the waste of sand and gravel produced by excavation, reduces the demand for raw materials such as river sand, crushed stone or pebbles for anti-seepage materials, avoids the phenomenon of destroying the ecological environment by mining raw materials such as river sand, crushed stone or pebbles, and protects the ecological environment.

[0024] 3. The anti-seepage material makes full use of the large amount of waste materials such as sand, pebbles and mud generated during the construction of the water-cutting curtain, reducing the cost of transporting the waste, realizing the harmless utilization of solid waste resources, and reducing the project cost. The project cost can be reduced by more than 25%, while avoiding the problems of waste stacking occupying land and polluting the environment.

[0025] 4. The in-situ sand and gravel anti-seepage material preparation device realizes the continuous preparation of anti-seepage materials on the construction site. The time from the completion of the preparation of the anti-seepage materials to the pumping to the excavation trench section of the water-cutting curtain is less than 5 minutes, which solves the problem of long-distance transportation of anti-seepage materials, shortens the transportation time of anti-seepage materials, reduces material costs, reduces transportation costs, ensures the safety of on-site operations, and improves the performance of the anti-seepage materials of the water-cutting curtain, construction efficiency and water-cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The schematic diagram of the structure of the aggregate preparation device of the present invention is shown.

[0027] Figure 2The schematic diagram of the structure of the aggregate configuration device, the stirring device and the pumping device of the present invention is shown.

[0028] Figure 3 A schematic diagram showing the crystal trough construction of the pouring device of the present invention is shown.

[0029] Figure 4 A schematic diagram of a water cut-off curtain being constructed according to the present invention is shown.

[0030] Figure 5 A schematic diagram of a water-cutting curtain constructed according to the present invention is shown.

[0031] Reference numerals:

[0032] 1. Aggregate preparation device, 1-1. Receiving hopper, 1-2. Power system, 1-3. Crusher, 1-4. Conveyor belt, 1-5. Support bracket, 2. Aggregate configuration device, 2-1. Aggregate hopper, 2-2. Support column, 2-3. Aggregate discharge port, 2-4. Weighing system, 3. Stirring device, 3-1. Cylinder, 3-2. Support frame, 3-3. Stirring shaft, 3-4. Transmission system, 3-5. Waste mud input port, 3 -6. Cement fly ash slurry input port, 3-7. Anti-seepage material discharge port, 4. Pumping device, 4-1. Hopper, 4-2. Pumping main unit, 4-3. Pump outlet, 5. Pouring device, 5-1. Anti-seepage material hopper, 5-2. Wire rope, 5-3. Support frame, 5-4. Conduit, 6. Pumping pipe, 7. Excavation trench section, 8. Water-blocking curtain, 9. Trenching equipment, 10. Ground transportation equipment, 11. Sand and gravel formation, 12. Water-proof formation. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0034] According to the basic relationship formula and empirical value of anti-seepage concrete, the relative relationship of each admixture can be calculated. The basic relationship formula is as follows:

[0035] M 砂 +M 石 =V0-M w -M c -M p -M f (1)

[0036] M 砂 =(M 砂 +M 石 )×s (2)

[0037] M w =(M c +M p +Mf )×n (3)

[0038] According to the basic relationship, we can get the calculated relationship:

[0039]

[0040]

[0041]

[0042]

[0043] In the above formulas, V0 is the assumed bulk density of the anti-seepage concrete, kg / m 3 ;M 砂 、M 砂 、M w 、M c 、M p 、M f 1m respectively 3 The mass of sand, gravel, water, cement, bentonite and fly ash in anti-seepage concrete, kg; s is the sand ratio, which is controlled at about 50%; n is the water-cement ratio, which is controlled between 0.6 and 0.8.

[0044] From formula 4 to formula 7, we can know that the bulk density of anti-seepage concrete V0 and the mass of water M w After the water-cement ratio n and sand ratio s are determined, the 1m 3 The quality of sand in anti-seepage concrete M 砂 、The mass of the stone M 砂 , the quality of cement M c , the quality of bentonite M p , the mass of fly ash M f .

[0045] 1m 3 Price of anti-seepage concrete 砼 It is mainly composed of the prices of sand, gravel, cement, bentonite and fly ash in concrete. 1m 3 The price of anti-seepage concrete is

[0046] P 砼 =P 砂 +P 石 +P c +P p +P f (8)

[0047] Where P 砂 , P 石 , P c , P p and P f 1m respectively3 Prices of sand, gravel, cement, bentonite and fly ash in anti-seepage concrete.

[0048] That is 1m 3 The price of anti-seepage concrete is

[0049] P 砼 =p 砂 ×M 砂 +p 石 ×M 石 +p c ×M c +p p ×M p +p f ×M f (9)

[0050] where p 砂 、p 石 、p c 、p p 、p f These are the unit prices of sand, gravel, cement, bentonite and fly ash respectively.

[0051] If the sand, pebbles and rocks produced in the process of curtain anti-seepage wall trenching are used to prepare the sand and gravel required for anti-seepage materials at the construction site, and the waste mud of curtain trenching wall protection is used as bentonite material, then the mass M in the anti-seepage concrete 砂 Sand, quality M 砂 Stone, quality M p The price of bentonite is close to zero, so the 1m 3 The price of anti-seepage concrete is

[0052] P 砼 '=0×M 砂 +0×M 石 +0×M p +p c ×M c +p f ×M f (10)

[0053] From Announcement 10, we can see that 1m 3 Price of anti-seepage concrete 砼 'Mainly composed of cement and fly ash, it can be seen that P 砼 '<P 砼 Therefore, the use of sand, pebbles, rocks, and waste mud produced during the curtain anti-seepage wall trenching process can greatly reduce the price of anti-seepage concrete; reduce the cost of conventional anti-seepage membrane materials by extracting river sand, breaking rocks, and digging pits to obtain the required quality M 砂 Sand, quality M 砂 Stone, quality Mp Bentonite to avoid environmental damage.

