A pile foundation monitoring method and system based on GPR+ digital geology

Abstract

This invention discloses a pile foundation monitoring method and system based on GPR and digital geology, belonging to the field of building foundation engineering safety monitoring technology. It includes: a GPR system, a digital geology system, a BIM model system, a data calculation and early warning system, and a mobile early warning receiving system. The digital geology system combines wave signal information and geological exploration borehole data to establish a three-dimensional geological model. A three-dimensional pile foundation model is established through the BIM model system, which is combined with the three-dimensional geological model to form a three-dimensional information model of the underground engineering. The information of the three-dimensional information model of the underground engineering is uploaded to the data calculation and early warning system for model hazard level determination. At this time, the data calculation and early warning system calculates whether the model exceeds the defined hazard boundary conditions, achieving visualized, all-weather, fully automatic, high-precision, and low-cost pile foundation monitoring, effectively preventing sudden pile foundation failure that could cause equipment damage, personnel casualties, and affect the safety of surrounding buildings.

Description

Technical Field

[0001] This invention relates to the field of safety monitoring technology for building foundation engineering, and more specifically to a pile foundation monitoring method and system based on GPR+ digital geology. Background Technology

[0002] Currently, during the foundation construction of building projects, adverse geological conditions and complex terrain are frequently encountered. To ensure the stability of the superstructure, the foundation must provide sufficient bearing capacity. Pile foundations are a commonly used foundation type in engineering. They are deep foundations where individual piles are connected into a whole by a pile cap to jointly bear the load from the superstructure. As vertical or inclined foundation components buried in the soil, piles work by penetrating soft, highly compressible soil layers or water to transfer the load borne by the pile to a harder, denser, or less compressible bearing layer. In engineering, the piles in a pile foundation are called foundation piles. Foundation piles must not only bear longitudinal loads but also have the ability to withstand horizontal shear loads. Therefore, the bearing capacity of the foundation piles determines the stability of the superstructure. Pile foundation monitoring is crucial for obtaining information on pile displacement, deformation, and temperature and humidity changes. The shape, size, and displacement of piles reflect the severity of foundation damage. However, due to the high degree of concealment and suddenness of damage, it is often a technical challenge in the field of foundation engineering monitoring. How to conduct real-time, accurate, multi-dimensional, and non-destructive monitoring of pile foundations is an urgent problem to be solved in pile foundation monitoring.

[0003] Traditional pile foundation monitoring technology can reflect the characteristics of foundation deformation to a certain extent, but it cannot achieve satisfactory results due to the influence of geological environment, human factors, and external interference. Current monitoring technologies mainly suffer from the following problems: 1. According to the "Technical Specification for Testing of Building Foundation Piles" JGJ106-2014, pile testing methods such as static load testing, core drilling, and high-strain methods involve a large number of people, have complex testing procedures, and are time-consuming and labor-intensive. 2. Monitoring methods are mainly manual, failing to achieve all-weather real-time monitoring. 3. The performance and deformation displacement parameters of the piles can only be tested during construction or after construction, lacking monitoring throughout the entire life cycle after completion. 4. There is a lack of visual imaging capabilities, failing to intuitively reflect the deformation and displacement of the piles. 5. The interaction between the piles and the foundation is not fully considered, and the early warning of pile hazards is not timely enough.

[0004] Benefiting from the rapid development of technologies such as intelligent monitoring and digital geology, new digital and information-based detection technologies and equipment are constantly emerging, bringing broader technological application space to foundation engineering monitoring. Among them, Impulse Ground Penetrating Radar (GPR), as a non-destructive detection system, has advantages such as real-time performance, multi-dimensionality, and high precision, and can accurately and quickly monitor changes in pile displacement, deformation, and load. Digital geology technology, as a digital carrier of underground hidden engineering, can accurately locate the key deformation positions of underground engineering bodies. Previous technologies have their own advantages in monitoring deformation of hidden engineering bodies, but because the monitoring of underground engineering bodies is a systematic project, it has high requirements for continuity, real-time performance, and reliability. Traditional single monitoring technologies cannot meet these requirements and lack visualization effects. Therefore, digital fusion and information cross-linking technologies are needed to solve these problems. This patent adopts a combination of GPR and digital geology technologies, which can accurately locate key nodes of deformation, accurately identify the deformation characteristics of hidden engineering bodies, accurately describe displacement changes, and provide visualization imaging effects, which will effectively improve the quality and level of pile foundation monitoring. Summary of the Invention

[0005] In view of this, the present invention provides a pile foundation monitoring method and system based on GPR+ digital geology, which enables real-time, accurate, multi-dimensional, and non-destructive monitoring of pile foundations. To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pile foundation monitoring method based on GPR+digital geology includes: a GPR system, a digital geology system, a BIM model system, a data calculation and early warning system, and a mobile early warning receiving system;

[0007] A GPR system is established based on a pulse radar detection system and a radar detection information processing and storage system.

