A dynamic grouting method and system for a tunnel lining

Abstract

The application discloses a dynamic perfusion method and system for tunnel lining, which is characterized by the following steps: a longitudinal perfusion pipe is arranged at the center of the tunnel vault, and a slurry preparation cylinder is connected with the perfusion pipe through a perfusion pump; before the lining layer is solidified, the perfusion pump transports standard concentration slurry with a set concentration range through the perfusion pipe to perform vault cavity perfusion; when the perfusion pressure is lower than the set range, high-concentration slurry is put into the slurry preparation cylinder to be mixed with the standard concentration slurry to increase the slurry concentration to the set range; when the perfusion pressure is higher than the set range, clean water is put into the slurry preparation cylinder to be mixed with the standard concentration slurry to decrease the slurry concentration to the set range; and when the perfusion pressure reaches the set upper limit value, the perfusion is stopped. The method and system can solve the problems of slurry leakage, perfusion pipe and pipe outside blockage in the perfusion process, effectively improve the filling rate of cavity perfusion, and improve the perfusion construction effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, and particularly provides a dynamic grouting method and system for tunnel lining. BACKGROUND

[0002] In some tunnel excavation constructions, the tunnel excavation profile is uneven, and the void between the tunnel lining concrete and the tunnel usually occurs at the vault and other parts. The high possibility of lining concrete cracks, peeling and spalling and other phenomena reduces the bearing capacity of the lining structure and shortens the service life of the lining. Therefore, after the concrete is poured, cement slurry needs to be grouted between the concrete and the tunnel vault to fill the void and increase the bonding force between the concrete and the tunnel vault.

[0003] The conventional tunnel lining grouting technology has the following technical problems: in the grouting process, different void sizes cause large changes in grouting pressure, and the existing grouting technology uses cement slurry with unchanged concentration for pouring the concrete and the tunnel vault, which cannot adjust the concentration of the cement slurry in a timely manner with the grouting pressure, and is prone to slurry leakage and blockage. Although workers manually add cement powder to the mixing container to adjust the concentration of the cement slurry at the construction site, this method cannot continuously adjust the concentration according to the continuous change in the grouting pressure, and cannot achieve good adjustment effect. In addition, the powdered cement directly enters the mixing container for stirring, the concentration of the cement slurry changes greatly, the concentration of the cement slurry cannot be accurately controlled, and the cement powder cannot be fully wetted for a long time and fully mixed into the cement slurry, forming a mass, causing blockage of the grouting pipe and the space near the grouting pipe, and making the grouting unable to continue. SUMMARY

[0004] Based on the above technical problems, the present application provides a dynamic grouting method and system for tunnel lining, which can detect the grouting pressure in real time, adjust the slurry concentration in real time according to the change in the grouting pressure, solve the problems of slurry leakage, grouting pipe and pipe blockage during grouting, and effectively improve the filling rate of the cavity grouting and the grouting construction effect.

[0005] To achieve the above purpose, in a first aspect, the present application provides a dynamic grouting method for tunnel lining, comprising:

[0006] S10. Before tunnel lining, a grouting pipe is fixedly arranged at the center of the tunnel vault in the longitudinal direction, the grouting pipe is arranged with grouting holes in the length direction, and a slurry configuration cylinder is connected with the grouting pipe through a grouting pump;

[0007] S20. The slurry configuration cylinder is configured with standard concentration slurry, and after the tunnel lining, the grouting pump delivers the configured standard concentration slurry to the grouting pipe before the lining layer solidifies, and performs vault cavity grouting.

[0008] S30. In the process of pouring into the vault cavity, the concentration of the slurry is dynamically adjusted according to the pouring pressure, including:

[0009] S31. When the pouring pressure is lower than the set range, high-concentration slurry is added to the slurry preparation cylinder, and the high-concentration slurry is mixed with the standard-concentration slurry to increase the concentration of the slurry until the pouring pressure rises to the set range.

