Slow cooling field ground structure and construction method thereof

Abstract

The invention relates to a slow cooling field ground structure and a construction method thereof and a ground structure body. The ground structure body comprises a surface layer, a surface layer and a surface layer, wherein the surface layer is made of C35-grade cast-in-place concrete with the thickness of 350 mm and is internally provided with a double-layer two-way phi 16-at 250 reinforcing mesh; the ground structure has the beneficial effects that the uppermost layer of the ground structure body is C35-grade cast-in-place concrete with the thickness of 350 mm, the double-layer two-way phi 16 at 250 reinforcing mesh is arranged, and the surface layer has high compressive strength and crack resistance and can bear the weight of slag stacking and mechanical equipment in the slow cooling field production process; meanwhile, surface cracking is prevented under temperature change or external force impact, a 6% cement stable material base layer with the thickness being 300 mm is arranged below the surface layer, the compressive strength is not smaller than 4 MPa, the bearing capacity of the whole structure is further enhanced, after the cement base layer is compacted, high compactness is guaranteed, the structure can stably resist the softening effect of collapsible soil, and in addition, the structure can stably resist the collapsible soil; the cement mortar layer with the thickness of 20 mm below the base layer plays a role in leveling.

Description

Technical Field

[0001] The invention relates to the technical field of ground structures, and in particular to a slow cooling ground structure and a construction method thereof. Background Art

[0002] Slow cooling yards are usually used to treat industrial high-temperature waste, especially high-temperature slag produced in the metallurgical industry, such as copper tailings. This type of high-temperature waste needs to be slowly cooled to prevent thermal pollution to the surrounding environment, and it is also necessary to avoid the generation of harmful substances or structural damage during the cooling process.

[0003] In actual use, there are problems in the production practice of slag slow cooling field: first, the slope of the site is small, and the spraying water flows out slowly, which is easy to cause water accumulation or ice on the ground; second, the slag stone is highly permeable, and the surface water penetrates into the lower layer and gathers in the slag stone replacement layer, resulting in a collapsible silt layer that is soaked and deformed, and freezes and expands in winter, causing cracks and damage to the site's ground concrete structure; third, the slag bag spray water and slag leaching water are weakly acidic and contain a small amount of heavy metals, which flow into the ground along the surface gaps, causing soil and groundwater pollution. Summary of the invention

[0004] 1. Technical issues to be resolved In order to solve the above problems in the prior art, the present invention provides a slow cooling ground structure and a construction method thereof, which solve the problems of surface water accumulation, seepage deformation, structural cracking and environmental pollution in the slow cooling ground.

[0005] (II) Technical solution In order to achieve the above object, the main technical solutions adopted by the present invention are: The slow cooling ground structure and the construction method thereof include a ground structure body, wherein the ground structure body includes: Surface layer: 350mm thick C35 grade cast-in-place concrete, with double-layer bidirectional Φ16@250 steel mesh inside; Base layer: 300mm thick 6% cement stabilized material, compressive strength not less than 4MPa; Protective layer: 20mm thick cement mortar to protect the HDPE anti-seepage membrane; Waterproof layer: 400g / m² non-woven geotextile and 2mm thick HDPE anti-seepage membrane; Cushion: 300mm thick clay water stop layer to prevent water penetration; Replacement layer: Copper tailings-based inorganic mixed material, used to replace collapsible silt layer or soft soil layer, the replacement thickness is not less than 800 mm, the compaction coefficient is not less than 0.95, and the unconfined compressive strength is not less than 3MPa; A supporting mechanism is provided on the outside of the ground structure body, and the supporting mechanism includes a supporting frame, a supporting seat, a mounting rod, an alarm body, an outer reinforcing plate, an inner reinforcing plate, a base plate, a connecting bracket, a protective plate and a force measuring body. The outer side of the support frame is fixedly connected with the outer reinforcing plate, the inner side of the support frame is fixedly connected with the inner reinforcing plate, three base plates are fixedly embedded on the inner side of the support frame, the inner side of the support frame is snap-connected with the protective plate, three force measuring bodies are embedded on the inner wall of the protective plate, the outer side of the support frame is fixedly connected with a connecting bracket, the inner wall of the connecting bracket is hinged with a supporting seat, the middle part of the connecting bracket is fixedly embedded with a mounting rod, the tops of the three mounting rods are all equipped with alarm bodies, and the three alarm bodies are electrically connected to the three force measuring bodies respectively.

