A method for a double shield TBM to get out of trouble in a surrounding rock convergence deformation jam

Abstract

The application discloses a kind of double shield TBM in surrounding rock convergence deformation jamming in the method for handling to get out of trouble, comprising the following steps: one, in shield body inside erecting operation platform;Two, in tail shield waist part is equipped with construction opening;Three, excavation horizontal pilot tunnel;Four, support horizontal pilot tunnel;Five, shield body two sides upper interval excavation;Six, cut off shield body connection support body and carry out TBM to get out of trouble.The application construction method is simple, by telescopic shield left and right side observation window and tail shield waist in construction opening, first excavate two horizontal pilot tunnels, then by using staggered excavation way from two sides of horizontal pilot tunnel to shield body upper center position excavation, both sides horizontal pilot tunnel is connected, to realize, make front shield and front shield tail shell upper unloading, to release the stress of surrounding rock, avoid shield body upper surrounding rock collapse risk, simultaneously, horizontal pilot tunnel excavation period is realized excavation, support simultaneously, guarantee work safety, reduce construction risk, reduce construction difficulty, reduce processing cost.

Description

Technical Field

[0001] This invention belongs to the field of tunnel construction technology, specifically relating to a method for freeing a double-shield TBM from getting stuck in the surrounding rock convergence deformation. Background Technology

[0002] TBMs are construction machinery for rapid tunnel excavation, with over 50 years of development history abroad. They come in a wide variety of types, have well-established construction technologies, enhanced adaptability to different rock formations, and faster excavation speeds. With the widespread application of TBMs, various types and specifications are increasingly used in industries such as mountain tunnels and water diversion projects, making them the preferred tunnel excavation machinery worldwide.

[0003] During TBM construction, the diversity of geological types can lead to various adverse geological conditions, causing construction difficulties. Based on current domestic and international case studies of dual-shield TBMs in tunnel construction, most projects encountering rock convergence deformation and jamming require openings in the installed tunnel segments. Personnel enter the TBM's tail shield through these openings to excavate the converging rock, releasing pressure on the shield and allowing the TBM to escape. However, this method is extremely difficult because the tunnel segments are mostly made of high-strength concrete. Furthermore, damaging the installed top tunnel segments will affect the lining strength of the entire ring. When the alteration stress of the surrounding rock exceeds the supporting capacity of the damaged segments, it will threaten the TBM, potentially causing burial and significant economic losses. The main problems associated with this method are high construction difficulty, high construction risk, long processing time, and high processing costs. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a method for extricating a double-shield TBM from a stuck position due to rock convergence deformation. The construction method is simple. Two horizontal guide tunnels are first excavated through the observation windows on both sides of the telescopic shield and the construction opening in the waist of the tail shield. Then, by using a staggered excavation method, excavation is carried out from the horizontal guide tunnels on both sides towards the center of the shield body. This results in the excavation area and the retention area being sequentially and intersecting on both sides of the shield body. This achieves the connection between the horizontal guide tunnels on both sides, unloads the upper part of the front shield and the tail shell of the front shield to release the stress of the surrounding rock, and avoids the risk of the surrounding rock collapsing above the shield body. At the same time, excavation and support are carried out simultaneously during the excavation of the horizontal guide tunnels, ensuring work safety, reducing construction risks, reducing construction difficulty, and reducing processing costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for extricating a double-shield TBM from a rock convergence deformation jam, characterized in that the method includes the following steps:

[0006] Step 1: Erect a working platform inside the shield;

[0007] Step 2: Create a construction opening at the waist of the tail shield: Use a cutting torch to create a construction opening on both the left and right sides of the tail shield;

[0008] Step 3: Excavate horizontal pilot tunnels: Open the observation windows on the left and right sides of the telescopic shield. Based on the working platform erected inside the shield, use pneumatic picks to excavate the surrounding rock on the left and right sides of the shield from the two observation windows and the construction opening to form two horizontal pilot tunnels.

[0009] During the excavation of the horizontal pilot tunnel, the convergence deformation of the excavated surrounding rock is monitored at set intervals.

[0010] Step 4: Supporting the horizontal pilot tunnel: During the excavation of the horizontal pilot tunnel, after each set length of excavation, steel sections, jacks, square timber, and formwork are used to support the excavated section.