[0010] S32. When the pouring pressure is higher than the set range, clean water is added to the slurry preparation cylinder, and the clean water is mixed with the standard-concentration slurry to decrease the concentration of the slurry until the pouring pressure decreases to the set range.

[0011] S40. When the pouring pressure rises to the set upper limit, the pouring is stopped.

[0012] In some preferred technical solutions, a mixing chamber is arranged in the slurry preparation cylinder, and a high-concentration slurry chamber is connected to the input end of the mixing chamber. The output end of the mixing chamber is connected to the pouring pipe. Standard-concentration slurry is arranged in the mixing chamber, and high-concentration slurry is arranged in the high-concentration slurry chamber. During the pouring process, when the pouring pressure is lower than the set range, the arranged high-concentration slurry is transported to the mixing chamber, and the high-concentration slurry is mixed with the standard-concentration slurry to increase the concentration of the slurry in the mixing chamber.

[0013] In some preferred technical solutions, a first clean water supply pipe is connected to the input end of the mixing chamber. During the pouring process, when the pouring pressure is higher than the set range, clean water is transported to the mixing chamber through the first clean water supply pipe, and the clean water is mixed with the standard-concentration slurry to decrease the concentration of the slurry in the mixing chamber.

[0014] In some preferred technical solutions, the delivery speed of the pouring pump is adjustable. During the pouring process, when the pouring pressure is higher than the set range, the delivery speed of the slurry is decreased, and when the pouring pressure is lower than the set range, the delivery speed of the slurry is increased.

[0015] In some preferred technical solutions, a second clean water supply pipe is connected to the pouring pipe. Before pouring, clean water is transported to the pouring pipe through the second clean water supply pipe to dredge the pouring pipe and the outside of the pipe.

[0016] In some preferred technical solutions, during the pouring process, when the pouring pressure is higher than the set upper limit for a short time, clean water is transported to the pouring pipe through the second clean water supply pipe to dredge the pouring pipe and the outside of the pipe, and low-concentration slurry is poured after dredging.

[0017] In order to achieve the above-mentioned purpose, the second aspect of the present application provides a dynamic grouting system for tunnel lining, comprising a slurry preparation cylinder, a grouting pump and a grouting pipe; the slurry preparation cylinder is provided with a stirring mixing chamber, a high-concentration slurry chamber and a first clean water supply pipe; the high-concentration slurry chamber is connected with the input end of the stirring mixing chamber through a first flow control valve, and the first clean water supply pipe is connected with the input end of the stirring mixing chamber through a first on-off valve; the output end of the stirring mixing chamber is connected with the grouting pipe through the grouting pump; the grouting pipe extends longitudinally along the center of the tunnel vault and is provided with grouting holes arranged in an array; and a pressure sensor for detecting grouting pressure is arranged between the grouting pump and the grouting pipe.

[0018] In some preferred technical solutions, the grouting pump is a variable pump, the supply system is provided with a flow adjusting unit connected with the control of the grouting pump, the pressure sensor is signal-connected with the flow adjusting unit, and the flow adjusting unit is configured to reduce the slurry delivery speed when the grouting pressure is higher than the set range and to increase the slurry delivery speed when the grouting pressure is lower than the set range.

[0019] In some preferred technical solutions, the supply system is provided with a concentration adjusting unit connected with the control of the first flow control valve and the first on-off valve, the pressure sensor is signal-connected with the concentration adjusting unit, and the concentration adjusting unit is configured to,

[0020] when the grouting pressure is lower than the set range, control the first flow control valve to open, and the high-concentration slurry chamber to deliver high-concentration slurry to the stirring mixing chamber;

[0021] when the grouting pressure is higher than the set range, control the first on-off valve to open, and deliver clean water to the stirring mixing chamber.

[0022] In some preferred technical solutions, the grouting system is provided with a second clean water supply pipe connected with the grouting pipe through a second on-off valve.

