Fluidized solidified soil pile cap structure and manufacturing method

Abstract

This invention provides a fluidized solidified soil foundation structure, comprising, from top to bottom: a foundation, including, from top to bottom, an upper reinforcing layer, a middle truss structure, a lower reinforcing layer, and a fluidized solidified soil filler within the foundation; EPS geofoam filling the space between the middle truss structure and the removable formwork; a cement mixing pile group; and a bearing layer. This invention also provides a method for manufacturing the fluidized solidified soil foundation structure. By setting the foundation and cement mixing pile group on the bearing layer, and using EPS geofoam and removable formwork for fluidized solidified soil pouring and filling, this invention effectively solves the problem that existing soft soil subgrade reinforcement technologies are unsuitable for construction in high-moisture-content soft strata. It improves bearing capacity and stability, eliminates the need for continuous maintenance, avoids the need to treat high-moisture-content silt layers, reduces costs, and accelerates the construction cycle.

Description

Technical Field

[0001] This invention belongs to the field of foundation treatment technology, specifically relating to a flow-solidified soil foundation structure and its manufacturing method. Background Technology

[0002] In the field of foundation treatment, construction under soft soil conditions such as high water content silt and silty soil is a common problem. Soft soil has poor engineering characteristics such as strong fluidity, high compressibility and low bearing capacity. When construction equipment and machinery enter the site, they are prone to tilting, mud sinking and other situations, which can cause serious safety accidents.

[0003] Currently, the main methods for treating soft soil strata are gradual shallow solidification to form a shallow solidified layer with a certain load-bearing capacity, or laying steel plates under machinery to improve load-bearing capacity. Gradual solidification is expensive, has a long construction period, and only involves work in the treated area. Furthermore, effectively improving load-bearing capacity often requires large amounts of solidifying agent, and laying steel plates is difficult; improper operation can easily lead to accidents, resulting in vehicle damage and fatalities. Both methods are prone to uneven settlement and significant soil deformation, resulting in limited improvement in load-bearing capacity, the need for continuous maintenance, and poor stability. Conventional solidification methods are particularly unsuitable for construction in soft soil strata with high water content.

[0004] Chinese invention patent application number CN202210034963.8 discloses a pile-supported soft soil subgrade reinforcement structure and method. This method improves the interfacial friction between the reinforcement and soil, controls uneven settlement, and effectively prevents lateral deformation by using shallow inter-pile soil solidification, cement-mixed pile groups as the pile support structure, three-dimensional geocells instead of two-dimensional geogrids, and silt-solidified soil as the reinforcing cushion layer filling material and subgrade filler. However, when this reinforcement structure and method are applied to construction in high-moisture-content soft soil strata, the poor performance of the solidified silt results in poor bearing capacity of the top embankment layer and the silt-solidified cushion layer, making direct on-site use difficult. Furthermore, dewatering treatment is required before silt solidification to achieve the required moisture content for mixing and spreading. Dewatering operations in high-moisture-content soft soil strata are time-consuming, labor-intensive, and material-intensive. The large amount of solidified silt used in the top embankment layer and the silt-solidified cushion layer significantly limits the project progress.

[0005] Therefore, there is an urgent need for a roadbed support structure and manufacturing method that is applicable to soft strata with high water content, has strong bearing capacity and stability, and is convenient for construction and subsequent maintenance. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a fluidized solidified soil foundation structure and its manufacturing method. This invention aims to solve the problems of existing technologies, such as the gradual solidification method and the steel plate laying method, which are prone to uneven settlement and large soil deformation, have limited improvement in bearing capacity, require continuous maintenance and construction, and have poor stability. The gradual solidification method is also expensive, has a long construction period, requires a large amount of curing agent, and the steel plate laying method is difficult to operate. All of these methods are not suitable for construction in soft soil strata with high water content.

[0007] To address the aforementioned technical problems, this invention provides a fluidized solidified soil foundation structure, comprising, from top to bottom, the following:

[0008] The foundation includes, from top to bottom, an upper reinforcement layer, a middle truss structure, a lower reinforcement layer, and a fluidized solidified soil casting body filled within the foundation. Both the upper and lower reinforcement layers include a longitudinally connected three-dimensional geocell reinforcement pad and a geogrid reinforcement pad. The middle truss structure is surrounded by a detachable template, and EPS geofoam is filled between the middle truss structure and the detachable template. A surface layer is provided on top of the upper reinforcement layer.

