Shallow-buried tunnel pipe curtain deviation rectifying and pressure maintaining method and system based on mobile grouting

Abstract

The invention relates to the technical field of tunnel pipe curtain deviation rectifying and pressure maintaining, in particular to a shallow-buried tunnel pipe curtain deviation rectifying and pressure maintaining method and system based on movable grouting, and provides a movable grouting device special for grouting of a gap between a pipe curtain and tunnel surrounding rock, and the movable grouting device can move along the pipe curtain to adjust the grouting position. According to the method, during movable grouting, the settlement value of the soil layer above the pipe roofing, the deviation coordinates of the pipe roofing and the tunnel surrounding rock pressure in the pipe roofing soil layer are collected, so that the state of the pipe roofing is judged, different grouting strategies are selected based on the state of the pipe roofing, and a scientific and effective grouting scheme is provided for different conditions. The grouting device has the advantages of high grouting precision, high response speed and the like.

Description

Technical Field

[0001] This application relates to the field of tunnel pipe curtain correction and pressure maintenance technology, specifically a method and system for correction and pressure maintenance of shallow buried tunnel pipe curtain based on mobile grouting. Background Technology

[0002] In underground engineering construction, pipe jacking technology is widely used in tunnel excavation and underground passage construction. However, during pipe jacking, due to complex geological conditions and limitations in the precision of construction equipment, pipe jacking can easily lead to pipe deviation and excessive gaps between the tunnel surrounding rock and the pipe jacking steel pipes. This results in uneven stress on the pipe jacking system, loss of pressure in the tunnel surrounding rock, and other adverse factors, causing surface subsidence and affecting project quality and construction safety. Traditional methods for correction and pressure maintenance have shortcomings such as low precision and slow response speed. Therefore, there is an urgent need for a more efficient and precise method for correction and pressure maintenance in pipe jacking. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a method and system for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting, so as to solve the problems in the background art.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] This application discloses a method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting, comprising the following steps:

[0006] When the mobile grouting device is controlled to advance along the gap between the pipe curtain and the surrounding rock of the tunnel, the settlement value of the soil layer above the pipe curtain, the offset coordinate of the pipe curtain, and the pressure of the surrounding rock of the tunnel in the soil layer of the pipe curtain are obtained.

[0007] The grouting strategy for the corresponding section of the pipe curtain is determined based on the settlement value and the offset coordinates. The grouting strategy includes one or more combinations of grouting location, grouting volume, grouting pressure, grouting movement direction, and grouting stop judgment conditions.

[0008] Grouting is performed using a mobile grouting device controlled by the aforementioned grouting strategy. The mobile grouting device includes a main body, a circumferential slide rail, a guide rod, a grouting pipe, and a pneumatic pipe. The circumferential slide rail is fitted to the top or bottom surface of the pipe curtain. The main body slides annularly with the circumferential slide rail and is axially locked. The guide rod engages with the main body to drive the main body to move along the circumferential slide rail or to drive the main body and the circumferential slide rail to move along their axis. The grouting pipe and the pneumatic pipe are fixed to the main body. One end of the grouting pipe is a grouting nozzle, and the other end is connected to an external grouting machine. One end of the pneumatic pipe is equipped with an air bladder for opening gaps, and the other end is connected to an external air compressor.

[0009] In one embodiment of this application, determining the grouting strategy for the corresponding section of the pipe curtain based on the settlement value and the offset coordinates includes:

[0010] The settlement value of each section of the pipe curtain is compared with the preset settlement threshold, and the deviation of each section of the pipe curtain is compared with the preset deviation threshold. The deviation is the distance between the designed midpoint and the actual midpoint of the pipe curtain.

[0011] When the settlement value of the pipe curtain is less than the preset settlement threshold and the deviation of the pipe curtain is less than the preset deviation threshold, the pipe curtain is determined to be in an ideal state, and the first grouting strategy corresponding to the ideal state is selected and executed.

[0012] When the settlement value of the pipe curtain is less than the preset settlement threshold and the deviation of the pipe curtain is greater than or equal to the preset deviation threshold, the pipe curtain is determined to be in a path deviation state, and the second grouting strategy corresponding to the path deviation state is selected and executed.

