A method for controlling continuous destruction of a shield tunnel

Abstract

The application relates to the technical field of shield tunnel engineering, and discloses a control method for continuous damage of a shield tunnel. The damage range threshold of a current shield tunnel is determined according to the buried depth and the outer diameter of the current shield tunnel; the position of a key ring and the critical length of a reinforcing unit are determined according to a shield tunnel continuous damage control strategy based on an occurrence position; and the critical length of the reinforcing unit is arranged on both sides of the occurrence position along the extension direction of the shield tunnel at the positions of the corresponding key rings, so that the continuous damage of the shield tunnel is controlled. The critical length of the reinforcing unit is arranged at the positions of the key rings, the continuous damage of the shield tunnel is controlled, and the control effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunnel engineering, and particularly relates to a control method for continuous damage of a shield tunnel. BACKGROUND

[0002] Shield tunnels have been widely used in subways, railways and cross-river traffic due to their high cost-effectiveness, small environmental impact and fast construction speed. A shield tunnel is composed of thousands of segments connected by bolts, and thousands of joints are formed between the segments. Unlike continuous pipes, the existence of a large number of joints in a shield tunnel significantly reduces the structural integrity of the tunnel and greatly weakens the integrity of the tunnel.

[0003] Although the design of a shield tunnel has safety redundancy to ensure that each segment ring operates under predetermined conditions, when unexpected risks and uncertainties occur, the tunnel may be subjected to abnormal loads, thereby increasing the likelihood of damage. This may lead to large-scale damage and cause significant property losses. Existing studies on accidents of shield tunnels have shown that a shield tunnel may experience continuous damage due to local small damage, and the main damage of a shield tunnel occurs at the joints rather than the segments themselves. However, the existing studies on damage control of shield tunnels do not consider the influence of the joints of the tunnel.

[0004] Therefore, there is an urgent need for a control method for continuous damage of a shield tunnel, which can control continuous damage based on the joints of the tunnel and improve the control effect. SUMMARY

[0005] To solve the above technical problems, the present application provides a control method for continuous damage of a shield tunnel, which comprises the following steps:

[0006] obtaining the burial depth and outer diameter of a current shield tunnel;

[0007] determining a damage range threshold of the current shield tunnel based on the burial depth and outer diameter of the current shield tunnel; the damage range threshold is used to represent the minimum number of damaged segment rings that cause continuous damage under the current burial depth and outer diameter;

[0008] obtaining the occurrence position and the number of damaged segment rings of a current initial local damage in the shield tunnel;

[0009] if the number of damaged segment rings exceeds the damage range threshold, determining the position of a key ring and the critical length of a reinforcement unit based on the occurrence position and according to a continuous damage control strategy of the shield tunnel; the position of the key ring is the position of the reinforcement unit; and the critical length of the reinforcement unit is the number of rings of the reinforcement unit;

[0010] Along the direction of the shield tunnel, on both sides of the occurrence position, a reinforcing unit with a critical length of the reinforcing unit is arranged at the position of the corresponding key ring, to control the continuous damage of the shield tunnel.

[0011] Further, the method for obtaining the continuous damage control strategy of the shield tunnel is:

[0012] Collecting related data of the shield tunnel that has historically occurred continuous damage, wherein the related data of the shield tunnel that has historically occurred continuous damage includes the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring, and the critical length of the reinforcing unit;

[0013] Simulating the continuous damage of the shield tunnel by a numerical simulation method to obtain related data of the shield tunnel that has simulated continuous damage, wherein the related data of the shield tunnel that has simulated continuous damage includes the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring, and the critical length of the reinforcing unit;

[0014] According to the related data of the shield tunnel that has historically occurred continuous damage and the related data of the shield tunnel that has simulated continuous damage, a control strategy corresponding relation table is made, wherein the control strategy corresponding relation table is the corresponding relation between the buried depth and the outer diameter of each shield tunnel and the position of each key ring and the critical length of the reinforcing unit;

[0015] The control strategy corresponding relation table is taken as the continuous damage control strategy of the shield tunnel.

[0016] Further, the method for obtaining the continuous damage control strategy of the shield tunnel is:

[0017] Collecting related data of the shield tunnel that has historically occurred continuous damage, wherein the related data of the shield tunnel that has historically occurred continuous damage includes the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring, and the critical length of the reinforcing unit;

[0018] Simulating the continuous damage of the shield tunnel by a numerical simulation method to obtain related data of the shield tunnel that has simulated continuous damage, wherein the related data of the shield tunnel that has simulated continuous damage includes the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring, and the critical length of the reinforcing unit;

[0019] According to the related data of the shield tunnel that has historically occurred continuous damage and the related data of the shield tunnel that has simulated continuous damage, a control strategy fitting formula is obtained, wherein the control strategy fitting formula is used to represent the fitting relation between the buried depth and the outer diameter of each shield tunnel and the position of each key ring and the critical length of the reinforcing unit;

[0020] The control strategy fitting formula is taken as the continuous damage control strategy of the shield tunnel.

