Intelligent feedback method for dynamic regulation and control of frozen soil crossing circle

Abstract

The invention relates to the field of artificial frozen walls, in particular to an intelligent feedback method for dynamic regulation and control of frozen soil circulation. Providing an ultrasonic sensor, regularly transmitting ultrasonic waves to the frozen soil area, and receiving the ultrasonic waves to obtain waveform data of the ultrasonic waves when the ultrasonic waves are propagated in the frozen soil area; the waveform data are analyzed and calculated, and the propagation velocity v of the ultrasonic waves in the frozen soil area is obtained; calculating the elastic modulus Ed of the frozen soil area and the change rate of the elastic modulus Ed based on the propagation velocity v of the ultrasonic wave in the frozen soil area; setting a minimum change rate limit value, comparing the change rate of the elastic modulus Ed with the minimum change rate limit value Kmin, and when the change rate of the elastic modulus Ed is smaller than the minimum change rate limit value Kmin, reducing the temperature of the refrigerant in the freezing pipe and increasing the flow of the refrigerant in the freezing pipe until the change rate of the elastic modulus Ed is larger than or equal to the minimum change rate limit value Kmin, the best freezing effect is achieved; meanwhile, based on the elastic modulus Ed, whether freezing of the frozen soil area is completed or not is judged. The method has the beneficial effects that the propagation velocity of ultrasonic waves in the frozen soil area is detected through the ultrasonic sensor, the elastic modulus of the frozen soil area is calculated through the propagation velocity, whether the frozen soil area reaches the freezing standard or not is judged, and whether the frozen soil area intersects or not is judged. The method does not depend on a temperature sensor and manual inspection, and the accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of artificial frozen walls, and in particular to an intelligent feedback method for dynamic regulation of frozen soil circles. Background Art

[0002] Freeze-line construction involves drilling holes into an aquifer, inserting steel pipes, and circulating liquid nitrogen to freeze the surrounding ground, forming a hard frozen crust. This not only ensures ground stability but also acts as a water barrier, enabling deep excavation. Frozen wall intersection refers to the phenomenon during mine freezing construction where frozen columns in adjacent freezing holes gradually expand and connect to form a closed cylindrical frozen wall. This formation is determined by a seven-day rise in the water level or water bubbling in the hydrological observation hole. It is a prerequisite for safe trial excavation of the frozen shaft.

[0003] Existing permafrost monitoring mainly relies on temperature sensors (such as thermocouples) and manual inspections, which makes it difficult to quantify changes in the mechanical state of frozen soil in real time, resulting in delayed regulation. For example, traditional methods require more than 70% of the permafrost ring to be completed before significant temperature changes can be detected, delaying the optimal timing for regulation. Frost heave force has nonlinear mutations (such as a 90% increase in frost heave force when the ring is closed), and existing technologies cannot provide early warning. Regulation relies on empirical parameters (such as fixed refrigerant flow), and it is impossible to dynamically adjust refrigerant parameters according to the actual strength of the permafrost, which can easily lead to uneven freezing or energy waste. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the existing technology and provide an intelligent feedback method for dynamic regulation of permafrost intersection, so as to solve the problem that the existing permafrost intersection monitoring mainly relies on temperature sensors and manual inspections, which makes it difficult to quantify the changes in the mechanical state of permafrost in real time, resulting in delayed regulation.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides an intelligent feedback method for dynamic control of frozen soil interlocking, which is based on inserting a freezing pipe into a frozen soil area that needs to be frozen, and includes the following steps:

[0007] Providing an ultrasonic sensor, using the ultrasonic sensor to regularly transmit ultrasonic waves to the frozen soil area, and receiving the ultrasonic waves to obtain waveform data of the ultrasonic waves when they propagate in the frozen soil area;

[0008] The waveform data is analyzed and calculated to obtain the propagation velocity v of ultrasonic waves in the frozen soil area;

[0009] Based on the propagation velocity v of ultrasound in the frozen soil area, the elastic modulus E of the frozen soil area is calculated. d ;

[0010] Calculate the elastic modulus E of the frozen soil area drate of change;

[0011] Set the minimum change rate limit for the elastic modulus E d The rate of change and the minimum rate of change limit K min For comparison, when the elastic modulus E d The rate of change is less than the minimum rate of change limit K min When the temperature of the refrigerant in the freezing pipe is reduced, the flow rate of the refrigerant in the freezing pipe is increased until the elastic modulus E d The rate of change is greater than or equal to the minimum rate of change limit K min , in order to achieve the best freezing effect;

[0012] At the same time, based on the elastic modulus E d , judge whether the frozen soil area is completely frozen. If the freezing is not complete, continue to freeze the frozen soil area through the freezing pipe. If the freezing is complete, stop freezing the frozen soil area.

