Composite stirring pile with self-healing repairing capability and self-healing repairing method thereof

Abstract

The invention relates to the technical field of civil engineering, in particular to a composite stirring pile with self-healing repairing capacity and a self-healing repairing method thereof.The composite stirring pile comprises a coaxial pile core and an annular pile shell wrapping the periphery of the pile core, the pile core is a flexible pile body and is in a softened flow state after being heated, and the annular pile shell is a rigid pile body. The seepage pressure value of the annular pile shell is monitored through the monitoring assembly, the heating assembly heats the pile core when receiving a seepage pressure abnormal signal of the monitoring assembly, the pile core is made to be in a softening flow state, and automatic plugging of cracks is conducted. Through the combination of a rigid-flexible composite structure (coaxial composite pile body) and a self-healing repairing system, the contradiction that a single material cannot give consideration to the bearing capacity and deformation adaptability is fundamentally solved, the pile body has high strength and good toughness at the same time, the pile body is endowed with the intelligent characteristics of damage self-diagnosis and self-healing, and the self-healing performance of the pile body is improved. Passive maintenance is changed into active repair, and the long-term durability and safety of a project are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a composite mixing pile with self-healing repair capability and a self-healing repair method thereof. Background Technology

[0002] In water conservancy projects, road engineering, and various civil engineering constructions, deep, soft plastic / fluid plastic silt and other weak foundations are often encountered. These foundations have low bearing capacity and high compressibility, posing significant stability and deformation risks when directly constructing on them. Mixing piles, a common foundation treatment method, forcibly mix a solidifying agent with the foundation soil to form a reinforcing body, and are widely used for the reinforcement and seepage prevention of such foundations.

[0003] Traditional mixing piles mostly use a single material system, primarily cement-soil mixing piles or asphalt-soil mixing piles. Cement-soil mixing piles have the advantages of high strength and strong bearing capacity, but their material is relatively brittle and prone to cracking under uneven loads or foundation deformation, affecting their seepage prevention performance and long-term stability. Asphalt-soil mixing piles, on the other hand, have good flexibility and excellent seepage prevention performance, and can adapt to certain deformations, but their strength is lower and their bearing capacity is limited, making them difficult to use as independent load-bearing structures.

[0004] Existing technologies attempt to improve the performance of mixing piles by modifying materials or optimizing construction parameters. For example, some solutions propose different cement-soil ratios or the addition of admixtures, while others focus on improving construction machinery and processes. However, most of these solutions fail to fundamentally resolve the inherent contradiction between "rigidity" and "flexibility." More importantly, neither cement-soil piles nor asphalt-soil piles possess self-repairing capabilities after cracking. Once cracks develop due to fatigue, settlement, or external loads, their performance irreversibly deteriorates, requiring expensive and cumbersome external intervention for repair, or even reconstruction, significantly increasing maintenance and time costs. Summary of the Invention

[0005] This invention provides a composite mixing pile with self-healing repair capability and its self-healing repair method, which solves the defects of traditional mixing piles in the prior art that cannot simultaneously achieve the performance of seepage prevention and rigid bearing, and do not have self-healing capability.

[0006] This invention provides a composite mixing pile with self-healing repair capability, comprising a coaxial composite pile body and a self-healing repair system. The coaxial composite pile body includes a pile core located at the center and an annular pile shell coaxially covering the outer periphery of the pile core. The pile core is a flexible pile body, which is solidified at room temperature and softens and flows when heated. The annular pile shell is a rigid pile body. The self-healing repair system includes a monitoring component embedded in the annular pile shell and a heating component activated in response to feedback from the monitoring component. The monitoring component is used to monitor the permeability pressure value of the annular pile shell, and the heating component is used to heat the pile core when it receives an abnormal permeability pressure signal from the monitoring component, causing the pile core to soften and flow.

[0007] According to the present invention, a composite mixing pile with self-healing repair capability is provided, wherein the pile core is an asphalt-soil mixing pile with a diameter of 0.8 to 1.2 meters; the annular pile shell is a cement-soil mixing pile with a thickness of 0.2 to 0.3 meters; and the overall diameter of the coaxial composite pile body is 1.4 to 1.6 meters.

