Dry-method tamping pier construction method for high-humidity soil low-carbon reinforcement

Abstract

The invention provides a dry-method tamping pier construction method for high-humidity soil low-carbon reinforcement, and belongs to the technical field of foundation low-carbon rapid reinforcement. The dry-method tamping pier construction method comprises the steps that holes are dug in high-water-content plastic soil foundation reinforcement, then, dug high-humidity soil is evenly mixed with tunnel hole residues and a low-carbon curing agent according to a certain mixing proportion on site through a movable powerful stirrer, and the high-moisture-content plastic soil foundation is formed; and the mixture is rammed and filled back to the pier hole by a layered dry method, and finally, the rammed pier is formed through maintenance. In the low-carbon curing agent, solid waste materials such as the carbide slag, the alunite powder and the mineral powder are used for replacing part of cement, generation of harmful substances such as calcium hydroxide is reduced through mutual reaction among the materials, the mode of improving excavated soil is used for replacing borrowing earthwork backfilling, and the problem of shortage of soil and stone resources is solved; meanwhile, traditional wet stirring is replaced with a dry construction mode, the pier body strength and construction efficiency are improved, the overall bearing capacity and durability of a foundation are guaranteed, and the method has the advantages of being wide in application range, easy and convenient to construct, high in early strength, good in durability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of low-carbon rapid reinforcement of foundations, and in particular to a dry compaction pier construction method for low-carbon reinforcement of high-humidity soil. Background Art

[0002] The soil in large plateau areas has a high moisture content and is soft after frost heaving. It has the characteristics of large porosity, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, large disturbance, and large differences in physical and mechanical properties between layers. If it is directly applied, it will cause large settlement, deformation and collapse. Therefore, how to improve such foundations has become a problem that needs to be solved urgently. Fortunately, some industrial solid wastes contain extremely rich elements such as magnesium, silicon, aluminum, and calcium, which can be used to prepare regenerated negative carbon gel materials. Reasonable use in improving soil and building materials can achieve the purpose of environmental protection and green regeneration.

[0003] At present, in terms of composite foundation treatment, commonly used methods include cement mixing piles, cement fly ash gravel piles (CFG piles) and other methods. These methods are mainly based on wet operations, with good technical performance and economic effects, but the large amount of cement used will continue to cause damage to the environment; the treatment of cement residue on the top of the pile is time-consuming and labor-intensive; and the construction requires real-time cooperation with water trucks, which affects the construction efficiency. Application No. CN202410461378.5 discloses a cement soil mixing construction method for improving the uniformity of the pile body. This method can effectively increase the uniformity of the pile body and improve the strength of the pile body after two drillings and three mixing and lifting by the drill bit, so as to reinforce the poor soil of the deep foundation pit. However, this method may have problems such as insufficient density of the pile body, slow growth of the pile body strength, large workload of surface leveling after construction, and pollution of the surrounding environment. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a dry compaction pier construction method for low-carbon reinforcement of high-humidity soil, in which solid waste materials such as carbide slag, alum stone powder, mineral powder, etc. are used to replace part of the cement in the low-carbon curing agent, and the generation of harmful substances such as calcium hydroxide is reduced through the mutual reaction between the materials. The problem of shortage of soil and stone resources is solved by improving the excavated soil body instead of borrowing earth for backfilling. At the same time, the dry construction method replaces the traditional wet mixing method, which improves the pier body strength and construction efficiency, ensures the overall bearing capacity and durability of the foundation, and has the characteristics of wide application, simple construction, high early strength and good durability.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A dry compaction pier construction method for low-carbon reinforcement of high-humidity soil, comprising the following steps:

[0007] Determine the location of the construction foundation, and perform surface clearing and leveling on the construction foundation;

[0008] Carry out pier location selection and layout at the treated construction foundation to determine the pier location;

[0009] Controlling the rotary drilling bit to excavate and move soil at the pier position until the excavation depth reaches the construction requirement, a pier hole is obtained and high-humidity soil is obtained;

[0010] By detecting the natural moisture content and bulk density of the soil at the pier position, the proportion of tunnel slag and low-carbon curing agent to be added to the high-humidity soil is determined;

[0011] Controlling a mobile powerful mixer to shovel in the high-humidity soil, and adding the tunnel slag and the low-carbon curing agent to the high-humidity soil in batches according to the determined ratio, stirring and mixing evenly to obtain a mixed soil material;

[0012] According to the construction requirements of the loose thickness of the backfill soil, the mixed soil material is backfilled into the pier hole in layers, and a rammer is used to compact the mixed soil material in the pier hole during each layered backfilling process, and finally a compacted pier is formed after maintenance.