[0021] Further, the shield tunnel continuous damage control strategy acquisition method is:

[0022] collecting related data of a historical shield tunnel that has experienced continuous damage; the related data of the historical shield tunnel that has experienced continuous damage includes a buried depth of the shield tunnel, an outer diameter of the shield tunnel, a position of a key ring, and a critical length of a reinforcing unit;

[0023] obtaining, by a numerical simulation method, related data of a simulated shield tunnel that has experienced continuous damage; the related data of the simulated shield tunnel that has experienced continuous damage includes a buried depth of the shield tunnel, an outer diameter of the shield tunnel, a position of a key ring, and a critical length of a reinforcing unit;

[0024] using the related data of the historical shield tunnel that has experienced continuous damage and the related data of the simulated shield tunnel that has experienced continuous damage as a training set;

[0025] constructing a control strategy model; using the buried depth of the shield tunnel and the outer diameter of the shield tunnel as inputs of the control strategy model, and using the position of the key ring and the critical length of the reinforcing unit as outputs of the control strategy model;

[0026] training the control strategy model by using the training set;

[0027] outputting, by the trained control strategy model, a shield tunnel continuous damage control strategy.

[0028] Further, the position of the key ring is a continuous damage boundary caused by an initial local damage.

[0029] Further, reinforcing units of the critical length of the reinforcing unit are respectively arranged at positions of corresponding key rings to control continuous damage of the shield tunnel, and the method specifically includes:

[0030] reinforcing units are arranged at the positions of the key rings, and are arranged close to and away from the direction of the initial local damage; and the sum of the number of the reinforcing units arranged at the positions of the key rings is the critical length of the reinforcing unit.

[0031] Further, a damage range threshold of a current shield tunnel is determined by the buried depth and the outer diameter of the current shield tunnel, and the method specifically includes:

[0032] a damage range threshold relationship is determined by a historical data collection method or a numerical simulation method; the damage range threshold relationship is used to represent a corresponding relationship between the buried depth and the outer diameter of each shield tunnel and the damage range threshold;

[0033] the damage range threshold of the current shield tunnel is determined by searching the damage range threshold relationship according to the buried depth and the outer diameter of the current shield tunnel.

[0034] Further, the reinforcing operation of the reinforcing unit includes an inter-ring reinforcing operation of the tunnel segment and an intra-ring reinforcing operation of the tunnel segment.

[0035] The application also provides a shield tunnel continuous damage control system for executing the control method of any one of the above-mentioned shield tunnel continuous damage control methods. The control system comprises a damage range threshold module, a current shield tunnel information acquisition module, and a continuous damage control strategy output module.

[0036] The damage range threshold module is configured to acquire the burial depth and the outer diameter of the current shield tunnel, and determine a damage range threshold of the current shield tunnel based on the burial depth and the outer diameter of the current shield tunnel. The damage range threshold is used to represent the minimum number of damaged segment rings that can cause continuous damage under the current burial depth and the outer diameter.

[0037] The current shield tunnel information acquisition module is configured to acquire the occurrence position of the current initial local damage in the shield tunnel and the number of damaged segment rings.

[0038] The continuous damage control strategy output module is configured to determine the position of a key ring and a critical length of a reinforcing unit based on the occurrence position and according to a shield tunnel continuous damage control strategy if the number of damaged segment rings exceeds the damage range threshold. The position of the key ring is the position at which the reinforcing unit is arranged, and the critical length of the reinforcing unit is the number of reinforcing units.

[0039] The application has the following technical effects:

[0040] The control method of the shield tunnel continuous damage provided by the application proposes the position of the key ring and the critical length of the reinforcing unit, and determines the position of the key ring and the critical length of the reinforcing unit according to the shield tunnel continuous damage control strategy, that is, arranges the reinforcing unit with the critical length of the reinforcing unit at the position of the key ring, controls the continuous damage of the shield tunnel, and improves the control effect. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0042] Figure 1 is a step flowchart of the control method of the shield tunnel continuous damage provided by the embodiments of the application;

[0043] Figure 2is a schematic diagram of an influence range of the near-ring continuous damage provided by the embodiment of the present application;

[0044] Figure 3 is a schematic diagram of the setting of the reinforcing unit of the S EU_1 model and the S EU_2 model;

[0045] Figure 4 is a schematic diagram of the setting of the reinforcing unit of the S EU_1 model and the S EU_2 model;

[0046] Figure 5 is a schematic diagram of the setting and control effect of the S EU_3 model;

[0047] Figure 6 is a schematic diagram of the setting and control effect of the S EU_4 model;

[0048] Figure 7 is a schematic diagram of the setting and control effect of the S EU_5 model and the S EU_6 model. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0050] The continuous failure of a shield tunnel is related to the buried depth of the tunnel and the local failure range, but the continuous failure process of the tunnel under different conditions is similar. The continuous failure process of the tunnel can be summarized as four stages, i.e., "local failure ring collapse", "inter-ring joint failure", "in-ring joint failure", and "continuous failure termination". After local failure, the local failure ring collapses under the action of earth pressure, thereby causing the soil outside the tunnel to flow into the tunnel. Under the influence of the soil outside the tunnel, the tension in the inter-ring joint internal force rises, causing the inter-ring joint to fail. After the inter-ring joint fails, the integrity of the tunnel as a whole is reduced. Under the combined influence of the gravity of the soil inside the tunnel and the unloading effect of the soil outside the tunnel, the in-ring joint of the tunnel fails. With the gradual stabilization of the soil flowing into the tunnel, the external load on the tunnel structure gradually stabilizes, and the continuous failure of the tunnel also stops. The above four stages can comprehensively summarize the development process of the continuous failure of the tunnel. The above four stages may not all appear in the continuous failure process under certain conditions, but the order of the four stages is certain.

