Shield receiving section tunneling control method

Abstract

The invention discloses a shield receiving section tunneling control method, and relates to the technical field of shield construction.The shield receiving section tunneling control method comprises the steps that after a shield tunneling machine enters a receiving section, the advancing speed and the rotating speed of a cutterhead are reduced; the shield tunneling machine continues to conduct tunneling, when the distance between the shield tunneling machine and the tunnel portal is a first preset distance, tunneling of the transition section is ended, and station entering operation is started; after the shield tunneling machine enters the reinforcing body, the soil bin pressure of the shield tunneling machine is gradually reduced; when the distance between the cutterhead and the tunnel portal is a second preset distance, grinding the diaphragm wall at a preset grinding speed; and after grinding of the underground diaphragm wall is completed, the shield tunneling machine continues to be propelled until the shield tunneling machine completely goes out of the hole and is completely contained in the steel sleeve. By accurately controlling the shield tunneling machine in the tunneling process of the receiving section, the tunneling efficiency and safety of the shield tunneling machine under different geological conditions are effectively improved, and the construction risk is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of shield construction, in particular to a shield receiving section excavation control method. Background Art

[0002] With the acceleration of urbanization and the growing demand for underground engineering, the tunneling technology of shield machines, a key piece of tunnel construction equipment, has rapidly developed. From early manual control to modern automated and intelligent management, tunneling control of the shield receiving section has gradually evolved into a complex, systematic engineering process.

[0003] Currently, tunneling control methods for the receiving section of a shield tunnel primarily rely on a combination of sensor networks and real-time data analysis. By deploying multiple sensors on the shield machine, the soil, construction environment, and the machine's operating status are monitored in real time. This data is then collected and analyzed through an intelligent control system to achieve precise control.

[0004] However, the existing data analysis model has a single function and poor applicability to different types of soil layers, which reduces the safety and economy of the entire shield construction process. Summary of the Invention

[0005] The main purpose of this invention is to propose a shield receiving section excavation control method, aiming to improve the adaptability of the shield construction process to complex geological conditions and ensure the safety and economy of the shield construction.

[0006] To achieve the above-mentioned purpose, the present invention proposes a shield receiving section excavation control method, which includes:

[0007] After the shield machine enters the receiving section, the propulsion speed and the cutter head rotation speed are reduced;

[0008] The shield machine continues to excavate, and when the distance between the shield machine and the tunnel portal reaches a first preset distance, the excavation of the transition section is terminated and the entry operation is started;

[0009] After the shield machine enters the reinforcement body, gradually reducing the soil bin pressure of the shield machine;

[0010] When the distance between the cutter head and the tunnel door is a second preset distance, grinding the ground-connected wall at a preset grinding speed;

[0011] After the ground-connected wall is ground, the shield machine is continuously advanced until the shield machine is completely out of the hole and completely accommodated in the steel sleeve.

[0012] In one embodiment, after the shield machine enters the receiving section, the step of reducing the propulsion speed and the cutterhead rotation speed includes:

[0013] After the shield machine enters the receiving section, the propulsion speed of the shield machine is reduced from 50 mm / min to 70 mm / min to 30 mm / min to 20 mm / min;

[0014] The rotation speed of the cutter disc is reduced from 1.0 rpm to 1.5 rpm to 0.5 rpm to 0.8 rpm.

[0015] In one embodiment, after the shield machine enters the reinforcement body, before the step of gradually reducing the soil bin pressure of the shield machine, the shield receiving section excavation control method further includes:

[0016] The reinforcement body is formed by grouting in the soil around the tunnel portal.

[0017] In one embodiment, after the shield machine enters the reinforcement body, the step of gradually reducing the soil bin pressure of the shield machine includes:

[0018] After the shield machine enters the reinforcement body, the soil bin pressure of the shield machine is reduced from 2.6 bar to 2.8 bar to 0.6 bar to 0.8 bar.

