A treatment method for collapsible loess foundation

Abstract

The present application relates to the technical field of soil improvement, and in particular to a method for treating collapsible loess foundations, comprising: S1: inserting a plurality of compaction reinforcement piles into the soil of the collapsible loess area, and injecting water into the inner cavity of the compaction reinforcement piles as the insertion depth of the compaction reinforcement piles increases; S2: after the compaction reinforcement piles are inserted to a set depth, adding reinforcement waste into the inner cavity of the compaction reinforcement piles, and simultaneously extracting water from the inner cavity of the compaction reinforcement piles while adding the material, and controlling the water level in the inner cavity of the compaction reinforcement piles to be not lower than the surface of the collapsible loess area; S3: after the reinforcement waste has completely replaced all the water in the compaction reinforcement piles, tamping the reinforcement waste in the compaction reinforcement piles to a preset density; S4: adding reinforcement waste again and tamping until the reinforcement waste is flush with the pile mouth of the compaction reinforcement pile; the present application has the effect of avoiding the possibility of low treatment efficiency caused by collapse when adding waste to increase the bearing capacity of the collapsible loess foundation.

Description

Technical Field

[0001] The present application relates to the technical field of soil improvement, and particularly to a method for treating collapsible loess foundation. Background Art

[0002] A collapsible loess foundation refers to soil that undergoes significant additional deformation due to the destruction of its structure after being soaked in water under the action of the self-weight stress of the overlying soil layer, or under the combined action of self-weight stress and additional stress. This type of soil is widely distributed in parts of Northeast, Northwest, Central, and East China in China. In order to improve the bearing capacity of the collapsible loess foundation, it is necessary to treat it to eliminate the collapsibility of the loess.

[0003] A new type of foundation treatment method for utilizing waste materials in collapsible loess is disclosed in the prior art, including the following steps: Step 1: Excavate the foundation pit to the design elevation; Step 2: Use a column hammer to punch and expand the pile to form a hole according to the design positioning; Step 3: Crush and screen coal gangue, select coal gangue with a maximum side length less than 250 for the pile foundation, and collect coal fines for burning to obtain calorific value; Step 4: Mix the raw materials according to a predetermined ratio, and the mixture should have good gradation; Step 5: Fill the completed pile hole with the mixture, adding about 800 - 900 high each time; Step 6: Use a column hammer to tamp the mixture, and water is poured along the wall of the pile barrel during the construction process. The mixture and water are mixed in a weight ratio of 92:8; Step 7: The number of tamping times each time is based on the final cumulative settlement less than 100; Step 8: Tamp and fill to the design elevation, complete one pile, and continue with the next pile; Step 9: After all the piles are completed, uniformly lay 150 to 300 thick lime-soil on the pile top, and the peripheral range of the lime-soil should exceed the outermost pile edge by 2000; Step 10: Mechanically roll the lime-soil, and appropriately add crushed stones to the lime-soil to achieve compaction of the lime-soil; Step 11: Conduct static load testing on the piles, and after passing, the next step of foundation construction can be carried out.

[0004] In view of the above related technologies, by excavating a foundation pit and drilling pile holes in the collapsible loess area that needs to be strengthened, and then putting waste materials such as coal gangue, coal ash, and crushed stones into the pile holes and tamping them to strengthen the soil. However, during the process from clearing the hole after the pile hole is drilled to putting in waste materials such as coal gangue, coal ash, and crushed stones, due to the poor stability of the collapsible loess area, there may be hole collapse, which affects the treatment efficiency of the collapsible loess foundation. Summary of the Invention

[0005] In order to avoid the possibility of low treatment efficiency caused by hole collapse when putting in waste materials to increase the bearing capacity of the collapsible loess foundation, the present application provides a method for treating collapsible loess foundation.