[0009] A cement mixing pile group, wherein the cement mixing pile group is formed by mixing cement with a soil stabilizer and solidifying it;

[0010] Bearing layer;

[0011] The upper end of the cement mixing pile group passes through the silt layer between the foundation and the bearing layer and connects to the bottom of the foundation, while the lower end of the cement mixing pile group extends into the bearing layer.

[0012] Furthermore, the three-dimensional geocell reinforced cushion layer is formed by filling three-dimensional geocells with fluidized solidified soil, and the geogrid reinforced cushion layer is formed by filling geogrids with fluidized solidified soil.

[0013] Furthermore, the fluidized solidified soil is a mixture of cement-based materials and silt, wherein the silt has a water content of 80-110% and the cement-based material content is 20-30%.

[0014] Furthermore, the slump of the fluidized solidified soil is 180-200 mm, and the 28-day strength of the fluidized solidified soil is not less than 3 MPa.

[0015] Furthermore, the soil stabilizer comprises, by mass fraction, 65%–80% of 42.5 grade silicate cement, 5–15% of blast furnace slag ash, 5–15% of fly ash, and 5–10% of silica fume, and the dosage of the soil stabilizer is 20–30 wt%.

[0016] Furthermore, the cement mixing pile group includes multiple cement mixing piles with variable cross-sections and pile caps disposed on the top of the cement mixing piles. The pile caps are located within the silt layer, and the top of the pile caps is located at the bottom of the lower reinforcement layer.

[0017] Furthermore, the cement mixing pile penetrates the bearing layer to a depth of ≥1m, and the diameter of the cement mixing pile is 500-600mm.

[0018] Furthermore, the detachable template includes a steel plate and a snap-fit ​​mechanism, wherein the steel plate is detachably installed on the periphery of the central truss structure and the EPS geofoam via the snap-fit ​​mechanism.

[0019] Furthermore, the steel plate and the buckling mechanism comply with current national standards, and their strength and rigidity meet the specifications.

[0020] Furthermore, the EPS foam has a thickness of 200mm to 400mm, a compressive strength of not less than 150kPa, and is a lightweight material.

[0021] The present invention also provides a method for manufacturing a foundation structure based on the above-mentioned fluidized solidified soil, characterized in that it includes:

[0022] The three-dimensional geocell reinforced cushion layer and the geogrid reinforced cushion layer are assembled into an upper reinforced layer and a lower reinforced layer, and a middle truss structure is inserted into the upper reinforced layer and the lower reinforced layer using PVC pipes.

[0023] EPS geofoam is wrapped around the central truss structure and then fixed with detachable templates to form a foundation.

[0024] A group of cement mixing piles is vertically inserted into the silt layer, so that the lower end of the pile bearing structure of the cement mixing pile group enters the bearing layer.

[0025] The foundation is placed horizontally on top of the cement mixing pile group, and fluidized solidified soil is poured into the foundation in layers to form a stable foundation structure.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. By setting up a foundation and cement mixing pile group on the bearing layer, and utilizing the upper and lower reinforcement layers and the middle truss structure, combined with EPS geofoam and detachable formwork, fluidized solidified soil is poured and filled to form the foundation. The cement mixing pile group then crosses the high water content silt layer to form a high-bearing-capacity bottom load-bearing structure. This effectively solves the problem that existing soft soil subgrade reinforcement technology cannot be applied to construction in soft strata with high water content, improving bearing capacity and stability. It eliminates the need for continuous maintenance construction and does not require treatment of the high water content silt layer, significantly reducing the amount of curing agent used and construction difficulty, thus lowering the cost. Furthermore, the foundation construction, mixing pile construction, and precast fluidized solidified soil construction can be carried out simultaneously, accelerating the construction cycle.

[0028] 2. Cement-soil mixing piles are used to reinforce soft soil foundations with high water content. Together with the underlying reinforcement layer, they form a high-bearing-capacity bottom load-bearing structure, effectively controlling settlement differences between piles and the soil between them, and preventing excessive uneven settlement of the overall pile cap structure at the bottom.

