Decision-making method and system for reasonable formwork removal opportunity of tunnel secondary lining concrete

Abstract

The invention relates to the technical field of tunnel lining concrete and underground engineering, and provides a decision-making method and system for the reasonable formwork removal opportunity of tunnel secondary lining concrete.The method comprises the steps that mechanical parameters of the lining concrete are obtained; establishing a load-structure numerical calculation model, inputting the mechanical parameters of the lining concrete into the numerical calculation model, and performing trial loading on the numerical calculation model to obtain the ultimate bearing capacity of the lining concrete at different curing ages; determining a first lining concrete safety coefficient of the lining concrete at different curing ages; determining a second lining concrete safety coefficient of the lining concrete according to the safety critical value of the lining concrete; the first lining concrete safety coefficient and the second lining concrete safety coefficient are compared, and the reasonable formwork removal opportunity range of the lining is determined according to the comparison result; and according to the reasonable lining formwork removal opportunity range and the lining temperature drop range, the lining formwork removal opportunity is determined. The form removal time determined by the method is high in accuracy, high in safety and high in applicability.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel lining concrete and underground engineering, and in particular to a decision method and system for reasonable demoulding timing of tunnel secondary lining concrete. Background Art

[0002] The traditional solution is usually to move the test blocks cured under the same conditions on site to the laboratory for compression testing in a timely manner before each demolding. Especially when the tunnel is very deep, it is more inconvenient to transport the test blocks out, which does not meet the actual tight conditions on the construction site. Secondly, although it is not necessary to conduct compression tests on the test pieces cured under the same conditions before each demolding, the gradient change of the ambient temperature in the tunnel with the construction mileage is ignored, and the ambient temperature may vary greatly at different tunnel construction sites. Therefore, the relationship between the compressive strength fcu and time h under the same conditions obtained in a certain construction section may not be applicable to all tunnels with the same mix ratio and all mileage sections of the same tunnel.

[0003] Moreover, although the traditional scheme makes certain adjustments for temperature, it does not take into account the redundancy of lining strength, that is, the secondary lining can help bear part of the load, and the main data comes from laboratory data, which has poor affinity with the site. Summary of the invention

[0004] The purpose of the present invention is to solve at least one technical problem in the background technology and to provide a decision method and system for reasonable demoulding timing of tunnel secondary lining concrete.

[0005] To achieve the above object, the present invention provides a decision method for a reasonable time to remove the formwork of a tunnel secondary lining concrete, comprising:

[0006] According to the on-site lining concrete mix ratio and curing conditions, indoor curing test of tunnel lining concrete is carried out, and the time course curve that can reflect the mechanical parameters of lining concrete is obtained through the curing test;

[0007] Establish a load-structure numerical calculation model, input the mechanical parameters of the lining concrete into the numerical calculation model, and test load the numerical calculation model to obtain the ultimate bearing capacity of the lining concrete at different curing ages;

[0008] Determine the first lining concrete safety factor of lining concrete at different curing ages;

[0009] According to the safety critical value of lining concrete, determine the second lining concrete safety factor of lining concrete;

[0010] The first lining concrete safety factor and the second lining concrete safety factor are compared, and a reasonable time for removing the formwork for the lining is determined according to the comparison result.

[0011] According to one aspect of the present invention, the mechanical parameters of the lining concrete include: compressive strength of the lining concrete, tensile strength of the lining concrete and elastic modulus of the lining concrete.

[0012] According to one aspect of the present invention, the determining of the first lining concrete safety factor of the lining concrete at different curing ages includes:

[0013] Real-time monitoring of the contact pressure between the initial support concrete and the secondary lining concrete at different curing ages;

[0014] Calculate the ratio of the ultimate bearing capacity of the lining concrete to the contact pressure between the initial support concrete and the secondary lining concrete at different curing ages, so as to determine the safety factor of the first lining concrete at different curing ages.

[0015] According to one aspect of the present invention, the first lining concrete safety factor ξ of the lining concrete with a curing age of n days is:

[0016]

[0017] in, is the ultimate bearing capacity of lining concrete with a curing age of n days; It is the real-time monitoring value of the contact pressure between the initial support concrete and the secondary lining concrete.