[0023] Now for the prior art, the technical effects of the dynamic grouting method and system for tunnel lining provided by the present application are:

[0024] In the first aspect, in the grouting process, the grouting pressure is detected in real time, and the concentration of the slurry is continuously adjusted according to the comparison between the grouting pressure and the set range; when the grouting pressure is small, the concentration of the cement slurry is increased in real time to prevent slurry leakage; when the grouting pressure is large, the concentration of the cement slurry is decreased in real time to prevent the grouting pipe from being blocked, effectively improving the grouting rate of the cavity and improving the grouting quality;

[0025] In the second aspect, the standard concentration slurry and the high concentration slurry are configured, the standard concentration slurry is mainly used in the grouting process, when the concentration of the slurry needs to be increased, the high concentration slurry is mixed with the standard concentration slurry, instead of directly adding the powdered cement into the standard concentration slurry, so that the concentration can be accurately controlled, and the cement powder cannot be fully wetted and mixed into the standard concentration slurry in a short time to form a coagulation mass. The high concentration slurry improves the plugging effect and timely solves the slurry leakage problem, and improves the grouting quality.

[0026] In the third aspect, the second water supply pipe is used to dredge when the grouting is blocked before and during the grouting, so as to provide conditions for the grouting. When the grouting pressure is higher than the set range during the grouting process, the first water supply pipe is used to supply water to the standard concentration slurry, so as to reduce the concentration of the slurry, so as to dredge the grouting pipe and the area outside the pipe, avoid blockage and improve the grouting rate of the cavity.

[0027] In the fourth aspect, the grouting pipe is arranged along the center of the vault in the longitudinal direction, and the grouting holes are arranged in the length direction, so that the single-trip grouting pipe can complete the grouting of the cavity with the entire longitudinal length, the range and continuity of the grouting are improved, the problems of slurry stringing and backflow are avoided, the grouting can be stopped in time when the grouting requirement is met, and the grouting effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below in detail with reference to the drawings and specific implementation methods. The drawings described herein are used to provide further understanding of the application, and form a part of the application. The schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application.

[0029] Figure 1 A flow chart of an embodiment of the provided dynamic grouting method of a tunnel lining.

[0030] Figure 2 A structural schematic diagram of an embodiment of the provided dynamic grouting system of a tunnel lining.

[0031] Figure 3 A structural schematic diagram of an embodiment of the provided slurry configuration cylinder.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1-slurry configuration cylinder, 11-mixing chamber, 12-high concentration slurry chamber, 13-first flow control valve, 14-intermediate partition plate, 15-stirring paddle, 16-shutter, 17-conveying hole, 18-motor;

[0034] 2-grouting pump;

[0035] 3-grouting pipe, 31-grouting hole;

[0036] 4 - first clear water supply pipe, 41 - first on-off valve;

[0037] 5 - second clear water supply pipe, 51 - second on-off valve;

[0038] 6 - pressure sensor;

[0039] 7 - flow regulating unit;

[0040] 8 - concentration regulating unit;

[0041] 9 - vault center;

[0042] 10 - lining layer. DETAILED DESCRIPTION

[0043] In tunnel construction, after pouring concrete, cement slurry needs to be injected between the concrete and the tunnel vault to fill the void and increase the bonding force between the concrete and the tunnel vault. In the conventional tunnel lining grouting technology, a cement slurry with constant concentration is used to pour the concrete and the tunnel vault during the injection process, which cannot adjust the concentration of the cement slurry in a timely manner with the injection pressure, and is prone to slurry leakage and blockage. Although workers manually add cement powder to the mixing container to adjust the concentration of the cement slurry at the construction site, the concentration of the cement slurry changes greatly when the powdered cement is directly added to the mixing container for stirring, which cannot accurately control the concentration of the cement slurry, and is prone to form lumps, causing blockage of the injection pipe and the space near the injection pipe, making the injection process unable to continue.