[0008] According to the present invention, a composite mixing pile with self-healing repair capability is provided, wherein the monitoring component includes a piezometer, which is embedded in the annular pile shell or embedded in the outer circumference of the annular pile shell.

[0009] According to the present invention, a composite mixing pile with self-healing repair capability is provided, wherein the monitoring component includes multiple sets of the piezometers, and the multiple sets of piezometers are uniformly distributed along the circumference and axial direction of the annular pile shell.

[0010] According to the present invention, a composite mixing pile with self-healing repair capability is provided, wherein the heating component includes a heating rod disposed at the interface between the pile core and the annular pile shell.

[0011] According to the present invention, a composite mixing pile with self-healing repair capability is provided, wherein the heating component includes a plurality of heating rods, which are uniformly arranged around the pile core in a circumferential direction.

[0012] According to the present invention, a composite mixing pile with self-healing repair capability is provided, wherein the heating rod has a power of 5~8kW and the working temperature control range of the heating rod is 60~80℃, so as to ensure that the pile core is fully softened and melted while avoiding aging or combustion.

[0013] This invention also provides a self-healing repair method for composite mixing piles, applicable to composite mixing piles with self-healing repair capabilities as described in any one of the above-mentioned methods, comprising: The permeability pressure value of the annular pile shell is monitored in real time by the monitoring components; The permeation pressure value detected by the monitoring component is compared with a preset permeation pressure threshold. When the permeation pressure value exceeds the preset permeation pressure threshold, it is determined that the pile body has damage cracks and an abnormal permeation pressure signal is generated. Based on the abnormal permeability pressure signal, the heating assembly is activated to heat the pile core; Heating by the heating component softens the pile core, causing it to flow and fill the damaged cracks in the pile body, thus sealing and self-healing.

[0014] According to the self-healing repair method for composite mixing piles provided by the present invention, the preset permeability pressure threshold is 110% of the standard permeability pressure value.

[0015] The present invention also provides a foundation reinforcement structure, which is formed by arranging multiple composite mixing piles with self-healing repair capabilities as described in any one of the above in a rectangular or quincunx pattern in a soft foundation, wherein the center distance between adjacent composite mixing piles is 1.8 to 2.2 meters, and the bottom of the composite mixing pile is embedded in the stable rock and soil layer to a depth of not less than 1.5 meters.

[0016] This invention provides a self-healing composite mixing pile, upgrading the traditional single-material mixing pile into a coaxial composite pile structure with an inner flexible and outer rigid structure. The coaxial composite pile consists of a flexible pile core at the center and a rigid annular pile shell surrounding it. The pile core is made of a material that solidifies at room temperature and softens into a fluid state upon heating, giving it both structural strength under normal conditions and fluid repair capability under activated conditions. The annular pile shell provides the main load-bearing strength and stability. The self-healing repair capability of the composite mixing pile relies on a self-healing repair system integrated into the pile body. This system uses monitoring components embedded in the annular pile shell to sense changes in seepage pressure in real time. Once the pile body develops cracks due to external loads or foundation deformation, leading to leakage, the seepage pressure becomes abnormal. At this time, the monitoring components send a signal, automatically triggering the heating components to start. The heating components heat the pile core, softening and fluidizing its core material, which, driven by seepage pressure, precisely fills the cracks, thereby achieving automatic crack sealing and self-restoration of structural function. This invention, by combining a rigid-flexible composite structure with a sensor-responsive repair system, fundamentally solves the contradiction that a single material cannot simultaneously meet the requirements of load-bearing capacity and deformation adaptability, enabling the pile to possess both high strength and good toughness. It also endows the pile with intelligent characteristics of self-diagnosis and self-healing of damage, transforming passive maintenance into active repair, and greatly improving the long-term durability and safety of the project. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the longitudinal section structure of the composite mixing pile with self-healing repair capability provided by the present invention.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the composite mixing pile with self-healing repair capability provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the layout structure of the foundation reinforcement structure provided by the present invention.

[0021] Figure 4 This is a construction drawing of a single composite mixing pile with self-healing repair capability in the foundation reinforcement structure provided by the present invention.

[0022] Reference numerals: 1. Pile core; 2. Annular pile shell; 3. Monitoring component; 4. Heating component. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] The following is combined with Figures 1 to 4 This invention describes a composite mixing pile with self-healing repair capability and its self-healing repair method.