[0018] According to one aspect of the present invention, the second lining concrete safety factor ξ of the lining concrete is determined according to the safety critical value of the lining concrete. A for:

[0019]

[0020] Where A is the ratio of the monitoring value between the monitoring platform used to monitor the contact pressure and the secondary lining concrete that does not exceed the bearing capacity of the secondary lining concrete, which is the safety critical value.

[0021] According to one aspect of the present invention, the first lining concrete safety factor and the second lining concrete safety factor are compared, and the reasonable time for lining formwork removal is determined according to the comparison result:

[0022] The calculated safety factor of the first lining concrete at different curing ages is compared with the safety factor of the second lining concrete. When the safety factor of the first lining concrete at a certain curing age is not lower than the safety factor of the second lining concrete, the curing age of the lining at this time is the reasonable time to remove the formwork of the lining.

[0023] To achieve the above object, the present invention also provides a decision system for the reasonable time of demoulding of secondary lining concrete of a tunnel, comprising:

[0024] The lining concrete mechanical parameter acquisition module conducts indoor tunnel lining concrete curing tests based on the on-site lining concrete mix ratio and curing conditions, and obtains the time-course change curve that can reflect the lining concrete mechanical parameters through the curing test;

[0025] The ultimate bearing capacity calculation module establishes a load-structure numerical calculation model, inputs the mechanical parameters of the lining concrete into the numerical calculation model, and performs test loading on the numerical calculation model to obtain the ultimate bearing capacity of the lining concrete at different curing ages;

[0026] The first lining concrete safety factor calculation module determines the first lining concrete safety factor of the lining concrete at different curing ages;

[0027] A second lining concrete safety factor calculation module, which determines the second lining concrete safety factor of the lining concrete according to the safety critical value of the lining concrete;

[0028] The demolding timing decision module compares the first lining concrete safety factor with the second lining concrete safety factor, and determines a reasonable demolding timing for the lining according to the comparison result.

[0029] To achieve the above-mentioned purpose, the present invention also provides an electronic device, including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the decision method for the reasonable time of demolding the secondary lining concrete of the tunnel as described above.

[0030] To achieve the above objectives, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the decision method for the reasonable time to demold the secondary lining concrete of the tunnel as described above is implemented.

[0031] According to the scheme of the present invention, the present invention considers the safety critical value by drawing on the determination method of the ratio of surrounding rock pressure shared by the initial support and secondary lining of the tunnel; by considering the lining temperature change curve, combining the safety factor and the safety critical value to determine the reasonable timing of lining demolding, the present invention can improve the construction quality, speed up the construction progress, improve the operation of the template trolley, reduce the construction cost, ensure the structural safety and reduce the temperature cracks by determining the reasonable timing of secondary lining demolding. Because demolding too early may cause lining cracking, settlement deformation and structural instability, increasing maintenance costs; while demolding too late will extend the construction period, reduce the efficiency of template use, and increase construction costs.

[0032] According to the solution of the present invention, the timing of demoulding determined by the present invention is highly accurate: the data comes from field tests, numerical simulations, and field tests, and the data are highly linked and mutually verified;

[0033] The timing of demoulding determined by the present invention is highly safe: it takes into account the safety critical value, lining hydration heat and concrete temperature shrinkage cracking in actual construction, so it is highly safe;

[0034] The demoulding timing determined by the present invention has strong applicability: starting from the actual situation on site, considering the actual construction situation on site, and taking the on-site data as the first-hand data and the final judgment basis. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A flowchart schematically showing a method for deciding a reasonable time to remove formwork for secondary lining concrete of a tunnel according to an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of the time-course variation curve of the compressive strength of lining concrete;

[0037] Figure 3 It is a schematic diagram of the time-course variation curve of the tensile strength of lining concrete;

[0038] Figure 4 It is a schematic diagram of the time-course variation curve of the elastic modulus of lining concrete;

[0039] Figure 5 It is a schematic diagram of the contact pressure monitoring curve between the initial support and the secondary lining of the tunnel;

[0040] Figure 6 Schematic diagram of the load-structure numerical calculation model;

[0041] Figure 7 Schematic diagram of lining temperature change curve

[0042] Figure 8 Determine the schematic diagram for the timing of lining demoulding. DETAILED DESCRIPTION

[0043] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only to enable those skilled in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0044] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0045] Figure 1 A flowchart schematically shows a method for determining the appropriate time to remove the formwork for the secondary lining concrete of a tunnel according to an embodiment of the present invention. Figure 1As shown, in this embodiment, the decision method for the reasonable time of removing the formwork of the secondary lining concrete of the tunnel includes:

[0046] According to the on-site lining concrete mix ratio and curing conditions, indoor curing test of tunnel lining concrete is carried out, and the time course curve that can reflect the mechanical parameters of lining concrete is obtained through the curing test;

[0047] A load-structure numerical calculation model is established, the mechanical parameters of the lining concrete at different curing ages on the time-history curve are input into the numerical calculation model, and the numerical calculation model is tested for loading to obtain the ultimate bearing capacity of the lining concrete at different curing ages;

[0048] Determine the first lining concrete safety factor of lining concrete (i.e. lining structure or lining concrete structure) at different curing ages;

[0049] According to the safety critical value of lining concrete, determine the second lining concrete safety factor of lining concrete;

[0050] The first lining concrete safety factor and the second lining concrete safety factor are compared, and a reasonable time for removing the formwork for the lining is determined according to the comparison result.

[0051] In this implementation, a load-structure numerical calculation model is established, the mechanical parameters of the lining concrete are input into the numerical calculation model, and the numerical calculation model is subjected to a test load to obtain the ultimate bearing capacity of the lining concrete at different curing ages: a load-structure numerical calculation model is obtained by modeling through MIDADAS software, the mechanical parameters of concrete at different curing ages are obtained through indoor curing tests, and numerical simulation calculations are performed based on the parameters obtained from the indoor tests to obtain the ultimate bearing capacity at different curing ages.

[0052] Further, according to one embodiment of the present invention, Figure 2 , Figure 3 and Figure 4 As shown, the above-mentioned time-history variation curves include a time-history variation curve of the compressive strength of the lining concrete, a time-history variation curve of the tensile strength of the lining concrete and a time-history variation curve of the elastic modulus of the lining concrete. The compressive strength of the lining concrete, the tensile strength of the lining concrete and the elastic modulus of the lining concrete at different curing ages can be obtained through each time-history variation curve.

[0053] Further, according to an embodiment of the present invention, determining the first lining concrete safety factor of lining concrete at different curing ages includes:

[0054] Real-time monitoring of the contact pressure between the initial support (concrete of the initial support) and the secondary lining (concrete of the secondary lining) at different curing ages; the contact pressure monitoring curve between the initial support and the secondary lining is as follows: Figure 5 As shown;

[0055] Calculate the ratio of the ultimate bearing capacity of the lining concrete to the contact pressure between the initial support and the secondary lining at different curing ages, so as to determine the safety factor of the first lining concrete at different curing ages

[0056] In this embodiment, the first lining concrete safety factor ξ of the lining concrete with a curing age of n days is:

[0057]

[0058] in, is the ultimate bearing capacity of lining concrete with a curing age of n days; It is the real-time monitoring value of the contact pressure between the primary support and the secondary lining.

[0059] In this embodiment, the load-structure numerical calculation model is as follows: Figure 6 shown.

[0060] Further, according to one embodiment of the present invention, the second lining concrete safety factor ξ of the lining concrete is determined according to the safety critical value of the lining concrete. A for:

[0061]

[0062] Where A is the ratio of the monitoring value between the monitoring platform used to monitor the contact pressure and the secondary lining concrete that does not exceed the bearing capacity of the secondary lining concrete, which is the safety critical value.

[0063] Further, according to an embodiment of the present invention, the safety factor of the first lining concrete is compared with the safety factor of the second lining concrete, and the reasonable time for removing the lining formwork is determined according to the comparison result:

[0064] The safety factor of the first lining concrete at different curing ages is compared with the safety factor of the second lining concrete. When the safety factor of the first lining concrete at a certain curing age is not lower than the safety factor of the second lining concrete, the curing age of the lining at this time is the reasonable time for lining demoulding, and the corresponding lining concrete strength is the lining demoulding strength. This setting can better determine the demoulding time of the lining and ensure the curing quality of the lining.

[0065] In this embodiment, the method for determining the ratio of surrounding rock pressure shared by the primary support and secondary lining of the tunnel is used as a reference. It is assumed that when the monitored value of the contact pressure between the secondary lining and the primary support of the tunnel at a certain curing age does not exceed A% of the ultimate bearing capacity of the tunnel lining concrete at the same curing age, the tunnel lining concrete is considered safe and the lining demolding operation can be carried out.