[0044] To solve the above problems, the present application provides a dynamic injection method and system for tunnel lining, which sets a longitudinally arranged injection pipe at the center of the tunnel vault, and a slurry configuration cylinder is connected to the injection pipe through an injection pump; before the lining layer solidifies, the injection pump transports standard concentration slurry with a set concentration range through the injection pipe to perform vault cavity injection; when the injection pressure is lower than the set range, high-concentration slurry is added to the slurry configuration cylinder to mix with the standard concentration slurry, increasing the concentration of the slurry to the set range; when the injection pressure is higher than the set range, clear water is added to the slurry configuration cylinder to mix with the standard concentration slurry, reducing the concentration of the slurry to the set range; when the injection pressure reaches the set upper limit, the injection is stopped. This method and system can solve the problems of slurry leakage, grouting pipe and pipe blockage during the injection process, effectively improve the filling rate of cavity injection and improve the grouting construction effect.

[0045] Specific embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and are not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting of the application or its applications or uses. The relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments are not limitations on the scope of the application unless otherwise specifically stated.

[0046] As Figure 1 The present application provides a dynamic perfusion method for tunnel lining, comprising:

[0047] S10. Before tunnel lining, a perfusion pipe 3 is fixedly arranged at the longitudinal direction of the center of the tunnel vault 9, the perfusion pipe 3 is arranged with perfusion holes 31 in the length direction, and the slurry preparation cylinder 1 is connected with the perfusion pipe 3 through the perfusion pump 2;

[0048] S20. The slurry preparation cylinder 1 is configured with standard concentration slurry, after tunnel lining, before the setting of the lining layer 10, the perfusion pump 2 delivers the configured standard concentration slurry to the perfusion pipe 3, and perfusion of the vault cavity is performed;

[0049] S30. In the process of perfusion of the vault cavity, the slurry concentration is dynamically adjusted according to the perfusion pressure, comprising:

[0050] S31. When the perfusion pressure is lower than the set range, high-concentration slurry is added to the slurry preparation cylinder 1, the high-concentration slurry is mixed with the standard concentration slurry, the slurry concentration is increased, and the perfusion pressure is increased to the set range;

[0051] S32. When the perfusion pressure is higher than the set range, clean water is added to the slurry preparation cylinder 1, the clean water is mixed with the standard concentration slurry, the slurry concentration is reduced, and the perfusion pressure is reduced to the set range;

[0052] S40. When the perfusion pressure is increased to the set upper limit value, the perfusion is stopped.

[0053] As Figure 2As shown, in order to realize the above-mentioned dynamic grouting method for tunnel lining, the dynamic grouting system for tunnel lining provided by the present invention includes a grout preparation cylinder 1, a grouting pump 2, and a grouting pipe 3; the grout preparation cylinder 1 is provided with a mixing chamber 11, a high-concentration grout chamber 12, and a first clean water supply pipe 4; the high-concentration grout chamber 12 is connected to the input end of the mixing chamber 11 through a first flow control valve 13, the first clean water supply pipe 4 is connected to the input end of the mixing chamber 11 through a first switching valve 41, and the output end of the mixing chamber 11 is connected to the grouting pipe 3 through the grouting pump 2; the grouting pipe 3 extends longitudinally along the center 9 of the tunnel arch and is arranged in an array with grouting holes 31, and a pressure sensor 6 for detecting grouting pressure is provided between the grouting pump 2 and the grouting pipe 3.

[0054] In the specific implementation process, a mixing chamber 11 and a high-concentration slurry chamber 12 connected to the input end of the mixing chamber 11 are provided in the slurry preparation cylinder 1. The output end of the mixing chamber 11 is connected to the injection pipe 3. Standard concentration slurry is prepared in the mixing chamber 11 and high-concentration slurry is prepared in the high-concentration slurry chamber 12. During the injection process, when the injection pressure is lower than the set range, the prepared high-concentration slurry is transported to the mixing chamber 11. The high-concentration slurry mixes with the standard concentration slurry to increase the slurry concentration in the mixing chamber 11.

[0055] Furthermore, a first clean water supply pipe 4 is connected to the input end of the mixing chamber 11. During the injection process, when the injection pressure is higher than the set range, clean water is supplied to the mixing chamber 11 through the first clean water supply pipe 4. The clean water is mixed with the standard concentration slurry to reduce the slurry concentration in the mixing chamber 11.