[0006] The copper tailings-based inorganic mixed material is prepared by mixing 50% to 60% of copper tailings, 30% to 40% of graded crushed stone, 6% to 8% of inorganic gelling material and 7% to 10% of water.

[0007] The HDPE anti-seepage membrane is welded by a wedge welding machine, the seam length is not less than 120 mm, and is verified by air tightness testing and destructive testing.

[0008] The compressive strength of the cement-stabilized material base is not less than 4 MPa, the compaction coefficient is not less than 0.97, and the cement content is 4% to 6%.

[0009] The construction method of a slag slow cooling ground structure according to any one of claims 1 to 4 comprises the following steps: S1: measurement, positioning and laying out; S2: earth excavation and foundation pit cleaning; S3: Layered compaction and slope finding of replacement layer; S4: Layered laying and compaction of cushion clay; S5: Laying and welding of HDPE anti-seepage membrane; S6: Smoothing of cement mortar of protective layer; S7: Compacting cement stabilized materials at the base; S8: Surface reinforcement binding and concrete pouring.

[0010] The compaction coefficient of the replacement layer is not less than 0.95, the unconfined compressive strength of the copper tailings-based inorganic mixed material is not less than 3MPa, and layered paving and mechanical compaction are adopted during construction.

[0011] The appearance integrity of the HDPE anti-seepage membrane needs to be checked before laying. The welding sequence is horizontal seams first, then other seams, and quality acceptance is carried out through air tightness testing and visual inspection.

[0012] The surface layer is constructed by skip-bin pouring method, the concrete is vibrated by mechanical vibration, the surface roughening depth is 0.6-0.8 mm, and the curing time is not less than 14 days.

[0013] (III) Beneficial effects The beneficial effects of the present invention are as follows: the top layer of the ground structure body is 350mm thick C35 grade cast-in-place concrete, equipped with a double-layer bidirectional Φ16@250 steel mesh. This surface layer has high compressive strength and crack resistance, and can withstand the weight of slag stacking and mechanical equipment in the slow cooling field production process, while preventing surface cracking under temperature changes or external force impacts. Below the surface layer is a 300mm thick 6% cement stabilized material base with a compressive strength of not less than 4MPa, which further enhances the bearing capacity of the overall structure. After compaction, the cement base ensures a high density, so that the structure can be stable Resist the softening effect of collapsible soil. In addition, the 20mm thick cement mortar layer under the base layer not only plays a leveling role, but also protects the HDPE anti-seepage membrane to prevent water seepage. In order to effectively prevent water penetration, the structure is designed with a waterproof layer, including 400g / m² non-woven geotextile and 2mm thick HDPE anti-seepage membrane. These two layers of materials are used together to form a solid barrier to prevent surface water or slag bag spray water from penetrating to deeper levels. In addition, the seams of the HDPE anti-seepage membrane are welded by a wedge welding machine to ensure its sealing, and have been tested for airtightness to ensure the reliability of the seams. In terms of waterproof design The 300mm thick clay water-stop layer is an important part of the structure. The low permeability of the clay material is used to prevent water from penetrating downward to the replacement layer. The replacement layer uses a copper tailings-based inorganic mixed material, which is a mixture of copper tailings, graded crushed stone, inorganic cementitious materials and water. The replacement thickness is not less than 800mm, the compaction coefficient is not less than 0.95, and the unconfined compressive strength is not less than 3MPa. Through this design, the collapsible silt layer or soft soil layer is replaced to ensure that the foundation will not deform or settle due to collapsing during long-term use. The design of the support mechanism further improves the safety and Monitoring capability: The support mechanism composed of support frame, force gauge and alarm can monitor the stress of the ground structure in real time, and promptly feedback any abnormal pressure or deformation to prevent ground cracking or collapse. When the force gauge detects changes in the ground structure itself, it can sound an alarm when an abnormality is found, reminding maintenance personnel to take corresponding measures. Overall, through the combination of multi-layer materials and careful anti-seepage and pressure-bearing design, a series of problems such as ground water accumulation, infiltration, structural cracking and groundwater pollution are solved, ensuring the long-term stable operation of the site, meeting the needs of industrial production, and reducing the impact on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 It is a structural exploded view of the protective plate part of the present invention; Figure 4 It is a cross-sectional view of the main body of the ground structure of the present invention; Figure 5 It is a schematic diagram of the process of the construction method part of the present invention.