[0019] In one embodiment, when the distance between the cutterhead and the portal is a second preset distance, the step of grinding the ground-connected wall at a preset grinding speed includes:

[0020] When the distance between the cutter head and the tunnel portal is a second preset distance, the ground-connected wall is ground at a preset grinding speed, and the penetration of the shield machine is controlled to be A, A≤5mm / r.

[0021] In one embodiment, before the step of grinding the ground-connected wall at a preset grinding speed when the distance between the cutterhead and the tunnel portal is a second preset distance, the shield receiving section excavation control method further includes:

[0022] After the shield machine enters the reinforcement body, the penetration rate of the shield machine is controlled to be 5mm / r to 10mm / r, and the thrust of the shield machine is controlled to be 1000kN to 1500kN.

[0023] In one embodiment, after the ground-connected wall grinding is completed, before the step of continuing to advance the shield machine until the shield machine is completely out of the hole and completely accommodated in the steel sleeve, the shield receiving section excavation control method includes:

[0024] Before the shield machine exits the tunnel, the segments that have exited the 5-ring shield tail of the shield machine are subjected to full-ring secondary grouting through grouting holes using cement slurry and water glass slurry until slurry comes out of the grouting holes, and the grouting pressure of the full-ring secondary grouting is controlled to be 0.3 MPa to 0.5 MPa; wherein the water-cement ratio of the cement slurry is 1:1, and the volume ratio of the cement slurry to the water glass slurry is 1:1.

[0025] In one embodiment, the preset grinding speed is 2 mm / min to 5 mm / min.

[0026] In one embodiment, the first preset distance is 13 m.

[0027] In one embodiment, the second preset distance is 1.5 m.

[0028] The technical solution of the present invention effectively controls multiple stages of the shield machine's tunneling process during the receiving section, improving its tunneling efficiency and safety under diverse geological conditions. Specifically, by reducing the propulsion speed and cutterhead rotational speed, disturbance to the surrounding soil is reduced, enhancing construction stability. Furthermore, as the shield machine gradually approaches the tunnel portal and maintains distance control, structural damage is avoided, thereby reducing construction risks. Furthermore, after entering the reinforcement body, the gradual reduction of soil bin pressure helps alleviate soil reaction forces, ensuring smooth tunneling. When the distance between the cutterhead and the tunnel portal reaches a preset value, a grinding operation is implemented, effectively improving the efficiency and safety of the grinding process, thereby enhancing the shield machine's escape capability and reducing construction costs. Ultimately, ensuring precise propulsion during the final stage allows the shield machine to smoothly exit the tunnel portal and be housed within the steel sleeve, enhancing the overall stability of the tunnel structure, simplifying subsequent construction operations, and ensuring smooth project progress. This solution effectively addresses the limited adaptability and high construction risks of existing technologies, improving the efficiency and safety of underground projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 A schematic flow chart of an embodiment of a shield receiving section excavation control method provided by the present invention;

[0031] Figure 2 for Figure 1 Detailed flow chart of step S10;

[0032] Figure 3 for Figure 1 Detailed flow chart of step S30;

[0033] Figure 4 for Figure 1 Detailed flow chart of step S40 in FIG.

[0034] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] With the acceleration of urbanization and the growing demand for underground engineering, the tunneling technology of shield machines, a key piece of tunnel construction equipment, has rapidly developed. From early manual control to modern automated and intelligent management, tunneling control of the shield receiving section has gradually evolved into a complex, systematic engineering process.

[0039] Currently, tunneling control methods for the receiving section of a shield tunnel primarily rely on a combination of sensor networks and real-time data analysis. By deploying multiple sensors on the shield machine, the soil, construction environment, and the machine's operating status are monitored in real time. This data is then collected and analyzed through an intelligent control system to achieve precise control.

[0040] However, the existing data analysis model has a single function and poor applicability to different types of soil layers, which reduces the safety and economy of the entire shield construction process.

[0041] In order to solve this technical problem, the present invention proposes a shield receiving section excavation control method.