[0013] Preferably, the high-humidity soil is foundation soil with a high soil moisture content, excluding soft soil with a soil moisture content exceeding the liquid limit.

[0014] Preferably, the tunnel slag is the residue after tunnel excavation, and the maximum particle size of the tunnel slag is not greater than one tenth of the pier diameter.

[0015] Preferably, the amount of the tunnel slag added to the high-humidity soil is 15-45wt.%;

[0016] If the natural moisture content of the soil is 15-20%, the amount of the tunnel slag added to the high-humidity soil is 15-20wt.%; if the natural moisture content of the soil is 20-25%, the amount of the tunnel slag added to the high-humidity soil is 20-30wt.%; if the natural moisture content of the soil is 25-30%, the amount of the tunnel slag added to the high-humidity soil is 30-35wt.%; if the natural moisture content of the soil is 30-35%, the amount of the tunnel slag added to the high-humidity soil is 35-45wt.%.

[0017] Preferably, the blending ratio of the low carbon curing agent is 8-20wt.% of the mass of the high-wet soil.

[0018] Preferably, the low-carbon curing agent is a powder formed by mixing cement, carbide slag, mineral powder, alum stone powder and desulfurized gypsum, and the mass ratio of the cement, carbide slag, mineral powder, alum stone powder and desulfurized gypsum is 35-45wt.%: 20-30wt.%: 5-14wt.%: 20-30wt.%: 0.7-1wt.%.

[0019] Preferably, the carbide slag is a substance rich in CaO and Ca(OH)2 components, including but not limited to carbide slag, quicklime and slaked lime; the alunite powder is a substance rich in aluminum sulfate components, including but not limited to alunite powder and aluminum sulfate, a by-product of smelting.

[0020] Preferably, a mobile high-power mixer is controlled to shovel the high-humidity soil, and the tunnel slag and low-carbon curing agent are added to the high-humidity soil in batches according to the determined ratio, and the mixture is stirred and mixed to obtain a mixed soil material, comprising: the mobile high-power mixer is realized by installing a bucket with a stirring function on a loader, and the volume of the bucket is 2 to 5 m 3 After the high-moisture soil is shoveled into the bucket, the tunnel slag is first added to the high-moisture soil according to the determined proportion, and after stirring and mixing evenly, the low-carbon curing agent is added according to the determined proportion, and the second stirring and mixing is performed to obtain a mixed soil material, and the stirring and mixing time is not less than 2 minutes.

[0021] Preferably, according to the construction requirements of the loose thickness of the backfill soil, the mixed soil material is backfilled into the pier hole in layers, and a rammer is used to compact the mixed soil material in the pier hole during each layered backfilling process, and finally a compacted pier is formed after maintenance, including: backfilling the mixed soil material in layers according to the requirement of a loose thickness of 70 to 90 cm for the backfill soil, and the last backfilling of the pier top is carried out until the loose soil is freely diffused throughout the entire pier diameter.

[0022] Preferably, a rammer is used to compact the mixed soil in the pier hole during each layered backfilling process, and the number of tamping times after backfilling each layer of mixed soil is 6 to 15 times. The sinking height of the rammer at the last tamping of the pier top does not exceed 5 mm.

[0023] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0024] (1) The present invention provides a dry compaction pier construction method for low-carbon reinforcement of high-humidity soil. The complex foundation treatment can be carried out by the provided construction method, which can effectively reduce the amount of cement used, promote the resource utilization of solid waste, and significantly increase the construction efficiency of foundation treatment, which has good engineering application prospects. At the same time, the construction is carried out in a dry compaction manner, which is easy to operate, has a short pier body forming time, a high pier body density, and little impact on the surrounding environment. In addition, the surrounding working surface can be treated during construction.