[0015] [Description of Reference Numerals] 1. Ground structure body; 2. Base layer; 3. Support mechanism; 301. Support frame; 302. Support seat; 303. Mounting rod; 304. Alarm body; 305. Outer reinforcement plate; 306. Inner reinforcement plate; 307. Base plate; 308. Connecting bracket; 309. Protective plate; 310. Force gauge body; 4. Protective layer; 5. Waterproof layer; 6. Cushion layer; 7. Replacement layer; 8. Surface layer. DETAILED DESCRIPTION

[0016] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0017] Please refer to Figures 1 to 5 As shown, the slow cooling ground structure of the present invention includes a ground structure body 1, and the ground structure body 1 includes: Surface layer 8: 350mm thick C35 grade cast-in-place concrete with double-layer bidirectional Φ16@250 steel mesh inside. By improving the concrete grade and the reinforcement ratio of the internal steel bars, the wear resistance and crack resistance of the surface layer 8 of the site are effectively enhanced, and the corrosion resistance and durability of the concrete floor are improved; Base layer 2: 300mm thick 6% cement stabilized material, with a compressive strength of not less than 4MPa. As the main load-bearing structural layer, it not only effectively transfers the ground load, but also prevents the occurrence of surface water infiltration and groundwater rise, improves the water stability of the ground structure and improves its durability; Protective layer 4: 20mm thick cement mortar, to protect the HDPE anti-seepage membrane, prevent the HDPE anti-seepage membrane from being damaged during construction, and improve the bonding performance with the upper structure; Waterproof layer 5: 400g / m² non-woven geotextile and 2mm thick HDPE anti-seepage membrane, mainly to block surface water from penetrating into the underground soil layer, prevent soil and groundwater pollution, and also prevent the collapsible silt layer from being soaked and deformed and frozen and expanded in winter, causing cracks and damage to the concrete structure of the site ground; Pad 6: 300mm thick clay water-stop layer, which prevents water from penetrating, plays the role of preventing water flow, protecting and facilitating the laying of HDPE anti-seepage membrane; Replacement layer 7: Copper tailings-based inorganic mixed materials are used to replace collapsible silt layers or soft soil layers. The replacement thickness is not less than 800 mm, the compaction coefficient is not less than 0.95, and the unconfined compressive strength is not less than 3 MPa. Copper tailings-based inorganic mixed materials replace soft soil or collapsible loess foundation and slope adjustment (2%). The replacement thickness is determined by comprehensively considering the soil conditions of the foundation soil layer and the depth of the frozen layer, and is not less than 800 mm thick, the compaction coefficient is not less than 0.95, and the unconfined compressive strength is not less than 3 MPa. Copper tailings-based inorganic mixed materials are made of copper tailings, graded crushed stone, inorganic cementitious materials and water, which are compacted into a whole shape. They have good mechanical properties and plate properties, water stability and homogeneity. They are used to replace slag stones as collapsible silt layers or soft soil layers. They not only improve the overall strength of the structure below the cushion layer 6, but also effectively prevent water seepage and convergence, and improve the frost resistance, crack resistance and durability of the overall ground structure. A support mechanism 3 is provided on the outside of the ground structure body 1, and the support mechanism 3 includes a support frame 301, a support seat 302, a mounting rod 303, an alarm body 304, an outer reinforcing plate 305, an inner reinforcing plate 306, a base plate 307, a connecting bracket 308, a protective plate 309 and a force measuring device body 310. The outer side of the support frame 301 is fixedly connected with the outer reinforcing plate 305, the inner side of the support frame 301 is fixedly connected with the inner reinforcing plate 306, and the inner side of the support frame 301 is fixedly embedded with three base plates 307. A protective plate 309 is snap-connected on the inner side, three force measuring bodies 310 are embedded in the inner wall of the protective plate 309, a connecting bracket 308 is fixedly connected to the outer side of the support frame 301, a supporting seat 302 is hinged on the inner wall of the connecting bracket 308, a mounting rod 303 is fixedly embedded in the middle of the connecting bracket 308, alarm bodies 304 are installed on the tops of the three mounting rods 303, and the three alarm bodies 304 are electrically connected to the three force measuring bodies 310 respectively, wherein the specific model of the alarm is Honeywell SSCP-A1 Series, and the specific model of the force measuring body is HBM Z6FC3 Load Cell.