[0027] One embodiment of the present invention provides a composite mixing pile with self-healing repair capability, combined with Figure 1 and Figure 2 As shown, the composite mixing pile with self-healing repair capability includes a coaxial composite pile body and a self-healing repair system. The coaxial composite pile body includes a pile core 1 located at the center and an annular pile shell 2 coaxially covering the outer periphery of the pile core 1. The pile core 1 is a flexible pile body, which is solidified at room temperature and softens and flows after heating. The annular pile shell 2 is a rigid pile body. The self-healing repair system includes a monitoring component 3 embedded in the annular pile shell 2 and a heating component 4 activated in response to feedback from the monitoring component 3. The monitoring component 3 is used to monitor the permeability pressure value of the annular pile shell 2, and the heating component 4 is used to heat the pile core 1 when it receives an abnormal permeability pressure signal from the monitoring component 3, so that the pile core 1 softens and flows.

[0028] It is understood that this self-healing composite mixing pile of this embodiment upgrades the traditional single-material mixing pile into a coaxial composite pile structure with a flexible inner core and a rigid outer core. The coaxial composite pile consists of a flexible pile core 1 at the center and a rigid annular pile shell 2 covering it. The pile core 1 is made of a material that solidifies at room temperature and softens into a fluid state after heating, giving it both structural strength under normal conditions and fluid repair capability under activated conditions. The annular pile shell 2 provides the main bearing strength and stability. The self-healing repair capability of the composite mixing pile relies on a self-healing repair system integrated into the pile body. The self-healing repair system uses a monitoring component 3 embedded in the annular pile shell 2 to sense changes in seepage pressure in real time. Once the pile body develops cracks due to external loads or foundation deformation, resulting in leakage, the seepage pressure becomes abnormal. At this time, the monitoring component 3 sends a signal to automatically trigger the heating component 4 to start. The heating component 4 heats the pile core, causing its core material to soften and flow. Driven by seepage pressure, it accurately fills the cracks, thereby achieving automatic sealing of cracks and self-recovery of structural function.

[0029] It is important to understand that this self-healing composite mixing pile, through the combination of a rigid-flexible composite structure (coaxial composite pile body) and a sensor-responsive repair system (self-healing repair system), fundamentally solves the contradiction that a single material cannot simultaneously achieve both load-bearing capacity and deformation adaptability. This gives the pile body both high strength and good toughness, and endows it with intelligent characteristics of self-diagnosis and self-healing of damage, transforming passive maintenance into active repair, greatly improving the long-term durability and safety of the project. The self-healing process of the composite mixing pile can be completed automatically by the system without manual intervention, effectively reducing the maintenance cost throughout its entire life cycle.

[0030] In some embodiments of the self-healing composite mixing pile of the present invention, the pile core 1 is an asphalt-soil mixing pile with a diameter of 0.8 to 1.2 meters; the annular pile shell 2 is a cement-soil mixing pile with a thickness of 0.2 to 0.3 meters; and the overall diameter of the coaxial composite pile body is 1.4 to 1.6 meters.

[0031] It is understood that in the coaxial composite pile structure of this embodiment, the inner pile core 1 is made of asphalt-soil mixture with a designed diameter of 0.8 to 1.2 meters (for example, 1 meter); the outer annular pile shell 2 is made of cement-soil mixture with a shell thickness of 0.2 to 0.3 meters (for example, 0.25 meters). Thus, the pile core 1 and the annular pile shell 2 together constitute a composite pile with an overall diameter between 1.4 and 1.6 meters (for example, 1.5 meters). In the implementation process, a central pile hole is first formed using specialized equipment and an asphalt-soil mixture is injected to construct the flexible pile core 1; after it has initially stabilized, the surrounding soil is mixed and cement grout is injected around the pile core 1 to form the rigid cement-soil annular pile shell 2 that is wrapped around it.