[0011] Step 5: Intermittent excavation on both sides of the shield: After the horizontal guide tunnels on both sides of the shield have been excavated, cross excavation is carried out towards the center of the shield using the two horizontal guide tunnels.

[0012] When using two horizontal guide tunnels to cross-excavate towards the center of the shield body, the horizontal guide tunnel on one side of the shield body is used to excavate towards the center of the shield body. The excavation unit length is used as the excavation area, and the retention unit length is used as the retention area. This results in the excavation area and retention area being staggered after the excavation on one side of the shield body is completed. The excavation areas on both sides of the shield body are staggered, and the retention areas on both sides of the shield body are staggered.

[0013] Step Six: Cut off the support structure connected to the shield and extricate the TBM from its predicament: After the cross-excavation of the surrounding rock above the shield is completed, cut off the support structure connected to the shield to avoid affecting the TBM's extrication. Then, seal the two observation windows and the construction opening, remove the working platform inside the shield, start the TBM equipment, and extricate the TBM from its predicament due to the convergence deformation of the surrounding rock.

[0014] The above-mentioned method for handling the entrapment of a double-shield TBM in a rock convergence deformation jam is characterized by the following: in step one, when setting up the working platform inside the shield, the equipment, cables and oil pipes inside the shield are protected simultaneously.

[0015] The above-mentioned method for handling the entrapment of a double-shield TBM in a converging deformation machine in surrounding rock is characterized in that: in step three, the surrounding rock debris excavated during the excavation of the horizontal guide tunnel is poured onto the main machine belt and transported to the outside of the tunnel via the belt system.

[0016] The above-mentioned method for extricating a double-shield TBM from a stuck position due to rock convergence deformation is characterized in that: in step three, when excavating the surrounding rock on both sides of the shield body through the observation window, excavation is carried out simultaneously from the observation window towards the cutterhead and the tail shield. When excavating the surrounding rock on both sides of the shield body through the construction port, excavation is carried out from the construction port towards the telescopic shield until all horizontal guide tunnels on both sides from the cutterhead to the tail shield are excavated.

[0017] The above-mentioned method for escaping a double-shield TBM stuck in a converging deformation machine in surrounding rock is characterized in that: in step four, during the excavation of the horizontal guide tunnel, support is provided for the excavated portion after every 600mm to 1000mm of excavation.

[0018] The above-mentioned method for escaping a double-shield TBM stuck in a rock convergence deformation machine is characterized in that: in step five, when using the horizontal guide tunnels on both sides to cross-excavate towards the center position above the shield body, the upward excavation height at the center position above the shield body is 500mm to 600mm.

[0019] The above-mentioned method for handling the entrapment of a double-shield TBM in the surrounding rock convergence deformation is characterized in that: in step five, when the horizontal guide tunnels on both sides are excavated at the center position above the shield body, the center line of the shield body is used as the reference.

[0020] The above-mentioned method for handling the entrapment of a double-shield TBM in a rock convergence deformation jam is characterized in that: in step six, after starting the TBM equipment, the TBM cutterhead speed is 2r / min to 3r / min, and the tunneling is mainly carried out in single-shield mode with double-shield assistance.

[0021] The above-mentioned method for handling the entrapment of a double-shield TBM in the surrounding rock convergence deformation is characterized by the following: In step six, if the TBM still cannot escape after the TBM is started, the observation window on the telescopic shield needs to be reopened, the loose debris generated by the vibration during TBM excavation needs to be cleared, the horizontal guide tunnels on both sides of the shield need to be re-supported, and the rock in the reserved area above both sides of the shield needs to be excavated. During excavation, the surrounding rock above the shield needs to be supported with structural steel, square timber, and wooden planks to prevent collapse. After all excavation is completed, the TBM should be restarted according to the method in step six, and the TBM entrapment should be performed again.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. This invention opens a construction port on both the left and right sides of the tail shield, which facilitates the excavation of the surrounding rock by construction personnel. Through the two observation windows and the construction port, excavation can be carried out simultaneously from the middle and rear of the shield. In the process of freeing the double-shield TBM from the surrounding rock convergence deformation jamming, it is possible to excavate the horizontal guide tunnel on four working faces at the same time, realize the rapid freeing of the TBM and shorten the processing period.

[0024] 2. This invention allows for excavation outside the shield body through observation windows on both sides of the telescopic shield and construction openings in the waist of the tail shield, avoiding damage to the installed segments. Furthermore, the construction openings on the tail shield are located in the waist area, so they do not affect the overall structure of the tail shield.