[0054] The present invention provides a device used in an in-situ sand and pebble anti-seepage material preparation method, comprising an aggregate preparation device 1, an aggregate configuration device 2, a stirring device 3, a pumping device 4 and a pouring device 5, wherein the aggregate preparation device 1 and the aggregate configuration device 2 are connected via a conveyor belt, the discharge port of the aggregate configuration device 2 is arranged above the feed port of the stirring device 3, the discharge port of the stirring device 3 is located above the feed port of the pumping device 4, and the pumping device 4 is connected to the feed port of the pouring device 5 via a pumping pipe 6.

[0055] The use process of the device is as follows: the aggregate preparation device 1 crushes and screens the pebbles and sand produced in the process of forming the trench of the water-cutting curtain, crushes the pebbles into crushed stones and machine-made sand of different particle sizes, and then mixes the crushed stones, machine-made sand and natural sand into the raw materials required for the anti-seepage material according to the design requirements, and transports them to the aggregate configuration device. The aggregate configuration device 2 configures crushed stones of different grades according to the technical parameter requirements of the anti-seepage material, and weighs and adds crushed stones, machine-made sand and natural sand (in the stratum) according to the ratio requirements. The crushed stones, machine-made sand and natural sand (in the stratum) added according to the ratio requirements are mixed evenly and poured into the stirring device 3. After the aggregates are mixed evenly with the cement fly ash slurry and the waste mud, they are prepared into an anti-seepage material with good performance under the cutting, stirring and conveying action of the stirring shaft, and enter the pumping device through the anti-seepage material discharge port. The pumping device 4 contains the prepared anti-seepage material, and the anti-seepage material is further stirred in the hopper and transported to the trench section of the water-cutting curtain through the pumping pipe pump 6. The pouring device 5 at the notch of the excavated trench section receives the anti-seepage material transported by the pumping pipe, and the anti-seepage material is poured to the bottom of the water-cutting curtain trench section through the conduit. The conduit is lifted and removed according to the pouring amount and the wall lifting height.

[0056] The use of the device is further described in detail as follows:

[0057] The aggregate preparation device 1 includes a receiving hopper 1-1, a power system 1-2, a crusher 1-3, a conveyor belt 1-4, and a support bracket 1-5. The receiving hopper 1-1 is arranged on the upper part of the crusher 1-3, the power system 1-2 drives the crusher 1-3 to work, the conveyor belt 1-4 connects the lower part of the crusher 1-3 and the aggregate configuration device 2, and the support bracket 1-4 supports the conveyor belt 1-4. The sand and gravel produced by the excavation of the trench section of the water cut-off curtain 8 are transported to the receiving hopper 1-1 by a transport vehicle and a forklift 10. The crusher 1-3, under the action of the power system, crushes and screens the gravel and sand produced in the trenching process of the trenching equipment 9. The gravel is crushed into crushed stones and machine-made sand of different grades under the action of the crusher 1-3, and is transported to the aggregate configuration device 2 through the conveyor belt 1-4.

[0058] The aggregate configuration device 2 includes an aggregate hopper 2-1, a support column 2-2, an aggregate discharge port 2-3, and a weighing system 2-4. The aggregate hopper 2-1 is provided on the upper part of the support column 2-2, the aggregate discharge port 2-3 is located below the aggregate hopper 2-1, and the weighing system 2-4 is located on the side of the aggregate hopper 2-1 to weigh the weight of the input aggregate in the aggregate hopper. The aggregate configuration device 2 configures gravel of different grades according to the technical parameter requirements of the anti-seepage material, receives the aggregate transported by the conveyor belt 1-4 through the aggregate hopper 2-1, and the weighing system 2-4 weighs and adds gravel, machine-made sand and natural sand (in the formation) according to the ratio requirements. When the amount of gravel, machine-made sand and natural sand (in the formation) added reaches the design requirements, the aggregate discharge port 2-3 is opened, and the mixed aggregate that meets the ratio requirements is poured into the stirring device 3.

[0059] The stirring device 3 includes a cylinder 3-1, a support frame 3-2, a stirring shaft 3-3, a transmission system 3-4, a waste mud input port 3-5, a cement fly ash slurry input port 3-6, and an anti-seepage material discharge port 3-7. The cylinder 3-1 is mounted on the upper part of the support frame 3-2. One or two stirring shafts 3-3 are arranged in the cylinder 3-1. The stirring shaft 3-3 is driven to rotate by the transmission system 3-4. Blades are arranged at intervals on the stirring shaft 3-3 to mix, stir, and transport the anti-seepage material. A waste mud input port 3-5 and a cement fly ash slurry input port 3-6 are arranged at the front end of the cylinder 3-1, and an anti-seepage material discharge port 3-7 is arranged at the end of the cylinder 3-1. The cylinder 3-1 receives the mixed aggregate poured into the aggregate discharge port 2-3, and the cement fly ash slurry and the waste mud enter the cylinder 3-1 through the cement fly ash slurry input port 3-6 and the waste mud input port 3-5 respectively. Aggregate, cement fly ash slurry and waste mud are mixed at the front end of the cylinder 3-1, and are prepared into an anti-seepage material with good performance under the cutting, stirring and conveying action of the stirring shaft 3-3. The blades of the stirring shaft 3 mix and stir the paste material evenly and convey it to the rear end of the cylinder 3-1. The anti-seepage material that meets the technical requirements enters the pumping device 4 through the anti-seepage material discharge port 3-7.