[0025] (2) The present invention adds tunnel slag to high-humidity soil to improve the excavated soil. On the one hand, due to the high hardness and other characteristics of tunnel slag, the skeleton structure of the pier body can be improved and the water content of the soil can be reduced, thereby saving the amount of gel material. On the other hand, the problem of tunnel slag disposal and utilization is solved, and the problem of land occupation and high-cost transportation of engineering waste is solved. In addition, the present invention can quickly increase the early strength of the pier body and improve the overall durability by preparing a low-carbon curing agent and through the mutual coordination of various components therein. Among them, the alum stone powder is rich in a large amount of aluminum oxide and sulfate components, which can neutralize the calcium hydroxide produced by cement and other gelling materials to generate harmless environmentally friendly substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The present invention is a flow chart of a dry compaction pier construction method for low-carbon reinforcement of high-humidity soil. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The purpose of the present invention is to provide a dry compaction pier construction method for low-carbon reinforcement of high-humidity soil, in which solid waste materials such as carbide slag, alum stone powder, mineral powder, etc. are used to replace part of the cement in the low-carbon curing agent, and the generation of harmful substances such as calcium hydroxide is reduced through the mutual reaction between the materials. The problem of shortage of soil and stone resources is solved by replacing the backfilling of borrowed earth with improved excavation of soil. At the same time, the dry construction method replaces the traditional wet mixing method, which improves the pier body strength and construction efficiency, ensures the overall bearing capacity and durability of the foundation, and has the characteristics of wide application, simple construction, high early strength and good durability.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, the present invention provides a dry compaction pier construction method for low-carbon reinforcement of high-humidity soil, comprising the following steps:

[0032] Step 100: Determine the location of the construction foundation, and perform surface clearing and leveling on the construction foundation;

[0033] Step 200: Selecting points and laying out lines at the processed construction foundation to determine the pier positions;

[0034] Step 300: Control the rotary drilling bit to excavate and move soil at the pier position until the excavation depth reaches the construction requirement, a pier hole is obtained and high-humidity soil is obtained;

[0035] Step 400: determining the ratio of tunnel slag and low-carbon curing agent to be added to the high-humidity soil by detecting the natural moisture content and bulk density of the soil at the pier position;

[0036] Step 500: Controlling a mobile high-power mixer to shovel in the high-humidity soil, and adding the tunnel slag and low-carbon curing agent to the high-humidity soil in batches according to the determined ratio, stirring and mixing to obtain a mixed soil material;

[0037] Step 600: according to the construction requirements of the loose thickness of the backfill soil, the mixed soil material is backfilled into the pier hole in layers, and a rammer is used to compact the mixed soil material in the pier hole during each layered backfilling process, and finally a compacted pier is formed through maintenance.

[0038] First, in the above content, the high-humidity soil is foundation soil with high soil moisture content, excluding soft soil with soil moisture content exceeding the liquid limit. The tunnel slag is the residue after tunnel excavation, and the maximum particle size of the tunnel slag is not greater than one tenth of the pier diameter. In addition, the amount of the tunnel slag added to the high-humidity soil is 15-45wt.%; if the natural moisture content of the soil is 15-20%, the amount of the tunnel slag added to the high-humidity soil is 15-20wt.%; if the natural moisture content of the soil is 20-25%, the amount of the tunnel slag added to the high-humidity soil is 20-30wt.%; if the natural moisture content of the soil is 25-30%, the amount of the tunnel slag added to the high-humidity soil is 30-35wt.%; if the natural moisture content of the soil is 30-35%, the amount of the tunnel slag added to the high-humidity soil is 35-45wt.%.

[0039] Secondly, in the above content, the mixing ratio of the low carbon curing agent is 8-20wt.% of the mass of the high-humidity soil. The low carbon curing agent is a powder formed by mixing cement, carbide slag, mineral powder, alum stone powder and desulfurized gypsum, and the mass ratio of the cement, carbide slag, mineral powder, alum stone powder and desulfurized gypsum is 35-45wt.%: 20-30wt.%: 5-14wt.%: 20-30wt.%: 0.7-1wt.%. The carbide slag is a related substance rich in CaO and Ca(OH)2 components, including but not limited to carbide slag, quicklime and slaked lime; the alum stone powder is a related substance rich in aluminum sulfate components, including but not limited to alum stone powder and aluminum sulfate, a by-product of smelting.