[0008] The pulse radar detection system detects wave signals, and the radar detection information processing and storage system receives and stores the wave signals, processes them, and uploads them to the digital geological system.

[0009] A three-dimensional geological model is established based on the digital geological system, combined with wave signal information and geological exploration borehole data; a three-dimensional pile foundation model is established through the BIM model system, and combined with the three-dimensional geological model to form a three-dimensional information model of underground engineering.

[0010] The three-dimensional information model of the underground project is uploaded to the data calculation and early warning system to determine the model's hazard level. The calculation results are uploaded to the mobile early warning receiving system in real time.

[0011] Optionally, the specific steps for establishing the GPR system are as follows:

[0012] Step 2.1: Pre-embed resistors in the pile body and around the pile, and arrange pulse radar on the ground. The pulse radar is arranged in a mesh structure based on the horizontal position of the pile. The resistors are arranged in a divergent structure around the pile with the pile as the center.

[0013] Step 2.2: The pulse source of the pulse radar deployed on the ground emits a detection wave into the ground through the transmitting antenna. After being reflected by the resistor, the reflected wave information is transmitted to the receiving antenna.

[0014] Step 2.3: The radar detection information processing and storage system receives the wave signal from the receiving antenna, converts it into a digital signal, processes the digital signal to form digital information, and stores it.

[0015] Step 2.4: Process the generated digital information. Part of it is uploaded to the digital geology system to create a three-dimensional geological model in conjunction with geological exploration data; the other part is input into the BIM model system to represent the information represented by the wave signals in the model.

[0016] Optionally, the specific steps for establishing the digital geological system are as follows:

[0017] Step 3.1: Based on the borehole data from the geological survey report for the construction project, use CIVIL3D software to create a preliminary three-dimensional geological model;

[0018] Step 3.2: Based on the wave signal information provided by the pulse radar detection system, optimize and render the primary three-dimensional geological model to form a more accurate and realistic three-dimensional geological model;

[0019] Step 3.3: Upload the resulting 3D geological model to the system cloud.

[0020] Optionally, the specific steps for establishing the BIM model system are as follows:

[0021] Step 4.1: Based on the pile foundation design drawings, use Revit software to create a three-dimensional system model of the pile foundation to obtain a three-dimensional pile foundation model;

[0022] Step 4.2: The BIM model system integrates the 3D geological model and the 3D pile foundation model to form a 3D information model of the underground engineering.

[0023] Step 4.3: The BIM model system receives wave signal information from the radar detection information processing and storage system, automatically processes and generates data, and intuitively reflects it in the three-dimensional information model of the underground engineering in a three-dimensional form.

[0024] Optionally, the wave signal information may be geological soil layer information and pile displacement, deformation, temperature and humidity information in the form of wave signals.

[0025] Optionally, the BIM system, GPR system, and digital geological system are connected and shared wirelessly, and the data is uploaded to the system cloud.

[0026] Optionally, the resistor has a temperature and humidity monitoring function, changing its resistance value by sensing the surrounding temperature and humidity, and reflecting different echoes under different temperature and humidity conditions. Optionally, the radar detection information processing and storage system receives pile displacement, deformation, temperature, and humidity information in the form of wave signals, amplifies and converts it into digital information, and then uploads it to the complete 3D model, where it is visually reflected. The complete model information is uploaded to the data calculation and early warning system for model hazard level determination, and the calculation results are uploaded in real time to the mobile early warning receiving system, providing intuitive and accurate data support for staff to take corresponding remedial measures.

[0027] Optionally, a large number of pulse radar instruments with multiple transmission frequencies can be installed at fixed locations on the ground, such as the SIR series from Geophysical Survey Systems, Inc. (USA), the EKKO series from Sensors & Software Inc. (Canada), and the RAMAC series from MALA (Sweden); multiple resistors with different resistances (e.g., ...) can be installed in the pile and the surrounding soil. Figure 2 To ensure the accuracy of ground-penetrating radar monitoring as much as possible.