[0051] Based on the problem that the existing research on the failure control of a shield tunnel does not consider the influence of a tunnel joint, the present application provides, in one aspect, a control method for the continuous failure of a shield tunnel, comprising the steps of Figure 1 It can be known that the method comprises the following steps:

[0052] S1: obtaining the buried depth and outer diameter of a current shield tunnel;

[0053] The outer diameter of the shield tunnel is denoted as D. In order to simplify the record, the outer diameter of the shield tunnel is taken as the unit of the buried depth, i.e., the buried depth of the shield tunnel is XD, and X can be 1, 2, ….

[0054] S2: determining the failure range threshold of the current shield tunnel through the buried depth and outer diameter of the current shield tunnel; the failure range threshold is used to represent the minimum number of damaged segment rings that causes continuous failure under the current buried depth and outer diameter;

[0055] In some embodiments, the failure range threshold of the current shield tunnel is determined through the buried depth and outer diameter of the current shield tunnel; specifically,

[0056] The failure range threshold relationship is determined by collecting historical data or a numerical simulation method; the failure range threshold relationship is used to represent the corresponding relationship between the buried depth and outer diameter of each shield tunnel and the failure range threshold;

[0057] According to the buried depth and outer diameter of the current shield tunnel, the failure range threshold relationship is searched to determine the failure range threshold of the current shield tunnel.

[0058] For example, the influence range of the adjacent ring under continuous failure in a numerical simulation model is summarized. For example, Figure 2As shown, the tunnel depth is 2D, and the initial local damage range is 2.5 rings. After the local damage occurs, the adjacent structure is not affected by the continuous damage. The local damage range increases to 5.5 rings, and the local damage ring is adjacent to the ring affected by the continuous damage. The failure range of the adjacent ring is 1 ring, i.e., when the initial local damage range of the tunnel with a depth of 2D is 5.5 rings, the number of failure rings is 6.5. Therefore, for a certain shield tunnel depth and outer diameter, there is a damage range threshold (threshold tIDS) for whether the adjacent ring will be affected by the continuous damage. When the number of damaged segments of the current initial local damage is greater than or equal to the threshold tIDS, the adjacent ring structure will be affected by the continuous damage, i.e., the tunnel continuous damage will expand along the axial direction of the tunnel. For example, when the tunnel depth is 2D, the threshold tIDS is 5.5.

[0059] The influence range of the tunnel continuous damage is related to the tunnel depth and the local damage range. When the tunnel depth is certain, the larger the local damage range is, the larger the influence range of the continuous damage is, and the more the number of failure rings caused by the continuous damage is. When the local damage range is certain, the larger the tunnel depth is, the greater the influence of the continuous damage is, and the more the number of failure rings caused by the continuous damage is. Therefore, the larger the tunnel depth and the initial local damage range are, the smaller the ability of the tunnel structure to resist the continuous damage is. According to the analysis of the tunnel continuous damage under different conditions, it can be concluded that when the tunnel depth is certain, there is a damage range threshold related to the tunnel depth and outer diameter for whether the adjacent ring will be affected by the continuous damage. When the tunnel depth is large, a small range of local damage may trigger large-scale continuous damage in the tunnel. With the continuous development of underground space, the tunnel depth is also getting larger and larger. Therefore, when building a tunnel, especially when building a connecting passage, attention should be paid to prevent large-scale continuous damage caused by local damage of the tunnel.

[0060] S3: Obtain the occurrence position and the number of damaged segments of the current initial local damage in the shield tunnel; for example, the geological radar method can be used to obtain the occurrence position.

[0061] S4: If the number of damaged segments exceeds the damage range threshold, determine the position of the key ring and the critical length of the reinforcement unit based on the occurrence position according to the shield tunnel continuous damage control strategy; the position of the key ring is the position of the reinforcement unit; and the critical length of the reinforcement unit is the number of rings of the reinforcement unit.

[0062] Illustratively, the present application simulates a shield tunnel by numerical simulation, based on the symmetry of the tunnel, 50.5 segments are constructed in the model, the length of the first segment is half of the length of the other segments. The interaction between the soil and the tunnel structure is realized by the "general contact" algorithm based on the penalty contact method. The friction coefficient between the soil and the concrete segments is taken as 0.4. The interaction between adjacent segments (i.e. the behavior of the tunnel joints) is modeled by connectors. In the numerical model of the present study, the bolts connecting the adjacent segments are not considered. Two types of connectors are constructed in the model. The connectors used to reflect the circumferential joints have three behaviors, i.e. they can bear shear force, tension and compression. The connectors used to reflect the longitudinal joints have four behaviors, i.e. they can bear shear force, tension, compression and bending moment.