[0042] See also Figure 1 In one embodiment of the present invention, the shield receiving section excavation control method includes:

[0043] Step S10: After the shield machine enters the receiving section, the propulsion speed and the cutterhead speed are reduced;

[0044] Step S20: the shield machine continues to excavate. When the distance between the shield machine and the tunnel portal reaches a first preset distance, the excavation of the transition section is terminated and the entry operation is started.

[0045] Step S30: After the shield machine enters the reinforcement body, gradually reduce the soil bin pressure of the shield machine;

[0046] Step S40: When the distance between the cutter head and the tunnel door is a second preset distance, grinding the ground-connected wall at a preset grinding speed;

[0047] Step S50: After the ground-connected wall is ground, the shield machine is continuously advanced until the shield machine is completely out of the hole and completely accommodated in the steel sleeve.

[0048] Specifically, in step S10, once the shield machine enters the receiving section, it first reduces its propulsion speed and cutterhead rotational speed. This operation aims to reduce the impact force on the shield machine in the receiving section, allowing the shield machine to tunnel in a relatively gentle environment. Because the geological conditions in the receiving section may differ from the stable environment of tunneling, reducing the propulsion speed allows the shield machine to better adapt to geological changes, thereby reducing disturbance to the surrounding soil and improving construction safety.

[0049] Next, during step S20, the shield machine continues tunneling. When the distance between the shield machine and the tunnel portal reaches a first preset distance, tunneling in the transition section ends and the entry operation begins. This operation ensures that the distance between the shield machine and the tunnel portal remains within a reasonable range, avoiding structural damage or instability caused by excessive distance. Precise distance control effectively reduces construction risks caused by unstable ground.

[0050] In step S30, after the shield machine enters the reinforcement mass, it gradually reduces the soil bunker pressure. This process is intended to prevent soil instability caused by excessive pressure. By gradually reducing the soil bunker pressure, the reaction force of the soil layer is alleviated, preventing unexpected situations during the project and ensuring smooth excavation operations.

[0051] Then, in step S40, when the distance between the cutterhead and the tunnel portal reaches a second preset distance, the ground-connected wall is ground at a preset grinding speed. This grinding operation ensures smooth and efficient grinding by controlling the distance between the cutterhead and the wall and the grinding speed, while also effectively improving the shield machine's escape capability. Proper control of grinding speed and distance helps reduce construction costs and time, thereby improving the overall economic efficiency of the project.

[0052] Finally, in step S50, after grinding the ground-anchored wall, the shield machine continues to advance until it is completely out of the tunnel and completely contained within the steel sleeve. This stage of operation ensures the proper fit between the shield machine and the tunnel, thereby enhancing the overall stability of the tunnel structure. By allowing the shield machine to exit the tunnel smoothly, it simplifies subsequent processes and ensures the smooth progress of the entire project.

[0053] The technical solution provided by the present invention effectively controls multiple stages of the shield machine's tunneling process during the shield receiving section, improving its tunneling efficiency and safety under various geological conditions. Specifically, by reducing the propulsion speed and cutterhead rotation speed, disturbance to the surrounding soil can be reduced, enhancing construction stability. Furthermore, as the shield machine gradually approaches the tunnel portal and maintains distance control, structural damage is avoided, thereby reducing construction risks. Furthermore, after entering the reinforcement body, the gradual reduction of soil bin pressure helps alleviate the reaction force of the soil layer, ensuring smooth tunneling. When the distance between the cutterhead and the tunnel portal reaches a preset value, the grinding operation is implemented, effectively improving the efficiency and safety of the grinding process, thereby enhancing the shield machine's escape capability and reducing construction costs. Finally, ensuring precise propulsion during the final stage allows the shield machine to smoothly exit the tunnel portal and be accommodated within the steel sleeve, enhancing the overall stability of the tunnel structure, simplifying subsequent construction operations, and ensuring smooth project progress. This solution effectively addresses the limited adaptability and high construction risks of existing technologies, improving the construction efficiency and safety of underground projects.