[0013] When the settlement value of the pipe curtain is greater than or equal to the preset settlement threshold and the deviation of the pipe curtain is less than the preset deviation threshold, the pipe curtain is determined to be in a settlement state, and the third grouting strategy corresponding to the settlement state is selected and executed.

[0014] When the settlement value of the pipe curtain is greater than or equal to the preset settlement threshold, and the deviation of the pipe curtain is greater than or equal to the preset deviation threshold, the second grouting strategy is executed first, and then the third grouting strategy is executed.

[0015] In one embodiment of this application, the first grouting strategy includes: the circumferential grouting position is arbitrary, and the grouting volume is... The grouting pressure is The grouting movement direction is from the inside out. The surrounding rock pressure, of which, The void volume is the volume between the pipe curtain and the surrounding rock. The mathematical expression is:

[0016]

[0017] In the formula, This indicates the axial movement of the mobile grouting device. Indicates the tunnel diameter. Indicates the diameter of the tube curtain.

[0018] In one embodiment of this application, the second grouting strategy includes: the grouting location is at the point of minimum gap, and the grouting volume is... The grouting pressure is The grouting movement direction is from the inside to the outside, and the minimum gap is determined based on the offset coordinate.

[0019] In one embodiment of this application, the third grouting strategy includes:

[0020] Phase 1: Grouting location is above the pipe curtain, grouting volume is... The grouting pressure is After grouting is completed, the settlement rate of the soil layer above the pipe curtain is extracted. When the settlement rate is less than the preset rate threshold, grouting is stopped. When the settlement rate is still greater than or equal to the preset rate threshold, the second stage of grouting is then carried out.

[0021] Phase Two: Grouting pressure increased to... The cumulative grouting volume has increased to After grouting is completed, the settlement rate of the soil layer above the pipe curtain is extracted. When the settlement rate is less than the preset rate threshold, grouting is stopped. When the settlement rate is still greater than or equal to the preset rate threshold, the third stage of grouting is then carried out.

[0022] Third stage: Control the mobile grouting device to move and grout within the expansion grouting range until the pressure inside the airbag reaches the required level. The grouting pressure is maintained at Grouting volume increased to ,in, This indicates the settlement value.

[0023] In one embodiment of this application, it further includes:

[0024] After the third stage of grouting is completed, the settlement rate of the soil layer above the pipe curtain is extracted. If the settlement rate is still greater than or equal to the preset rate threshold, a prompt message is output to prompt the verification of other settlement causes.

[0025] In one embodiment of this application, the mobile grouting device further includes a control circuit and a drive device for driving the main body to move along the annular slide rail. The control circuit and the drive device are both fixed to the main body. One end of the control circuit is connected to the drive device, and the other end of the control circuit is connected to an external control console.

[0026] In one embodiment of this application, controlling a mobile grouting device to perform grouting based on the grouting strategy includes:

[0027] The guide rod drives the main body and the circumferential slide rail to slide along the pipe curtain axis until the axial grouting position in the grouting strategy is reached;

[0028] When circumferential sliding is required in the grouting strategy, the main body is controlled to move along the circumferential slide rail to the circumferential grouting position;

[0029] The air compressor is controlled to inject gas into the airbag along the air pressure pipe to fill the gaps;

[0030] The grouting machine is controlled to input grouting material along the grouting pipe to the grouting nozzle, and the grouting nozzle is used to grout the gap.

[0031] In one embodiment of this application, after controlling the mobile grouting device to perform grouting based on the grouting strategy, the method further includes:

[0032] The settlement value of the soil layer above the pipe curtain, the offset coordinates of the pipe curtain, and the tunnel surrounding rock pressure within the soil layer of the pipe curtain are obtained. The grouting strategy for the corresponding section of the pipe curtain is then determined based on the settlement value and the offset coordinates.

[0033] This application also provides a shallow-buried tunnel pipe curtain correction and pressure maintenance system based on mobile grouting, including:

[0034] The data acquisition module is used to acquire the settlement value of the soil layer above the pipe curtain, the offset coordinates of the pipe curtain, and the pressure of the surrounding rock of the tunnel within the pipe curtain soil layer when the mobile grouting device is jacked along the gap between the pipe curtain and the tunnel surrounding rock.

[0035] The strategy selection module is used to determine the grouting strategy of the corresponding section of the pipe curtain based on the settlement value and the offset coordinate. The grouting strategy includes one or more combinations of grouting position, grouting volume, grouting pressure, grouting movement direction and grouting stop judgment conditions.