[0028] Optionally, the pulse radar instrument can be deployed on the ground using a mesh structure based on the horizontal position of the foundation piles, as shown in the mesh structure arrangement below. Figure 1 As shown; the resistors are arranged in a radial pattern radiating from the foundation piles as the center, as shown in the diagram. Figure 2 .

[0029] Optionally, BIM systems, GPR systems, and digital geological systems all have wireless data transmission capabilities, and they are interconnected, share data, and upload data to the cloud of BIM systems, digital geological systems, and data verification and early warning systems.

[0030] Optionally, the pulse radar detection system and radar detection information processing and storage system have independent battery modules, which can still perform comprehensive real-time monitoring for 14 days when there is no AC power.

[0031] Optionally, the center frequency of the pulse radar system can be selected as 100MHz. This frequency takes into account the three factors of ranging, resolution and system portability, and has a good effect.

[0032] Optionally, the BIM model system, digital geology system, data calculation and early warning system have terminal data storage in the cloud, and engineering data information can be stored in the cloud for reference in other projects.

[0033] Optionally, the data verification and early warning system can be configured with multi-dimensional and multi-level model hazard boundary conditions.

[0034] Optionally, a pile foundation monitoring system based on GPR+ digital geology includes:

[0035] System construction module: Establishing a GPR system based on a pulse radar detection system and a radar detection information processing and storage system;

[0036] Data acquisition module: The pulse radar detection system detects wave signals, and the radar detection information processing and storage system receives and stores the wave signals, processes them, and uploads them to the digital geological system.

[0037] Model building module: Based on the digital geological system, a three-dimensional geological model is established by combining wave signal information and geological exploration borehole data; a three-dimensional pile foundation model is established through the BIM model system, and combined with the three-dimensional geological model to form a three-dimensional information model of underground engineering;

[0038] Hazard assessment module: Uploads the 3D information model of the underground project to the data calculation and early warning system to determine the hazard level of the model, and uploads the calculation results to the mobile early warning receiving system in real time.

[0039] As can be seen from the above technical solution, compared with the prior art, this invention discloses a pile foundation monitoring method and system based on GPR + digital geology. It combines a GPR system with a digital geological system, accurately identifying key nodes of the pile foundation through a ground-penetrating radar detection system and geological data carrier. By arranging resistors around the pile foundation and pulse radar instruments on the ground, a GPR system is formed, and the detection information is wirelessly transmitted in digital form to the digital geological system and the BIM model system. The data is used to correct and render the three-dimensional geological model and to visually display the deformation, displacement, and temperature and humidity changes of the pile foundation. At this time, the data verification and early warning system calculates whether the model exceeds the defined dangerous boundary conditions. By sending early warnings to a mobile early warning receiving system in advance, it achieves visualized, all-weather, fully automatic, high-precision, and low-cost pile foundation monitoring, effectively preventing sudden pile foundation failures that could cause equipment damage, casualties, or impact on the safety of surrounding buildings. Furthermore, it continuously uploads engineering monitoring information to a cloud storage system in real time, providing data reference for other pile foundation monitoring projects. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0041] Figure 1 A mesh structure based on the horizontal position of the foundation piles was adopted for the ground layout of the pulse radar instrument;

[0042] Figure 2 It is a divergent structure consisting of underground piles and pile-circumferential resistors surrounding the foundation piles;

[0043] Figure 3 This is a system layout diagram of a pile foundation monitoring method and system based on GPR+ digital geology;

[0044] Figure 4 A flowchart illustrating a pile foundation monitoring method and system based on GPR and digital geology.

[0045] Among them, 1. foundation pile, 2. pulse radar, and 3. resistor. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] This invention discloses a pile foundation monitoring method and system based on GPR+ digital geology, such as... Figure 3 As shown, it includes: a GPR system, a digital geological system, a BIM model system, a data calculation and early warning system, and a mobile early warning receiving system; the GPR system includes a pulse radar detection system and a radar detection information processing and storage system.