[0054] Please continue reading Figure 1 , and see Figure 2 In an embodiment of the present invention, after the shield machine enters the receiving section, the step of reducing the propulsion speed and the cutterhead speed includes:

[0055] Step S11: After the shield machine enters the receiving section, the propulsion speed of the shield machine is reduced from 50 mm / min to 70 mm / min to 30 mm / min to 20 mm / min;

[0056] Step S12: reducing the cutter head rotation speed from 1.0 rpm to 1.5 rpm to 0.5 rpm to 0.8 rpm.

[0057] Specifically, in step S11, after entering the receiving section, the shield machine reduces its propulsion speed from 50mm / min to 70mm / min to 30mm / min to 20mm / min. This adjustment allows the shield machine to operate at a lower speed during excavation in the receiving section, thereby reducing disturbance to the surrounding soil. Because the receiving section often has unstable geological conditions, reducing the propulsion speed allows the shield machine to adapt to these changes more gently, reducing the risk of soil displacement and surface subsidence during construction, thereby improving the safety of the entire construction process.

[0058] Next, in step S12, the cutterhead rotational speed is reduced from 1.0 to 1.5 rpm to 0.5 to 0.8 rpm. By reducing the cutterhead rotational speed, the force with which the cutterhead cuts the soil during excavation is reduced, thereby reducing the impact and stress transmitted to the surrounding soil. This control measure ensures more precise and smooth excavation when the cutterhead is working in different soil layers, avoiding soil damage or instability caused by excessive cutterhead rotational speed.

[0059] In an embodiment of the present invention, after the shield machine enters the reinforcement body, before the step of gradually reducing the soil bin pressure of the shield machine, the shield receiving section excavation control method further includes:

[0060] Step T10: grouting the soil around the tunnel portal to form the reinforcement body.

[0061] Specifically, in step T10, the grouting process can be performed just before the shield machine enters the reinforcement body to ensure effective support and stability of the surrounding soil. Specifically, by injecting grout into the soil around the tunnel portal, the grout solidifies within the soil layer to form a reinforcement body, thereby improving the soil's bearing capacity and overall stability. This process effectively reduces accidents caused by loose soil or insufficient bearing capacity, creating a safer construction environment for the subsequent soil bunker pressure reduction step.

[0062] As an optional implementation, grouting can utilize a polymer slurry to ensure a uniform reinforcement layer within the soil, effectively dissipating soil stress. The slurry's viscosity and fluidity can be adjusted to suit different shield machine models and soil conditions. Furthermore, using appropriate grouting methods (such as static or pneumatic grouting) ensures precise control of the grouting process, avoiding potential localized soil damage.

[0063] Please continue reading Figure 1 , and see Figure 3 In an embodiment of the present invention, after the shield machine enters the reinforcement body, the step of gradually reducing the soil bin pressure of the shield machine includes:

[0064] Step S31: After the shield machine enters the reinforcement body, the soil bin pressure of the shield machine is reduced from 2.6 bar to 2.8 bar to 0.6 bar to 0.8 bar.

[0065] Specifically, in step S31, after the shield machine enters the reinforcement body, it gradually reduces the soil bin pressure from 2.6 to 2.8 bar to 0.6 to 0.8 bar. This process is crucial for the safe and reliable operation of the shield machine. By gradually reducing the internal pressure of the soil bin, the stress in the surrounding soil is effectively relieved, allowing the reinforcement body to withstand the applied load. This operation reduces the dynamic impact on the soil and avoids unexpected soil collapse or damage that could be caused by a sudden pressure reduction.

[0066] More specifically, the process of gradually reducing the bunker pressure requires monitoring the response of the surrounding soil to ensure its stability during the process. For example, with each step of pressure reduction, sensors can monitor the displacement and stress changes in the surrounding soil in real time. Adjustments can be made based on this real-time data to ensure that the applied pressure changes remain within a safe range. This step enables the shield machine to effectively control the bunker pressure while ensuring the stability of the surrounding soil.

[0067] Please continue reading Figure 1 , and see Figure 4 In an embodiment of the present invention, when the distance between the cutterhead and the portal is a second preset distance, the step of performing ground-connected wall grinding at a preset grinding speed includes:

[0068] Step S41: When the distance between the cutter head and the tunnel portal is a second preset distance, the ground-connected wall is ground at a preset grinding speed, and the penetration rate of the shield machine is controlled to be A, A≤5mm / r.