[0060] The pumping device 4 includes a hopper 4-1, a pumping main unit 4-2, and a pump outlet 4-3. The hopper 4-1 is located at the front end of the pumping device 4 and is used to hold the prepared anti-seepage material. The anti-seepage material can be further stirred in the hopper 4-1. The pump outlet 4-3 is located below the hopper 4-1, and the pumping main unit 4-2 is arranged at the other end of the pumping device 4. The anti-seepage material enters the hopper 4-1 of the pumping device 4 from the anti-seepage material discharge port 4-3, and after being stirred evenly, it is controlled by the pumping main unit 4-2 and enters the pumping pipe 6 through the pump outlet 4-3, and then is pumped to the excavated groove section of the water cut-off curtain 8.

[0061] The pumping pipe 6 is a seamless steel pipe or a steel hose with an inner diameter of 125 mm or 150 mm. The pumping pipe 6 connects the pump outlet 4-3 and the anti-seepage material hopper 5-1, and transports the anti-seepage material pumped out by the pumping device 4 to the anti-seepage material hopper 5-1.

[0062] The pouring device 5 includes an anti-seepage material hopper 5-1, a steel wire rope 5-2, a support frame 5-3, and a conduit 5-4. The support frame 5-3 is set up at the slot of the excavated water-cutting curtain 8 slot section. The anti-seepage material hopper 5-1 is suspended on the upper part of the support frame 5-3 by the steel wire rope 5-2. The lower part of the anti-seepage material hopper 5-1 is connected to the conduit 5-4, and the conduit 5-4 is connected to the slot section section by section from the bottom of the slot section. The anti-seepage material hopper 5-1 receives the anti-seepage material delivered by the pumping pipe 6. Under the dual effects of gravity and the lifting of the anti-seepage material hopper 5-1, the anti-seepage material is poured to the bottom of the water-cutting curtain slot section through the conduit 5-4. The conduit 5-4 is lifted and disassembled according to the pouring amount and the wall lifting height, and finally the wall of the slot section of the water-cutting curtain 8 is poured to the designed elevation.

[0063] Embodiment 1:

[0064] Step 1: According to the engineering geology and hydrogeology characteristics of the open-pit coal mine, the position of the water-cutting curtain 8 is determined. The bottom of the water-cutting curtain 8 is located in the impermeable layer, and the open-pit mine is enclosed in the water-cutting curtain 8 .

[0065] Step 2: Use trenching equipment 9 to excavate a trench section with a width of 600mm for the water-cutting curtain 8. The excavation depth is not less than 2m to enter the impermeable stratum 12, and the natural sand, pebbles, gravel and other stratum 11 materials in the trench section are lifted into the ground transportation equipment 10.

[0066] Step 3: Inject bentonite slurry into the excavated trench section to protect the wall, maintain the upright stability of the trench section, and avoid collapse of the strata within the trench.

[0067] Step 4: The natural sand, pebbles, gravel and other ground materials 11 excavated from the trench section are transported to the aggregate preparation device 1 by the transport vehicle 10 .

[0068] Step 5: Repeat steps 2 to 4 until a water-cutting curtain trench section is excavated to the designed depth, and the excavation depth is not less than 2 m into the impermeable stratum 12.

[0069] Step 6: The natural sand, pebbles, gravels and other ground materials 11 are transferred to the receiving hopper 1-1 of the aggregate preparation device 1. According to the technical parameter requirements of the anti-seepage material, the crusher 1-3, driven by the power system 1-2, crushes the pebbles and gravels into crushed stones or pebbles with a diameter not greater than 3 cm and medium sand with a particle size of 0.25-0.5 mm. The crushed stones, machine-made sand and natural sand (in the ground) that meet the technical parameter requirements are transported to the anti-seepage material configuration device 2 through the conveyor belt 1-4.

[0070] Step 7: The aggregate configuration device 2 configures 880 kg of crushed stone with a particle size not greater than 3 cm, 720 kg of machine-made sand and natural sand (in the stratum) in each cubic meter of anti-seepage material according to the anti-seepage material mix ratio. The aggregate conveyed by the conveyor belt 1-4 is received by the aggregate hopper 2-1, and the weighing system 2-2 weighs according to the ratio requirements and adds crushed stone, machine-made sand and natural sand (in the stratum). The mass ratio of crushed stone, machine-made sand and natural sand (in the stratum) is 1.5:0.6:0.4. When the amount of crushed stone, machine-made sand and natural sand added reaches the design requirements, the aggregate discharge port 2-3 is opened, and the mixed aggregate that meets the ratio requirements is poured into the mixing device 3.

[0071] Step 8: The cylinder 3-1 of the mixing device 3 receives the mixed aggregate poured into the aggregate discharge port 2-3. The cement fly ash slurry ratio is 0.7:1 in water-cement ratio and 16:21 in cement:fly ash ratio. 0.4m 3 / Each cubic meter of anti-seepage material enters the cylinder 3-1 from the cement fly ash slurry inlet; waste slurry 0.026m 3 / Each cubic meter of anti-seepage material enters the cylinder 3-1 from the waste mud input port 3-5. The amount of mixed aggregate in this embodiment is 0.574m 3 / per cubic meter of anti-seepage material. Aggregates, cement fly ash slurry and waste mud are mixed at the front end of the cylinder 3-1, and the transmission system 3-4 drives the stirring shaft 3-3 to rotate. Blades are evenly arranged on the stirring shaft 3-3 to mix and stir the paste materials evenly and transport them to the rear end of the cylinder 3-1. Under the cutting, stirring and conveying action of the stirring shaft 3-3, anti-seepage materials with good performance are prepared. The anti-seepage materials that meet the technical requirements enter the pumping device 4 through the anti-seepage material discharge port 3-7.