[0029] 3. A three-dimensional geocell reinforced cushion layer and a geogrid reinforced cushion layer are formed by filling three-dimensional geocells and geogrids with fluidized solidified soil, and a load-bearing layer is formed by filling the central truss structure. During construction, the three-dimensional geocells, as reinforcement materials, can be tensioned into a mesh, forming a cushion layer skeleton combined with the bottom geogrid. Fluidized solidified silt is then filled as the cushion layer filling material, creating a cushion layer structure with strong lateral confinement and high rigidity, consisting of an upper and lower reinforced layer. This improves the bearing capacity through lateral structural design, evenly distributing vertical loads. PVC pipes, in conjunction with the central truss structure, enhance the soil transfer capacity between the upper and lower reinforced layers, evenly transferring vertical loads. The upper and lower reinforced layers and the central truss structure work together to form a bearing platform with confinement performance on both the upper and lower horizontal planes and all sides, controlling the shear strain of the subgrade, preventing lateral deformation and slippage, improving the bearing capacity of the bearing platform, and further reducing subgrade settlement.

[0030] 4. Using EPS geofoam as a buffer layer. The impact and vibration loads borne by the pier structure are difficult to eliminate. This invention adds lightweight, impact-resistant EPS geofoam to the outside of the central truss structure to form a stable, homogeneous buffer layer, which buffers the impact and vibration loads borne by the pier structure, improves the overall stability, and expands the potential for increasing the bearing capacity of the pier structure.

[0031] 5. Waste-to-waste treatment, economical and environmentally friendly. The fluidized solidified soil prepared using sludge, new cement-based solidification materials, and industrial waste residue meets engineering requirements in terms of strength, saves on sludge disposal costs, and transforms sludge into building material resources, providing a huge amount of building material resources for related engineering projects. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the fluidized solidified soil foundation structure provided in an embodiment of the present invention;

[0033] Figure 2 This is a top view of the three-dimensional geocell reinforced cushion structure provided in the embodiment of the present invention;

[0034] Figure 3 This is a side view of the central truss structure provided in an embodiment of the present invention;

[0035] Figure 4 This is a top view of the central truss structure provided in an embodiment of the present invention;

[0036] Figure 5 It is a construction process drawing of the method for fabricating the foundation structure.

[0037] Among them, 1. Foundation; 11. Upper reinforcement layer; 111. Surface layer; 112. Three-dimensional geocell reinforced cushion layer; 113. Geogrid reinforced cushion layer;

[0038] 12. Buckling mechanism; 121. Steel pipe; 122. Buckle;

[0039] 13. Central truss structure; 131. PVC pipe; 132. Fluidized solidified soil casting;

[0040] 14. EPS geofoam;

[0041] 15. Steel plate;

[0042] 16. Lower reinforcement layer; 161. Three-dimensional geocell reinforced cushion layer; 162. Geogrid reinforced cushion layer;

[0043] 2. Cement mixing pile group; 21. Cement mixing pile; 22. Pile cap;

[0044] 3. Silt layer;

[0045] 4. Bearing layer. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0048] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.

[0049] This invention provides a flowable solidified soil foundation structure, comprising, from top to bottom, the following:

[0050] The foundation 1 includes an upper reinforcement layer 11, a middle truss structure 13, and a lower reinforcement layer 16 arranged sequentially from top to bottom. Both the upper reinforcement layer 11 and the lower reinforcement layer 16 include a longitudinally connected three-dimensional geocell reinforcement pad and a geogrid reinforcement pad. The middle truss structure 13 is filled with fluidized solidified soil. The middle truss structure 13 is surrounded by a detachable template. EPS geofoam 14 is filled between the middle truss structure 13 and the detachable template. The upper reinforcement layer 11 is provided with a surface layer 111 made of fluidized solidified soil.

[0051] Cement mixing pile group 2 is formed by mixing cement with soil stabilizer and solidifying it.

[0052] Support layer 4;

[0053] Among them, the upper end of the cement mixing pile group 2 passes through the original environmental silt layer 3 between the pile cap 1 and the bearing layer 4 and is connected to the bottom of the pile cap 1, while the lower end of the cement mixing pile group 2 extends into the bearing layer 4.

[0054] like Figure 1 As shown, the foundation 1 is formed by pouring fluidized solidified soil after on-site formwork construction, including an upper reinforcing layer 11, a middle truss structure 13, a lower reinforcing layer 16, EPS geofoam 14, a detachable steel plate 15, and a snap-fit ​​mechanism 12 installed outside the detachable steel plate 15. Figure 2 As shown, a geogrid is first laid in the lower reinforcement layer 16, and then three-dimensional geocells are laid horizontally on the geogrid to form a structure. The bottom is inserted into the lower reinforcement layer 16. EPS geofoam 14 surrounds the middle truss structure 13 to form a full-section buffer layer. A detachable steel plate 15 surrounds the EPS geofoam 14 to form a full-section enclosure, forming a casting mold. The upper reinforcing layer 11 is laid in the same manner as the lower reinforcing layer 16, extending to the top surface of the middle truss structure 13 and fixed, so that the upper reinforcing layer 11, the middle truss structure 13, and the lower reinforcing layer 16 form a stable whole. Then, fluidized solidified soil is poured and filled in layers into this stable whole to form the foundation 1. The forming sequence is as follows: the three-dimensional geocell reinforced cushion layer 161, the geogrid reinforced cushion layer 162, and the fluidized solidified soil casting body 132 in the lower reinforcing layer 16, and the three-dimensional geocell reinforced cushion layer 112 and the geogrid reinforced cushion layer 113 in the upper reinforcing layer 11. The middle truss structure 13 can be a PVC pipe truss structure, with the PVC pipe 131 having a specification size of 50-110mm, or other skeletons that can meet the foundation construction requirements can be used.