[0025] 3. By excavating horizontal guide tunnels first, the load on both sides of the shield body can be unloaded, which facilitates the excavation of the surrounding rock above the shield body through the horizontal guide tunnels, ensuring construction safety. At the same time, the two horizontal guide tunnels can serve as muck removal channels, facilitating muck removal during the excavation process.

[0026] 3. This invention employs a staggered excavation method, excavating from the horizontal guide tunnels on both sides towards the center of the shield body. This results in the excavation zone and the preservation zone being sequentially and intersecting above both sides of the shield body. This achieves the connection between the horizontal guide tunnels on both sides, allowing the upper part of the front shield and the tail shell of the front shield to be unloaded, thereby releasing the stress of the surrounding rock. It also avoids the risk of the surrounding rock collapsing above the shield body. At the same time, during the excavation of the horizontal guide tunnels, excavation and support are carried out simultaneously, ensuring work safety, reducing construction risks, reducing construction difficulty, and reducing processing costs.

[0027] In summary, the construction method of this invention is simple. By using the observation windows on both sides of the telescopic shield and the construction opening in the waist of the tail shield, two horizontal guide tunnels are first excavated. Then, by using an alternating excavation method, excavation is carried out from the horizontal guide tunnels on both sides towards the center of the shield body. This results in the excavation area and the preservation area being sequentially and intersecting on both sides of the shield body. This achieves the connection between the horizontal guide tunnels on both sides, unloads the upper part of the front shield and the tail shell of the front shield to release the stress of the surrounding rock, and avoids the risk of collapse of the surrounding rock above the shield body. At the same time, during the excavation of the horizontal guide tunnels, excavation and support are carried out simultaneously, ensuring work safety, reducing construction risks, reducing construction difficulty, and reducing processing costs.

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 This is a flowchart of the present invention.

[0030] Figure 2 This is a top view of the horizontal pilot tunnel excavation of the present invention.

[0031] Figure 3 This is a cross-sectional view of the horizontal pilot tunnel excavation of the present invention.

[0032] Figure 4 This is a top view of the excavation at the top of both sides of the shield body of the present invention.

[0033] Figure 5 This is a side view of the excavation at the top of the shield body according to the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1—Cutterhead; 2—Front shield; 3—Retractable shield;

[0036] 4—Stretch shield; 5—Tail shield; 6—Observation window;

[0037] 7—Construction entrance; 8—Horizontal pilot tunnel; 9—Excavation area;

[0038] 10—Reserved Area. Detailed Implementation

[0039] like Figures 1 to 5 The method for escaping a double-shield TBM stuck in surrounding rock convergence deformation is shown, characterized by the following steps:

[0040] Step 1: Erect a working platform inside the shield;

[0041] Step 2: Create a construction opening at the waist of the tail shield: Use a cutting torch to create a construction opening 7 on both the left and right sides of the tail shield 5;

[0042] Step 3: Excavation of Horizontal Pilot Tunnels: Open the observation windows 6 on both sides of the telescopic shield 3. Based on the working platform erected inside the shield, use pneumatic drills to excavate the surrounding rock on both sides of the shield through the two observation windows 6 and the construction opening 7 to form two horizontal pilot tunnels 8. Figure 2 and Figure 3 As shown;

[0043] During the excavation of horizontal pilot tunnel 8, the convergence deformation of the excavated surrounding rock was monitored at set intervals.

[0044] Step 4: Supporting the horizontal pilot tunnel: During the excavation of the horizontal pilot tunnel 8, after each set length of excavation, steel sections, jacks, square timber, and formwork are used to support the excavated portion.

[0045] Step 5: Intermittent excavation above both sides of the shield: After the horizontal guide tunnels 8 on both sides of the shield have been excavated, the construction workers use the two horizontal guide tunnels 8 to cross-excavate towards the center of the shield from the erected work platform.

[0046] Among them, such as Figures 3 to 5 As shown, when the horizontal guide tunnels 8 on both sides are excavated in a cross manner towards the center position above the shield body, when the horizontal guide tunnel 8 on one side of the shield body is excavated towards the center position above the shield body, the excavation unit length is used as the excavation area 9, and the retention unit length is used as the retention area 10. This makes the excavation area 9 and the retention area 10 staggered after the excavation on one side of the shield body is completed, and the excavation areas 9 on both sides of the shield body are staggered, and the retention areas 10 on both sides of the shield body are staggered.