[0063] The simulation of the continuous failure of the shield tunnel is divided into two steps:

[0064] Step 1: Set the initial boundary conditions and initial stress conditions for the model. Zero velocity boundary conditions are applied on the sides and the bottom of the Eulerian domain, and zero displacement boundary conditions are applied on both sides of the tunnel.

[0065] Step 2: Remove the initially damaged segments. The local failure of the tunnel is simulated by removing segments, which are referred to as initially damaged segments (IDSs). After the initial stress state is stabilized, the IDSs are removed to simulate the initial local failure of the tunnel.

[0066] In model S EU_1 , one reinforcement unit is set, i.e. in the third and fourth segments adjacent to the locally damaged segment, the strength of the intra-segment joint is reinforced so that it will not fail; at the same time, the strength of the inter-segment joint between the third and fourth segments is reinforced so that it will not fail, as shown in a of Figure 3 . In model S EU_2 , two reinforcement units are set, i.e. in the third and fourth segments, the seventh and eighth segments adjacent to the locally damaged segment, the strength of the intra-segment joint is reinforced so that it will not fail; at the same time, the strength of the inter-segment joint between the third and fourth segments, the seventh and eighth segments is reinforced so that it will not fail, as shown in b of Figure 3 . In both models, the tunnel depth is 4D, and the local damage range is 2.5 segments.

[0067] The calculation results are shown in Figure 4 , where the deformation of the tunnel structure in the axial direction is enlarged by 3 times in the figure to make the continuous failure range more clear. The calculation results show that setting one or more reinforcement units around the locally damaged segment does not effectively prevent the occurrence of continuous failure. By Figure 4 , it can be found that although the number of reinforcement units set in the two models is different, the Figure 4In a and b, the results of the two models show that the scope of continuous damage has developed to the 14th ring, that is, the scope of continuous damage in the two models is the same as that of the continuous damage in the results of model S6. EU_1 and Model S EU_2 , but no reinforcement unit is set. According to the analysis of the continuous damage development process, after the continuous damage of the tunnel is triggered, the inter-ring joints of the tunnel structure within the affected area are damaged first. EU_1 and S EU_2 The reinforcement units in the figure are all within the continuous damage influence range. This can only ensure that the joints within the reinforcement units do not fail, but it cannot prevent the occurrence of continuous damage or control the scope of continuous damage. Therefore, when the reinforcement units are placed within the continuous damage influence range, it is impossible to prevent the occurrence of continuous damage or control the scope of continuous damage.

[0068] Based on the previous calculation results, it can be seen that when the shield tunnel depth is 4D and the local damage range is 2.5 rings, the impact range of continuous damage is 14.5 rings. Figure 2 Therefore, in the Model S EU_3 In the example, the reinforcement units are set at the edge of the continuous damage influence range, that is, the inner joints of the fourteenth and fifteenth rings, as well as the inter-ring joints between them, are reinforced. Figure 5 The calculation results are shown in a. Figure 5 As shown in b, the results show that after local damage occurs, continuous damage to the tunnel will still occur, and the range of continuous damage increases to 15.5 rings, which is greater than the calculation results of model S6. EU_3 In the case of the reinforcement unit, the setting of the reinforcement unit did not reduce the influence range of the continuous damage, but increased the influence range of the continuous damage to 15.5 rings. EU_3 The results of model S6 show that in model S6, after local failure occurs, the tension of the inter-ring joints in the tunnels adjacent to the local failure ring increases, among which the tension of the inter-ring joint between the 14th and 15th rings increases faster and tensile failure occurs; after the inter-ring joint between the 14th and 15th rings fails, the tension in the inter-ring joints from the 15th ring to the farther range decreases, indicating that the failure of the inter-ring joint between the 14th and 15th rings has a certain protective effect on it. In model S EU_3 In the process of continuous destruction, since the inter-ring joint between the fourteenth and fifteenth rings does not fail, the internal force between the fifteenth and sixteenth rings continues to increase, and finally tensile failure occurs.

[0069] In order to further explore the control of the impact range of continuous damage, in the model S EU_3 Based on the Model S EU_4The ring inner joint of the thirteenth ring, the sixteenth ring and the seventeenth ring is reinforced, and the ring inner joint between the thirteenth ring and the fourteenth ring, the fifteenth ring and the seventeenth ring is also reinforced, as shown in Fig. 1. Figure 6 The calculation result is shown in Fig. 2a, and the result shows that, after the local damage occurs, the influence of the continuous damage is reduced to 12.5 rings. Figure 6 In the model S EU_4 , the reinforcing unit does not prevent the occurrence of continuous damage, but reduces the range of continuous damage. It is considered that when the reinforcing unit is arranged at the edge of the influence range of continuous damage, and the range of the reinforcing unit is increased, the reinforcing unit can control the range of continuous damage.