[0055] As a specific method of forming reinforced cushion layers, three-dimensional geocell reinforced cushion layers 161 and 112 are formed by filling three-dimensional geocells with fluidized solidified soil, and geogrid reinforced cushion layers 162 and 113 are formed by filling geogrids with fluidized solidified soil.

[0056] As a method of producing fluidized solidified soil, fluidized solidified soil is a mixture of cement-based materials and silt, with the silt having a water content of 80-110% and the cement-based material content of 20-30%.

[0057] In order for the strength of the fluidized solidified soil casting body formed by the fluidized solidified soil casting to meet the strength requirements of the roadbed, the slump of the fluidized solidified soil is 180-200mm, and the 28-day strength of the fluidized solidified soil is not less than 3MPa.

[0058] To ensure that the engineering performance of cement mixing pile group 2 meets the bottom bearing requirements, the soil stabilizer consists of the following components by mass fraction: 65%–80% of 42.5 grade silicate cement, 5–15% of blast furnace slag ash, 5–15% of fly ash, and 5–10% of silica fume. The dosage of the soil stabilizer is 20–30 wt%.

[0059] As one structural implementation of the cement mixing pile group 2, the cement mixing pile group 2 includes multiple cement mixing piles 21 with variable cross-sections and pile caps 22 set on top of the cement mixing piles 21. The pile caps 22 are located within the silt layer 3, and the top of the pile caps 22 is located at the bottom of the lower reinforcement layer 16. In order to ensure that the reinforcement strength of the cement mixing pile group 2 meets the design requirements, and given that the silt layer 3 in the original environment has a high water content and poor engineering properties, the cement mixing piles 21 adopt the form of variable cross-section piles to improve the bearing capacity between the silt layers 3. The cement mixing piles 21 should be close to the bottom of the lower reinforcement layer 16. Among them, the upper dimension of the variable cross-section piles gradually increases, and the area of ​​the top surface is not less than 1 / 8 of the bottom surface of the pile cap 1.

[0060] To ensure stable support after the cement mixing pile 21 is constructed, the cement mixing pile 21 penetrates the bearing layer 4 to a depth of ≥1m, and the diameter of the cement mixing pile 21 is 500~600mm.

[0061] As a specific structure of the detachable template, the detachable template includes a detachable steel plate 15 and a snap-fit ​​mechanism 12. The detachable steel plate 15 can be detachably installed on the periphery of the central truss structure 13 and the EPS geofoam 14 through the snap-fit ​​mechanism 12.

[0062] The clamping mechanism 12 includes a steel pipe 121 and a clamp 122 installed outside the detachable steel plate 15. The strength and rigidity of the detachable steel plate 15, steel pipe 121, and clamp 122 meet the performance specifications required during pouring and comply with current national standards. During construction, after the steel pipe 121 and clamp 122 are installed, the fit between the detachable steel plate 15 and the EPS geofoam 14 is checked, and the gaps are filled with the steel plate 15. During the pouring of the fluidized solidified soil, attention should be paid to the deformation of the detachable steel plate 15 and the EPS geofoam 14, and the pouring speed should be controlled at 3m / s. 3 / h.

[0063] In order to achieve the function of buffering the impact and vibration loads on the foundation 1, the thickness of EPS foam is 200mm to 400mm, the compressive strength is not less than 150kPa, and EPS foam is a lightweight material.

[0064] In actual construction, in order to increase the lateral buffering performance of the foundation 1, the laying surface of the lower reinforcing bar 16 at the bottom of the foundation 1 is reserved on both sides of the middle truss structure 13. The reserved space on the side is used to pour slopes or perform other lateral buffering auxiliary operations, as a way to further improve the overall bearing capacity of the foundation structure and expand the space for improving the bearing capacity of the foundation structure.