[0072] Step 9: The hopper 4-1 of the pumping device 4 receives the anti-seepage material discharged from the anti-seepage material discharge port 3-7, and the pumping host 4-2 controls the stirring shaft in the hopper 4-1 to stir the anti-seepage material in the hopper. After the anti-seepage material is stirred evenly, it enters the pumping pipe 6 through the pump outlet 4-3 and is then pumped into the pouring device 5 on the excavation slot section 7 of the water-blocking curtain 8. The time from the completion of the preparation of the anti-seepage material to its pumping to the excavation slot section of the water-blocking curtain 8 is less than 5 minutes.

[0073] Step 10: The pouring device 5 is set up at the slot of the excavated water-cutting curtain 8. The anti-seepage material enters the anti-seepage material hopper 5-1 through the pumping pipe 6. Under the dual effects of gravity and the lifting and shaking of the anti-seepage material hopper 5-1, the anti-seepage material is poured to the bottom of the slot of the water-cutting curtain 8 through the conduit 5-4. The conduit 5-4 is lifted and removed according to the pouring amount and the wall lifting height, and finally the wall of the slot of the water-cutting curtain 8 is poured to the following height: Figure 4 Design elevations shown.

[0074] Step 11: Repeat steps 2 to 10 to build the water-cutting curtain 8 wall section by section at the designed curtain position, and finally form the following Figure 5 The continuous water-cutting curtain 8 wall shown effectively blocks the penetration of groundwater outside the curtain 8 into the inside of the curtain 8 .

[0075] Table 1 Performance of the anti-seepage material prepared in Example 1

[0076]

[0077] Embodiment 2:

[0078] Step 1: According to the characteristics of the pollutant diffusion prevention project, determine the position of the water-cutting curtain 8. The bottom of the water-cutting curtain 8 is generally located in the waterproof layer, and the pollutant diffusion area is confined inside the water-cutting curtain.

[0079] Step 2: Use trenching equipment 9 to dig a trench section with a width of 800 mm for the water-cutting curtain 8, and lift the natural sand, pebbles, gravel and other stratum materials in the trench section into the ground transportation equipment 10.

[0080] Step 3: Inject mud into the excavated trench section to protect the wall, maintain the stability of the trench section, and avoid stratum collapse in the trench.

[0081] Step 4: The natural sand, pebbles, gravel and other ground materials excavated in the trench section are transported to the aggregate preparation device 1 by the transport vehicle 10 .

[0082] Step 5: Repeat steps 2 to 4 until a water-cutting curtain trench section is excavated to the designed depth, and the excavation depth is not less than 2 m into the impermeable stratum 12.

[0083] Step 6: Natural sand, pebbles, gravel and other ground materials are transferred to the receiving hopper 1-1 of the aggregate preparation device 1. According to the technical parameter requirements of the anti-seepage material, the crusher 1-3, driven by the power system 1-2, crushes the pebbles and gravels into crushed stones or pebbles with a diameter not greater than 3 cm and medium sand with a particle size of 0.25-0.5 mm. The crushed stones, machine-made sand and natural sand (in the ground) that meet the technical parameter requirements are transported to the anti-seepage material configuration device 2 through the conveyor belt 1-4.

[0084] Step 7: The aggregate configuration device 2 configures 880 kg of crushed stone with a particle size not greater than 3 cm, 720 kg of machine-made sand and natural sand (in the stratum) in each cubic meter of the anti-seepage material according to the anti-seepage material mix ratio. The aggregate hopper 2-1 receives the aggregate conveyed by the conveyor belt 1-4, and the weighing system 2-2 weighs and adds crushed stone, machine-made sand and natural sand (in the stratum) according to the ratio requirements. The mass ratio of crushed stone, machine-made sand and natural sand (in the stratum) is 1.4:0.7:0.3. When the amount of crushed stone, machine-made sand and natural sand added reaches the design requirements, the aggregate discharge port 2-3 is opened, and the mixed aggregate that meets the ratio requirements is poured into the mixing device 3.

[0085] Step 8: The cylinder 3-1 of the mixing device 3 receives the mixed aggregate poured from the aggregate discharge port 2-3. The cement fly ash slurry ratio is 0.7:1 in water-cement ratio and 23:8 in cement: fly ash ratio. 3 / Each cubic meter of anti-seepage material enters the cylinder 3-1 from the cement fly ash slurry inlet; waste slurry 0.026m 3 Each cubic meter of anti-seepage material enters the cylinder 3-1 from the waste mud input port 3-5. Aggregates, cement fly ash slurry and waste mud are mixed at the front end of the cylinder 3-1, and the transmission system 3-4 drives the stirring shaft 3-3 to rotate. Blades are evenly arranged on the stirring shaft 3-3 to mix and stir the paste materials evenly and transport them to the rear end of the cylinder 3-1. Under the cutting, stirring and conveying action of the stirring shaft 3-3, anti-seepage materials with good performance are prepared. The anti-seepage materials that meet the technical requirements enter the pumping device 4 through the anti-seepage material discharge port 3-7.