[0013] Furthermore, based on the elastic modulus E d The steps to determine whether the frozen ground area is frozen are as follows:

[0014] Set the elastic modulus threshold E in the frozen soil area dmax ;

[0015] Elastic modulus E d and the elastic modulus threshold E dmax For comparison, when E d <XE dmax When , it is determined that the frozen soil area has not been completely frozen, and the frozen soil area continues to be frozen through the freezing pipe, where X is the coefficient;

[0016] When E d ≥XE dmax When , it is determined that the frozen ground area is completely frozen and the freezing of the frozen ground area is stopped.

[0017] Furthermore, the elastic modulus E of the frozen soil area is calculated. d When using the following formula: E d =v2(1+u)(1-2u) / (1-u), where u is Poisson's ratio.

[0018] Furthermore, the value of X is 0.9-1.

[0019] Furthermore, the elastic modulus threshold E dmax The setting method is as follows:

[0020] Soil sampling in permafrost areas;

[0021] Freeze the sampled soil. After it is completely frozen, the elastic modulus of the sampled soil is the elastic modulus threshold Edmax .

[0022] Furthermore, before using the ultrasonic sensor, transmitting holes and receiving holes are dug at intervals in the frozen soil area, and the sound wave transmitter and sound wave receiver of the ultrasonic sensor are respectively arranged in the transmitting hole and the receiving hole, and the sound wave transmitter and the sound wave receiver are made to correspond to each other;

[0023] When the ultrasonic sensor is used, the ultrasonic transmitter emits ultrasonic waves toward the frozen soil area, the ultrasonic waves propagate in the frozen soil area, and the ultrasonic receiver receives the ultrasonic waves, thereby obtaining waveform data of the ultrasonic waves propagating in the frozen soil area.

[0024] Furthermore, the distance between the transmitting hole and the receiving hole is 1.5m to 2m.

[0025] Furthermore, based on the collected waveform data, the propagation time t of the ultrasonic wave from the acoustic wave transmitter to the acoustic wave receiver is measured, and the propagation speed v of the ultrasonic wave in the permafrost area is calculated according to the propagation time t according to the following formula: v = L / t, where L is the distance between the acoustic wave transmitter and the acoustic wave receiver.

[0026] The present invention also provides an intelligent feedback system for dynamic regulation of frozen soil interaction, comprising:

[0027] Ultrasonic sensor, including a sound wave transmitter and a sound wave receiver, the sound wave transmitter and the sound wave receiver are buried in the frozen soil area, and the sound wave transmitter regularly transmits ultrasonic waves into the frozen soil area;

[0028] The analysis module is connected to the acquisition module and is used to analyze and calculate the waveform data collected by the acquisition module to obtain the elastic modulus E of the frozen soil area. d , and then judge whether the frozen ground area is completely frozen;

[0029] Intelligent control module for calculating the elastic modulus E in frozen soil areas d The rate of change of the elastic modulus E is adjusted by adjusting the temperature and flow of the refrigerant in the freezing tube. d The rate of change reaches the minimum rate of change limit K min .

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The propagation speed of ultrasonic waves in the frozen soil area is detected by ultrasonic sensors, and the elastic modulus E of the frozen soil area is calculated based on the propagation speed. d , to determine whether the frozen ground area has reached the freezing standard, and then determine whether the frozen ground area has reached the circle. It does not rely on temperature sensors and manual inspections, which improves accuracy.

[0032] Elastic modulus E for frozen soil areas d Calculation is performed when the elastic modulus E d The rate of change is less than K min When the temperature and flow rate of the refrigerant in the freezing pipe are adjusted, the freezing pipe has sufficient freezing efficiency to freeze the frozen soil area until the elastic modulus E d The rate of change is greater than or equal to K min . BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is an operational flow chart of the intelligent feedback method for dynamic regulation of frozen soil interaction according to the present invention.