[0047] The center position above the shield body refers to the position on the vertical center line above the shield body, with a unit length of 1000mm.

[0048] It should be noted that when excavating the excavation areas 9 on both sides of the shield body, a cross-excavation method is adopted. First, one excavation area 9 on one side is excavated, and then the other excavation area 9 on the other side is excavated.

[0049] Step 6: Cut off the support structure connected to the shield and extricate the TBM from its predicament: After the cross-excavation of the surrounding rock above the shield is completed, cut off the support structure connected to the shield to avoid affecting the TBM's extrication. Then, seal the two observation windows 6 and the construction opening 7. After removing the working platform inside the shield, start the TBM equipment to extricate the TBM from its predicament due to the convergence deformation of the surrounding rock.

[0050] In actual use, the construction port 7 is a 500mm*500mm square opening. By opening a construction port 7 on both the left and right sides of the tail shield 5, it is convenient for construction personnel to excavate the surrounding rock of the shield body. Through the two observation windows 6 and the construction port 7, excavation can be carried out simultaneously from the middle and rear of the shield body. In the process of extricating the double-shield TBM from the surrounding rock convergence deformation jam, it is possible to excavate the horizontal guide tunnel on four working faces at the same time, realize the rapid extrication of the TBM and shorten the processing period.

[0051] It should be noted that excavation is carried out by entering the outer side of the shield body through the observation windows 6 on the left and right sides of the telescopic shield 3 and the construction port 7 in the waist of the tail shield 5, which avoids damaging the installed segments. Moreover, the construction port 7 on the tail shield 5 is located in the waist part and does not affect the overall structure of the tail shield 5.

[0052] In this embodiment, since the observation window 6 is set in the waist of both sides of the telescopic shield 3, a horizontal guide tunnel 8 is first excavated on each side of the shield body. Excavating the horizontal guide tunnel 8 first can unload the load on both sides of the shield body, facilitate the excavation of the surrounding rock above the shield body through the horizontal guide tunnel 8, ensure construction safety, and at the same time, the two horizontal guide tunnels 8 can serve as slag discharge channels to facilitate slag discharge during the excavation process.

[0053] In actual use, by adopting an interleaved excavation method, excavation is carried out from the horizontal guide tunnels 8 on both sides towards the center of the shield body. This results in the excavation zone 9 and the retention zone 10 being intersected on both sides of the shield body. This not only connects the horizontal guide tunnels 8 on both sides, allowing the front shield and the upper part of the front shield tail shell to unload and release the stress of the surrounding rock, but also avoids the risk of the surrounding rock collapsing above the shield body. At the same time, during the excavation of the horizontal guide tunnels 8, excavation and support are carried out simultaneously, ensuring work safety, reducing construction risks, reducing construction difficulty, and reducing processing costs.

[0054] In practice, during step one, when setting up the work platform inside the shield, the equipment, cables, and oil pipes inside the shield should be protected simultaneously.

[0055] In actual use, the work platform is constructed using scaffolding and bamboo plywood, which makes it easy for construction workers to stand and carry out rock excavation.

[0056] In practice, to prevent damage to cables and oil pipes during the excavation of the surrounding rock outside the shield, fireproof cloth and other materials are used to protect the equipment, cables, and oil pipes inside the shield, while also protecting the pipe connections.

[0057] In specific implementation, during step three, when excavating the horizontal pilot tunnel 8, the excavated surrounding rock debris is poured onto the main conveyor belt and transported to the outside of the tunnel via the conveyor belt system.

[0058] In actual use, the excavation height of the horizontal guide tunnel 8 is 1500mm, the excavation width of the horizontal guide tunnel 8 is 1200mm, and the horizontal guide tunnel 8 is not higher than the top of the shield body.

[0059] In specific implementation, in step three, when excavating the surrounding rock on both sides of the shield body through the observation window 6, excavation is carried out simultaneously from the observation window 6 towards the direction of the cutterhead 1 and the direction of the tail shield 5. When excavating the surrounding rock on both sides of the shield body through the construction port 7, excavation is carried out from the construction port 7 towards the direction of the telescopic shield until all horizontal guide tunnels 8 on both sides of the cutterhead 1 to the tail shield 5 are excavated.