[0018] Optionally, the copper tailings-based inorganic mixed material is mixed with 50% to 60% copper tailings, 30% to 40% graded crushed stone, 6% to 8% inorganic cementitious material and 7% to 10% water. In the actual implementation process, the copper tailings-based inorganic mixed material is mixed with copper tailings, graded crushed stone, inorganic cementitious material and water, and the unconfined compressive strength is not less than 3MPa. The maximum dry density and optimum moisture content of the aggregate must be determined by a standard compaction test, and the proportion of the constituent materials copper tailings (50% to 60%), graded crushed stone (including crushed stone and stone chips 30% to 40%), inorganic cementitious material (6% to 8%), and water (7% to 10%) is determined to provide the proportion parameters of the relevant mixture for construction. In actual construction, the quality of raw materials and the proportion of materials, especially the amount and moisture content of inorganic cementitious materials, are strictly controlled, and they are mixed with a forced continuous mixer and transported to the construction site.

[0019] Optionally, the HDPE anti-seepage membrane is welded with a wedge welder, and the length of the seam is not less than 120 mm, and it is verified by air tightness detection and destructive test. Before laying, check the appearance of the anti-seepage membrane and repair the surface damage found; number each roll of material and lay it in sequence. During the laying process, the lap length of the seam between the membranes should be greater than 120 mm. The anti-seepage membrane should be anchored in the anchor groove according to the design requirements and fixed with backfill soil. The welding of the anti-seepage membrane generally adopts a wedge welder. The extrusion hot melt welder is used in places where the wedge welder cannot weld. When splicing, the horizontal seams should be welded first, and then the other seams. The anti-seepage membrane inspection is carried out in three steps, namely visual inspection, air tightness detection and destructive test.

[0020] Optionally, the compressive strength of the cement-stabilized material base layer 2 is not less than 4 MPa, the compaction coefficient is not less than 0.97, and the cement content is 4% to 6%. As the main load-bearing structural layer, it can not only effectively transfer the ground load, but also prevent the occurrence of surface water infiltration and groundwater rise, improve the water stability of the ground structure and enhance durability.

[0021] Optionally, a construction method of a slag slow cooling ground structure comprises the following steps: S1: measurement, positioning and laying out; S2: earth excavation and foundation pit cleaning; S3: Layered compaction and slope finding of replacement layer 7; S4: Layered laying and compaction of cushion layer 6 clay; S5: Laying and welding of HDPE anti-seepage membrane; S6: Smoothing the cement mortar of the protective layer 4; S7: compaction of cement stabilized material of base 2; S8: Surface layer 8 reinforcement binding and concrete pouring.

[0022] Optionally, the compaction coefficient of the replacement layer 7 is not less than 0.95, the unconfined compressive strength of the copper tailings-based inorganic hybrid material is not less than 3MPa, and layered paving and mechanical compaction are adopted during construction. In the actual implementation process, the copper tailings-based inorganic hybrid material is made of copper tailings, graded crushed stone, inorganic cementitious material and water, which are compacted into a whole shape, have good mechanical properties and plate properties, water stability and homogeneity, and are used to replace slag stone as a replacement material for collapsible silt layers or soft soil layers, which not only improves the overall strength of the structure below the cushion layer 6, but also effectively prevents the seepage and convergence of water, and improves the frost resistance, crack resistance and durability of the overall ground structure.

[0023] Optionally, the appearance integrity of the HDPE anti-seepage membrane needs to be checked before laying, and the welding order is horizontal seams first, then other seams, and quality acceptance is carried out through air tightness testing and visual inspection. In the actual implementation process, the appearance of the anti-seepage membrane is checked, surface damage found is repaired, each roll of material is numbered, and laid in sequence.

[0024] Optionally, the surface layer 8 is constructed by the skip-bin pouring method, the concrete is vibrated by mechanical vibration, the surface roughening depth is 0.6-0.8 mm, and the curing time is not less than 14 days. In the actual implementation process, the construction sequence of the steel surface layer 8 is: positioning and setting out → tying steel bars → side form support → concrete mixing → concrete transportation → concrete paving → concrete vibration → trowel slurry troweling → concrete roughening → concrete curing → sawing and filling → finished product protection.