[0056] The provided dynamic grouting method and system for tunnel lining involves grouting pipes arranged longitudinally along the center of the arch, with grouting holes arrayed along the length. A single grouting pipe run can complete the grouting of the entire longitudinal cavity, improving the grouting range and continuity. During the grouting process, the grouting pressure is monitored in real time, and the grout concentration is continuously adjusted based on the comparison between the grouting pressure and the set range to prevent grouting pipe blockage, effectively improving the cavity grouting rate and grouting quality. When a higher grout concentration is required, the high-concentration grout is mixed with the standard-concentration grout instead of directly adding powdered cement to the standard-concentration grout. This not only facilitates precise control of the concentration adjustment but also avoids agglomeration. The high-concentration grout improves the sealing effect and promptly resolves grout leakage problems.

[0057] like Figure 2 As shown, in some preferred embodiments, the delivery speed of the injection pump 2 is adjustable. During the injection process, when the injection pressure is higher than the set range, the slurry delivery speed is reduced, and when the injection pressure is lower than the set range, the slurry delivery speed is increased.

[0058] Furthermore, the injection pump 2 is a variable pump, and the supply system is equipped with a flow regulating unit 7 that is controlled and connected to the injection pump 2. The pressure sensor 6 is signal-connected to the flow regulating unit 7. The flow regulating unit 7 is configured to reduce the slurry delivery speed when the injection pressure is higher than the set range, and increase the slurry delivery speed when the injection pressure is lower than the set range.

[0059] In this preferred embodiment, the injection pump is controlled by a flow regulation unit to control the flow rate of the slurry during the injection process. When the injection pressure is higher than the set range, the slurry delivery speed is reduced, and when the injection pressure is lower than the set range, the slurry delivery speed is increased, thereby achieving a reasonable combination of injection pressure and slurry delivery speed and improving injection efficiency.

[0060] like Figure 2 As shown, the injection system is equipped with a second clean water supply pipe 5, which is connected to the injection pipe 3 via a second switch valve 51. Before injection, clean water is supplied to the injection pipe 3 through the second clean water supply pipe 5 to clear the blockages in the injection pipe 3 and the surrounding area. Furthermore, during the injection process, if the injection pressure briefly exceeds the set upper limit, clean water is supplied to the injection pipe 3 through the second clean water supply pipe 5 to clear the blockages in the injection pipe 3 and the surrounding area. After clearing the blockages, a low-concentration slurry is injected.

[0061] In this preferred embodiment, the second clean water supply pipe is used to clear blockages before and during grouting, thereby enhancing the continuity of grouting. During grouting, when the grouting pressure is higher than the set range, clean water is supplied to the standard concentration slurry through the first clean water supply pipe to reduce the slurry concentration, thereby clearing the grouting pipe and the area outside the pipe, avoiding blockages, and improving the grouting rate of the cavity.

[0062] like Figure 2 As shown, the supply system is equipped with a concentration adjustment unit 8 that is controlled and connected to the first flow control valve 13 and the first switching valve 41. The pressure sensor 6 is signal-connected to the concentration adjustment unit 8. The concentration adjustment unit 8 is configured to: control the first flow control valve 13 to open when the injection pressure is lower than the set range, so that the high-concentration slurry chamber 12 delivers high-concentration slurry to the mixing chamber 11; and control the first switching valve 41 to open when the injection pressure is higher than the set range, so that clean water is delivered to the mixing chamber 11.

[0063] In this preferred embodiment, the concentration adjustment unit receives the injection pressure signal and controls the first flow control valve and the first switching valve to adjust the slurry concentration according to the injection pressure, automatically completing the dynamic adjustment of the injection and improving the injection quality.