[0066] Furthermore, according to one embodiment of the present invention, the hydration reaction of concrete releases a large amount of heat, which affects the change in concrete temperature. Therefore, from a temperature perspective, after the lining concrete is poured, due to the insufficient strength of the early concrete and the bearing capacity of the lining concrete, especially during the temperature drop of the lining, it is also faced with the risk of thermal shrinkage cracking. It is particularly important to reasonably control the timing of lining demolding. Therefore, the timing of lining demolding should be selected during the lining temperature drop stage, and the lining temperature should be reduced to a temperature that can ensure the safety of the lining concrete. The lining temperature change curve is as follows: Figure 7 As shown, the timing of lining demoulding is determined as follows: Figure 8 As shown, Figure 8 The safety factor of the tunnel lining structure includes the first lining concrete safety factor ξ and the second lining concrete safety factor ξ A , Figure 8 Safety factor of the second lining concrete ξ A The corresponding d A That is the time to remove the mold.

[0067] According to the above scheme of the present invention, the present invention considers the safety critical value by drawing on the method for determining the ratio of surrounding rock pressure shared by initial tunnel support and secondary lining; by considering the lining temperature change curve, combining the safety factor and the safety critical value to determine the reasonable timing of lining demolding, the present invention can improve the construction quality, speed up the construction progress, improve the operation of the template trolley, reduce the construction cost, ensure the structural safety and reduce the temperature cracks by determining the reasonable timing of secondary lining demolding. Because demolding too early may cause lining cracking, settlement deformation and structural instability, increasing maintenance costs; while demolding too late will extend the construction period, reduce the efficiency of template use, and increase construction costs.

[0068] According to the above solution of the present invention, the timing of demoulding determined by the present invention is highly accurate: the data comes from field tests, numerical simulations, and field tests, and the data are highly linked and mutually verified;

[0069] The timing of demoulding determined by the present invention is highly safe: the safety critical value in actual construction, the hydration heat of the lining (such as Figure 7 As shown) and concrete thermal shrinkage cracking, so the safety is high;

[0070] The demoulding timing determined by the present invention has strong applicability: starting from the actual situation on site, considering the actual construction situation on site, and taking the on-site data as the first-hand data and the final judgment basis.

[0071] Furthermore, in order to achieve the above-mentioned purpose, the present invention also provides a decision system for the reasonable time of demoulding of the secondary lining concrete of the tunnel, comprising:

[0072] The lining concrete mechanical parameter acquisition module conducts indoor tunnel lining concrete curing tests based on the on-site lining concrete mix ratio and curing conditions, and obtains the time-course change curve that can reflect the lining concrete mechanical parameters through the curing test;

[0073] The ultimate bearing capacity calculation module establishes a load-structure numerical calculation model, inputs the mechanical parameters of the lining concrete into the numerical calculation model, and performs test loading on the numerical calculation model to obtain the ultimate bearing capacity of the lining concrete at different curing ages;

[0074] The first lining concrete safety factor calculation module determines the first lining concrete safety factor of the lining concrete at different curing ages;

[0075] A second lining concrete safety factor calculation module, which determines the second lining concrete safety factor of the lining concrete according to the safety critical value of the lining concrete;

[0076] The demolding timing decision module compares the first lining concrete safety factor with the second lining concrete safety factor, and determines a reasonable demolding timing for the lining according to the comparison result.

[0077] Further, according to one embodiment of the present invention, Figure 2 , Figure 3 and Figure 4 As shown, the above-mentioned time-history variation curves include a time-history variation curve of the compressive strength of the lining concrete, a time-history variation curve of the tensile strength of the lining concrete and a time-history variation curve of the elastic modulus of the lining concrete. The compressive strength of the lining concrete, the tensile strength of the lining concrete and the elastic modulus of the lining concrete at different curing ages can be obtained through each time-history variation curve.

[0078] Further, according to an embodiment of the present invention, determining the first lining concrete safety factor of lining concrete at different curing ages includes:

[0079] Real-time monitoring of the contact pressure between the initial support and the secondary lining and the contact pressure between the secondary lining and the lining trolley template at different curing ages; the contact pressure monitoring curve between the initial support and the secondary lining is as follows: Figure 5 As shown;

[0080] Calculate the ratio of the ultimate bearing capacity of the lining concrete to the contact pressure between the initial support and the secondary lining plus the lining deadweight at different curing ages, so as to determine the safety factor of the first lining concrete at different curing ages.