[0070] Therefore, in the above embodiment, the shield tunnel continuous damage control strategy takes the continuous damage boundary 14.5 caused by the initial local damage as the position of the key ring, and the reinforcing unit critical length 5 rings output by the shield tunnel continuous damage control strategy is used for reinforcing operation. That is, when the shield tunnel buried depth is 4D, and the local damage range is 2.5 rings, the reinforcing unit critical length of 5 rings of 13, 14, 15, 16 and 17 is used for ring inner and ring inner reinforcing operation, so that the continuous damage range is reduced from 14.5 rings to 12.5 rings.

[0071] In order to further study the range of the reinforcing unit required to control the continuous damage, the model S EU_5 is set, the shield tunnel buried depth is 3D, the local damage range is 2.5 ring segments, the reinforcing unit is arranged at the edge of the influence range of continuous damage, and is extended by 1 ring on both sides along the axial direction of the tunnel, which can control the influence range of continuous damage and reduce the continuous damage range by 1 ring, as shown in Fig. 3a. Figure 7 The model S EU_6 is set, the shield tunnel buried depth is 5D, the local damage range is 2.5 ring segments, and the reinforcing unit needs to be arranged at the edge of the influence range of continuous damage, and is extended by 7 rings in the direction away from the local damage ring along the axial direction of the tunnel, and is extended by 1 ring in the direction close to the local damage ring, which can control the influence range of continuous damage and reduce the continuous damage range by 1 ring, as shown in Fig. 4b. Figure 7

[0072] ​Based on the above calculation results, it is believed that in the shield tunnel, there is a "key unit" that controls the influence range of continuous damage, that is, only when the key unit is strengthened, can the influence range of continuous damage be changed. Taking the above partial model cases as examples, when the tunnel depth is 3D and the local damage range is 2.5 rings, the key units are the eighth and ninth rings; when the tunnel depth is 4D and the local damage range is 2.5 rings, the key units are the fourteenth and fifteenth rings; when the tunnel depth is 5D and the local damage range is 2.5 rings, the key units are the twenty-second and twenty-third rings. If you want to ensure that the range of continuous damage will not increase after strengthening the key ring, you should also extend the strengthening range along the direction of the tunnel axis away from the local damage ring, and the range that needs to be extended is related to the depth of the tunnel. Taking the above partial model cases as examples, when the tunnel depth is 3D, strengthening the key unit can control and reduce the range of continuous damage; when the tunnel depth is 4D, the strengthening ring range needs to continue to extend 2 rings (i.e. the sixteenth and seventeenth rings) in the direction of the tunnel axis away from the local damage ring; and when the tunnel depth is 5D, the strengthening ring range needs to continue to extend 6 rings (i.e. the twenty-fourth to twenty-ninth rings) in the direction of the tunnel axis away from the local damage ring. At the same time, according to the cases in this section, on the basis of controlling the range of continuous damage, further reducing the influence range of continuous damage, the strengthening range should be extended in the direction of the tunnel axis close to the local damage ring, and the strengthening range is the same as the influence range of continuous damage that can be reduced. In models S EU_5 and S EU_6 , the strengthening ring strengthens the key unit, but does not continue to extend in the direction close to the local damage, model S EU_5 compared with model S9 (the depth and initial local damage range are the same as model S EU_5 , but no strengthening unit is set), the influence range of continuous damage is reduced by 1 ring. Model S EU_6 compared with model S3 (the depth and initial local damage range are the same as model S EU_6 , but no strengthening unit is set), also reduces the influence range of continuous damage by 1 ring; and in model S EU_4 , the strengthening range of the strengthening ring continues to extend 1 ring in the direction close to the local damage, compared with model S6, the influence range of continuous damage is reduced by 2 rings.

[0073] The shield tunnel continuous damage control strategy is a basis for controlling continuous damage. It is mainly based on a large amount of known and accurate data to establish a corresponding relationship between the burial depth of each shield tunnel, the outer diameter of the shield tunnel, the position of each key ring and the critical length of the reinforcing unit. The shield tunnel continuous damage control strategy can be in the form of a corresponding relationship table, a fitting formula or a neural network model. The present application does not limit the form of the shield tunnel continuous damage control strategy, and mainly reflects the corresponding relationship between the burial depth of each shield tunnel, the outer diameter of the shield tunnel, the position of each key ring and the critical length of the reinforcing unit.

[0074] In some embodiments, the method for obtaining the shield tunnel continuous damage control strategy is as follows:

[0075] Collecting relevant data of shield tunnels that have historically experienced continuous damage. The relevant data of shield tunnels that have historically experienced continuous damage include the burial depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcing unit.

[0076] Simulating the continuous damage of the shield tunnel by a numerical simulation method to obtain relevant data of the simulated shield tunnel that has experienced continuous damage. The relevant data of the simulated shield tunnel that has experienced continuous damage include the burial depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcing unit.