[0040] Again, in the above content, the mobile high-power mixer is controlled to shovel the high-humidity soil, and the tunnel slag and low-carbon curing agent are added to the high-humidity soil in batches according to the determined ratio, and the mixed soil is mixed evenly to obtain the mixed soil material, including: the mobile high-power mixer is realized by installing a bucket with a mixing function on a loader, and the volume of the bucket is 2 to 5 m 3 After the high-moisture soil is shoveled into the bucket, the tunnel slag is first added to the high-moisture soil according to the determined proportion, and after stirring and mixing evenly, the low-carbon curing agent is added according to the determined proportion, and the second stirring and mixing is performed to obtain a mixed soil material, and the stirring and mixing time is not less than 2 minutes.

[0041] Finally, in the above content, according to the construction requirements of the loose thickness of the backfill soil, the mixed soil material is backfilled into the pier hole in layers, and a rammer is used to compact the mixed soil material in the pier hole during each layered backfilling process, and finally a compacted pier is formed after maintenance, including: the mixed soil material is backfilled in layers according to the requirement that the loose thickness of the backfill soil body is 70 to 90 cm, and the last backfilling of the pier top is until the loose soil body freely diffuses into the entire pier diameter. In addition, a rammer is used to compact the mixed soil material in the pier hole during each layered backfilling process, and the number of tamping times after each layer of mixed soil material is backfilled is 6 to 15, and the sinking height of the rammer does not exceed 5 mm after the last tamping of the pier top.

[0042] Embodiment 1

[0043] In this embodiment, the specific construction method includes:

[0044] (1) Clear and level the foundation to be treated;

[0045] (2) The construction design pier diameter is 1.3m, and the horizontal and vertical pier center distances are both 1.8m. The pier location is selected and laid out;

[0046] (3) Control the rotary drilling bit to dig and move soil at the predetermined pier position, digging to 20 cm of the foundation bearing layer, and the hole depth is about 2.1 m;

[0047] (4) The natural moisture content of the excavated body is 18%, and the bulk density is 1.15 g / cm 3 ;

[0048] (5) The bucket volume of the mobile high-power mixer used is about 2m 3 The mass of high-humidity soil shoveled in at one time is about 2.3t, and 15% by mass of tunnel slag is added, and the particle size of the tunnel slag is less than 100mm, and mixed and stirred for 3 minutes;

[0049] (6) preparing a low carbon curing agent by mixing in advance 40 wt.% of cement, 20 wt.% of carbide slag, 14 wt.% of mineral powder, 25 wt.% of alum stone powder and 1 wt.% of desulfurized gypsum;

[0050] (7) Add 10% of the mass of high-wet soil into the bucket and continue stirring for 3 minutes;

[0051] (8) Pour the mixed soil material into the pier hole and compact it;

[0052] (9) The loose thickness of the first backfill soil was 76 cm, the number of tamping times was 9, and the compacted thickness was 58 cm; the loose thickness of the second backfill was 84 cm, the number of tamping times was 10, and the compacted thickness was 61 cm; the loose thickness of the third backfill was 72 cm, the number of tamping times was 10, and the compacted thickness was 54 cm. The last backfill was until the pier hole was filled and the central soil was freely diffused to the edge of the pier hole. The number of tamping times was 8, the compacted thickness was 34 cm, and the final pier length was 207 cm;

[0053] (10) Clean the excess soil on the top and around the pier to finally form the pier.

[0054] Seven days after the pier was formed, core sampling and single pier static load tests were carried out. The results showed that the compressive strength of the pier material reached 1.85MPa, the saturated strength after immersion in water was 1.06MPa, and the bearing capacity of a single pier was 195kPa.