[0036] A control module is used to control a mobile grouting device to perform grouting based on the grouting strategy. The mobile grouting device includes a main body, a circumferential slide rail, a guide rod, a grouting pipe, and a pneumatic pipe. The circumferential slide rail is in contact with the top or bottom surface of the pipe curtain. The main body is in a circumferential sliding fit and an axial locking fit with the circumferential slide rail. The guide rod cooperates with the main body to drive the main body to move along the circumferential slide rail or to drive the main body and the circumferential slide rail axis to move. The grouting pipe and the pneumatic pipe are fixed to the main body. One end of the grouting pipe is a grouting nozzle, and the other end of the grouting pipe is connected to an external grouting machine. One end of the pneumatic pipe is provided with an air bladder for opening gaps, and the other end of the pneumatic pipe is connected to an external air compressor.

[0037] The beneficial effects of this application are as follows: This application provides a method and system for correcting deviation and maintaining pressure in shallow-buried tunnel pipe curtains based on mobile grouting. Firstly, it provides a mobile grouting device specifically designed for grouting the gap between the pipe curtain and the surrounding rock of the tunnel. This mobile grouting device can move along the pipe curtain to adjust the grouting position. During mobile grouting, the settlement value of the soil layer above the pipe curtain, the deviation coordinates of the pipe curtain, and the pressure of the surrounding rock within the pipe curtain soil layer are collected to determine the condition of the pipe curtain. Based on the pipe curtain condition, different grouting strategies are selected, providing scientific and effective grouting solutions for different situations. This application has advantages such as high grouting accuracy and fast response speed. Attached Figure Description

[0038] The present application will be further described below with reference to the accompanying drawings and embodiments:

[0039] Figure 1 This is a schematic diagram of the structure of a mobile grouting device in one embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the overall structure of the mobile grouting device in one embodiment of this application;

[0041] Figure 3 This is a flowchart illustrating a method for correcting deviation and maintaining pressure in a shallow-buried tunnel pipe curtain based on mobile grouting, according to one embodiment of this application.

[0042] Figure 4 This is a flowchart of a method for correcting deviation and maintaining pressure in a shallow buried tunnel pipe curtain based on mobile grouting, according to one embodiment of this application.

[0043] Figure 5 This is a schematic diagram of the ideal state of the tube curtain in one embodiment of this application;

[0044] Figure 6 This is a schematic diagram of the pipe curtain being in a path offset state in one embodiment of this application;

[0045] Figure 7 This is a schematic diagram showing the state of surface settlement of the soil layer above the pipe curtain in one embodiment of this application.

[0046] Figure 8 This is a structural diagram of a shallow-buried tunnel pipe curtain correction and protection system based on mobile grouting according to an embodiment of this application;

[0047] The attached figures are labeled as follows:

[0048] 1-Main body, 2-Circular slide rail, 3-Guide rod, 4-Grouting pipe, 41-Grouting nozzle, 5-Air pressure pipe, 51-Airbag. Detailed Implementation

[0049] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0050] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the layers related to this application and are not drawn according to the actual number, shape and size of the layers in the actual implementation. In the actual implementation, the form, number and proportion of each layer can be arbitrarily changed, and the layer layout may also be more complex.

[0051] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of this application; however, it will be apparent to those skilled in the art that embodiments of this application may be practiced without these specific details.

[0052] Figure 1 This is a schematic diagram of the structure of a mobile grouting device in one embodiment of this application, as shown below. Figure 1 As shown, the mobile grouting device in this application includes a main body 1, a circumferential slide rail 2, a guide rod 3, a grouting pipe 4, and a pneumatic pipe 5. The circumferential slide rail 2 is attached to the top or bottom surface of the pipe curtain. The main body 1 is in annular sliding engagement with the circumferential slide rail 2 and axial locking engagement. The guide rod 3 engages with the main body 1 to drive the main body 1 to move along the circumferential slide rail 2 or to drive the main body 1 and the circumferential slide rail 2 to move along their axis. The grouting pipe 4 and the pneumatic pipe 5 are fixed to the main body 1. One end of the grouting pipe 4 is a grouting nozzle 41, and the other end of the grouting pipe 4 is connected to an external grouting machine. One end of the pneumatic pipe 5 is provided with an airbag 51 for opening the gap, and the other end of the pneumatic pipe 5 is connected to an external air compressor.