[0077] According to the relevant data of the shield tunnels that have historically experienced continuous damage and the relevant data of the simulated shield tunnel that has experienced continuous damage, a control strategy corresponding relationship table is made. The control strategy corresponding relationship table is a corresponding relationship between the burial depth of each shield tunnel, the outer diameter of the shield tunnel, the position of each key ring and the critical length of the reinforcing unit.

[0078] The control strategy corresponding relationship table is used as the shield tunnel continuous damage control strategy.

[0079] In some embodiments, the method for obtaining the shield tunnel continuous damage control strategy is as follows:

[0080] Collecting relevant data of shield tunnels that have historically experienced continuous damage. The relevant data of shield tunnels that have historically experienced continuous damage include the burial depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcing unit.

[0081] Simulating the continuous damage of the shield tunnel by a numerical simulation method to obtain relevant data of the simulated shield tunnel that has experienced continuous damage. The relevant data of the simulated shield tunnel that has experienced continuous damage include the burial depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcing unit.

[0082] According to the related data of the historically occurring continuous damage of the shield tunnel and the related data of the simulated continuous damage of the shield tunnel, a control strategy fitting formula is obtained; the control strategy fitting formula is used to represent the fitting relationship between the buried depth of each shield tunnel, the outer diameter of the shield tunnel, the position of each key ring and the critical length of the reinforcing unit;

[0083] The control strategy fitting formula is used as the continuous damage control strategy of the shield tunnel.

[0084] The order of the control strategy fitting formula can be adjusted according to the requirement for control accuracy.

[0085] In some embodiments, the method for obtaining the continuous damage control strategy of the shield tunnel is as follows:

[0086] The related data of the historically occurring continuous damage of the shield tunnel is collected; the related data of the historically occurring continuous damage of the shield tunnel includes the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcing unit;

[0087] The continuous damage of the shield tunnel is simulated by a numerical simulation method, and the related data of the simulated continuous damage of the shield tunnel is obtained; the related data of the simulated continuous damage of the shield tunnel includes the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcing unit;

[0088] The related data of the historically occurring continuous damage of the shield tunnel and the related data of the simulated continuous damage of the shield tunnel are used as a training set;

[0089] A control strategy model is constructed; the buried depth of the shield tunnel and the outer diameter of the shield tunnel are used as the input of the control strategy model, and the position of the key ring and the critical length of the reinforcing unit are used as the output of the control strategy model;

[0090] The control strategy model is trained by using the training set;

[0091] The trained control strategy model is used to output the continuous damage control strategy of the shield tunnel.

[0092] The control strategy model can be a neural network model or other machine learning model. The training end condition of the model can be a set number of iterations or reaching a preset loss function value. The hyperparameters of the model can also be adjusted according to the requirement for control accuracy.

[0093] S5: Along the extension direction of the shield tunnel, reinforcing units with the critical length of the reinforcing unit are arranged on both sides of the occurrence position at the positions of the corresponding key rings, so as to control the continuous damage of the shield tunnel.

[0094] Due to the symmetry of the continuous destruction of the shield tunnel, after the initial local destruction occurs, it will extend along the extension direction of the shield tunnel to both sides of the occurrence position, so it is necessary to set a reinforcing unit of critical length at the position of the corresponding key ring on both sides of the occurrence position to control the continuous destruction of the shield tunnel.

[0095] In some embodiments, reinforcing units of critical length are respectively set at the positions of the key rings to control the continuous destruction of the shield tunnel, specifically:

[0096] At the positions of the key rings, reinforcing units are set both near and away from the initial local destruction direction; the sum of the number of rings of the reinforcing units set is the critical length of the reinforcing unit.

[0097] For example, when the buried depth of the shield tunnel is 4D and the local destruction range is 2.5 rings, the influence range of the continuous destruction is 14.5 rings, i.e., the continuous destruction boundary is between the fourteenth ring and the fifteenth ring. In model S EU_4 The ring joints in the thirteenth ring, the sixteenth ring, and the seventeenth ring are reinforced, and the inter-ring joints between the thirteenth ring and the fourteenth ring near the initial local destruction direction and the fifteenth ring to the seventeenth ring away from the initial local destruction direction are also reinforced.

[0098] In some embodiments, the reinforcing operation of the reinforcing unit includes an inter-ring reinforcing operation of the tunnel segment and an intra-ring reinforcing operation of the tunnel segment.

[0099] Simultaneously performing the inter-ring reinforcing operation and the intra-ring reinforcing operation can significantly control the asymptotic destruction of the shield tunnel, improve the overall performance and service life of the shield tunnel, and provide strong protection for the safe operation of the tunnel:

[0100] Enhance the integrity of the tunnel: the inter-ring reinforcing operation strengthens the connection between the rings, making the connection at the joints of the shield tunnel more tight and stable. The intra-ring reinforcing operation enhances the strength and stiffness of the individual segment. Combined, they can significantly improve the overall integrity of the tunnel, making it more stable when facing external forces.

[0101] Improve the carrying capacity of the tunnel: the inter-ring and intra-ring reinforcing operations work together to enhance the carrying capacity of the tunnel. Even in the case of local destruction, it can effectively prevent the expansion of the destruction range and ensure the safety of the overall structure of the tunnel.