[0034] Figure 2 This is a cross-sectional schematic diagram of a frozen soil area according to the intelligent feedback method for dynamic regulation of frozen soil interaction circles of the present invention.

[0035] Figure 3 This is a schematic longitudinal section diagram of a frozen soil area according to the intelligent feedback method for dynamic regulation of frozen soil interaction circles of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] See Figure 1 The present invention provides an intelligent feedback method for dynamic control of frozen soil cross-circle, which solves the problem that the existing frozen soil cross-circle monitoring mainly relies on temperature sensors and manual inspections, making it difficult to quantify the changes in the mechanical state of frozen soil in real time, resulting in delayed control. By using ultrasonic sensors to detect the propagation speed of ultrasonic waves in the frozen soil area, the elastic modulus E of the frozen soil area is calculated based on the propagation speed. d , to determine whether the frozen ground area has reached the freezing standard, and then determine whether the frozen ground area has reached the circle. It does not rely on temperature sensors and manual inspections, which improves accuracy.

[0038] Elastic modulus E for frozen soil areas d Calculation is performed when the elastic modulus E d The rate of change is less than K min When the temperature and flow rate of the refrigerant in the freezing pipe are adjusted, the freezing pipe has sufficient freezing efficiency to freeze the frozen soil area until the elastic modulus E d The rate of change is greater than or equal to K min .

[0039] The following describes an intelligent feedback method for dynamic control of frozen soil interaction according to the present invention in conjunction with the accompanying drawings.

[0040] See Figure 1, shows the operation flow chart of the intelligent feedback method for dynamic regulation of frozen soil interaction of the present invention. Figure 1 , an intelligent feedback method for dynamic regulation of frozen soil interaction circles according to the present invention is described.

[0041] like Figure 1 As shown, the present invention provides an intelligent feedback method for dynamic control of frozen soil interaction, based on inserting a freezing pipe into a frozen soil area that needs to be frozen, comprising the following steps:

[0042] Providing an ultrasonic sensor, using the ultrasonic sensor to regularly transmit ultrasonic waves to the frozen soil area, and receiving the ultrasonic waves to obtain waveform data of the ultrasonic waves when they propagate in the frozen soil area;

[0043] The waveform data is analyzed and calculated to obtain the propagation velocity v of ultrasonic waves in the frozen soil area;

[0044] Based on the propagation velocity v of ultrasound in the frozen soil area, the elastic modulus E of the frozen soil area is calculated. d ;

[0045] Calculate the elastic modulus E of the frozen soil area d rate of change;

[0046] Set the minimum change rate limit for the elastic modulus E d The rate of change and the minimum rate of change limit K min For comparison, when the elastic modulus E d The rate of change is less than the minimum rate of change limit K min When the temperature of the refrigerant in the freezing pipe is reduced, the flow rate of the refrigerant in the freezing pipe is increased until the elastic modulus E d The rate of change is greater than or equal to the minimum rate of change limit K min , in order to achieve the best freezing effect;

[0047] At the same time, based on the elastic modulus E d , judge whether the frozen soil area is completely frozen. If the freezing is not complete, continue to freeze the frozen soil area through the freezing pipe. If the freezing is complete, stop freezing the frozen soil area.

[0048] Specifically, a unit acquisition time is set so that the ultrasonic sensor transmits ultrasonic waves to the frozen soil area based on the unit acquisition time.

[0049] Preferably, the unit collection time is 1 to 10 minutes.

[0050] In one embodiment, based on the elastic modulus E d The steps to determine whether the frozen ground area is frozen are as follows:

[0051] Set the elastic modulus threshold E in the frozen soil areadmax ;

[0052] Elastic modulus E d and the elastic modulus threshold E dmax For comparison, when E d <XE dmax When , it is determined that the frozen soil area has not been completely frozen, and the frozen soil area continues to be frozen through the freezing pipe, where X is the coefficient;

[0053] When E d ≥XE dmax When , it is determined that the frozen ground area is completely frozen and the freezing of the frozen ground area is stopped.

[0054] In one embodiment, the elastic modulus E of the frozen soil region is calculated. d When using the following formula: E d =v 2 Calculated as (1+u)(1-2u) / (1-u), where u is Poisson's ratio.