[0065] The present invention also provides a method for manufacturing a foundation structure based on the above-mentioned fluidized solidified soil 1, comprising:

[0066] The cement mixing pile group 2 is vertically inserted into the silt layer 3 so that the lower end of the cement mixing pile group 2 enters the bearing layer 4.

[0067] A reinforced cushion layer consisting of three-dimensional geocells and geogrids is laid, followed by a lower reinforced layer 16.

[0068] The PVC pipes 131 are assembled into a central truss structure 13 and inserted into the lower reinforcing layer 16.

[0069] The upper stiffening layer 11 is placed horizontally on top of the middle truss structure 13;

[0070] The EPS geofoam 14 is vertically wrapped around the above-mentioned overall structure;

[0071] The detachable template is vertically wrapped around the EPS geofoam 14;

[0072] Place the steel pipe 121 horizontally around the detachable template and tighten it with the clips 122;

[0073] Combine all the above structures into a whole, namely the formwork for the foundation 1 structure;

[0074] The cement mixing pile group 2 is vertically inserted into the silt layer 3, so that the lower end of the cement mixing pile group 2 enters the bearing layer 4.

[0075] The formwork of the foundation 1 structure is placed horizontally on top of the cement mixing pile group 2;

[0076] The foundation 1 structure is formed by layering and solidifying silt into the structural template to create an integral solidified soil-integrated geotextile foundation 1 structure.

[0077] A specific fabrication method for a foundation structure using fluidized solidified soil combined with geotechnical materials, such as Figure 5 As shown, it includes the following steps:

[0078] Step 1: Clean the site and assemble the reinforcement layer.

[0079] Clean and level the installation site, remove debris, and lay the geogrid and three-dimensional geocells horizontally on the ground in sequence. Use a binding method to combine the two into a whole to ensure a reliable connection between the geogrid and the geocells.

[0080] Step 2: Assemble the PVC pipe truss structure.

[0081] The assembly of the PVC pipe truss structure is carried out in two steps. The first step involves tightly connecting multiple PVC pipes 131 using a hot-melt connection method. The middle and both ends of the PVC pipes 131 in each diagonal member are hot-melted, while only the ends of the PVC pipes 131 in the vertical members are hot-melted. This hot-melt connection is performed sequentially from top to bottom until… Figure 3 and Figure 4 The truss shown is now complete. The second step is to use a crane to lift the truss after the heat fusion connection is completed and insert it into the stiffening layer, and then drive it in to ensure a tight connection between the truss and the stiffening layer. Then, the upper stiffening layer 11 is inserted in the same way.

[0082] Step 3: Install the EPS buffer layer and removable template

[0083] For the assembled truss and reinforced layer structure, EPS geofoam 14 is wrapped around the perimeter. The required size of the EPS is accurately calculated, and the width of the gap is measured. Joints can be connected using tape or other methods to ensure water-stopping effect. After the EPS buffer layer is closed, the outer ring is temporarily locked at the top and bottom using tools such as thin ropes. Then, steel plates 15 are wrapped around the perimeter, paying attention to the tightness of the fit and strictly controlling the size of the joints. After closing, steel pipes 121 are used to lock the outer ring. The connection of steel pipes 121 is based on the deformation of EPS geofoam 14, controlling the deformation between 10 and 30 mm to ensure the normal operation of the formwork.

[0084] Step 4: Construct variable cross-section mixing piles within the design area.

[0085] The mixing piles are arranged in a uniform square pattern and reinforced using a mixing machine and a feeding device. The curing agent is a dry powder composed of 42.5 grade silicate cement and industrial waste residue, with a cement dosage of 270 kg / m³. 3 The stirring head lifting speed is 10-20 cm / min, and the rotation speed is 20-30 r / min. The pressure is controlled at 30 MPa, and the flow rate is 80-100 L / min. The upper dimension of the variable cross-section pile gradually increases, and is not less than 1 / 8 of the structure of pile cap 1.

[0086] The construction of cement mixing pile group 2 adopts the "four spraying and four mixing" process, which includes pile point layout, sinking and spraying, mixing and lifting, and pile quality inspection. The curing time is no less than 3 days.