[0025] For large areas of concrete, zoning control and compartment pouring should be carried out according to the site area and design drawings. Positioning and laying out should be combined with the expansion joint and construction joint setting. The focus is on controlling the position and elevation of the side formwork. Mark the placement of the steel bars on the base 2, lay the lower steel mesh, and use steel stirrups to pad the upper steel mesh, so as to meet the requirements of strictly controlling the side form elevation and the steel protection layer 4.

[0026] The concrete paving adopts the skip-bin pouring method, and the concrete adopts commercial concrete. The slump should be strictly controlled at 160mm when entering the site. It is transported to the site by a concrete tanker, pumped into the mold by a concrete pump, and paved manually to the designed thickness + virtual paving height (virtual paving height is 2-3cm). The concrete should be paved continuously without interruption. During the concrete pouring process, the concrete should be vibrated to ensure the compactness of the concrete. The vibration time, moving distance and insertion depth should be strictly controlled to prevent vibration leakage and over-vibration.

[0027] After the concrete is leveled and vibrated, it is left to stand for about 2 hours to make the concrete in the critical initial setting period. Use a trowel to roughly apply one or two times on the concrete surface to raise the slurry, rub the hair and compact it. According to the design requirements, when the concrete slab surface needs to be roughened, a wire brush or a row brush can be used to make the slab surface have obvious horizontal textures with a depth of about 0.6-0.8mm. After the construction of the surface layer 8 is completed, it should be sprayed and maintained in time, covered with a film or straw bag, and the surface should be kept moist. When the concrete strength reaches more than 80% of the design requirements, the maintenance is stopped, generally not less than 14 days. When the concrete strength reaches C10 level, the slit can be cut, the slit width is 2-3mm, and the slit spacing is generally 6X6 meters. The filler in the construction joint should be an elastic asphalt mixture, and petroleum asphalt, sawdust, and asbestos can be used, with a weight ratio of 8:1:1.

[0028] Working principle: The top layer of the ground structure 1 is 350mm thick C35 grade cast-in-place concrete, equipped with a double-layer bidirectional Φ16@250 steel mesh. This surface layer 8 has high compressive strength and crack resistance, and can withstand the weight of slag stacking and mechanical equipment during the slow cooling field production process. At the same time, it prevents surface cracking under temperature changes or external force impacts. Below the surface layer 8 is a 300mm thick 6% cement stabilized material base 2 with a compressive strength of not less than 4MPa, which further enhances the bearing capacity of the overall structure. After compaction, the cement base 2 ensures a high density, allowing the structure to stably resist moisture. The softening effect of collapsible soil. In addition, the 20mm thick cement mortar layer under the base layer 2 not only plays a leveling role, but also protects the HDPE anti-seepage membrane to prevent water seepage. In order to effectively prevent water penetration, the structure is designed with a waterproof layer 5, including a 400g / m² non-woven geotextile and a 2mm thick HDPE anti-seepage membrane. These two layers of materials are used together to form a solid barrier to prevent surface water or slag bag spray water from penetrating to deeper levels. In addition, the seams of the HDPE anti-seepage membrane are welded by a wedge welding machine to ensure its sealing, and have been tested for air tightness to ensure the reliability of the seams. In terms of waterproof design, 30 The 0mm thick clay water stop layer is an important part of the structure. The low permeability of the clay material is used to prevent water from penetrating downward to the replacement layer 7. The replacement layer 7 uses a copper tailings-based inorganic mixed material, which is a mixture of copper tailings, graded crushed stone, inorganic cementitious material and water. The replacement thickness is not less than 800mm, the compaction coefficient is not less than 0.95, and the unconfined compressive strength is not less than 3MPa. Through this design, the collapsible silt layer or soft soil layer is replaced, ensuring that the foundation will not deform or settle due to collapsing during long-term use. The design of the support mechanism 3 further improves the safety and monitoring capabilities of the structure. The support mechanism 3 composed of components such as a support frame 301, a force gauge and an alarm can monitor the stress condition of the ground structure in real time, and promptly feedback any abnormal pressure or deformation to prevent the ground from cracking or collapsing. When the force gauge detects changes in the ground structure body 1, it can sound an alarm when an abnormality is found, reminding maintenance personnel to take corresponding measures. Overall, through the combination of multi-layer materials and careful anti-seepage and pressure-bearing design, a series of problems such as ground water accumulation, infiltration, structural cracking and groundwater pollution are solved, ensuring the long-term stable operation of the site, meeting the needs of industrial production, and reducing the impact on the environment.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0030] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A slow cooling ground structure, comprising a ground structure body (1), characterized in that: The ground structure body (1) comprises: Surface layer (8): 350 mm thick C35 grade cast-in-place concrete with double-layer bidirectional Φ16@250 steel mesh; Base layer (2): 300 mm thick 6% cement stabilized material with a compressive strength of not less than 4 MPa; Protective layer (4): 20 mm thick cement mortar to protect the HDPE anti-seepage membrane; Waterproof layer (5): 400g / m² non-woven geotextile and 2mm thick HDPE anti-seepage membrane; Cushion (6): 300 mm thick clay waterproof layer to prevent water penetration; Replacement layer (7): Copper tailings-based inorganic mixed material, used to replace collapsible silt layer or soft soil layer, with a replacement thickness of not less than 800 mm, a compaction coefficient of not less than 0.95, and an unconfined compressive strength of not less than 3 MPa; A support mechanism (3) is provided on the outside of the ground structure body (1), and the support mechanism (3) comprises a support frame (301), a support seat (302), a mounting rod (303), an alarm body (304), an outer reinforcement plate (305), an inner reinforcement plate (306), a base plate (307), a connecting bracket (308), a protective plate (309) and a force measuring device body (310), wherein the outer side of the support frame (301) is fixedly connected to the outer reinforcement plate (305), the inner side of the support frame (301) is fixedly connected to the inner reinforcement plate (306), and the inner side of the support frame (301) is fixedly embedded with three base plates. The support frame (301) is provided with a protective plate (309) which is snap-connected to the inner side of the support frame (301); three force measuring bodies (310) are embedded in the inner wall of the protective plate (309); a connecting bracket (308) is fixedly connected to the outer side of the support frame (301); a support seat (302) is hingedly connected to the inner wall of the connecting bracket (308); a mounting rod (303) is fixedly embedded in the middle of the connecting bracket (308); an alarm body (304) is installed on the top of each of the three mounting rods (303); and the three alarm bodies (304) are electrically connected to the three force measuring bodies (310) respectively.