[0086] Step 9: The hopper 4-1 of the pumping device 4 receives the anti-seepage material discharged from the anti-seepage material discharge port 3-7, and the pumping host 4-2 controls the stirring shaft in the hopper 4-1 to stir the anti-seepage material in the hopper. After the anti-seepage material is stirred evenly, it enters the pumping pipe 6 through the pump outlet 4-3 and is then pumped into the pouring device 5 on the excavation slot section 7 of the water-blocking curtain 8. The time from the completion of the preparation of the anti-seepage material to its pumping to the excavation slot section of the water-blocking curtain 8 is less than 5 minutes.

[0087] Step 10: The pouring device 5 is set up at the slot of the excavated water-cutting curtain 8. The anti-seepage material enters the anti-seepage material hopper 5-1 through the pumping pipe 6. Under the dual effects of gravity and the lifting and shaking of the anti-seepage material hopper 5-1, the anti-seepage material is poured to the bottom of the slot of the water-cutting curtain 8 through the conduit 5-4. The conduit 5-4 is lifted and removed according to the pouring amount and the wall lifting height, and finally the wall of the slot of the water-cutting curtain 8 is poured to the following height: Figure 4 Design elevations shown.

[0088] Step 11: Repeat steps 2 to 10 to build the water-cutting curtain 8 wall section by section at the designed curtain position, and finally form the following Figure 5 The continuous water-cutting curtain 8 wall shown effectively blocks the penetration of groundwater outside the curtain 8 into the inside of the curtain 8 .

[0089] Table 2 Performance of the anti-seepage material prepared in Example 2

[0090]

[0091] Embodiment 3:

[0092] Step 1: According to the engineering geology and hydrogeology characteristics of the open-pit coal mine, the position of the water-cutting curtain 8 is determined. The bottom of the water-cutting curtain 8 is generally located in the impermeable layer, and the open-pit mine is enclosed inside the water-cutting curtain.

[0093] Step 2: Use trenching equipment 9 to dig a trench section with a width of 700 mm for the water-cutting curtain 8, and lift the natural sand, pebbles, gravel and other stratum materials in the trench section into the ground transportation equipment 10.

[0094] Step 3: Inject mud into the excavated trench section to protect the wall, maintain the upright stability of the trench section, and avoid the collapse of the strata in the trench.

[0095] Step 4: The natural sand, pebbles, gravel and other ground materials 11 excavated from the trench section are transported to the aggregate preparation device 1 by the transport vehicle 10 .

[0096] Step 5: Repeat steps 2 to 4 until a water-cutting curtain trench section is excavated to the designed depth, and the excavation depth is not less than 2 m into the impermeable stratum 12.

[0097] Step 6: The natural sand, pebbles, gravels and other ground materials 11 are transferred to the receiving hopper 1-1 of the aggregate preparation device 1. According to the technical parameter requirements of the anti-seepage material, the crusher 1-3, driven by the power system 1-2, crushes the pebbles and gravels into crushed stones or pebbles with a diameter not greater than 3 cm and medium sand with a particle size of 0.25-0.5 mm. The crushed stones, machine-made sand and natural sand (in the ground) that meet the technical parameter requirements are transported to the anti-seepage material configuration device 2 through the conveyor belt 1-4.

[0098] Step 7: The aggregate configuration device 2 configures 880 kg of crushed stone with a particle size not greater than 3 cm, 720 kg of machine-made sand and natural sand (in the stratum) in each cubic meter of the anti-seepage material according to the anti-seepage material mix ratio. The aggregate hopper 2-1 receives the aggregate conveyed by the conveyor belt 1-4, and the weighing system 2-2 weighs and adds crushed stone, machine-made sand and natural sand (in the stratum) according to the ratio requirements. The mass ratio of crushed stone, machine-made sand and natural sand (in the stratum) is 1.2:0.8:0.2. When the amount of crushed stone, machine-made sand and natural sand added reaches the design requirements, the aggregate discharge port 2-3 is opened, and the mixed aggregate that meets the ratio requirements is poured into the mixing device 3.

[0099] Step 8: The cylinder 3-1 of the mixing device 3 receives the mixed aggregate poured into the aggregate discharge port 2-3. The cement fly ash slurry ratio is 0.7:1 in water-cement ratio and 22:10 in cement:fly ash ratio. 0.34m 3 / Each cubic meter of anti-seepage material enters the cylinder 3-1 from the cement fly ash slurry inlet; waste slurry 0.026m 3Each cubic meter of anti-seepage material enters the cylinder 3-1 from the waste mud input port 3-5. Aggregates, cement fly ash slurry and waste mud are mixed at the front end of the cylinder 3-1, and the transmission system 3-4 drives the stirring shaft 3-3 to rotate. Blades are evenly arranged on the stirring shaft 3-3 to mix and stir the paste materials evenly and transport them to the rear end of the cylinder 3-1. Under the cutting, stirring and conveying action of the stirring shaft 3-3, anti-seepage materials with good performance are prepared. The anti-seepage materials that meet the technical requirements enter the pumping device 4 through the anti-seepage material discharge port 3-7.

[0100] Step 9: The hopper 4-1 of the pumping device 4 receives the anti-seepage material discharged from the anti-seepage material discharge port 3-7, and the pumping host 4-2 controls the stirring shaft in the hopper 4-1 to stir the anti-seepage material in the hopper. After the anti-seepage material is stirred evenly, it enters the pumping pipe 6 through the pump outlet 4-3 and is then pumped into the pouring device 5 on the excavation slot section 7 of the water-blocking curtain 8. The time from the completion of the preparation of the anti-seepage material to its pumping to the excavation slot section of the water-blocking curtain 8 is less than 5 minutes.