[0060] In actual use, when excavating the surrounding rock on both sides of the shield body, two teams of workers simultaneously excavate at the observation window 6, one towards the cutterhead 1 and the other towards the tail shield 5. When excavating towards the cutterhead 1, the excavation continues until the junction of the front shield 2 and the cutterhead 1 is reached. When excavating towards the tail shield 5, the excavation stops when the excavation from the observation window 6 towards the tail shield 5 and the excavation from the construction opening 7 towards the telescopic shield 3 reach the same position. That is, the completed horizontal guide tunnel 8 passes through the outer side of the front shield 2, the telescopic shield 3, and the outer side of the tension shield 4 in sequence and extends to the outer side of the tail shield 5.

[0061] In specific implementation, in step four, during the excavation of the horizontal guide tunnel 8, support is provided for the excavated portion after every 600mm to 1000mm of excavation.

[0062] In this embodiment, during the excavation of the horizontal pilot tunnel 8, steel sections, jacks, wooden planks, and square timber are used for support, ensuring that excavation and support are carried out simultaneously. Excavation can only continue after reliable support is achieved. If the surrounding rock is broken, a support method of wire mesh spraying and concrete installation with steel reinforcement bars is adopted to ensure the safety of workers. During the support treatment, a low-speed fan is used to supply fresh air into the horizontal pilot tunnel 8 to ensure the safety of workers. If the surrounding rock at the excavation site of the horizontal pilot tunnel 8 is extremely broken and cannot be supported by conventional methods, manual excavation is immediately stopped, and chemical grouting is performed on the area requiring treatment before excavation resumes.

[0063] In specific implementation, in step five, when using the horizontal guide tunnels 8 on both sides to cross-excavate towards the center position above the shield body, the upward excavation height at the center position above the shield body is 500mm to 600mm.

[0064] In actual use, during the excavation of the surrounding rock above the horizontal pilot tunnel 8 and both sides of the shield, maintenance personnel need to check the equipment operation status daily, troubleshoot equipment malfunctions, and be ready for TBM tunneling at all times.

[0065] In specific implementation, in step five, when the horizontal guide tunnels 8 on both sides are excavated at the center position above the shield body, the center line of the shield body is used as the reference.

[0066] In actual use, excavation is carried out with the centerline of the shield as the reference. That is, when the horizontal guide tunnel 8 on one side of the shield is excavated upwards from the shield, the bottom of the excavation area 9 is expanded from the horizontal guide tunnel 8 to the centerline of the shield and no further expansion is carried out to the other side.

[0067] In specific implementation, in step six, after starting the TBM equipment, in order to reduce the disturbance to the surrounding rock when the cutterhead rotates and to ensure the overall stability of the upper section support system, the TBM cutterhead speed is set to 2r / min to 3r / min. At the same time, the tunneling is mainly carried out in a single shield mode, with double shields as an auxiliary method.

[0068] In actual use, after starting the TBM equipment, the tunneling is mainly carried out in single shield mode with double shield as an auxiliary method. The tunneling parameters are adjusted in a timely manner according to the principle of "low speed, low thrust, low penetration, and continuous tunneling" and combined with the slag discharge of the belt conveyor, and attempts are made to get the machine out of the surrounding rock convergence deformation.

[0069] In specific implementation, in step six, if the TBM still cannot get out of trouble after the TBM equipment is started, the observation window 6 on the telescopic shield 3 needs to be reopened, the loose debris generated by the vibration during the TBM excavation needs to be cleared, the horizontal guide tunnels 8 on both sides of the shield need to be re-supported, and the rock in the reserved area 10 above both sides of the shield needs to be excavated. During excavation, the surrounding rock above the shield needs to be supported with steel, square timber, and wooden planks to prevent collapse. After all excavation is completed, the TBM equipment should be restarted according to the method in step six, and the TBM should be freed from trouble again.