[0081] In this embodiment, the first lining concrete safety factor ξ of the lining concrete with a curing age of n days is:

[0082]

[0083] in, is the ultimate bearing capacity of lining concrete with a curing age of n days; It is the real-time monitoring value of the contact pressure between the primary support and the secondary lining.

[0084] In this embodiment, the load-structure numerical calculation model is as follows: Figure 6 shown.

[0085] Further, according to one embodiment of the present invention, the second lining concrete safety factor ξ of the lining concrete is determined according to the safety critical value of the lining concrete. A for:

[0086]

[0087] Where A is the ratio of the monitoring value between the monitoring platform used to monitor the contact pressure and the secondary lining concrete that does not exceed the bearing capacity of the secondary lining concrete, which is the safety critical value.

[0088] Further, according to an embodiment of the present invention, the safety factor of the first lining concrete is compared with the safety factor of the second lining concrete, and the reasonable time for removing the lining formwork is determined according to the comparison result:

[0089] The calculated safety factor of the first lining concrete at different curing ages is compared with the safety factor of the second lining concrete. When the safety factor of the first lining concrete at a certain curing age is not lower than the safety factor of the second lining concrete, the curing age of the lining at this time is the reasonable time to remove the formwork of the lining.

[0090] Furthermore, according to one embodiment of the present invention, the hydration reaction of concrete releases a large amount of heat, which affects the change in concrete temperature. Therefore, from a temperature perspective, after the lining concrete is poured, due to the insufficient strength of the early concrete and the bearing capacity of the lining concrete, especially during the temperature drop of the lining, it is also faced with the risk of thermal shrinkage cracking. It is particularly important to reasonably control the timing of lining demolding. Therefore, the timing of lining demolding should be selected during the lining temperature drop stage, and the lining temperature should be reduced to a temperature that can ensure the safety of the lining concrete. The lining temperature change curve is as follows: Figure 7 As shown in the figure, the timing of lining demoulding is determined as follows: Figure 8 As shown, Figure 8 The safety factor of the tunnel lining structure includes the first lining concrete safety factor ξ and the second lining concrete safety factor ξ A , Figure 8 Safety factor of the second lining concrete ξ A The corresponding d A That is the time to remove the mold.

[0091] According to the above scheme of the present invention, the present invention considers the safety critical value by drawing on the method for determining the ratio of surrounding rock pressure shared by initial tunnel support and secondary lining; by considering the lining temperature change curve, combining the safety factor and the safety critical value to determine the reasonable timing of lining demolding, the present invention can improve the construction quality, speed up the construction progress, improve the operation of the template trolley, reduce the construction cost, ensure the structural safety and reduce the temperature cracks by determining the reasonable timing of secondary lining demolding. Because demolding too early may cause lining cracking, settlement deformation and structural instability, increasing maintenance costs; while demolding too late will extend the construction period, reduce the efficiency of template use, and increase construction costs.

[0092] According to the above solution of the present invention, the timing of demoulding determined by the present invention is highly accurate: the data comes from field tests, numerical simulations, and field tests, and the data are highly linked and mutually verified;

[0093] The timing of demoulding determined by the present invention is highly safe: the safety critical value in actual construction, the hydration heat of the lining (such as Figure 7 As shown) and concrete thermal shrinkage cracking, so the safety is high;

[0094] The demoulding timing determined by the present invention has strong applicability: starting from the actual situation on site, considering the actual construction situation on site, and taking the on-site data as the first-hand data and the final judgment basis.

[0095] Furthermore, to achieve the above-mentioned purpose, the present invention also provides an electronic device, including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the decision method for the reasonable time of demolding the secondary lining concrete of the tunnel as described above is implemented.

[0096] Furthermore, to achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the decision method for the reasonable time of demolding the secondary lining concrete of the tunnel as described above is implemented.

[0097] Those skilled in the art will appreciate that the modules and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0098] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and equipment can refer to the corresponding processes in the aforementioned method implementation methods, and will not be repeated here.

[0099] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0100] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0101] In addition, each functional module in the embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0102] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the energy-saving signal sending / receiving method of each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical disks.

[0103] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0104] It should be understood that the size of the serial numbers of each step in the content of the invention and the implementation methods of the present invention does not absolutely mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation methods of the present invention.