[0101] Step 10: The pouring device 5 is set up at the slot of the excavated water-cutting curtain 8. The anti-seepage material enters the anti-seepage material hopper 5-1 through the pumping pipe 6. Under the dual effects of gravity and the lifting and shaking of the anti-seepage material hopper 5-1, the anti-seepage material is poured to the bottom of the slot of the water-cutting curtain 8 through the conduit 5-4. The conduit 5-4 is lifted and removed according to the pouring amount and the wall lifting height, and finally the wall of the slot of the water-cutting curtain 8 is poured to the following height: Figure 4 Design elevations shown.

[0102] Step 11: Repeat steps 2 to 10 to build the water-cutting curtain 8 wall section by section at the designed curtain position, and finally form the following Figure 5 The continuous water-cutting curtain 8 wall shown effectively blocks the penetration of groundwater outside the curtain 8 into the inside of the curtain 8 .

[0103] Table 3 Performance of the anti-seepage material prepared in Example 3

[0104]

[0105] Embodiment 4:

[0106] Step 1: Determine the position of the cut-off curtain 8 according to the engineering geology and hydrogeology characteristics of the underground coal mine. The bottom of the cut-off curtain 8 is generally located in a stable impermeable layer, and the underground coal mine or mining working face is enclosed inside the cut-off curtain to isolate the hydraulic connection between the underground coal mine or mining working face and the outer strata.

[0107] Step 2: Use trenching equipment 9 to dig a trench section with a water-cutting curtain 8 of 550 mm width, and lift the natural sand, pebbles, gravel and other stratum materials 11 in the trench section into the ground transportation equipment 10.

[0108] Step 3: Inject mud into the excavated trench section to protect the wall, maintain the upright stability of the trench section, and avoid the collapse of the strata in the trench.

[0109] Step 4: The natural sand, pebbles, gravel and other ground materials excavated in the trench section are transported to the aggregate preparation device 1 by the transport vehicle 10 .

[0110] Step 5: Repeat steps 2 to 4 until a water-cutting curtain trench section is excavated to the designed depth, and the excavation depth is not less than 2 m into the impermeable stratum 12.

[0111] Step 6: Natural sand, pebbles, gravel and other ground materials are transferred to the receiving hopper 1-1 of the aggregate preparation device 1. According to the technical parameter requirements of the anti-seepage material, the crusher 1-3, driven by the power system 1-2, crushes the pebbles and gravels into crushed stones or pebbles with a diameter not greater than 3 cm and medium sand with a particle size of 0.25-0.5 mm. The crushed stones, machine-made sand and natural sand (in the ground) that meet the technical parameter requirements are transported to the anti-seepage material configuration device 2 through the conveyor belt 1-4.

[0112] Step 7: The aggregate configuration device 2 configures 960 kg of crushed stone with a particle size not greater than 3 cm, 640 kg of machine-made sand and natural sand (in the stratum) in each cubic meter of the anti-seepage material according to the anti-seepage material mix ratio. The aggregate hopper 2-1 receives the aggregate conveyed by the conveyor belt 1-4, and the weighing system 2-2 weighs and adds crushed stone, machine-made sand and natural sand (in the stratum) according to the ratio requirements. The mass ratio of crushed stone, machine-made sand and natural sand (in the stratum) is 1.0:0.9:0.1. When the amount of crushed stone, machine-made sand and natural sand added reaches the design requirements, the aggregate discharge port 2-3 is opened, and the mixed aggregate that meets the ratio requirements is poured into the mixing device 3.

[0113] Step 8: The cylinder 3-1 of the mixing device 3 receives the mixed aggregate poured into the aggregate discharge port 2-3. The cement fly ash slurry ratio is 0.7:1 in water-cement ratio and 22:3 in cement: fly ash ratio. 0.26m 3 / Each cubic meter of anti-seepage material enters the cylinder 3-1 from the cement fly ash slurry inlet; waste slurry 0.026m 3 Each cubic meter of anti-seepage material enters the cylinder 3-1 from the waste mud input port 3-5. Aggregates, cement fly ash slurry and waste mud are mixed at the front end of the cylinder 3-1, and the transmission system 3-4 drives the stirring shaft 3-3 to rotate. Blades are evenly arranged on the stirring shaft 3-3 to mix and stir the paste materials evenly and transport them to the rear end of the cylinder 3-1. Under the cutting, stirring and conveying action of the stirring shaft 3-3, anti-seepage materials with good performance are prepared. The anti-seepage materials that meet the technical requirements enter the pumping device 4 through the anti-seepage material discharge port 3-7.

[0114] Step 9: The hopper 4-1 of the pumping device 4 receives the anti-seepage material discharged from the anti-seepage material discharge port 3-7, and the pumping host 4-2 controls the stirring shaft in the hopper 4-1 to stir the anti-seepage material in the hopper. After the anti-seepage material is stirred evenly, it enters the pumping pipe 6 through the pump outlet 4-3 and is then pumped into the pouring device 5 on the water-cutting curtain excavation slot section 7. The time from the completion of the preparation of the anti-seepage material to its pumping to the water-cutting curtain 8 excavation slot section is less than 5 minutes.

[0115] Step 10: The pouring device 5 is set up at the slot of the excavated water-cutting curtain 8. The anti-seepage material enters the anti-seepage material hopper 5-1 through the pumping pipe 6. Under the dual effects of gravity and the lifting and shaking of the anti-seepage material hopper 5-1, the anti-seepage material is poured to the bottom of the slot of the water-cutting curtain 8 through the conduit 5-4. The conduit 5-4 is lifted and removed according to the pouring amount and the wall lifting height, and finally the wall of the slot of the water-cutting curtain 8 is poured to the following height: Figure 4 Design elevations shown.