[0006] A method for treating collapsible loess foundation provided by the present application adopts the following technical solution:

[0007] A method for treating collapsible loess foundation, including:

[0008] S1: Insert multiple compaction reinforcement piles into the soil of the collapsible loess area. The compaction reinforcement piles are hollow and have a feeding port at the top. As the compaction reinforcement piles are inserted deeper, water is injected into the compaction reinforcement piles to keep the liquid level above the surface of the collapsible loess area.

[0009] S2: After the compaction reinforcement pile is inserted to the set depth, reinforcement waste is added into the compaction reinforcement pile cavity through the feeding port. At the same time, water in the compaction reinforcement pile cavity is extracted, and the water level in the compaction reinforcement pile cavity is controlled to be no lower than the surface of the collapsible loess area;

[0010] S3: The waste materials to be reinforced completely replace all the water in the compacted reinforcement pile, and the waste materials in the compacted reinforcement pile are compacted through the feeding port to reduce the gaps between the waste materials to a preset density;

[0011] S4: Reinforcement waste is added again into the cavity at the upper end of the compacted reinforcement pile left after the reinforcement waste is compacted and compacted until the reinforcement waste in the inner cavity of the compacted reinforcement pile is flush with the pile mouth of the compacted reinforcement pile.

[0012] By adopting the above technical solution, a plurality of compaction reinforcement piles are inserted into the soil of the collapsible loess area, wherein the compaction reinforcement piles are hollow and have a feeding port on the top, and as the insertion depth of the compaction reinforcement piles increases, water is simultaneously injected into the inner cavity of the compaction reinforcement piles and the liquid level is higher than the surface of the collapsible loess area; after the compaction reinforcement piles are inserted to the set depth, reinforcement waste is added into the inner cavity of the compaction reinforcement piles through the feeding port, and while adding the material, the water in the inner cavity of the compaction reinforcement piles is simultaneously extracted, and the water level in the inner cavity of the compaction reinforcement piles is controlled to be not lower than the surface of the collapsible loess area; after the reinforcement waste replaces all the water in the compaction reinforcement piles, the reinforcement waste in the compaction reinforcement piles is rammed through the feeding port so that the gaps between the reinforcement wastes are reduced. Small to a preset density; reinforcing waste is added again into the cavity at the upper end of the compaction reinforcement pile left after the compaction of the reinforcing waste and compacted until the reinforcing waste in the inner cavity of the compaction reinforcement pile is flush with the pile mouth of the compaction reinforcement pile; the designed treatment method for collapsible loess foundation can be inserted into the collapsible loess foundation through the hollow compaction reinforcement pile, and provide a cavity for the reinforcing waste to extend into the collapsible loess foundation and not prone to collapse, and through simultaneous water injection and simultaneous water pumping after feeding, the pressure difference between the inside and outside of the compaction reinforcement pile can be reduced, and then, on the basis of the support of the compaction reinforcement pile, when inserting and feeding to increase the bearing capacity of the collapsible loess foundation, the possibility of low treatment efficiency caused by collapse can be avoided.

[0013] In a specific embodiment, step S1 includes:

[0014] S11: Insert multiple partition boards into the collapsible loess area, and the multiple partition boards enclose a strengthening area.

[0015] S12: Insert multiple compaction strengthening piles into the collapsible loess area soil within the strengthening area. Among them, the compaction strengthening piles are hollow inside and there is a feeding port at the top. And as the insertion depth of the compaction strengthening piles increases, water is simultaneously injected into the inner cavity of the compaction strengthening piles and the liquid level is made higher than the surface of the collapsible loess area.

[0016] By adopting the above technical solution, multiple partition boards form a strengthening area, and then compaction strengthening piles are inserted into the strengthening area, which can narrow the strengthening effect range after the compaction strengthening piles are inserted into the soil, and improve the compaction effect within the strengthening area, thereby improving the bearing capacity of the soil.

[0017] In a specific feasible implementation scheme, in the step S11, after the partition boards are inserted in place, adjacent two partition boards are connected by connecting pieces until the multiple partition boards enclosing the partition area are connected to form an integral structure.