Claims

1. A decision-making method for the reasonable time of removing the formwork of the secondary lining concrete of the tunnel, characterized by: include: According to the on-site lining concrete mix ratio and curing conditions, indoor curing test of tunnel lining concrete is carried out, and the time course curve that can reflect the mechanical parameters of lining concrete is obtained through the curing test; Establish a load-structure numerical calculation model, input the mechanical parameters of the lining concrete into the numerical calculation model, and test load the numerical calculation model to obtain the ultimate bearing capacity of the lining concrete at different curing ages; Determine the first lining concrete safety factor of lining concrete at different curing ages; According to the safety critical value of lining concrete, determine the second lining concrete safety factor of lining concrete; Comparing the first lining concrete safety factor with the second lining concrete safety factor, and determining a reasonable time range for lining formwork removal according to the comparison result; The timing for lining demoulding is determined according to the reasonable timing range for lining demoulding and the temperature drop range of the lining.

2. The decision method for determining the reasonable time to remove the formwork of the secondary lining concrete of a tunnel according to claim 1 is characterized in that: The mechanical parameters of the lining concrete include: compressive strength of the lining concrete, tensile strength of the lining concrete and elastic modulus of the lining concrete.

3. The decision method for determining the reasonable time to remove the formwork of the secondary lining concrete of a tunnel according to claim 1 is characterized in that: The method for determining the first lining concrete safety factor of the lining concrete at different curing ages includes: Real-time monitoring of the contact pressure between the initial support concrete and the secondary lining concrete at different curing ages; The ratio of the ultimate bearing capacity of the lining concrete to the contact pressure between the initial support concrete and the secondary lining concrete at different curing ages is calculated to determine the safety factor of the first lining concrete at different curing ages.

4. The decision method for determining the reasonable time to remove the formwork of the secondary lining concrete of a tunnel according to claim 1 is characterized in that: The safety factor ξ of the first lining concrete with a curing age of n days is: in, is the ultimate bearing capacity of lining concrete with a curing age of n days; It is the real-time monitoring value of the contact pressure between the initial support concrete and the secondary lining concrete.

5. The decision method for determining the reasonable time to remove the formwork of the secondary lining concrete of a tunnel according to claim 1 is characterized in that: According to the safety critical value of lining concrete, determine the second lining concrete safety factor ξ A for: Where A is the ratio of the monitoring value between the monitoring platform used to monitor the contact pressure and the secondary lining concrete that does not exceed the bearing capacity of the secondary lining concrete, which is the safety critical value.

6. The decision method for the reasonable time of removing the formwork of the secondary lining concrete of a tunnel according to any one of claims 1 to 5, characterized in that: By comparing the first lining concrete safety factor and the second lining concrete safety factor, the reasonable time range for lining formwork removal is determined according to the comparison result: The calculated safety factor of the first lining concrete at different curing ages is compared with the safety factor of the second lining concrete. When the safety factor of the first lining concrete at a certain curing age is not lower than the safety factor of the second lining concrete, the lining curing age at this time is within the reasonable range of lining formwork removal timing.

7. A decision-making system for the reasonable time of removing the formwork for the secondary lining concrete of the tunnel, characterized by: include: The lining concrete mechanical parameter acquisition module conducts indoor tunnel lining concrete curing tests based on the on-site lining concrete mix ratio and curing conditions, and obtains the time-course change curve that can reflect the lining concrete mechanical parameters through the curing test; The ultimate bearing capacity calculation module establishes a load-structure numerical calculation model, inputs the mechanical parameters of the lining concrete into the numerical calculation model, and performs test loading on the numerical calculation model to obtain the ultimate bearing capacity of the lining concrete at different curing ages; The first lining concrete safety factor calculation module determines the first lining concrete safety factor of the lining concrete at different curing ages; A second lining concrete safety factor calculation module, which determines the second lining concrete safety factor of the lining concrete according to the safety critical value of the lining concrete; The demolding timing decision module compares the first lining concrete safety factor with the second lining concrete safety factor, and determines a reasonable demolding timing for the lining according to the comparison result.

8. An electronic device, characterized in that The method comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements a method for deciding a reasonable time for demolding the secondary lining concrete of a tunnel as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the method for deciding the reasonable time to demold the secondary lining concrete of the tunnel according to any one of claims 1 to 6 is implemented.

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