[0116] Step 11: Repeat steps 2 to 10 to build the water-cutting curtain 8 wall section by section at the designed curtain position, and finally form the following Figure 5 The continuous water-cutting curtain 8 wall shown effectively blocks the penetration of groundwater outside the curtain 8 into the inside of the curtain 8 .

[0117] Table 4 Performance of the anti-seepage material prepared in Example 4

[0118]

[0119] Comparative Example:

[0120] Step 1: According to the engineering geology and hydrogeology characteristics of the open-pit coal mine, the position of the water-cutting curtain 8 is determined. The bottom of the water-cutting curtain 8 is generally located in the impermeable layer, and the open-pit mine is enclosed in the water-cutting curtain 8 .

[0121] Step 2: Use trenching equipment 9 to excavate a trench section with a width of 600mm for the water-cutting curtain 8. The excavation depth is not less than 2m to enter the impermeable stratum 12, and the natural sand, pebbles, gravel and other stratum 11 materials in the trench section are lifted into the ground transportation equipment 10.

[0122] Step 3: Inject bentonite slurry into the excavated trench section to protect the wall, maintain the upright stability of the trench section, and avoid stratum collapse in the trench.

[0123] Step 4: The natural sand, pebbles, gravel and other stratum materials 11 excavated from the trench section are transported to the stockpile yard by the transport vehicle 10 and stored as waste residue.

[0124] Step 5: Repeat steps 2 to 4 until a water-cutting curtain trench section is excavated to the designed depth, and the excavation depth is not less than 2 m into the impermeable stratum 12.

[0125] Step 6: The commercial mixing station prepares the anti-seepage material according to the ratio of Example 1, wherein each cubic meter of the anti-seepage material is configured with 880 kg of crushed stone with a particle size not greater than 3 cm and 720 kg of medium sand, the cement fly ash slurry ratio is 0.7:1 in water-cement ratio, and the cement: fly ash ratio is 16:21. The cement fly ash material is mixed with the crushed stone and medium sand, and water is added and stirred to prepare an anti-seepage material that meets the technical requirements.

[0126] Step 7: After the anti-seepage material is evenly mixed, it is transported by a tanker for about 40 minutes to the construction site, and is ready to be poured into the trench section of the water cut-off curtain 8 through a hopper. The time from the preparation of the anti-seepage material to the pouring of the trench section of the water cut-off curtain 8 is more than 40 minutes.

[0127] Step 8: The pouring device 5 is set up at the slot of the excavated water-blocking curtain 8. The anti-seepage material enters the anti-seepage material hopper 5-1 through the tank truck. Under the dual effects of gravity and the lifting and shaking of the anti-seepage material hopper 5-1, the anti-seepage material is poured to the bottom of the slot of the water-blocking curtain 8 through the conduit 5-4. The conduit 5-4 is lifted and removed according to the pouring amount and the wall lifting height, and finally the wall of the slot of the water-blocking curtain 8 is poured to the following height: Figure 4 Design elevations shown.

[0128] Step 9: Repeat steps 2 to 8, and build the water-cutting curtain 8 wall section by section at the designed curtain position, and finally form the following Figure 5 The continuous water-cutting curtain 8 wall shown effectively blocks the penetration of groundwater outside the curtain 8 into the inside of the curtain 8 .

[0129] Table 5 Performance of the anti-seepage material prepared in Example 5

[0130]

[0131] It can be clearly concluded from the above four embodiments and comparative examples that the in-situ sand and gravel anti-seepage material has good strength and anti-seepage performance. After the gravel and sand are crushed and screened at the construction site, they can be mixed with waste mud and cement fly ash slurry to prepare an economical and efficient water-cutting curtain anti-seepage material with a 28d strength of 6 to 8.6 MPa and a permeability coefficient of no more than 10 -7 cm / s. To ensure that the anti-seepage materials at the pouring site have the same slump, in order to overcome the loss over time, the anti-seepage materials prepared at the commercial mixing station require a larger water-cement ratio. The strength and permeability coefficient of the anti-seepage materials prepared in situ are better than those of the anti-seepage materials transported to the construction site by the commercial mixing station. At the same time, the in-situ sand and gravel anti-seepage materials realize the green and environmentally friendly utilization of waste materials on site, reduce the cost of sand and gravel in the anti-seepage materials, and greatly reduce the cost of anti-seepage materials on the basis of improving the performance of anti-seepage materials, reducing the material cost by 27% to 44%.

[0132] It can be seen that the advantages of the present invention are:

[0133] 1. The in-situ sand and pebble anti-seepage material preparation device for water-cutting curtain has a simple structure, convenient operation, practicality and reliability;

[0134] 2. It reduces the demand for raw materials such as river sand, gravel or pebbles for anti-seepage materials, avoids the phenomenon of mining raw materials such as river sand, gravel or pebbles to damage the ecological environment, and protects the ecological environment.

[0135] 3. The anti-seepage material makes full use of the large amount of waste materials such as sand, pebbles and mud generated during the construction of the water-cutting curtain, reducing the cost of transporting the waste, realizing the harmless utilization of solid waste resources, and avoiding the problems of waste stacking occupying land and polluting the environment.