[0018] By adopting the above technical solution, connecting multiple partition boards to form an integral structure can reduce the influence of different compactness in each horizontal direction of the collapsible loess on the force uniformity of the partition boards.

[0019] In a specific feasible implementation scheme, in the step S11, there is an overlapping area between adjacent two partition boards.

[0020] By adopting the above technical solution, the designed adjacent two partition boards with an overlapping area can reduce the water flow penetration speed between the inside and outside of the strengthening area, thereby facilitating the control of the water content of the soil within the strengthening area, and thus ensuring the bearing capacity of the soil within the strengthening area.

[0021] In a specific feasible implementation scheme, in the step S1, a plurality of strengthening guiding strips are connected to the outer peripheral side of the compaction strengthening piles inserted into the collapsible loess area, and the strengthening guiding strips are arranged along the axial direction of the compaction strengthening piles.

[0022] By adopting the above technical solution, the designed strengthening guiding strips can, firstly, improve the structural strength of the compaction strengthening piles and reduce the possibility of depression after being inserted into the collapsible loess, and secondly, can also serve as a movement guide during the insertion process and reduce the possibility of deviation in the verticality during the insertion process of the compaction strengthening piles.

[0023] In a specific feasible implementation scheme, in the step S1, through holes are formed on the strengthening guiding strips. During the process of inserting the compaction strengthening piles into the soil, by controlling the tension applied to the direction control cable passing through the through holes, the control of the insertion direction of the compaction strengthening piles is achieved.

[0024] By adopting the above technical solution, the insertion direction of the compaction and reinforcement pile can be controlled by controlling the tension applied to the control cable, thereby facilitating the maintenance of the verticality of the compaction and reinforcement pile.

[0025] In a specific feasible implementation scheme, in step S1, the compaction reinforcement pile includes a soil-breaking head and multiple splicing sections. Before being inserted into the collapsible loess area, the soil-breaking head and the splicing sections, as well as between two adjacent splicing sections, are fixed by reinforcing guide strips.

[0026] By adopting the above technical solution, the compacted reinforced pile including the earth-breaking head and the splicing section is designed, which can form a reinforced waste accommodating cavity while reducing the initial transportation cost and processing cost.

[0027] In a specific feasible implementation scheme, in step S1, a plurality of seepage holes are formed on the compaction reinforcement pile, and before the compaction reinforcement pile is inserted into the soil of the collapsible loess area, the seepage holes are blocked with degradable materials, and a water control pipe is buried in the compaction reinforcement pile.

[0028] By adopting the above technical solution, the designed seepage holes and water control pipes can extract or input water into the inner cavity of the compaction reinforcement pile through the water control pipes, thereby controlling the moisture content of the collapsible loess in the reinforcement area, so that the soil bearing capacity is maintained at a relatively stable level.

[0029] In a specific feasible implementation plan, in step S4, when the reinforcing waste in the inner cavity of the compaction and reinforcement column is flush with the pile mouth of the compaction and reinforcement pile, the upper edge of the compaction and reinforcement pile is set higher than the surface of the soil in the collapsible loess area, and the feeding port at the upper end of the compaction and reinforcement pile is closed.

[0030] By adopting the above technical solution, the upper edge of the compaction reinforcement pile is higher than the soil surface in the collapsible loess area, which can prevent surface water in the collapsible loess area from entering the compaction reinforcement pile through the feeding port.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] The designed treatment method for collapsible loess foundation can insert hollow compaction reinforcement piles into the collapsible loess foundation, and provide a cavity for the reinforcement waste to extend into the collapsible loess foundation and not easily collapse. Moreover, by synchronous water injection and synchronous water pumping after feeding, the pressure difference between the inside and outside of the compaction reinforcement pile can be reduced. Then, on the basis of the support of the compaction reinforcement pile, when inserting and feeding to increase the bearing capacity of the collapsible loess foundation, the possibility of low treatment efficiency caused by collapse can be avoided.