[0032] This embodiment ensures optimized synergy of "inner flexibility and outer rigidity" mechanical properties through precise dimensional proportions (e.g., a 1.0-meter pile core 1 paired with a 0.25-meter annular pile shell 2 to form a 1.5-meter integral pile). The cement-soil annular pile shell 2 provides the main rigidity and bearing capacity required by the pile body, effectively resisting external loads; while the inner asphalt-soil pile core 1 has excellent flexibility and deformation adaptability. The dimensional range of this embodiment allows the composite pile to maintain economical material usage while possessing a sufficient bearing cross-section, and its overall diameter is compatible with common construction equipment, ensuring construction feasibility and efficiency.

[0033] In some embodiments of the self-healing composite mixing pile of the present invention, the monitoring component 3 includes a piezometer, which is embedded in the annular pile shell 2 or on the outer circumferential surface of the annular pile shell 2. The monitoring component 3 includes multiple sets of piezometers, which are uniformly distributed along the circumference and axial direction of the annular pile shell 2.

[0034] It is understood that the self-healing composite mixing pile of this embodiment achieves its self-healing repair system monitoring and sensing capabilities through a distributed monitoring network. The core of the monitoring component 3 consists of multiple sets of high-precision piezometers, which are arranged within the rigid annular pile shell 2. In specific implementation, the piezometers can be pre-fixed to the reinforcing steel frame before pouring the cement-soil annular pile shell 2, ensuring a tight bond between the sensor end face and the pile shell material, or the piezometers can be embedded into the outer circumference of the already formed pile shell through subsequent drilling. These piezometers are not isolated but are uniformly and three-dimensionally arranged along both the circumferential (annular distribution) and axial (vertical distribution) dimensions of the annular pile shell 2, thereby forming a three-dimensional monitoring matrix within the pile body.

[0035] A distributed monitoring network formed by multiple piezometers enables comprehensive monitoring of the pile's health. Regardless of the height or location of the crack within the pile, any abnormal changes in seepage pressure caused by it can be sensitively detected by the nearest piezometer, ensuring timely and reliable monitoring. This networked layout not only triggers the repair mechanism but also allows all piezometers to be connected to an external processor for data processing. By comparing data from piezometers at different locations, the approximate location and severity of the damage can be preliminarily determined, providing richer information for system decision-making. The multiple piezometers in the networked layout constitute the pile's sensory nerves, accurately sensing the pile's own damage state. Each piezometer can be equipped with a corresponding heating component for subsequent targeted self-healing repair, fundamentally improving the accuracy and efficiency of the repair process.

[0036] In some embodiments of the self-healing composite mixing pile of the present invention, the heating component 4 includes heating rods disposed at the interface between the pile core 1 and the annular pile shell 2. The heating component 4 includes multiple heating rods, which are uniformly arranged around the pile core 1 circumferentially. The power of the heating rods is 5~8kW, and the operating temperature control range of the heating rods is 60~80℃, to ensure that the pile core 1 is fully softened and melted while avoiding aging or combustion.

[0037] It is understood that in this embodiment, the self-healing composite mixing pile utilizes a heating component to execute its self-healing repair system. This component uses high-power resistance heating rods as its core element. Multiple heating rods are precisely positioned at the interface between the flexible pile core 1 and the rigid annular pile shell 2, and are evenly arranged circumferentially around the pile core 1, forming a surrounding heating ring. During implementation, these heating rods are pre-embedded during the construction of the annular pile shell 2. Their power is set within the range of 5-8kW, and a precise temperature control system is provided to ensure that their operating temperature is strictly controlled within the optimized range of 60-80℃.

[0038] It is important to understand that placing the heating rods at the interface achieves the most direct and efficient heat conduction to the asphalt-soil pile core 1, ensuring that heat can be quickly and evenly transferred to the pile core body, thereby rapidly activating its flow potential when needed. The circumferentially uniform arrangement ensures that regardless of the direction of the crack within the pile, it receives balanced heat radiation, avoiding repair blind spots. The 5-8kW power and 60-80℃ temperature control range provide sufficient heat to fully soften and melt the asphalt-soil in the pile core 1 within a reasonable time, achieving a flowable state to seal the cracks, while simultaneously avoiding the risk of asphalt aging, performance degradation, or even combustion due to excessively high temperatures. This controlled heating mechanism in this embodiment ensures that the self-healing process is safe, reliable, and repeatable, thus precisely achieving the function of on-demand repair without causing secondary damage to the pile body.