[0136] 4. The in-situ sand and gravel anti-seepage material preparation device realizes the continuous preparation of anti-seepage materials on the construction site, solves the problem of long-distance transportation of anti-seepage materials, shortens the transportation time of anti-seepage materials, reduces material costs, reduces transportation costs, ensures the safety of on-site operations, and improves the performance of water-cutting curtain anti-seepage materials, construction efficiency and water-cutting effect.

[0137] It is obvious that the above description and record are only examples and are not intended to limit the disclosure, application or use of the present invention. Although the embodiments have been described in the embodiments and described in the drawings, the present invention is not limited to the specific examples of the teachings of the present invention as the best mode currently considered by the drawings and described in the embodiments, and the scope of the present invention will include any embodiment falling within the previous description and the attached claims.

Claims

1. A method for preparing an in-situ sand and gravel anti-seepage material and constructing a water-cutting curtain, characterized in that: The following steps are included in sequence: Step 1: According to the engineering geology and hydrogeology characteristics of the open-pit coal mine, the position of the water-cutting curtain (8) is determined, the bottom of the water-cutting curtain (8) is located in the aquiclude, and the open-pit mine is enclosed in the water-cutting curtain (8); Step 2: using trenching equipment (9) to excavate a trench section with a width of 600 mm for the water-blocking curtain (8), the excavation depth is not less than 2 m into the impermeable stratum (12), and the natural sand, pebbles and gravels in the trench section are lifted to the ground transportation equipment (10); Step 3: Inject bentonite slurry into the excavated trench section to protect the wall, maintain the vertical stability of the trench section, and avoid collapse of the trench layer; Step 4: The natural sand, pebbles and gravel excavated from the trough section are transported to the aggregate preparation device (1) via ground transportation equipment (10); Step 5: Repeat steps 2 to 4 until a water-cutting curtain trench section is excavated to the designed depth, and the excavation depth is not less than 2 m into the impermeable stratum (12); Step 6: natural sand, pebbles and gravel are transferred into the receiving hopper (1-1) of the aggregate preparation device (1). According to the technical parameter requirements of the anti-seepage material, the crusher (1-3) is driven by the power system (1-2) to crush the pebbles and gravel into crushed stones or pebbles with a diameter not greater than 3 cm and medium sand with a particle size of 0.25-0.5 mm; the crushed stones, machine-made sand and natural sand that meet the technical parameter requirements are transported to the aggregate preparation device (2) through the conveyor belt (1-4); Step 7: Aggregate preparation device (2) prepares 880 kg of crushed stone with a particle size not greater than 3 cm, and 720 kg of machine-made sand and natural sand in each cubic meter of anti-seepage material according to the mix ratio of the anti-seepage material; Aggregates conveyed by a conveyor belt (1-4) are received by an aggregate hopper (2-1), and a weighing system (2-2) weighs them according to the proportion requirements, and crushed stone, machine-made sand and natural sand are added; the mass ratio of crushed stone, machine-made sand and natural sand is 1.5:0.6:0.

4. When the amount of crushed stone, machine-made sand and natural sand added reaches the design requirements, an aggregate discharge port (2-3) is opened, and the mixed aggregate that meets the proportion requirements is poured into a mixing device (3); Step 8: The cylinder (3-1) of the mixing device (3) receives the mixed aggregate poured into the aggregate discharge port (2-3). The cement fly ash slurry ratio is 0.7:1 in water-cement ratio and 16:21 in cement:fly ash ratio. The prepared cement fly ash slurry is poured into the mixing device (3) at a rate of 0.4 m 3 / Each cubic meter of anti-seepage material enters the cylinder from the cement fly ash slurry inlet (3-1); waste slurry is 0.026m 3 Each cubic meter of anti-seepage material enters the cylinder (3-1) from the waste mud input port (3-5), the aggregate is mixed with cement fly ash slurry and waste mud at the front end of the cylinder (3-1), the transmission system (3-4) drives the stirring shaft (3-3) to rotate, blades are evenly arranged on the stirring shaft (3-3), the paste material is mixed and stirred evenly and transported to the rear end of the cylinder (3-1), and the anti-seepage material with good performance is prepared under the cutting, stirring and conveying action of the stirring shaft (3-3), and the anti-seepage material that meets the technical requirements enters the pumping device (4) through the anti-seepage material discharge port (3-7); Step 9: The hopper (4-1) of the pumping device (4) receives the anti-seepage material discharged from the anti-seepage material discharge port (3-7), and the pumping host (4-2) controls the stirring shaft in the hopper (4-1) to stir the anti-seepage material in the hopper. After the anti-seepage material is evenly stirred, it enters the pumping pipe (6) through the pump outlet (4-3) and is then pumped into the pouring device (5) on the excavated slot section (7) of the water-blocking curtain (8). The time from the completion of the preparation of the anti-seepage material to the pumping of the anti-seepage material to the excavated slot section of the water-blocking curtain (8) is less than 5 minutes. Step 10: The pouring device (5) is set up at the slot of the excavated water-blocking curtain (8), and the anti-seepage material enters the anti-seepage material hopper (5-1) through the pumping pipe (6). Under the dual effects of gravity and the lifting and shaking of the anti-seepage material hopper (5-1), the anti-seepage material is poured to the bottom of the slot of the water-blocking curtain (8) through the guide tube (5-4). The guide tube (5-4) is lifted and removed according to the pouring amount and the wall lifting height, and finally the wall of the slot of the water-blocking curtain (8) is poured to the elevation; Step 11: Repeat steps 2 to 10 to construct the water-cutting curtain (8) wall section by section at the designed curtain position, and finally form a continuous water-cutting curtain (8) wall to effectively block the penetration of groundwater outside the curtain (8) into the inside of the curtain (8).

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