[0033] For the treatment method of collapsible loess foundation designed, multiple partition plates form a strengthening area, and then compaction strengthening piles are inserted into the strengthening area, which can narrow the strengthening effect range after the compaction strengthening piles are inserted into the soil mass, and improve the compaction effect in the strengthening area, thereby improving the bearing capacity of the soil mass.

[0034] For the treatment method of collapsible loess foundation designed, hollow compaction strengthening piles can be inserted into the collapsible loess foundation, and provide a cavity that extends into the collapsible loess foundation and is not prone to hole collapse for the strengthening waste. And by simultaneously injecting water and feeding materials and then simultaneously pumping water, the pressure difference between the two sides of the compaction strengthening pile can be reduced. Furthermore, on the basis of the support of the compaction strengthening pile, when inserting and feeding materials to increase the bearing capacity of the collapsible loess foundation, the possibility of low treatment efficiency caused by hole collapse can be avoided. Description of the Drawings

[0035] Figure 1 It is a schematic diagram of the state when the compaction strengthening pile is inserted into the soil mass and water is injected synchronously in the treatment method of collapsible loess foundation in the embodiment of the present application.

[0036] Figure 2 It is a schematic diagram of the state after the compaction strengthening pile is inserted in place and part of the strengthening waste has been put in through the feeding port.

[0037] Figure 3 It is in Figure 2 It is a schematic diagram of the state to be tamped after the first placement of the strengthening waste is completed on the basis.

[0038] Figure 4 It is a schematic diagram of the state when the strengthening waste in the inner cavity of the compaction strengthening pile is flush with the pile mouth of the compaction strengthening pile.

[0039] Figure 5 It is in Figure 4 It is a top view after adding partition plates on the basis.

[0040] Figure 6 It is in Figure 5 It is a schematic diagram of the state after making the adjacent two partition plates have an overlapping area and fixing them through connecting pieces on the basis.

[0041] Figure 7 It is a schematic diagram of the connection structure between the segmented compaction strengthening pile and the strengthening guide bar in the embodiment of the present application.

[0042] Figure 8 It is in Figure 7 It is a schematic diagram of the structure after adding a control cable on the basis.

[0043] Figure 9 It is in Figure 8 It is a schematic diagram of the structure after further setting a water control pipe on the basis.

[0044] Explanation of the accompanying symbols: 1. Compacted reinforced pile; 11. Ground breaking head; 12. Splicing section; 13. Feeding port; 2. Partition plate; 3. Connector; 4. Reinforced guide strip; 5. Directional control cable; 6. Water control pipe. DETAILED DESCRIPTION

[0045] The following is combined with Figures 1-9 This application is described in further detail.

[0046] The embodiments of the present application disclose a method for treating collapsible loess foundation.

[0047] Reference Figure 1 A method for treating collapsible loess foundation comprises:

[0048] Reference Figure 1 S1: inserting a plurality of compaction reinforcement piles 1 into the soil of the collapsible loess area. The compaction reinforcement piles 1 can be inserted by any one of the processes such as hammering, vibration, and static pressure, as long as the compaction reinforcement piles 1 can be vertically inserted into the soil to a specified depth. The compaction reinforcement piles 1 are hollow and have a feeding port 13 on the top. As the insertion depth of the compaction reinforcement piles 1 increases, water is simultaneously injected into the inner cavity of the compaction reinforcement piles 1 so that the liquid level is higher than the surface of the collapsible loess area.