[0053] In addition, the mobile grouting device also includes a control circuit and a drive device for driving the main body 1 to move along the annular slide rail 2. The control circuit and the drive device are both fixed to the main body 1. One end of the control circuit is connected to the drive device, and the other end of the control circuit is connected to an external control console.

[0054] Figure 2 This is a schematic diagram of the overall structure of the mobile grouting device in one embodiment of this application, as shown below. Figure 2 As shown in this application, the settlement value of the soil layer above the pipe curtain is monitored by surface settlement monitoring equipment, and a pressure sensor is installed on the inner wall of the surrounding rock to collect the surrounding rock pressure; the grouting machine, air compressor and control console are all connected to the mobile grouting device in the tunnel through pipelines.

[0055] Figure 3 This is a logic flowchart of a shallow-buried tunnel pipe curtain correction and pressure maintenance method based on mobile grouting according to one embodiment of this application, as follows: Figure 3As shown, the general idea of ​​this application is that, upon completion of the grouting process of the previous section of the pipe curtain, the mobile grouting device is advanced to the area where the current pipe curtain is located to perform surface settlement monitoring and surrounding rock pressure monitoring. The obtained surface monitoring data and surrounding rock pressure monitoring data are sent to the control console (via wired or wireless transmission). The control console analyzes and formulates a grouting strategy through engineering analogy and numerical calculations. After obtaining the grouting strategy, the control console sends control commands to the air compressor and grouting machine to control the position adjustment of the mobile grouting device and the size adjustment of the airbags to control the surrounding rock porosity. Grouting is then implemented, utilizing... Figure 1 The mobile grouting device shown performs mobile grouting, simultaneously collecting real-time ground settlement data. During the jacking process, the device uses positioning equipment to collect real-time deviation data of the pipe curtain. The settlement and deviation data are used to select the appropriate grouting strategy and make adjustments in real time. Finally, it determines whether the deviation correction and pressure maintenance requirements are met. If so, the grouting process for the current pipe curtain is completed. If not, the process returns to the previous steps, and a new grouting procedure is selected.

[0056] Figure 4 This is a flowchart illustrating the practical application of a method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting, as described in one embodiment of this application. Figure 4 As shown, the specific process includes:

[0057] S410: When controlling the mobile grouting device to advance along the gap between the pipe curtain and the surrounding rock of the tunnel, the settlement value of the soil layer above the pipe curtain, the offset coordinate of the pipe curtain, and the pressure of the surrounding rock of the tunnel in the soil layer of the pipe curtain are obtained.

[0058] First, the settlement of the ground surface above the shallow-buried tunnel is monitored in real time using surface settlement monitoring equipment. At the same time, the internal pressure between the pipe curtain steel pipe and the surrounding rock is monitored, and the monitoring data is transmitted to the control console in real time.

[0059] S420, Based on the settlement value and the offset coordinate, determine the grouting strategy for the corresponding section of the pipe curtain, wherein the grouting strategy includes one or more combinations of grouting position, grouting volume, grouting pressure, grouting movement direction and grouting stop judgment conditions;

[0060] After receiving the monitoring data, the control console analyzes and judges the data. Based on the deviation of the pipe curtain steel pipe, the change of surrounding rock pressure, and the degree of surface subsidence, it formulates a corresponding grouting strategy and then sends control commands to the air compressor and grouting machine.

[0061] The specific analysis process and selection of grouting strategy are as follows:

[0062] The settlement value of each section of the pipe curtain is compared with the preset settlement threshold, and the deviation of each section of the pipe curtain is compared with the preset deviation threshold. The deviation is the distance between the designed midpoint and the actual midpoint of the pipe curtain.

[0063] (1) When the settlement value of the pipe curtain is less than the preset settlement threshold and the deviation of the pipe curtain is less than the preset deviation threshold, the pipe curtain is determined to be in an ideal state, and the first grouting strategy corresponding to the ideal state is selected and executed.