[0055] In a specific embodiment, the value of X is 0.9-1.

[0056] In one embodiment, the elastic modulus threshold E dmax The setting method is as follows:

[0057] Soil sampling in permafrost areas;

[0058] Freeze the sampled soil. After it is completely frozen, the elastic modulus of the sampled soil is the elastic modulus threshold E dmax .

[0059] In a specific embodiment, before using the ultrasonic sensor, transmitting holes and receiving holes are dug at intervals in the frozen soil area, and the sound wave transmitter and sound wave receiver of the ultrasonic sensor are respectively arranged in the transmitting hole and the receiving hole, and the sound wave transmitter and the sound wave receiver are aligned with each other;

[0060] When the ultrasonic sensor is used, the ultrasonic transmitter emits ultrasonic waves toward the frozen soil area, the ultrasonic waves propagate in the frozen soil area, and the ultrasonic receiver receives the ultrasonic waves, thereby obtaining waveform data of the ultrasonic waves propagating in the frozen soil area.

[0061] In a specific embodiment, the distance between the transmitting hole and the receiving hole is 1.5m to 2m.

[0062] In a specific embodiment, based on the collected waveform data, the propagation time t of the ultrasonic wave from the acoustic wave transmitter to the acoustic wave receiver is measured, and the propagation speed v of the ultrasonic wave in the permafrost area is calculated according to the propagation time t according to the following formula: v = L / t, where L is the distance between the acoustic wave transmitter and the acoustic wave receiver.

[0063] In a specific embodiment, an early warning device is provided. When the elastic modulus E is detected, d The rate of change is less than K min When the alarm is triggered, the early warning device sounds an alarm, thereby attracting the attention of personnel.

[0064] Specifically, the freezing pipe is connected to a refrigeration unit and a circulation pump. The refrigeration unit is used to cool the refrigerant in the freezing pipe, and the circulation pump is used to drive the refrigerant in the freezing pipe to circulate. The temperature of the refrigerant in the freezing pipe is adjusted by adjusting the refrigeration efficiency of the refrigeration unit, and the flow rate of the refrigerant in the freezing pipe is adjusted by adjusting the power of the circulation pump.

[0065] In a specific embodiment, the freezing temperature of the refrigeration unit is not lower than -45°C, and the maximum adjustment range of the circulation pump flow is 20%.

[0066] Preferably, the ultrasonic sensors can be set in multiple groups, and the lines from the acoustic wave transmitter to the acoustic wave receiver are different, so that the elastic modulus E of multiple locations in the frozen soil area can be calculated. d , to prevent errors.

[0067] The present invention also provides an intelligent feedback system for dynamic regulation of frozen soil interaction, comprising:

[0068] Ultrasonic sensor, including a sound wave transmitter and a sound wave receiver, the sound wave transmitter and the sound wave receiver are buried in the frozen soil area, and the sound wave transmitter regularly transmits ultrasonic waves into the frozen soil area;

[0069] The analysis module is connected to the acquisition module and is used to analyze and calculate the waveform data collected by the acquisition module to obtain the elastic modulus E of the frozen soil area. d , and then judge whether the frozen ground area is completely frozen;

[0070] Intelligent control module for calculating the elastic modulus E in frozen soil areas d The rate of change of the elastic modulus E is adjusted by adjusting the temperature and flow of the refrigerant in the freezing tube. d The rate of change reaches the minimum rate of change limit K min .

[0071] Specifically, it also includes an acquisition module, which is connected to the ultrasonic sensor and is used to regularly control the ultrasonic sensor's sound wave transmitter to transmit ultrasonic waves to the frozen soil area, and control the sound wave receiver to receive the ultrasonic waves, thereby acquiring waveform data.