[0055] Embodiment 2

[0056] In this embodiment, the specific construction method includes:

[0057] (1) Clear and level the foundation to be treated;

[0058] (2) The construction design pier diameter is 1.2m, and the horizontal and vertical pier center distances are both 1.8m. The pier location is selected and laid out;

[0059] (3) Control the rotary drilling bit to dig and move soil at the predetermined pier position, digging to 20 cm of the foundation bearing layer, and the hole depth is about 1.9 m;

[0060] (4) The natural moisture content of the excavated body is 16%, and the bulk density is 1.15 g / cm 3 ;

[0061] (5) The bucket volume of the mobile high-power mixer used is about 2m 3 The mass of high-humidity soil shoveled in at one time is about 2.3t, and 10% by mass of tunnel slag is added, the particle size of the tunnel slag is less than 100mm, and mixed and stirred for 3 minutes;

[0062] (6) preparing a low carbon curing agent by mixing in advance 35 wt.% of cement, 30 wt.% of carbide slag, 14 wt.% of mineral powder, 20 wt.% of alum stone powder and 1 wt.% of desulfurized gypsum;

[0063] (7) Add 15% of the mass of high-wet soil into the bucket and continue stirring for 4 minutes;

[0064] (8) Pour the mixed soil material into the pier hole and compact it;

[0065] (9) The loose thickness of the first backfill soil was 82 cm, the number of tamping times was 12, and the compacted thickness was 63 cm; the loose thickness of the second backfill soil was 78 cm, the number of tamping times was 10, and the compacted thickness was 59 cm; the loose thickness of the third backfill soil was 89 cm, the number of tamping times was 12, and the compacted thickness was 67 cm. The final pier length was 189 cm;

[0066] (10) Clean the excess soil on the top and around the pier to finally form the pier.

[0067] Seven days after the pier was formed, core sampling and single pier static load tests were carried out. The results showed that the compressive strength of the pier material reached 2.01MPa, the saturated strength after immersion in water was 1.17MPa, and the bearing capacity of a single pier was 230kPa.

[0068] Embodiment 3

[0069] In this embodiment, the specific construction method includes:

[0070] (1) Clear and level the foundation to be treated;

[0071] (2) The construction design pier diameter is 1.3m, the horizontal pier center distance is 2.4m, and the longitudinal pier center distance is 1.8m. The pier location is selected and laid out;

[0072] (3) Control the rotary drilling bit to excavate and move soil at the predetermined pier position, excavate to 20 cm of the foundation bearing layer, and the hole depth is about 2.2 m;

[0073] (4) The natural moisture content of the excavated body is 26%, which is consistent with the bulk density of 1.21 g / cm 3 ;

[0074] (5) The bucket volume of the mobile high-power mixer used is about 3m 3 The mass of high-humidity soil shoveled in at one time is about 3.6t, and 30% of the mass of tunnel slag is added. The particle size of the tunnel slag is less than 100mm, and the mixture is stirred for 4 minutes;

[0075] (6) preparing a low carbon curing agent by mixing in advance 40 wt.% of cement, 30 wt.% of carbide slag, 15 wt.% of mineral powder and 15 wt.% of alum stone powder, or preparing a low carbon curing agent by mixing in advance 45 wt.% of cement, 25 wt.% of carbide slag, 9 wt.% of mineral powder, 20 wt.% of alum stone powder and 1 wt.% of desulfurized gypsum;

[0076] (7) Add 18% low carbon curing agent by mass of high wet soil into the bucket and continue stirring for 4 minutes;

[0077] (8) Pour the mixed soil material into the pier hole and compact it;

[0078] (9) The loose thickness of the first backfill soil was 78 cm, the number of tamping times was 10, and the compacted thickness was 60 cm; the loose thickness of the second backfill was 85 cm, the number of tamping times was 13, and the compacted thickness was 65 cm; the loose thickness of the third backfill was 79 cm, the number of tamping times was 11, and the compacted thickness was 62 cm. The last backfill was until the pier hole was filled and the central soil was freely diffused to the edge of the pier hole. The number of tamping times was 9, and the compacted thickness was 29 cm. The final pier length was 216 cm;

[0079] (10) Clean the excess soil on the top and around the pier to finally form the pier.

[0080] 7 days after the pier was formed, core sampling and single pier static load tests were carried out. The results showed that the compressive strength of the pier material reached 2.2MPa, the saturated strength after immersion in water was 1.3MPa, and the bearing capacity of a single pier was 233kPa.