[0064] If the above conditions apply, it indicates that the tube curtain is in an ideal state. Figure 5 This is a schematic diagram of the ideal state of the pipe curtain in one embodiment of this application, as shown below. Figure 5 As shown, when the actual construction conditions during the pipe jacking process meet the design conditions (i.e., ideal state), only full-ring grouting is required in the gap between the pipe jacking and the surrounding rock. During full-ring grouting, the grouting device injects grout axially from the inside out, and the circumferential position can be arbitrarily selected according to the site construction conditions without the need for circumferential movement. The grouting pressure is 1.2 times the earth pressure P obtained from the surrounding rock pressure monitoring. The grouting volume is the volume of the void between the pipe jacking and the surrounding rock. 1.5 to 1.7 times ( (where l is the axial movement range of the grouting device). Indicates the tunnel diameter. Indicates the diameter of the tube curtain.

[0065] (2) When the settlement value of the pipe curtain is less than the preset settlement threshold and the deviation of the pipe curtain is greater than or equal to the preset deviation threshold, the pipe curtain is determined to be in a path deviation state, and the second grouting strategy corresponding to the path deviation state is selected and executed.

[0066] If the above situation applies, it indicates that the pipe curtain is in a path deviation state. Figure 6 This is a schematic diagram illustrating the state of the pipe curtain in a path offset state according to one embodiment of this application, as shown below. Figure 6 As shown, when the pipe curtain jacking process deviates from its path, the grouting device grouts axially from the inside out, moves circumferentially to the key grouting position in the direction of smaller gaps, and inflates the airbags until the pipe curtain path conforms to the design position. The grouting pressure is... Grouting volume .

[0067] (3) When the settlement value of the pipe curtain is greater than or equal to the preset settlement threshold and the deviation of the pipe curtain is less than the preset deviation threshold, the pipe curtain is determined to be in a settlement state, and the third grouting strategy corresponding to the settlement state is selected and executed.

[0068] If the above situation applies, it indicates that there is a problem of surface settlement in the soil layer above the pipe curtain. Figure 7 This is a schematic diagram illustrating the surface settlement of the soil layer above the pipe curtain in one embodiment of this application, as shown below. Figure 7 As shown, when the surface settles, this application adopts a three-stage grouting strategy, as detailed below:

[0069] Phase 1: Filling the voids: The key grouting location is above the pipe curtain, the grouting pressure is 1.2P, and the grouting volume is 1.5V;

[0070] After the first stage of grouting is completed, the surface settlement velocity is collected. If the surface settlement rate is effectively controlled, grouting is stopped; if the surface settlement rate still does not decrease, the second stage of grouting is carried out.

[0071] Phase Two: Pressure-Boosting Grouting Phase. The grouting pressure is increased by 1.5P, and the cumulative grouting volume is increased to 2V.

[0072] After the second stage of grouting is completed, the surface settlement velocity is collected. If the surface settlement rate is effectively controlled, grouting is stopped; if the surface settlement rate still does not decrease, the third stage of grouting is carried out.

[0073] Phase Three: Expansion Grouting Phase. The grouting device moves and grouts within the expansion grouting range. During the grouting process, the airbag is inflated until the internal pressure reaches [a certain value]. The grouting pressure is maintained at 1.5P, and the grouting volume is increased to (2V + πD). c δl), This indicates the settlement value.

[0074] If the surface settlement is still not controlled after the three-stage grouting is completed, it indicates that the pipe jacking is not the main cause of the surface settlement. At this time, it is necessary to output a warning message to indicate that the construction risk is relatively high. In addition to strictly grouting according to the above grouting strategy, other construction risks should also be investigated.

[0075] (4) When the settlement value of the pipe curtain is greater than or equal to the preset settlement threshold and the deviation of the pipe curtain is greater than or equal to the preset deviation threshold, the second grouting strategy is executed first, and then the third grouting strategy is executed.

[0076] In addition, surface deformation and pipe curtain misalignment should be monitored in real time during the grouting process. If path deviation and surface settlement occur simultaneously, pipe curtain correction grouting should be prioritized. If surface heave occurs during the grouting process, grouting should be stopped immediately.

[0077] S430, based on the grouting strategy, control the mobile grouting device to perform grouting.

[0078] Specifically, the actual control process based on the above strategy includes:

[0079] Axial movement: The guide rod 3 drives the main body 1 and the circumferential slide rail 2 to slide along the pipe curtain axis until they reach the axial grouting position in the grouting strategy;

[0080] Circumferential movement: When circumferential sliding is required in the grouting strategy, the main body 1 is controlled to move along the circumferential slide rail 2 to the circumferential grouting position; specifically, the two ends of the circumferential slide rail directly act on the clamping position of the pipe curtain steel pipe, the driving device is a motor, the motor drives the gear at the end of the guide rod to cooperate with the circumferential slide rail, so that the moving grouting device slides along the circumferential (circumferential direction) of the pipe curtain steel pipe and is adjusted to the target circumferential position.