[0102] Prevent the expansion of continuous destruction: segment joints are weak links in shield tunnels that are prone to damage. By simultaneously performing inter-ring and intra-ring reinforcing operations, the strength and durability of the joints can be significantly improved, effectively preventing the expansion of continuous destruction caused by joint damage.

[0103] Prolong the service life of the tunnel: Strengthening operation can reduce the frequency of maintenance and repair costs during the use of the tunnel, thereby prolonging the service life of the tunnel. This is of great significance to improve the economic and social benefits of the tunnel.

[0104] In summary, in actual engineering, the connection between the pipe rings can be achieved by setting a tension steel beam between the rings. By applying a pre-tension to the steel beam, the adjacent pipe rings are tightly pressed together, which can effectively strengthen the overall integrity of the tunnel and improve the carrying capacity of the tunnel. The trolley can be used as a temporary measure to reinforce the strength of the pipe ring. The trolley is composed of a steel skeleton, support arms, etc. It can move back and forth along the tunnel axis within the track. Therefore, the trolley can timely reinforce the pipe ring that may be locally damaged or affected by local damage. However, due to its large space occupation, it cannot be used as a permanent reinforcement measure. During the operation of the tunnel, the strength of the pipe ring can be achieved by setting a steel support in the pipe ring. Compared with the trolley, the steel support occupies very little space and can be used permanently.

[0105] Through the exploration of the continuous damage prevention and control measures of the tunnel, it is considered that the key to the study of continuous damage lies in determining the position of the key unit, that is, the strengthening of the key unit can change the influence range of continuous damage. For the determination of the prevention and control measures of continuous damage, firstly, the position of the key unit should be determined, and secondly, the range of the strengthening unit should be determined. The inter-ring joints of the tunnel structure in the corresponding strengthening range should be strengthened, and the intra-ring joints of the locally damaged ring should also be strengthened to effectively protect the tunnel structure from the influence of continuous damage. In actual engineering, the method of setting an inter-ring tension steel beam between adjacent rings of the tunnel can be used to strengthen the inter-ring connection of the tunnel; at the same time, trolleys, intra-ring steel supports, etc. can be used as temporary measures and permanent measures to strengthen the pipe ring of the tunnel.

[0106] The application provides a control method for continuous damage of a shield tunnel, according to a continuous damage control strategy of the shield tunnel, the position of a key ring and the critical length of a strengthening unit are determined, that is, the critical length of the strengthening unit is arranged at the position of the key ring, the continuous damage of the shield tunnel is controlled, and the control effect is improved.

[0107] Another aspect of the application also provides a control system for continuous damage of a shield tunnel, which executes any one of the control methods for continuous damage of a shield tunnel, and the control system comprises a damage range threshold module, a current shield tunnel information acquisition module and a continuous damage control strategy output module.

[0108] The damage range threshold module is used to acquire the burial depth and the outer diameter of the current shield tunnel; the damage range threshold of the current shield tunnel is determined through the burial depth and the outer diameter of the current shield tunnel; the damage range threshold is used to represent the minimum number of damaged segments that can cause continuous damage under the current burial depth and the outer diameter;

[0109] The current shield tunnel information acquisition module is used to obtain the location of the current initial local damage in the shield tunnel and the number of damaged segments;

[0110] The continuous damage control strategy output module determines the location of the critical ring and the critical length of the reinforcement unit based on the occurrence location and the continuous damage control strategy of the shield tunnel if the number of damaged segment rings exceeds the damage range threshold. The location of the critical ring is the location where the reinforcement unit is set; the critical length of the reinforcement unit is the number of rings of the reinforcement unit.

[0111] It should be noted that the terms used in this application are only for describing specific embodiments and are not intended to limit the scope of this application. As shown in the specification of this application, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular and may also include the plural. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method or device comprising the elements.

[0112] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling continuous destruction of a shield tunnel, characterized in that: The steps include: Get the current shield tunnel's buried depth and outer diameter; Determining a damage range threshold of the current shield tunnel based on the buried depth and outer diameter of the current shield tunnel; the damage range threshold is used to represent the minimum number of damaged segment rings that causes continuous damage under the current buried depth and outer diameter; Obtain the location of the current initial local damage in the shield tunnel and the number of damaged segments; If the number of damaged segments exceeds the damage range threshold, the location of the critical ring and the critical length of the reinforcement unit are determined based on the occurrence location and the shield tunnel continuous damage control strategy; the location of the critical ring is the location where the reinforcement unit is set; the critical length of the reinforcement unit is the number of rings of the reinforcement unit; the continuous damage boundary caused by the initial local damage is used as the location of the critical ring; Along the extension direction of the shield tunnel, reinforcement units with critical lengths are set at the positions of corresponding key rings on both sides of the occurrence position to control the continuous destruction of the shield tunnel; at the positions of the key rings, reinforcement units are set both close to the direction of initial local destruction and away from the direction of initial local destruction; the sum of the number of rings of the reinforcement units set is the critical length of the reinforcement units.