[0070] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for escaping a double-shield TBM stuck in surrounding rock convergence deformation, characterized in that, The method includes the following steps: Step 1: Erect a working platform inside the shield; Step 2: Open a construction port at the waist of the tail shield: Use a cutting torch to open a construction port (7) on both the left and right sides of the tail shield (5). Step 3: Excavate horizontal pilot tunnels: Open the observation windows (6) on the left and right sides of the telescopic shield (3). Based on the working platform built inside the shield, use a pneumatic pick to excavate the surrounding rock on the left and right sides of the shield to form two horizontal pilot tunnels (8) from the two observation windows (6) and the construction opening (7). During the excavation of the horizontal guide tunnel (8), the convergence deformation of the excavated surrounding rock is monitored at set intervals. Step 4, Supporting the horizontal pilot tunnel: During the excavation of the horizontal pilot tunnel (8), after each set length of excavation, steel sections, jacks, square timber and formwork are used to support the excavated part; Step 5: Cross excavation above both sides of the shield: After the horizontal guide tunnels (8) on both sides of the shield are excavated, cross excavation is carried out towards the center of the shield using the two horizontal guide tunnels (8); When using two horizontal guide tunnels (8) to cross-excavate towards the center of the shield body, the horizontal guide tunnel (8) on one side of the shield body is excavated towards the center of the shield body. The excavation unit length is used as the excavation area (9), and the retention unit length is used as the retention area (10). This makes the excavation area (9) and the retention area (10) staggered after the excavation on one side of the shield body is completed. The excavation area (9) on one side of the shield body is staggered with the excavation area (9) on the other side of the shield body, and the retention area (10) on one side of the shield body is staggered with the retention area (10) on the other side of the shield body. Step 6: Cut off the support structure connected to the shield and extricate the TBM: After the cross excavation of the surrounding rock above the shield is completed, cut off the support structure connected to the shield to avoid affecting the TBM's extrication. Then, seal the two observation windows (6) and the construction opening (7). After removing the working platform inside the shield, start the TBM equipment to extricate the TBM from the surrounding rock convergence deformation.

2. The method for escaping a double-shield TBM stuck in surrounding rock convergence deformation according to claim 1, characterized in that: In step one, while setting up the work platform inside the shield, the equipment, cables, and oil pipes inside the shield should be protected simultaneously.

3. The method for escaping a double-shield TBM stuck in a converging deformation rock formation according to claim 1, characterized in that: In step three, the excavated surrounding rock debris during the excavation of the horizontal pilot tunnel (8) is poured onto the main conveyor belt and transported to the outside of the tunnel via the conveyor belt system.

4. A method for escaping a double-shield TBM stuck in a rock convergence deformation machine as described in claim 1, characterized in that: In step three, when excavating the surrounding rock on both sides of the shield body through the observation window (6), excavation is carried out simultaneously from the observation window (6) towards the cutterhead (1) and the tail shield (5). When excavating the surrounding rock on both sides of the shield body through the construction port (7), excavation is carried out from the construction port (7) towards the telescopic shield until all horizontal guide tunnels (8) on both sides of the cutterhead (1) to the tail shield (5) are excavated.

5. A method for escaping a double-shield TBM stuck in a rock convergence deformation machine according to claim 1, characterized in that: In step four, during the excavation of the horizontal guide tunnel (8), support is provided for the excavated portion after every 600mm to 1000mm of excavation.

6. A method for escaping a double-shield TBM stuck in surrounding rock convergence deformation according to claim 1, characterized in that: In step five, when using the horizontal guide tunnels (8) on both sides to cross-excavate towards the center position above the shield, the upward excavation height at the center position above the shield is 500mm to 600mm.

7. A method for escaping a double-shield TBM stuck in a rock convergence deformation machine according to claim 1, characterized in that: In step five, when the horizontal guide tunnels (8) on both sides are excavated at the center position above the shield body, the center line of the shield body is used as the reference.

8. A method for escaping a double-shield TBM stuck in a converging deformation rock formation according to claim 1, characterized in that: In step six, after starting the TBM equipment, the TBM cutterhead speed is set to 2r / min to 3r / min, and the tunneling is mainly carried out in single-shield mode with double-shield assistance.

9. A method for escaping a double-shield TBM stuck in surrounding rock convergence deformation according to claim 1, characterized in that: In step six, if the TBM still cannot get out of trouble after the TBM equipment is started, the observation window (6) on the telescopic shield (3) needs to be reopened, the loose debris generated by the vibration during the TBM excavation needs to be cleared, the horizontal guide tunnels (8) on both sides of the shield need to be re-supported, and the rocks in the reserved area (10) above both sides of the shield need to be excavated. During the excavation, the surrounding rock above the shield needs to be supported with steel, square timber, and wooden planks to prevent collapse. After all the excavation is completed, the TBM equipment should be restarted according to the method in step six, and the TBM should be freed from the jam again.

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