[0087] Step 5: Placement of the foundation structure and pouring of the fluidized solidified soil

[0088] After the cement mixing piles 21 meet the design requirements, the foundation structure 1 is hoisted and fixed using steel pipe 121 inserted for limiting. The tilt is checked to ensure the structure is laid horizontally on the mixing pile group. The initial and final setting times of the fluidized solidified soil are 6 hours and 12 hours respectively. The upper layer pouring should be carried out after the lower layer has fully set, and the backfill height should be controlled at 2-3 meters. Leakage and runoff of the fluidized solidified soil during backfilling should be prevented, as this could affect structural construction. The pre-mixed fluidized solidified soil is mixed in a safe area. During the original soil preparation process, soil volume calculations and quality testing, as well as ensuring the presence of no garbage or impurities in the mixed solidified soil, are crucial. The fluidity of the fluidized solidified soil is strictly controlled during pouring. For continuous pouring, the ratio is calculated every 100m³. 3 Sample preparation follows the same procedures as concrete test blocks. Slump should be controlled between 180mm and 200mm, and 28-day strength should exceed 3MPa. After pouring to the design elevation, check the elevation and flatness. Use mechanical smoothing for areas exceeding the design elevation, and promptly fill low-lying areas with slurry.

[0089] Step Six: Maintenance and Acceptance of the Foundation Structure

[0090] After pouring, the concrete can be covered with straw or plastic film for curing, and the curing time should not be less than 7 days. During the curing period, pay attention to watering. After curing, the load-bearing capacity of the foundation structure should be tested and accepted.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the content of this specification should be included within the protection scope of the present invention.

Claims

1. A fluidized solidified soil foundation structure, characterized in that, Including settings from top to bottom: The foundation comprises, from top to bottom, an upper reinforcing layer, a middle truss structure, a lower reinforcing layer, and a fluidized solidified soil casting body filled within the foundation. Both the upper and lower reinforcing layers include longitudinally connected three-dimensional geocell reinforced pads and geogrid reinforced pads. The middle truss structure is surrounded by a removable template, and EPS geofoam is filled between the middle truss structure and the removable template. A surface layer is provided on top of the upper reinforcing layer. The three-dimensional geocell reinforced pad is formed by filling three-dimensional geocells with fluidized solidified soil, and the geogrid reinforced pad is formed by filling geogrids with fluidized solidified soil. The middle truss structure is a PVC pipe truss structure. A cement mixing pile group, wherein the cement mixing pile group is formed by mixing cement with a soil stabilizer and solidifying it; Bearing layer; The upper end of the cement mixing pile group passes through the silt layer between the foundation and the bearing layer and connects to the bottom of the foundation, while the lower end of the cement mixing pile group extends into the bearing layer.

2. The fluidized solidified soil foundation structure according to claim 1, characterized in that, The fluidized solidified soil is a mixture of cement-based materials and silt.

3. The fluidized solidified soil foundation structure according to claim 1, characterized in that, The slump of the fluidized solidified soil is 180-200 mm, and the 28-day strength of the fluidized solidified soil is not less than 3 MPa.

4. The fluidized solidified soil foundation structure according to claim 1, characterized in that, The cement mixing pile group includes multiple cement mixing piles with variable cross-sections and pile caps set on top of the cement mixing piles. The pile caps are located within the silt layer, and the top of the pile caps is located at the bottom of the lower reinforcement layer.

5. The fluidized solidified soil foundation structure according to claim 4, characterized in that, The cement mixing pile penetrates the bearing layer to a depth of ≥1m, and the diameter of the cement mixing pile is 500~600mm.

6. The fluidized solidified soil foundation structure according to claim 1, characterized in that, The detachable template includes a steel plate and a snap-fit ​​mechanism. The steel plate is detachably installed on the periphery of the central truss structure and the EPS geofoam through the snap-fit ​​mechanism.

7. The fluidized solidified soil foundation structure according to claim 1, characterized in that, The EPS geofoam has a thickness of 200mm~400mm and a compressive strength of not less than 150kPa.

8. A method for manufacturing a foundation structure based on any one of claims 1-7 of the fluidized solidified soil, characterized in that, include: The three-dimensional geocell reinforced cushion layer and the geogrid reinforced cushion layer are assembled into an upper reinforced layer and a lower reinforced layer, and a middle truss structure is assembled using PVC pipes and inserted into the upper reinforced layer and the lower reinforced layer. EPS geofoam is wrapped around the central truss structure and then fixed with detachable templates to form a foundation. A group of cement mixing piles is vertically inserted into the silt layer, so that the lower end of the pile bearing structure of the cement mixing pile group enters the bearing layer. The foundation is placed horizontally on top of the cement mixing pile group, and fluidized solidified soil is poured into the foundation in layers to form a stable foundation structure.

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