[0049] Reference Figure 2 , S2: After the compaction and reinforcement pile 1 is inserted to the set depth, reinforcement waste is added into the inner cavity of the compaction and reinforcement pile 1 through the feeding port 13, and the water in the inner cavity of the compaction and reinforcement pile 1 is simultaneously extracted while adding the material, and the liquid level of the water body in the inner cavity of the compaction and reinforcement pile 1 is controlled to be not lower than the surface of the collapsible loess area. In this embodiment, in the process of adding reinforcement waste into the inner cavity of the compaction and reinforcement pile 1, the liquid level of the water body in the inner cavity of the compaction and reinforcement pile 1 is kept roughly aligned with the plane of the surface of the collapsible loess area. In order to facilitate the reinforcement waste to quickly enter the inner cavity of the compaction and reinforcement pile 1 through the feeding port 13, a temporary funnel-shaped feeding hopper is inserted on the feeding port 13;

[0050] Reference Figure 3 S3: The waste material to be reinforced completely replaces all the water in the compacted reinforced pile 1, and the reinforced waste material in the compacted reinforced pile 1 is compacted through the feeding port 13 so that the gaps between the reinforced waste materials are reduced to a preset density;

[0051] Reference Figure 4 S4: Adding reinforcing waste into the cavity at the upper end of the compacted reinforced pile 1 left after the reinforcing waste is compacted and tamping it until the reinforcing waste in the inner cavity of the compacted reinforced pile 1 is flush with the pile mouth of the compacted reinforced pile 1.

[0052] Reference Figure 5 , further, step S1 includes:

[0053] S11: Insert multiple partition plates 2 into the collapsible loess area by any one of the processes such as hammering method, vibration method, static pressure method, etc., and the multiple partition plates 2 enclose a strengthening area. Among them, the partition plates 2 can be arc-shaped, linear, or other shapes, as long as they can enclose the strengthening area;

[0054] S12: Insert multiple compaction strengthening piles 1 into the soil mass of the collapsible loess area within the strengthening area. Among them, the compaction strengthening piles 1 are hollow and have a feeding port 13 at the top, and as the insertion depth of the compaction strengthening piles 1 increases, water is simultaneously injected into the inner cavity of the compaction strengthening piles 1 and the liquid level is higher than the surface of the collapsible loess area; the multiple partition plates 2 form a strengthening area, and then the compaction strengthening piles 1 are inserted into the strengthening area, which can reduce the strengthening action range after the compaction strengthening piles 1 are inserted into the soil and improve the compaction effect within the strengthening area, thereby improving the bearing capacity of the soil mass.

[0055] Refer to Figure 6 , in order to reduce the influence of the different compactness of the collapsible loess in each horizontal direction on the force uniformity of the partition plates 2, in step S11, after the partition plates 2 are inserted in place, adjacent two partition plates 2 are connected by a connecting member 3 until the multiple partition plates 2 enclosing the partition area are connected to form an integral structure. In this application, the connecting member 3 can be a connecting steel cable, a connecting bar plus fastening bolts, or other connecting structures, as long as it can realize the connection of adjacent two partition plates 2; there is an overlapping area between adjacent two partition plates 2. The adjacent two partition plates 2 with an overlapping area can reduce the water flow penetration speed between the inside and outside of the strengthening area, thereby facilitating the control of the water content of the soil mass inside the strengthening area, and thus ensuring the bearing capacity of the soil mass inside the strengthening area.

[0056] Refer to Figure 7 , further, in step S1, a plurality of strengthening guiding strips 4 are connected to the outer peripheral side of the compaction strengthening piles 1 inserted into the collapsible loess area, and the strengthening guiding strips 4 are arranged along the axial direction of the compaction strengthening piles 1; through the strengthening guiding strips 4, firstly, the structural strength of the compaction strengthening piles 1 can be improved, reducing the possibility of depression after being inserted into the collapsible loess, and secondly, it can also be used as a movement guide during the insertion process, reducing the possibility of deviation in the verticality of the compaction strengthening piles 1 during the insertion process.

[0057] Refer to Figure 8 , even further, in order to control the insertion direction of the compaction strengthening piles 1 when there is a deviation in the verticality of the compaction strengthening piles 1, through holes are provided on the strengthening guiding strips 4. During the process of inserting the compaction strengthening piles 1 into the soil, by controlling the tension applied to the direction control cable 5 passing through the through holes, the control of the insertion direction of the compaction strengthening piles 1 in the collapsible loess is realized.