[0069] Specifically, in step S41, when the distance between the cutterhead and the portal reaches a second preset distance, the shield machine begins grinding the ground-connected wall at a preset grinding speed, controlling its penetration to A, where A is ≤ 5 mm / r. The key to this process lies in controlling the grinding speed and penetration to achieve precise wall machining. An appropriate grinding speed not only ensures smooth grinding but also reduces impact forces on the wall, making the grinding operation smoother and avoiding significant damage or deformation to the wall caused by excessively high grinding speeds.

[0070] More specifically, by controlling the penetration rate to A ≤ 5mm / r, the ground-connected wall is effectively protected from excessive cutting during the grinding process, maintaining the wall's structural integrity. This control measure is particularly important because it ensures stable operation of the shield machine while in contact with the ground-connected wall, while also reducing the risk of displacement and deformation during construction. This refined control improves construction safety and reliability.

[0071] In an embodiment of the present invention, before the step of grinding the ground-connected wall at a preset grinding speed when the distance between the cutterhead and the tunnel portal is a second preset distance, the shield receiving section excavation control method further includes:

[0072] Step E10: After the shield machine enters the reinforcement body, the penetration rate of the shield machine is controlled to be 5 mm / r to 10 mm / r, and the thrust of the shield machine is controlled to be 1000 kN to 1500 kN.

[0073] Specifically, in step E10, after the shield machine enters the reinforcement, its penetration rate is first controlled to between 5mm / r and 10mm / r. The key to this process is that by adjusting the penetration rate, the shield machine's cutting depth within the reinforcement can be effectively controlled, avoiding excessive cutting depth that could lead to material loss or ground instability. An appropriate penetration rate ensures smooth penetration of the reinforcement material while minimizing disturbance to the surrounding soil, ensuring construction safety and quality.

[0074] To complement this, the thrust of the shield machine must be controlled within a range of 1000kN to 1500kN. This thrust control not only ensures the shield machine can withstand the reaction force of the stratum but also provides sufficient driving force to penetrate the reinforcement. This optimization step ensures smooth movement of the shield machine in the face of increased material or geological resistance, reducing the risk of equipment damage caused by excessive thrust and extending its service life.

[0075] In an embodiment of the present invention, after the ground-connected wall grinding is completed, before the step of continuing to advance the shield machine until the shield machine is completely out of the hole and completely accommodated in the steel sleeve, the shield receiving section excavation control method includes:

[0076] Step P10: Before the shield machine exits the tunnel, perform full-ring secondary grouting on the segments that have exited the 5-ring shield tail of the shield machine using cement slurry and water glass slurry through grouting holes until slurry comes out of the grouting holes, and control the grouting pressure of the full-ring secondary grouting to be 0.3 MPa to 0.5 MPa; wherein the water-cement ratio of the cement slurry is 1:1, and the volume ratio of the cement slurry to the water glass slurry is 1:1.

[0077] Specifically, in step P10, before the shield machine exits the tunnel, a full-ring secondary grouting is performed through the grouting holes on the segments that have emerged from the shield tail. The grouting slurry used includes cement slurry and water glass slurry. Grouting should continue until slurry is discharged from the grouting holes, while maintaining the grouting pressure within the range of 0.3 MPa to 0.5 MPa. This grouting method provides uniform and continuous support for the surrounding segments, reducing the risk of settlement and deformation of the shield tail.

[0078] More specifically, the water-cement ratio of the cement slurry is set at 1:1, providing optimal consistency and adhesion for the slurry's properties. This ensures fluidity while effectively filling the gaps between the segments and the surrounding soil. Setting the volume ratio of the cement slurry to the water glass slurry at 1:1 enhances the slurry's cohesive strength and impermeability. The use of this composite slurry effectively improves the grouting effect and ensures the stability of the shield machine during construction.