2. The slow cooling ground structure and construction method thereof according to claim 1 are characterized in that: The copper tailings-based inorganic mixed material is prepared by mixing 50%-60% of copper tailings, 30%-40% of graded crushed stone, 6%-8% of inorganic gelling material and 7%-10% of water.

3. The slow cooling ground structure and construction method thereof according to claim 1 are characterized in that: The HDPE anti-seepage membrane is welded by a wedge welding machine, the seam length is not less than 120 mm, and is verified by air tightness testing and destructive testing.

4. The slow cooling ground structure and construction method thereof according to claim 1 are characterized in that: The compressive strength of the cement-stabilized material base (2) is not less than 4 MPa, the compaction coefficient is not less than 0.97, and the cement content is 4%-6%.

5. A construction method for a slag slow cooling ground structure, characterized in that: The following steps are involved: S1: measurement, positioning and laying out; S2: earth excavation and foundation pit cleaning; S3: Layered compaction and slope finding of the replacement layer (7); S4: Layering and compaction of cushion layer (6) clay; S5: Laying and welding of HDPE anti-seepage membrane; S6: Smoothing the cement mortar of the protective layer (4); S7: compaction of cement stabilization material of base layer (2); S8: Surface layer (8) reinforcement binding and concrete pouring.

6. The construction method of the slow cooling ground structure according to claim 5 is characterized by: The replacement layer (7) has a compaction coefficient of not less than 0.95, and the unconfined compressive strength of the copper tailings-based inorganic mixed material is not less than 3 MPa. During construction, layered paving and mechanical compaction are adopted.

7. The construction method of the slow cooling ground structure according to claim 5 is characterized by: The appearance integrity of the HDPE anti-seepage membrane needs to be checked before laying. The welding sequence is horizontal seams first, then other seams, and quality acceptance is carried out through air tightness testing and visual inspection.

8. The construction method of the slow cooling ground structure according to claim 5 is characterized by: The surface layer (8) is constructed by a skip-bin pouring method, the concrete is vibrated by a mechanical vibrator, the surface roughening depth is 0.6-0.8 mm, and the curing time is not less than 14 days.

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