[0058] Refer to Figure 8In order to reduce the initial transportation and processing costs while forming a reinforced waste accommodating cavity, in step S1, the compaction reinforcement pile 1 includes a soil-breaking head 11 and multiple splicing sections 12. The soil-breaking head 11 has a pointed end. Before being inserted into the collapsible loess area, the soil-breaking head 11 and the splicing section 12, as well as the adjacent splicing sections 12, are fixed by reinforced guide strips 4.

[0059] Reference Figure 9 Furthermore, in step S1, a plurality of seepage holes are formed on the compaction and reinforcement pile 1, and before the compaction and reinforcement pile 1 is inserted into the soil of the collapsible loess area, the seepage holes are blocked with a degradable material, and a water control pipe 6 is buried in the compaction and reinforcement pile 1. The water control pipe 6 can be a water pipe with a certain permeability, or it can be an impermeable pipe with a plurality of water holes opened along the length direction of the water control pipe 6; water can be extracted or input into the inner cavity of the compaction and reinforcement pile 1 through the water control pipe 6, thereby controlling the water content of the collapsible loess in the reinforcement area, so that the soil bearing capacity is maintained at a relatively stable level.

[0060] Reference Figure 9 In order to prevent surface water in the collapsible loess area from entering the compaction and reinforcement pile 1 through the feeding port 13, in step S4, when the reinforcement waste in the inner cavity of the compaction and reinforcement column is flush with the pile mouth of the compaction and reinforcement pile 1, the upper edge of the compaction and reinforcement pile 1 is set higher than the surface of the soil in the collapsible loess area, and the feeding port 13 at the upper end of the compaction and reinforcement pile 1 is closed.

[0061] The implementation principle of a method for treating collapsible loess foundation in an embodiment of the present application is as follows: A plurality of compaction and strengthening piles 1 are inserted into the soil body in the collapsible loess area. Among them, the compaction and strengthening piles 1 are hollow and have a feeding port 13 at the top. And as the insertion depth of the compaction and strengthening piles 1 increases, water is simultaneously injected into the inner cavity of the compaction and strengthening piles 1 and the liquid level is made higher than the surface of the collapsible loess area; after the compaction and strengthening piles 1 are inserted to the set depth, strengthening waste is put into the inner cavity of the compaction and strengthening piles 1 through the feeding port 13. While feeding, the water in the inner cavity of the compaction and strengthening piles 1 is simultaneously pumped out, and the liquid level of the water body in the inner cavity of the compaction and strengthening piles 1 is controlled not to be lower than the surface of the collapsible loess area; after the strengthening waste completely replaces the water in the compaction and strengthening piles 1, the strengthening waste in the compaction and strengthening piles 1 is tamped through the feeding port 13 so that the gaps between the strengthening waste are reduced to the preset density; strengthening waste is put into the cavity at the upper end of the compaction and strengthening piles 1 left after the strengthening waste is tamped and tamped until the strengthening waste in the inner cavity of the compaction and strengthening piles 1 is flush with the pile opening of the compaction and strengthening piles 1; the hollow compaction and strengthening piles 1 can be inserted into the collapsible loess foundation to provide a cavity that extends into the collapsible loess foundation and is not prone to hole collapse for the strengthening waste. And by simultaneously injecting water and feeding and then simultaneously pumping water, the pressure difference between the inner and outer sides of the compaction and strengthening piles 1 can be reduced. Furthermore, on the basis of the support of the compaction and strengthening piles 1, when increasing the bearing capacity of the collapsible loess foundation during insertion and feeding, the possibility of low treatment efficiency caused by hole collapse can be avoided.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A method for treating collapsible loess foundation, characterized in that: include: S1: inserting a plurality of compaction reinforcement piles (1) into the soil of the collapsible loess area, wherein the compaction reinforcement piles (1) are hollow and have a feeding port (13) at the top, and as the insertion depth of the compaction reinforcement piles (1) increases, water is simultaneously injected into the inner cavity of the compaction reinforcement piles (1) to make the liquid level higher than the surface of the collapsible loess area; S2: After the compaction reinforcement pile (1) is inserted to the set depth, reinforcement waste is added into the inner cavity of the compaction reinforcement pile (1) through the feeding port (13), and water in the inner cavity of the compaction reinforcement pile (1) is simultaneously extracted while adding the material, and the liquid level of the water in the inner cavity of the compaction reinforcement pile (1) is controlled to be no lower than the surface of the collapsible loess area; S3: The waste material to be reinforced completely replaces the water in the compacted reinforced pile (1), and the reinforced waste material in the compacted reinforced pile (1) is rammed through the feeding port (13) so that the gaps between the reinforced waste materials are reduced to a preset density; S4: Reinforcement waste is added to the cavity at the upper end of the compacted reinforcement pile (1) left after the reinforcement waste is compacted and compacted until the reinforcement waste in the inner cavity of the compacted reinforcement pile (1) is flush with the pile mouth of the compacted reinforcement pile (1).