[0081] The air compressor is controlled to inject gas into the airbag along the air pressure pipe 5 to fill the gap; the air compressor introduces gas into the airbag through the air pressure pipe and controls the inflation degree of the airbag, thereby appropriately filling or regulating the gap between the pipe curtain steel pipe and the surrounding rock, creating conditions for subsequent grouting and assisting in the correction of the position of the pipe curtain steel pipe.

[0082] The grouting machine controls the grouting material to be fed into the grouting nozzle 41 along the grouting pipe 4, and the grouting nozzle 41 is used to grout the gaps. The grouting machine delivers the grouting material to the grouting nozzle through the grouting pipe, and the grouting nozzle injects grout into the gap between the pipe curtain steel pipe and the surrounding rock at designated axial and circumferential positions, thereby achieving pressure maintenance of the surrounding rock and position correction of the pipe curtain steel pipe.

[0083] Finally, during and after grouting, data is continuously acquired through monitoring equipment and fed back to the control console. The control console determines whether the grouting strategy needs to be adjusted based on the feedback results, and further adjusts the position of the mobile grouting device, the size of the airbag, and the grouting parameters, forming a cycle of "monitoring-decision-grouting-re-monitoring" until the position of the pipe curtain steel pipe is corrected and the surrounding rock pressure retention effect meets the project requirements.

[0084] This application discloses a method for correcting deviation and maintaining pressure in shallow-buried tunnel pipe curtains based on mobile grouting. Firstly, it provides a mobile grouting device specifically designed for grouting the gap between the pipe curtain and the surrounding rock of the tunnel. This mobile grouting device can move along the pipe curtain to adjust the grouting position. During mobile grouting, the settlement value of the soil layer above the pipe curtain, the deviation coordinates of the pipe curtain, and the pressure of the surrounding rock within the pipe curtain soil layer are collected to determine the condition of the pipe curtain. Based on the pipe curtain condition, different grouting strategies are selected, providing scientifically effective grouting solutions for different situations. This application has advantages such as high grouting accuracy and fast response speed.

[0085] like Figure 8 As shown, this application also provides a shallow-buried tunnel pipe curtain correction and pressure maintenance system based on mobile grouting, comprising:

[0086] The data acquisition module is used to acquire the settlement value of the soil layer above the pipe curtain, the offset coordinates of the pipe curtain, and the pressure of the surrounding rock of the tunnel within the pipe curtain soil layer when the mobile grouting device is jacked along the gap between the pipe curtain and the tunnel surrounding rock.

[0087] The strategy selection module is used to determine the grouting strategy of the corresponding section of the pipe curtain based on the settlement value and the offset coordinate. The grouting strategy includes one or more combinations of grouting position, grouting volume, grouting pressure, grouting movement direction and grouting stop judgment conditions.

[0088] The control module is used to control the mobile grouting device to perform grouting based on the grouting strategy.

[0089] This application discloses a shallow-buried tunnel pipe curtain correction and pressure maintenance system based on mobile grouting. Firstly, it provides a mobile grouting device specifically designed for grouting the gap between the pipe curtain and the surrounding rock of the tunnel. This mobile grouting device can move along the pipe curtain to adjust the grouting position. During mobile grouting, the settlement value of the soil layer above the pipe curtain, the deviation coordinates of the pipe curtain, and the pressure of the surrounding rock within the pipe curtain soil layer are collected to determine the pipe curtain condition. Based on the pipe curtain condition, different grouting strategies are selected, providing scientifically effective grouting solutions for different situations. This application has advantages such as high grouting accuracy and fast response speed.

[0090] This embodiment also provides an electronic terminal, including: a processor and a memory;

[0091] The memory is used to store computer programs, and the processor is used to execute the computer programs stored in the memory so that the terminal performs any of the methods in this embodiment.