[0064] like Figure 3As shown, in some preferred embodiments, the slurry configuration cylinder 1 is divided into an upper and lower spaced high concentration slurry chamber 12 and a mixing chamber 11 by a middle partition 14; wherein the high concentration slurry chamber 12 is used for mixing and storing high concentration cement slurry, and the mixing chamber 11 is used for mixing and storing standard concentration slurry; the stirring paddle 15 driven by the motor 18 passes through the middle partition 14, and the stirring paddle 15 is provided with first stirring blades in the mixing chamber 11 and second stirring blades in the high concentration slurry chamber; the mixing chamber is connected with the first clean water supply pipe 4 through the first switch valve 41; the middle partition 14 is provided with a delivery hole 17 blocked by a gate 16, and the gate 16 is connected with a switch-driven linear cylinder to control the opening size of the delivery hole 17 by driving the gate 16 to act through the linear cylinder, thereby controlling the delivery of cement slurry from the high concentration slurry chamber 12 to the mixing chamber 11.

[0065] As shown in Figure 2 , the mixing chamber 11 is connected with the grouting pipe 3 through the grouting pump 2, the pressure sensor 6 is arranged on the grouting pipe 3 and is used for detecting the grouting pressure of the cement slurry, the pressure sensor 6 is signal connected with the flow regulating unit 7 and the concentration regulating unit 8, the flow regulating unit 7 is control connected with the grouting pump 2, and the concentration regulating unit 8 is control connected with the first flow control valve 13 and the first switch valve.

[0066] As shown in Figure 1 and Figure 2 , the working process of using the slurry configuration cylinder 1 to configure and grout the slurry is as follows:

[0067] First, a certain proportion of cement powder and water is put into the high concentration slurry chamber 12, and the standard concentration slurry is formed by stirring, the delivery hole 17 is opened, the standard concentration slurry is delivered to the mixing chamber, and the delivery hole is closed.

[0068] Then, more than a certain proportion of cement powder and water is put into the high concentration slurry chamber 12, and the high concentration slurry is formed by stirring;

[0069] Then, the grouting pump 2 delivers the standard concentration slurry to the gap between the lining layer 10 and the tunnel vault center 9 through the grouting pipe 3, and during this period, the motor 18 drives the stirring paddle 15 to continuously stir the slurry in the mixing chamber 11 and the high concentration slurry chamber 12.

[0070] When the grouting pressure is lower than the set range, the delivery hole 17 is opened, the high concentration slurry chamber 12 adds high concentration slurry to the mixing chamber 11, the high concentration slurry is mixed with the standard concentration slurry, the concentration of the slurry is increased, and the grouting pressure is increased to the set range.

[0071] When the perfusion pressure is higher than the set range, the first switch valve 41 is opened, the first clean water supply pipe 4 adds clean water to the slurry arrangement cylinder 1, the clean water is mixed with the standard concentration slurry, the slurry concentration is reduced, and the perfusion pressure is reduced to the set range;

[0072] During perfusion, when the perfusion pressure is higher than the set upper limit for a short time, clean water is transported to the perfusion pipe 3 through the second clean water supply pipe 5, the perfusion pipe 3 and the pipe outside are dredged, and after dredging, low-concentration slurry is perfused, and when the perfusion pressure continues to rise to the set upper limit value, the perfusion is stopped.

[0073] In the above embodiments, the non-shrinking slurry material ratio is determined by experiment. The non-shrinking slurry material should have the characteristics of high fluidity, early strength, no bleeding, and shrinkage rate less than 2%, and meet the physical and mechanical performance index of the lining concrete cementitious material after final setting. Preferably, the water-cement ratio of the slurry material is 0.35-0.40, the water reducing agent content is 0.004-0.006, and the fluidity is 250mm-290mm. Other non-shrinking slurry materials can also be used.

[0074] It should be noted that the above figures and specific embodiments are only used to illustrate the present application, and the present application is not limited thereto. Subtle changes to the present application within the spirit and scope of the application defined by the claims of the present application fall within the protection scope of the present application.