[0048] The pulse radar detection system detects geological soil layer information and pile displacement and deformation information. The geological soil layer information is input into the radar detection information processing and storage system in the form of wave signals. After being amplified and converted into digital information, the digital information is uploaded to the digital geology system. The system combines the geological exploration data to establish a three-dimensional geological model. Similarly, the pile displacement and deformation, temperature and humidity information are input into the BIM model system, and the deformation displacement, temperature and humidity information of pile 1 are intuitively reflected in the model. The BIM model system integrates geological and pile foundation models to form a complete three-dimensional information model of underground engineering. The complete model information is uploaded to the data calculation and early warning system to determine the model's hazard level. The calculation results are uploaded to the mobile early warning receiving system in real time. The mobile early warning receiving system is used to receive the hazard judgment signals from the data calculation and early warning system. It provides intuitive and accurate data support for staff to take corresponding remedial measures, such as the direction and distance of pile displacement, the deformation mode and magnitude of pile deformation, the changes in temperature and humidity around the pile, and the direction and distance of soil displacement around the pile. Considering the interaction between pile 1 and the foundation, the impact of the soil displacement around the pile on pile 1 can be predicted in advance, playing an early warning role in pile foundation monitoring.

[0049] Furthermore, the GPR system includes the following:

[0050] (1) Pre-embed resistor 3 in the pile and surrounding soil. Arrange five layers of resistors on the pile body, including one layer at the top and one layer at the bottom. Arrange the resistors 3 in the surrounding soil in a radiating structure with the pile as the center. The radius of each outward radiating circle increases exponentially. See the specific arrangement for details. Figure 2 .

[0051] (2) Position pulse radar 2 on the ground above the pile in a grid pattern, ensuring that the radar at the grid intersection is directly above the pile. Arrange the remaining eight detection radars around it in a grid pattern. See [link to specific arrangement details] for details. Figure 1 .

[0052] (3) The transmitter of the pulse radar detection system converts the DC power supplied by the DC power supply into a high-frequency, narrow-pulse AC signal, and transmits electromagnetic waves of a fixed frequency to the medium being detected through the transmitting antenna, and the medium being detected reflects the echo.

[0053] (4) The receiving antenna of the detection information processing and storage system receives the wave signal and inputs it into the receiver, where it is amplified and converted into a digital signal. The signal is then transmitted to the control unit for superposition, calculation, and storage.

[0054] (5) The processed information is divided into geological information and pile deformation displacement, temperature and humidity change information. The geological information is wirelessly transmitted to the digital geological system to correct and render the geological model; the pile deformation displacement, temperature and humidity change information is wirelessly transmitted to the three-dimensional pile model system to intuitively reflect the changes of pile 1 and the pile periphery in the model in a three-dimensional form.

[0055] Furthermore, the digital geological system includes the following:

[0056] (1) The digital geological system converts geological exploration borehole data into a CSV table file, which is then imported into CIVIL3D software for preliminary three-dimensional geological modeling.

[0057] (2) Based on the geological information sent by the detection information processing and storage system, the three-dimensional geological model is corrected and converted into Revit format. Revit is then used to render the model to form a more accurate and realistic geological model.

[0058] Furthermore, the BIM model system includes the following:

[0059] (1) BIM model system: Based on the pile foundation design drawings provided by the design institute, Revit is used to perform three-dimensional modeling of the pile foundation. The BIM model system integrates the geological and pile foundation models to form a complete three-dimensional model.

[0060] (2) Based on the pile foundation deformation displacement and temperature and humidity change information sent by the detection information processing and storage system, the information is automatically and intuitively reflected on the three-dimensional model so that staff can intuitively observe the changes of the pile foundation in the three-dimensional model.

[0061] (3) Based on national standards and actual engineering requirements, three levels of hazard warning boundary conditions are set in the model.

[0062] Furthermore, in a specific embodiment, the monitoring method of the pile foundation monitoring method and system based on GPR+ digital geology includes the following: Figure 4 As shown;

[0063] (1) The pulse radar detection system detects geological soil layer information and pile displacement deformation, temperature and humidity information.

[0064] (2) Geological soil layer information is input into the radar detection information processing and storage system in the form of wave signals. After being amplified and converted into digital information, the digital information is uploaded to the digital geological system. The system combines the geological exploration data to establish a three-dimensional geological model.

[0065] (3) The BIM model system integrates geological and pile foundation models to form a complete three-dimensional information model of underground engineering.

[0066] (4) Input the pile displacement and deformation information into the BIM model system to intuitively reflect the deformation displacement, temperature and humidity information of pile 1 in the model.

[0067] (5) Upload the complete model information to the data verification and early warning system to determine the model risk level. The verification results are transmitted to the mobile early warning receiving system in real time and the data is uploaded to the cloud.

[0068] (6) The mobile terminal early warning receiving system is used to receive data verification and early warning system danger judgment signals, providing intuitive and accurate data support for staff to take corresponding management measures.