[0092] As will be understood by those skilled in the art, the computer-readable storage medium described in this embodiment allows for the implementation of all or part of the steps in the above method embodiments by computer program-related hardware. The aforementioned computer program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0093] The electronic terminal provided in this embodiment includes a processor, a memory, a transceiver, and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete communication between them. The memory is used to store computer programs, the communication interface is used to perform communication, and the processor and the transceiver are used to run the computer programs, so that the electronic terminal performs the steps of the above method.

[0094] In this embodiment, the memory may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.

[0095] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0096] In the above embodiments, although the present application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. The embodiments of the present application are intended to cover all such substitutions, modifications, and variations falling within the broad scope thereof.

[0097] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by this application.

Claims

1. A method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting, characterized in that, Including the following steps: When the mobile grouting device is controlled to advance along the gap between the pipe curtain and the surrounding rock of the tunnel, the settlement value of the soil layer above the pipe curtain, the offset coordinate of the pipe curtain, and the pressure of the surrounding rock of the tunnel in the soil layer of the pipe curtain are obtained. The grouting strategy for the corresponding section of the pipe curtain is determined based on the settlement value and the offset coordinates. The grouting strategy includes one or more combinations of grouting location, grouting volume, grouting pressure, grouting movement direction, and grouting stop judgment conditions. Grouting is performed by controlling a mobile grouting device based on the grouting strategy. The mobile grouting device includes a main body (1), a circumferential slide rail (2), a guide rod (3), a grouting pipe (4), and a pneumatic pipe (5). The circumferential slide rail (2) is attached to the top or bottom surface of the pipe curtain. The main body (1) and the circumferential slide rail (2) are in annular sliding cooperation and axial locking cooperation. The guide rod (3) cooperates with the main body (1) to drive the main body (1) to move along the circumferential slide rail (2) or drive the main body (1) and the circumferential slide rail (2) to move along their axis. The grouting pipe (4) and the pneumatic pipe (5) are fixed to the main body (1). One end of the grouting pipe (4) is a grouting nozzle (41), and the other end of the grouting pipe (4) is connected to an external grouting machine. One end of the pneumatic pipe (5) is provided with an airbag (51) for opening the gap, and the other end of the pneumatic pipe (5) is connected to an external air compressor.

2. The method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting according to claim 1, characterized in that, Determining the grouting strategy for the corresponding section of the pipe curtain based on the settlement value and the offset coordinates includes: The settlement value of each section of the pipe curtain is compared with the preset settlement threshold, and the deviation of each section of the pipe curtain is compared with the preset deviation threshold. The deviation is the distance between the designed midpoint and the actual midpoint of the pipe curtain. When the settlement value of the pipe curtain is less than the preset settlement threshold and the deviation of the pipe curtain is less than the preset deviation threshold, the pipe curtain is determined to be in an ideal state, and the first grouting strategy corresponding to the ideal state is selected and executed. When the settlement value of the pipe curtain is less than the preset settlement threshold and the deviation of the pipe curtain is greater than or equal to the preset deviation threshold, the pipe curtain is determined to be in a path deviation state, and the second grouting strategy corresponding to the path deviation state is selected and executed. When the settlement value of the pipe curtain is greater than or equal to the preset settlement threshold and the deviation of the pipe curtain is less than the preset deviation threshold, the pipe curtain is determined to be in a settlement state, and the third grouting strategy corresponding to the settlement state is selected and executed. When the settlement value of the pipe curtain is greater than or equal to the preset settlement threshold, and the deviation of the pipe curtain is greater than or equal to the preset deviation threshold, the second grouting strategy is executed first, and then the third grouting strategy is executed.

3. The method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting according to claim 2, characterized in that, The first grouting strategy includes: the circumferential grouting position is arbitrary, and the grouting volume is... The grouting pressure is The grouting movement direction is from the inside out. The surrounding rock pressure, of which, The void volume is the volume between the pipe curtain and the surrounding rock. The mathematical expression is: In the formula, This indicates the axial movement of the mobile grouting device. Indicates the tunnel diameter. Indicates the diameter of the tube curtain.

4. A method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting according to claim 2, characterized in that, The second grouting strategy includes: grouting at the point of minimum gap, and grouting volume of... The grouting pressure is The grouting movement direction is from the inside to the outside, and the minimum gap is determined based on the offset coordinate.