[0039] In another aspect, the present invention provides a self-healing repair method for composite mixing piles, applicable to composite mixing piles with self-healing repair capability in any of the above embodiments or examples. The self-healing repair method for composite mixing piles includes the following steps S1 to S4.

[0040] S1. The permeation pressure value of the annular pile shell 2 is monitored in real time by the monitoring component 3; S2. Compare the permeation pressure value monitored by the monitoring component 3 with the preset permeation pressure threshold. When the permeation pressure value exceeds the preset permeation pressure threshold, it is determined that the pile body has damage cracks and an abnormal permeation pressure signal is generated. S3. Based on the abnormal seepage pressure signal, start the heating component 4 to heat the pile core 1; S4. Based on the heating of the heating component 4, the pile core 1 is softened and flows, filling the damaged cracks in the pile body to seal and self-heal.

[0041] This embodiment of the self-healing repair method for composite mixing piles realizes an intelligent response process from perception and diagnosis to active repair. The system continuously collects seepage pressure data of the annular pile shell 2 through pre-embedded monitoring components 3 and automatically compares it with a preset safety threshold (a preset seepage pressure threshold, for example, 110% of the standard value). Once the monitoring data continuously exceeds the safety threshold, the system determines that the pile body has cracked and leaked, and automatically generates a control signal. This signal immediately triggers the heating components 4 arranged around the pile core 1 to start, locally heating the asphalt soil pile core 1 inside, softening and melting it into a fluid state at a controlled temperature of 60~80℃. Finally, driven by external seepage pressure and the synergistic effect of the material's own fluidity, the molten asphalt soil will precisely flow to and completely fill the crack area, achieving self-sealing and functional restoration of the structure.

[0042] The self-healing repair method of this composite mixing pile in this embodiment transforms the traditional passive and intermittent manual maintenance into an active and continuous structural self-maintenance. It can not only achieve rapid response and eradication in the early stage of water leakage, greatly improving the long-term seepage prevention reliability and durability of the project, but also realize fully automated operation, significantly reducing the operation and maintenance cost and human intervention risk throughout the entire life cycle.

[0043] The preset threshold mechanism in this embodiment (the preset seepage pressure threshold is 110% of the standard seepage pressure value) ensures that the system only activates when damage actually occurs, avoiding energy waste caused by false triggering and demonstrating its accuracy and economy. Furthermore, this self-healing repair method for composite mixing piles in this embodiment can be deeply integrated with IoT technology to achieve remote status monitoring and big data analysis, providing predictive maintenance capabilities for the entire foundation reinforcement system, thereby improving the intelligent management level of foundation engineering.

[0044] In another aspect, the present invention also provides a foundation reinforcement structure, combined with Figure 3 and Figure 4 As shown, the foundation reinforcement structure is formed by multiple composite mixing piles with self-healing repair capabilities as described in any of the above embodiments or examples, arranged in a rectangular or quincunx pattern in the soft foundation. The center-to-center distance between adjacent composite mixing piles is 1.8 to 2.2 meters, and the bottom of the composite mixing pile is embedded in the stable rock and soil layer to a depth of not less than 1.5 meters.

[0045] It is understood that the foundation reinforcement structure constructed in this embodiment uses multiple composite mixing piles with self-healing repair capabilities as basic units, systematically deployed in soft foundations. In specific implementation, these composite mixing piles are precisely arranged in a rectangular or quincunx array pattern, with the center-to-center distance between adjacent piles controlled within the optimal range of 1.8 to 2.2 meters. During construction, it is ensured that the piles penetrate the weak silt layer, and their bottoms are firmly embedded in the underlying stable soil and rock layer to a depth of not less than 1.5 meters, thus forming a comprehensive reinforcement system that reaches the bearing layer and has a closed planar shape.

[0046] It's important to understand that the rectangular or quincunx-shaped pile arrangement ensures uniform stress distribution within the reinforced area, eliminating weak points. The piles work together to bear the load, forming a robust composite foundation. A pile spacing of 1.8 to 2.2 meters ensures both bearing capacity and impermeability while maximizing material efficiency. Furthermore, embedding the piles at least 1.5 meters into the stable soil layer acts like anchors, significantly enhancing the structure's resistance to sliding and overturning, thus guaranteeing the long-term stability of the entire project.