[0069] Furthermore, a pile foundation monitoring system based on GPR+ digital geology includes:

[0070] System construction module: Establishing a GPR system based on a pulse radar detection system and a radar detection information processing and storage system;

[0071] Data acquisition module: The pulse radar detection system detects wave signals, and the radar detection information processing and storage system receives and stores the wave signals, processes them, and uploads them to the digital geological system.

[0072] Model building module: Based on the digital geological system, a three-dimensional geological model is established by combining wave signal information and geological exploration borehole data; a three-dimensional pile foundation model is established through the BIM model system, and combined with the three-dimensional geological model to form a three-dimensional information model of underground engineering;

[0073] Hazard assessment module: Uploads the 3D information model of the underground project to the data calculation and early warning system to determine the hazard level of the model, and uploads the calculation results to the mobile early warning receiving system in real time.

[0074] Furthermore, in a specific embodiment, the pulse radar detection system of the GPR system possesses sufficient penetration and resolution. The penetration depth of electromagnetic waves mainly depends on the frequency, energy level, and conductivity of the conductive medium. As the water content and temperature around the pile increase, the temperature and humidity rise, increasing the conductivity of the temperature and humidity resistors and thus increasing the attenuation rate of the radar waves. As the frequency of electromagnetic waves increases, their penetration depth decreases; however, decreasing the frequency or increasing the wavelength λ reduces the resolution. To distinguish the target from the background, the target size should be proportional to the wavelength, i.e., λ / 4. The ability to distinguish different resistors also depends on the type and size of the resistors and their conductivity characteristics. The greater the difference in conductivity characteristics between resistors, the easier it is to monitor them; therefore, various types and values ​​of resistors are selected for the system. Experience from many geological environments shows that a radar system with a center frequency of approximately 100MHz balances ranging, resolution, and system portability, resulting in good performance; therefore, this system uses a 100MHz radar.

[0075] Furthermore, in a specific embodiment, the digital geological system, BIM model system, and data calculation and early warning system are cloud-based. The digital geological system performs geological modeling and stores the three-dimensional geological model in the cloud, gradually forming a digital geological model with an increasingly larger scope. The BIM model system integrates the three-dimensional model and intuitively reflects the pile deformation displacement and temperature and humidity change information received from the GPR system in the model. The data calculation and early warning system performs calculations on the model, and the calculation process and results are uploaded to the cloud to check whether the calculation exceeds the three established danger boundaries. If any danger boundary is exceeded, the danger information and detailed displacement deformation and temperature and humidity change data are transmitted to the mobile early warning receiving system.

[0076] Furthermore, in a specific embodiment, since temperature and humidity changes in the pile foundation and its surrounding area are also important factors that management personnel need to monitor accurately and promptly, this embodiment utilizes a radar-based temperature and humidity resistor for pile foundation monitoring. This resistor can detect real-time temperature and humidity changes in the pile body and its surrounding area. The resistor's resistivity changes according to the magnitude of temperature and humidity. The resistor transmits echo signals to a receiving antenna, and the information processing and storage system then sends the temperature and humidity change information to the BIM model system. The BIM model system then transmits the temperature and humidity information to a data calculation and early warning system to determine if the danger boundary has been exceeded. If the boundary is exceeded, an early warning message and specific data are transmitted to a mobile early warning receiving system. Management personnel can monitor the temperature and humidity changes around the pile foundation and their impact on the pile foundation in real time.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0078] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pile foundation monitoring method based on GPR+ digital geology, characterized in that, The application relates to a GPR system, a digital geological system, a BIM model system, a data checking and early warning system and a mobile terminal early warning receiving system. The GPR system is established based on a pulse radar detection system and a radar detection information processing and storage system. The specific steps for establishing the GPR system are as follows: Step 2.1: A resistor (3) is embedded in a pile body and around the pile, and a pulse radar (2) is arranged on the ground; the pulse radar (2) is arranged on the ground in a net structure based on the horizontal position of a pile (1); The resistor (3) is arranged in a divergent structure around the pile (1) as a center; Step 2.2: A pulse source of the pulse radar (2) arranged on the ground emits a detection wave to the underground by using a transmitting antenna, the detection wave is reflected by the resistor (3), and the reflected wave information is transmitted to a receiving antenna; Step 2.3: A radar detection information processing and storage system receives the wave signal from the receiving antenna, converts the wave signal into a digital signal, processes the digital signal to form digital information and stores the digital information; Step 2.4: The digital information is processed, a part of the digital information is uploaded to a digital geological system to establish a three-dimensional geological model in combination with geological exploration data, and the other part of the digital information is input into a BIM model system to represent the information represented by the wave signal in the model; The pulse radar detection system detects the wave signal, the radar detection information processing and storage system receives and stores the wave signal, and the wave signal is processed and uploaded to the digital geological system; the wave signal information is geological stratum information and pile displacement, deformation, temperature and humidity information in the form of the wave signal; The digital geological system establishes a three-dimensional geological model in combination with the wave signal information and geological exploration drilling data; a three-dimensional pile foundation model is established by the BIM model system, and the three-dimensional pile foundation model is combined with the three-dimensional geological model to form a three-dimensional information model of an underground project; The three-dimensional information model of the underground project is uploaded to a data checking and early warning system to determine the model danger level, and the checking result is uploaded to a mobile terminal early warning receiving system in real time. The specific establishment steps of the digital geological system are as follows:

2. The pile foundation monitoring method based on GPR+ digital geology according to claim 1, characterized in that, Step 3.1: According to drilling data information in a building engineering geological exploration report, a three-dimensional geological model is formed by using CIVIL 3D software geological modeling; Step 3.2: According to the wave signal information provided by the pulse radar detection system, the three-dimensional geological model is optimized and rendered to form a more accurate and real three-dimensional geological model; Step 3.3: The formed three-dimensional geological model is uploaded to a system cloud. The specific establishment steps of the BIM model system are as follows:

3. The pile foundation monitoring method based on GPR+ digital geology of claim 1, wherein, Step 4.1: According to a pile foundation design drawing, a three-dimensional pile foundation model is obtained by using Revit software to perform three-dimensional system modeling on the pile foundation; Step 4.2: The BIM model system integrates the three-dimensional geological model and the three-dimensional pile foundation model to form a three-dimensional information model of an underground project; Step 4.3: The BIM model system receives the wave signal information from the radar detection information processing and storage system, automatically processes the data and directly displays the data in the three-dimensional information model of the underground project in a three-dimensional form. The BIM system, the GPR system and the digital geological system are connected by wireless data, share data and upload the data to a system cloud.

4. The pile foundation monitoring method based on GPR+ digital geology of claim 1, wherein, ​ 5. The GPR+ digital geology-based pile foundation monitoring method according to claim 1, characterized in that, The resistor (3) has a temperature and humidity monitoring function, changes its resistance value by sensing the temperature and humidity around it, and reflects different echoes under different temperature and humidity.

6. The pile foundation monitoring method based on GPR+ digital geology of claim 1, wherein, The center frequency of the pulse radar detection system is selected as 100MHz.

7. A pile foundation monitoring system based on GPR+ digital geology, characterized in that, The method comprises the following steps: The system construction module is used to establish a GPR system based on the pulse radar detection system and the radar detection information processing and storage system. The specific steps of establishing the GPR system are as follows: Step 2.1: The resistor (3) is embedded in the pile body and around the pile, and the pulse radar (2) is arranged on the ground in a net structure based on the horizontal position of the pile (1). The resistor (3) is arranged in a divergent structure around the pile (1) with the pile (1) as the center. Step 2.2: The pulse source of the pulse radar (2) arranged on the ground emits a detection wave to the underground by using the transmitting antenna, the reflected wave information is transmitted to the receiving antenna through the resistor (3); Step 2.3: The radar detection information processing and storage system receives the wave signal from the receiving antenna, converts it into a digital signal, calculates and processes the digital signal to form a digital information and stores it; Step 2.4: The digital information is processed to form a part of the digital information uploaded to the digital geological system to establish a three-dimensional geological model in combination with the geological exploration data; another part of the digital information is input into the BIM model system to represent the information represented by the wave signal in the model; The data acquisition module is used to detect the wave signal by the pulse radar detection system, receive and store the wave signal by the radar detection information processing and storage system, and process and upload the wave signal to the digital geological system; the wave signal information is geological soil layer information and pile displacement, deformation, temperature and humidity information in the form of wave signal; The model construction module is used to establish a three-dimensional geological model based on the digital geological system in combination with the wave signal information and the geological exploration drilling data; a three-dimensional pile foundation model is established by the BIM model system, and a three-dimensional information model of underground engineering is formed in combination with the three-dimensional geological model; The hazard determination module is used to upload the information of the three-dimensional information model of underground engineering to the data calculation and early warning system to determine the model hazard level, and the calculation result is uploaded to the mobile terminal early warning receiving system in real time.

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