2. A method for controlling continuous destruction of a shield tunnel according to claim 1, characterized in that: The method for obtaining the continuous destruction control strategy of the shield tunnel is: Collecting relevant data of shield tunnels that have experienced continuous damage in the past; the relevant data of shield tunnels that have experienced continuous damage in the past include the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcement unit; Simulating the continuous destruction of a shield tunnel by a numerical simulation method to obtain relevant data of the shield tunnel simulated to undergo continuous destruction; the relevant data of the shield tunnel simulated to undergo continuous destruction include the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring, and the critical length of the reinforcement unit; Creating a control strategy correspondence table based on the relevant data of the shield tunnels that have experienced continuous destruction in the past and the relevant data of the shield tunnels that have been simulated to have experienced continuous destruction; The control strategy correspondence table is a correspondence between the buried depth of each shield tunnel, the outer diameter of the shield tunnel, the position of each key ring, and the critical length of the reinforcement unit; The control strategy correspondence table is used as the shield tunnel continuous destruction control strategy.

3. The method for controlling continuous destruction of a shield tunnel according to claim 1, characterized in that: The method for obtaining the continuous destruction control strategy of the shield tunnel is: Collecting relevant data of shield tunnels that have experienced continuous damage in the past; the relevant data of shield tunnels that have experienced continuous damage in the past include the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcement unit; Simulating the continuous destruction of a shield tunnel by a numerical simulation method to obtain relevant data of the shield tunnel simulated to undergo continuous destruction; the relevant data of the shield tunnel simulated to undergo continuous destruction include the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring, and the critical length of the reinforcement unit; A control strategy fitting formula is obtained based on the relevant data of the shield tunnels that have historically experienced continuous damage and the relevant data of the shield tunnels that are simulated to have experienced continuous damage; the control strategy fitting formula is used to express the fitting relationship between the buried depth and outer diameter of each shield tunnel, the position of each key ring, and the critical length of the reinforcement unit; The control strategy fitting formula is used as the shield tunnel continuous destruction control strategy.

4. A method for controlling continuous destruction of a shield tunnel according to claim 1, characterized in that: The method for obtaining the continuous destruction control strategy of the shield tunnel is: Collecting relevant data of shield tunnels that have experienced continuous damage in the past; the relevant data of shield tunnels that have experienced continuous damage in the past include the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring and the critical length of the reinforcement unit; Simulating the continuous destruction of a shield tunnel by a numerical simulation method to obtain relevant data of the shield tunnel simulated to undergo continuous destruction; the relevant data of the shield tunnel simulated to undergo continuous destruction include the buried depth of the shield tunnel, the outer diameter of the shield tunnel, the position of the key ring, and the critical length of the reinforcement unit; Using the relevant data of the shield tunnel that has experienced continuous destruction in history and the relevant data of the shield tunnel that has been simulated to have experienced continuous destruction as a training set; Construct a control strategy model; use the buried depth and outer diameter of the shield tunnel as inputs to the control strategy model, and the position of the key ring and the critical length of the reinforcement unit as outputs; Training the control strategy model using the training set; Based on the trained control strategy model, the shield tunnel continuous destruction control strategy is output.

5. The method for controlling continuous destruction of a shield tunnel according to claim 1, characterized in that: The destruction range threshold of the current shield tunnel is determined by the buried depth and outer diameter of the current shield tunnel, specifically: Determine a damage range threshold relationship by collecting historical data or performing numerical simulations; the damage range threshold relationship is used to represent the corresponding relationship between the buried depth and outer diameter of each shield tunnel and the damage range threshold; According to the buried depth and outer diameter of the current shield tunnel, a damage range threshold relationship is found to determine the damage range threshold of the current shield tunnel.

6. The method for controlling continuous destruction of a shield tunnel according to claim 1, characterized in that: The reinforcement operation of the reinforcement unit includes the inter-ring reinforcement operation of the tunnel segment and the intra-ring reinforcement operation of the tunnel segment.

7. A shield tunnel continuous destruction control system, which implements a shield tunnel continuous destruction control method according to any one of claims 1 to 6, characterized in that: The control system includes a damage range threshold module, a current shield tunnel information acquisition module, and a continuous damage control strategy output module: A damage range threshold module is used to obtain the current shield tunnel's buried depth and outer diameter; determine the current shield tunnel's damage range threshold based on the current shield tunnel's buried depth and outer diameter; the damage range threshold is used to represent the minimum number of damaged segments that will cause continuous damage at the current buried depth and outer diameter; The current shield tunnel information acquisition module is used to obtain the location of the current initial local damage in the shield tunnel and the number of damaged segments; The continuous damage control strategy output module determines the position of the critical ring and the critical length of the reinforcement unit based on the occurrence location and the continuous damage control strategy of the shield tunnel if the number of damaged segment rings exceeds the damage range threshold; the position of the critical ring is the position where the reinforcement unit is set; and the critical length of the reinforcement unit is the number of rings of the reinforcement unit.

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