Claims

1. A dynamic grouting method for tunnel lining, a grouting system for implementing the method comprising a slurry preparation cylinder (1), a grouting pump (2) and a grouting pipe (3); the slurry preparation cylinder (1) is provided with a mixing chamber (11), a high-concentration slurry chamber (12) and a first clean water supply pipe (4); the high-concentration slurry chamber (12) is connected with the input end of the mixing chamber (11) through a first flow control valve (13), the first clean water supply pipe (4) is connected with the input end of the mixing chamber (11) through a first on-off valve (41), and the output end of the mixing chamber (11) is connected with the grouting pipe (3) through the grouting pump (2); the grouting pipe (3) extends longitudinally along the tunnel vault center (9) and is provided with grouting holes (31) arranged in an array, and a pressure sensor (6) for detecting grouting pressure is arranged between the grouting pump (2) and the grouting pipe (3); the grouting system is provided with a second clean water supply pipe (5), and the second clean water supply pipe (5) is connected with the grouting pipe (3) through a second on-off valve (51); characterized in that: S10. Before tunnel lining, the grouting pipe (3) is fixedly arranged longitudinally along the tunnel vault center (9), the grouting pipe (3) is provided with grouting holes (31) arranged in an array along the length direction, and the slurry preparation cylinder (1) is connected with the grouting pipe (3) through the grouting pump (2); S20. The slurry preparation cylinder (1) is configured with standard-concentration slurry, after tunnel lining, before the lining layer (10) solidifies, the grouting pump (2) delivers the configured standard-concentration slurry to the grouting pipe (3) to perform vault cavity grouting; S30. During the vault cavity grouting, the slurry concentration is dynamically adjusted according to the grouting pressure, including: S31. When the grouting pressure is lower than a set range, high-concentration slurry is added to the slurry preparation cylinder (1), the high-concentration slurry is mixed with the standard-concentration slurry, the slurry concentration is increased, and the grouting pressure is increased to the set range; S32. When the grouting pressure is higher than the set range, clean water is added to the slurry preparation cylinder (1), the clean water is mixed with the standard-concentration slurry, the slurry concentration is decreased, and the grouting pressure is decreased to the set range; S40. When the grouting pressure is increased to a set upper limit value, the grouting is stopped.

2. A method of dynamic infusion of a tunnel lining according to claim 1, characterised in that: The delivery speed of the grouting pump (2) is adjustable, during the grouting, when the grouting pressure is higher than the set range, the slurry delivery speed is decreased, and when the grouting pressure is lower than the set range, the slurry delivery speed is increased.

3. The method of dynamic infusion of a tunnel lining according to claim 1, characterized in that: When the grouting pipe (3) is connected with the second clean water supply pipe (5), before grouting, clean water is delivered to the grouting pipe (3) through the second clean water supply pipe (5) to dredge the grouting pipe (3) and the outside of the pipe.

4. A method of dynamic infusion of a tunnel lining according to claim 3, characterised in that: During the grouting, when the grouting pressure is higher than the set upper limit value for a short time, clean water is delivered to the grouting pipe (3) through the second clean water supply pipe (5) to dredge the grouting pipe (3) and the outside of the pipe, and low-concentration slurry is grouted after dredging.

5. The dynamic grouting method for tunnel lining according to claim 1, characterized in that: The perfusion pump (2) is a variable pump, the perfusion system is provided with a flow regulating unit (7) in control connection with the perfusion pump (2), the pressure sensor (6) is in signal connection with the flow regulating unit (7), and the flow regulating unit (7) is configured to reduce the slurry conveying speed when the perfusion pressure is higher than the set range and to increase the slurry conveying speed when the perfusion pressure is lower than the set range.

6. The method of dynamic infusion of a tunnel lining according to claim 1, characterized in that: The perfusion system is provided with a concentration regulating unit (8) in control connection with the first flow control valve (13) and the first on-off valve (41), the pressure sensor (6) is in signal connection with the concentration regulating unit (8), and the concentration regulating unit (8) is configured to control the first flow control valve (13) to open when the perfusion pressure is lower than the set range, so that the high-concentration slurry chamber (12) conveys high-concentration slurry to the stirring and mixing chamber (11); and to control the first on-off valve (41) to open when the perfusion pressure is higher than the set range, so that clean water is conveyed to the stirring and mixing chamber (11).

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