[0047] The foundation reinforcement structure constructed in this embodiment integrates the "individual intelligence" of a single mixing pile into the "collective intelligence" of the entire reinforcement system. When any pile in the system triggers a self-healing mechanism due to local stress, it not only repairs itself but also maintains the integrity of the overall anti-seepage curtain. This makes the foundation reinforcement structure not just a passive load-bearing system, but also an intelligent integrated system that can sense internal damage and perform autonomous maintenance. It is particularly suitable for major projects such as water conservancy cofferdams and slope protection, which have extremely high requirements for long-term stability and safety. It realizes the leap from static reinforcement to dynamic self-adaptation in foundation treatment technology.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite mixing pile with self-healing repair capability, characterized in that, include: The coaxial composite pile body includes a pile core (1) located at the center and an annular pile shell (2) coaxially covering the outer periphery of the pile core (1). The pile core (1) is a flexible pile body, which is solidified at room temperature and softens and flows after heating. The annular pile shell (2) is a rigid pile body. The self-healing repair system includes a monitoring component (3) embedded in the annular pile shell (2) and a heating component (4) activated in response to feedback from the monitoring component (3). The monitoring component (3) is used to monitor the permeation pressure value of the annular pile shell (2), and the heating component (4) is used to heat the pile core (1) when it receives the permeation pressure abnormal signal from the monitoring component (3), so that the pile core (1) exhibits a softening flow dynamic.

2. The composite mixing pile with self-healing repair capability according to claim 1, characterized in that, The pile core (1) is an asphalt-soil mixing pile with a diameter of 0.8 to 1.2 meters; the ring-shaped pile shell (2) is a cement-soil mixing pile with a thickness of 0.2 to 0.3 meters; the overall diameter of the coaxial composite pile body is 1.4 to 1.6 meters.

3. The composite mixing pile with self-healing repair capability according to claim 1, characterized in that, The monitoring component (3) includes a piezometer, which is embedded in the annular pile shell (2) or on the outer circumference of the annular pile shell (2).

4. The composite mixing pile with self-healing repair capability according to claim 3, characterized in that, The monitoring component (3) includes multiple sets of the piezometers, which are evenly distributed along the circumference and axial direction of the annular pile shell (2).

5. The composite mixing pile with self-healing repair capability according to claim 1, characterized in that, The heating component (4) includes a heating rod, which is disposed at the interface between the pile core (1) and the annular pile shell (2).

6. The composite mixing pile with self-healing repair capability according to claim 5, characterized in that, The heating assembly (4) includes a plurality of heating rods, which are evenly arranged around the pile core (1) in a circumferential manner.

7. The composite mixing pile with self-healing repair capability according to claim 5, characterized in that, The power of the heating rod is 5~8kW, and the working temperature control range of the heating rod is 60~80℃, so as to ensure that the pile core (1) is fully softened and melted while avoiding aging or burning.

8. A self-healing repair method for composite mixing piles, characterized in that, The composite mixing pile with self-healing repair capability as described in any one of claims 1 to 7 includes: The permeation pressure value of the annular pile shell (2) is monitored in real time by the monitoring component (3); The permeation pressure value monitored by the monitoring component (3) is compared with the preset permeation pressure threshold. When the permeation pressure value exceeds the preset permeation pressure threshold, it is determined that the pile body has damage cracks and an abnormal permeation pressure signal is generated. Based on the abnormal permeation pressure signal, the heating assembly (4) is activated to heat the pile core (1); Heating by the heating component (4) causes the pile core (1) to soften and flow, filling the damaged cracks in the pile body for sealing and self-healing repair.

9. The self-healing repair method for composite mixing piles according to claim 8, characterized in that, The preset osmotic pressure threshold is 110% of the standard osmotic pressure value.

10. A foundation reinforcement structure, characterized in that, The composite mixing piles with self-healing repair capabilities as described in any one of claims 1 to 7 are arranged in a rectangular or quincunx pattern in a soft foundation. The center-to-center distance between adjacent composite mixing piles is 1.8 to 2.2 meters, and the bottom of the composite mixing pile is embedded in the stable rock and soil layer to a depth of not less than 1.5 meters.

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