2. The treatment method of collapsible loess foundation according to claim 1, characterized in that: The step S1 comprises: S11: inserting a plurality of partition plates (2) into the collapsible loess area, and the plurality of partition plates (2) enclose a reinforcement area; S12: inserting a plurality of compaction reinforcement piles (1) into the soil of the collapsible loess region within the reinforcement zone, wherein the compaction reinforcement piles (1) are hollow and have a feeding port (13) at the top, and as the insertion depth of the compaction reinforcement piles (1) increases, water is simultaneously injected into the inner cavity of the compaction reinforcement piles (1) to make the liquid level higher than the surface of the collapsible loess region.

3. The method for treating collapsible loess foundation according to claim 2, characterized in that: In step S11, after the partition plates (2) are inserted into place, two adjacent partition plates (2) are connected using a connector (3) until the plurality of partition plates (2) forming the partition area are connected to form an integral structure.

4. The treatment method for collapsible loess foundation according to claim 2, wherein: In the step S11, there is an overlapping area between two adjacent partition plates (2).

5. The method for treating collapsible loess foundation according to claim 1, characterized in that: In step S1, a plurality of reinforcing guide bars (4) are connected to the outer peripheral side of the compaction reinforcement pile (1) inserted into the collapsible loess area, and the reinforcing guide bars (4) are arranged along the axial direction of the compaction reinforcement pile (1).

6. The treatment method of collapsible loess foundation according to claim 5, characterized in that: In step S1, the compaction reinforcement pile (1) comprises a soil-breaking head (11) and a plurality of splicing sections (12). Before being inserted into the collapsible loess area, the soil-breaking head (11) and the splicing sections (12), as well as between two adjacent splicing sections (12), are fixed by reinforcing guide strips (4).

7. The treatment method for collapsible loess foundation according to claim 5, characterized in that: In step S1, a through hole is provided on the reinforcing guide strip (4), and during the process of inserting the compaction reinforcement pile (1) into the soil, the insertion direction of the compaction reinforcement pile (1) is controlled by controlling the tension applied to the control cable (5) passing through the through hole.

8. The treatment method of collapsible loess foundation according to claim 1, characterized in that: In step S1, a plurality of water seepage holes are formed on the compaction reinforcement pile (1), and before the compaction reinforcement pile (1) is inserted into the soil of the collapsible loess area, the water seepage holes are blocked with a degradable material, and a water control pipe (6) is buried in the compaction reinforcement pile (1).

9. The method for treating collapsible loess foundation according to claim 1, characterized in that: In the step S4, when the strengthening waste in the inner cavity of the compaction strengthening column is flush with the pile opening of the compaction strengthening pile (1), the upper edge of the compaction strengthening pile (1) is arranged higher than the ground surface of the collapsible loess area, and the feeding port (13) at the upper end of the compaction strengthening pile (1) is sealed.

Images