[0081] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0082] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A dry compaction pier construction method for low-carbon reinforcement of high-humidity soil, characterized in that: The following steps are involved: Determine the location of the construction foundation, and perform surface clearing and leveling on the construction foundation; Carry out pier location selection and layout at the treated construction foundation to determine the pier location; Controlling the rotary drilling bit to excavate and move soil at the pier position until the excavation depth reaches the construction requirement, a pier hole is obtained and high-humidity soil is obtained; By detecting the natural moisture content and bulk density of the soil at the pier position, the proportion of tunnel slag and low-carbon curing agent to be added to the high-humidity soil is determined; Controlling a mobile high-power mixer to shovel in the high-humidity soil, and adding the tunnel slag and low-carbon curing agent to the high-humidity soil in batches according to the determined ratio, stirring and mixing evenly to obtain a mixed soil material; According to the construction requirements of the loose thickness of the backfill soil, the mixed soil material is backfilled into the pier hole in layers, and a rammer is used to compact the mixed soil material in the pier hole during each layered backfilling process, and finally a compacted pier is formed after maintenance.

2. A dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 1, characterized in that: The high-humidity soil is foundation soil with high soil moisture content, and does not include soft soil with soil moisture content exceeding the liquid limit.

3. The dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 1 is characterized in that: The tunnel slag is the residue left after tunnel excavation, and the maximum particle size of the tunnel slag is no more than one tenth of the pier diameter.

4. A dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 3, characterized in that: The amount of the tunnel slag added to the high-humidity soil is 15-45wt.%; If the natural moisture content of the soil is 15-20%, the amount of the tunnel slag added to the high-humidity soil is 15-20wt.%; if the natural moisture content of the soil is 20-25%, the amount of the tunnel slag added to the high-humidity soil is 20-30wt.%; if the natural moisture content of the soil is 25-30%, the amount of the tunnel slag added to the high-humidity soil is 30-35wt.%; if the natural moisture content of the soil is 30-35%, the amount of the tunnel slag added to the high-humidity soil is 35-45wt.%.

5. The dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 1 is characterized in that: The low carbon curing agent is added in an amount of 8-20 wt. % of the mass of the high-wet soil.

6. A dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 5, characterized in that: The low-carbon curing agent is a powder formed by mixing cement, carbide slag, mineral powder, alum stone powder and desulfurized gypsum, and the mass ratio of the cement, carbide slag, mineral powder, alum stone powder and desulfurized gypsum is 35-45wt.%: 20-30wt.%: 5-14wt.%: 20-30wt.%: 0.7-1wt.%.

7. A dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 6, characterized in that: The carbide slag is a substance rich in CaO and Ca(OH)2 components, including but not limited to carbide slag, quicklime and slaked lime; the alunite powder is a substance rich in aluminum sulfate components, including but not limited to alunite powder and aluminum sulfate, a by-product of smelting.

8. The dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 1 is characterized in that: Controlling a mobile powerful mixer to shovel in the high-humidity soil, and adding the tunnel slag and low-carbon curing agent to the high-humidity soil in batches according to the determined ratio, stirring and mixing evenly to obtain a mixed soil material, comprising: the mobile powerful mixer is realized by installing a bucket with a stirring function on a loader, and the volume of the bucket is 2 to 5 m 3 After the high-moisture soil is shoveled into the bucket, the tunnel slag is first added to the high-moisture soil according to the determined proportion, and after stirring and mixing evenly, the low-carbon curing agent is added according to the determined proportion, and the second stirring and mixing is performed to obtain a mixed soil material, and the stirring and mixing time is not less than 2 minutes.

9. The dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 1 is characterized in that: According to the construction requirements of the loose thickness of the backfill soil, the mixed soil material is backfilled into the pier hole in layers, and a rammer is used to compact the mixed soil material in the pier hole during each layered backfilling process, and finally a compacted pier is formed after maintenance, including: backfilling the mixed soil material in layers according to the requirement of a loose thickness of 70 to 90 cm for the backfill soil, and the last backfilling of the pier top is carried out until the loose soil is freely diffused throughout the entire pier diameter.

10. A dry compaction pier construction method for low-carbon reinforcement of high-humidity soil according to claim 9, characterized in that: During each layered backfilling process, a rammer is used to compact the mixed soil in the pier hole. The number of tamping times after each layer of mixed soil is backfilled is 6 to 15. The sinking height of the rammer at the last tamping of the pier top does not exceed 5 mm.

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