5. A method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting according to claim 2, characterized in that, The third grouting strategy includes: Phase 1: Grouting location is above the pipe curtain, grouting volume is... The grouting pressure is After grouting is completed, the settlement rate of the soil layer above the pipe curtain is extracted. When the settlement rate is less than the preset rate threshold, grouting is stopped. When the settlement rate is still greater than or equal to the preset rate threshold, the second stage of grouting is then carried out. Phase Two: Grouting pressure increased to... The cumulative grouting volume has increased to After grouting is completed, the settlement rate of the soil layer above the pipe curtain is extracted. When the settlement rate is less than the preset rate threshold, grouting is stopped. When the settlement rate is still greater than or equal to the preset rate threshold, the third stage of grouting is then carried out. Third stage: Control the mobile grouting device to move and grout within the expansion grouting range until the pressure inside the airbag reaches the required level. The grouting pressure is maintained at Grouting volume increased to ,in, This indicates the settlement value.

6. A method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting according to claim 5, characterized in that, Also includes: After the third stage of grouting is completed, the settlement rate of the soil layer above the pipe curtain is extracted. If the settlement rate is still greater than or equal to the preset rate threshold, a prompt message is output to prompt the verification of other settlement causes.

7. A method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting according to claim 1, characterized in that, The mobile grouting device also includes a control circuit and a drive device for driving the main body (1) to move along the annular slide rail (2). The control circuit and the drive device are both fixed to the main body (1). One end of the control circuit is connected to the drive device, and the other end of the control circuit is connected to an external control console.

8. A method for correcting deviation and maintaining pressure in shallow buried tunnel pipe curtain based on mobile grouting according to claim 1, characterized in that, Controlling the mobile grouting device to perform grouting based on the grouting strategy includes: The guide rod (3) drives the main body (1) and the circumferential slide rail (2) to slide along the pipe curtain axis until they reach the axial grouting position in the grouting strategy. When circumferential sliding is required in the grouting strategy, the main body (1) is controlled to move along the circumferential slide rail (2) to the circumferential grouting position; The air compressor is controlled to inject gas into the air bag along the air pressure pipe (5) to fill the gap; The grouting machine is controlled to input the grouting material along the grouting pipe (4) to the grouting nozzle (41), and the grouting is applied to the gap through the grouting nozzle (41).

9. A method for correcting deviation and maintaining pressure in shallow-buried tunnel pipe curtain based on mobile grouting according to claim 1, characterized in that, After controlling the mobile grouting device to perform grouting based on the grouting strategy, the method further includes: The settlement value of the soil layer above the pipe curtain, the offset coordinates of the pipe curtain, and the tunnel surrounding rock pressure within the soil layer of the pipe curtain are obtained. The grouting strategy for the corresponding section of the pipe curtain is then determined based on the settlement value and the offset coordinates.

10. A shallow-buried tunnel pipe curtain correction and pressure maintenance system based on mobile grouting, characterized in that, include: The data acquisition module is used to acquire the settlement value of the soil layer above the pipe curtain, the offset coordinates of the pipe curtain, and the pressure of the surrounding rock of the tunnel within the pipe curtain soil layer when the mobile grouting device is jacked along the gap between the pipe curtain and the tunnel surrounding rock. The strategy selection module is used to determine the grouting strategy of the corresponding section of the pipe curtain based on the settlement value and the offset coordinate. The grouting strategy includes one or more combinations of grouting position, grouting volume, grouting pressure, grouting movement direction and grouting stop judgment conditions. A control module is used to control a mobile grouting device to perform grouting based on the grouting strategy. The mobile grouting device includes a main body (1), a circumferential slide rail (2), a guide rod (3), a grouting pipe (4), and a pneumatic pipe (5). The circumferential slide rail (2) is attached to the top or bottom surface of the pipe curtain. The main body (1) and the circumferential slide rail (2) are in annular sliding cooperation and axial locking cooperation. The guide rod (3) cooperates with the main body (1) to drive the main body (1) to move along the circumferential slide rail (2) or drive the main body (1) and the circumferential slide rail (2) to move along their axis. The grouting pipe (4) and the pneumatic pipe (5) are fixed to the main body (1). One end of the grouting pipe (4) is a grouting nozzle (41), and the other end of the grouting pipe (4) is connected to an external grouting machine. One end of the pneumatic pipe (5) is provided with an airbag (51) for opening the gap, and the other end of the pneumatic pipe (5) is connected to an external air compressor.

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