[0072] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. An intelligent feedback method for dynamic control of frozen soil circulation, based on the insertion of freezing pipes into the frozen soil area to be frozen, characterized by: The steps include: Providing an ultrasonic sensor, using the ultrasonic sensor to regularly transmit ultrasonic waves to the frozen soil area, and receiving the ultrasonic waves to obtain waveform data of the ultrasonic waves when they propagate in the frozen soil area; The waveform data is analyzed and calculated to obtain the propagation velocity v of ultrasonic waves in the frozen soil area; Based on the propagation velocity v of ultrasound in the frozen soil area, the elastic modulus E of the frozen soil area is calculated. d ; Calculate the elastic modulus E of the frozen soil area d rate of change; Set the minimum change rate limit for the elastic modulus E d The rate of change and the minimum rate of change limit K min For comparison, when the elastic modulus E d The rate of change is less than the minimum rate of change limit K min When the temperature of the refrigerant in the freezing pipe is reduced, the flow rate of the refrigerant in the freezing pipe is increased until the elastic modulus E d The rate of change is greater than or equal to the minimum rate of change limit K min , in order to achieve the best freezing effect; At the same time, based on the elastic modulus E d , judge whether the frozen soil area is completely frozen. If the freezing is not complete, continue to freeze the frozen soil area through the freezing pipe. If the freezing is complete, stop freezing the frozen soil area.

2. The intelligent feedback method for dynamic control of frozen soil interaction according to claim 1, characterized in that: Based on the elastic modulus E d The steps to determine whether the frozen ground area is frozen are as follows: Set the elastic modulus threshold E in the frozen soil area dmax ; Elastic modulus E d and the elastic modulus threshold E dmax For comparison, when E d <XE dmax When , it is determined that the frozen soil area has not been completely frozen, and the frozen soil area continues to be frozen through the freezing pipe, where X is the coefficient; When E d ≥XE dmax When , it is determined that the frozen ground area is completely frozen and the freezing of the frozen ground area is stopped.

3. The intelligent feedback method for dynamic control of frozen soil interaction according to claim 2, characterized in that: Calculate the elastic modulus E of the frozen soil area d When using the following formula: E d =v 2 Calculated as (1+u)(1-2u) / (1-u), where u is Poisson's ratio.

4. The intelligent feedback method for dynamic control of frozen soil interaction according to claim 2, characterized in that: The value of X is 0.9-1.

5. The intelligent feedback method for dynamic control of frozen soil interaction according to claim 2, characterized in that: Elastic modulus threshold E dmax The setting method is as follows: Soil sampling in permafrost areas; Freeze the sampled soil. After it is completely frozen, the elastic modulus of the sampled soil is the elastic modulus threshold E dmax .

6. The intelligent feedback method for dynamic control of frozen soil interaction according to claim 1, characterized in that: Before using the ultrasonic sensor, a transmitting hole and a receiving hole are dug at intervals in the frozen soil area, and the sound wave transmitter and the sound wave receiver of the ultrasonic sensor are respectively arranged in the transmitting hole and the receiving hole, and the sound wave transmitter and the sound wave receiver are made to correspond to each other; When the ultrasonic sensor is used, the ultrasonic transmitter emits ultrasonic waves toward the frozen soil area, the ultrasonic waves propagate in the frozen soil area, and the ultrasonic receiver receives the ultrasonic waves, thereby obtaining waveform data of the ultrasonic waves propagating in the frozen soil area.

7. The intelligent feedback method for dynamic control of frozen soil interaction according to claim 6, characterized in that: The distance between the transmitting hole and the receiving hole is 1.5m to 2m.

8. The intelligent feedback method for dynamic control of frozen soil interaction according to claim 6, characterized in that: Based on the collected waveform data, the propagation time t of the ultrasonic wave from the acoustic wave transmitter to the acoustic wave receiver is measured, and the propagation speed v of the ultrasonic wave in the permafrost area is calculated according to the propagation time t according to the following formula: v = L / t, where L is the distance between the acoustic wave transmitter and the acoustic wave receiver.

9. An intelligent feedback system for dynamic control of frozen soil interaction, characterized by: include: Ultrasonic sensor, including a sound wave transmitter and a sound wave receiver, the sound wave transmitter and the sound wave receiver are buried in the frozen soil area, and the sound wave transmitter regularly transmits ultrasonic waves into the frozen soil area; The analysis module is connected to the acquisition module and is used to analyze and calculate the waveform data collected by the acquisition module to obtain the elastic modulus E of the frozen soil area. d , and then judge whether the frozen ground area is completely frozen; Intelligent control module for calculating the elastic modulus E in frozen soil areas d The rate of change of the elastic modulus E is adjusted by adjusting the temperature and flow of the refrigerant in the freezing tube. d The rate of change reaches the minimum rate of change limit K min .

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