[0079] In an embodiment of the present invention, the preset grinding speed is 2 mm / min to 5 mm / min.

[0080] Specifically, the preset grinding speed ranges from 2mm / min to 5mm / min, providing a suitable operating speed for the shield machine when grinding the ground-connected wall. A reasonable grinding speed can effectively balance grinding efficiency and construction safety. Within this speed range, the shield machine can effectively cut the soil layer without causing increased tool wear or wall damage due to excessive speed. This regulation ensures fine grinding of the stratum during construction and reduces safety hazards caused by improper operation.

[0081] In an embodiment of the present invention, the first preset distance is 13m.

[0082] Specifically, the first preset distance is 13 meters, meaning that after the shield machine enters the receiving section, the safe operating distance between the shield machine and the tunnel portal must be maintained at this specific value. This distance setting is intended to prevent the shield machine from getting too close to the tunnel portal, potentially causing structural damage or construction safety hazards. Through clear distance monitoring, unexpected situations caused by poor strata can be effectively reduced, ensuring the smooth progress of various construction activities.

[0083] More specifically, maintaining a 13m distance provides sufficient safety buffer space for the shield machine's advancement and operation, minimizing disturbance to the surrounding ground. This measure effectively avoids the risk of accidents caused by insufficiently smooth ground or unexpected changes in the ground during construction, thereby protecting the safety of construction personnel and equipment.

[0084] In an embodiment of the present invention, the second preset distance is 1.5 m.

[0085] Specifically, the second preset distance of 1.5m represents the minimum safe distance between the cutterhead and the tunnel portal during the shield machine's grinding operation. Setting this distance is crucial because, during shield construction, an appropriate safety distance effectively prevents structural damage caused by impact or concentrated pressure, thereby maintaining the stability of the surrounding soil. Maintaining a distance of 1.5m between the cutterhead and the tunnel portal ensures optimal operating conditions for the shield machine and effectively reduces potential risks during construction.

[0086] More specifically, when the distance between the cutterhead and the tunnel portal reaches 1.5m, the shield machine enters a preset grinding mode. During this process, strict monitoring and adjustment of the cutterhead's dynamic state ensure that this safe distance is maintained, facilitating effective grinding operations in varying geological conditions. This parameter setting not only improves construction accuracy but also minimizes disturbance to the surrounding soil, thereby ensuring construction safety.

[0087] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A shield receiving section excavation control method, characterized in that: The shield receiving section excavation control method includes: After the shield machine enters the receiving section, the propulsion speed and the cutter head rotation speed are reduced; The shield machine continues to excavate, and when the distance between the shield machine and the tunnel portal reaches a first preset distance, the excavation of the transition section is terminated and the entry operation is started; After the shield machine enters the reinforcement body, gradually reducing the soil bin pressure of the shield machine; When the distance between the cutter head and the tunnel door is a second preset distance, grinding the ground-connected wall at a preset grinding speed; After the ground-connected wall is ground, the shield machine is continuously advanced until the shield machine is completely out of the hole and completely accommodated in the steel sleeve.

2. The shield receiving section excavation control method according to claim 1, characterized in that: After the shield machine enters the receiving section, the step of reducing the propulsion speed and the cutterhead speed includes: After the shield machine enters the receiving section, the propulsion speed of the shield machine is reduced from 50 mm / min to 70 mm / min to 30 mm / min to 20 mm / min; The rotation speed of the cutter disc is reduced from 1.0 rpm to 1.5 rpm to 0.5 rpm to 0.8 rpm.

3. The shield receiving section excavation control method according to claim 1, characterized in that: After the shield machine enters the reinforcement body, before the step of gradually reducing the soil bin pressure of the shield machine, the shield receiving section excavation control method further includes: The reinforcement body is formed by grouting in the soil around the tunnel portal.

4. The shield receiving section excavation control method according to claim 1, characterized in that: After the shield machine enters the reinforcement body, the step of gradually reducing the soil bin pressure of the shield machine includes: After the shield machine enters the reinforcement body, the soil bin pressure of the shield machine is reduced from 2.6 bar to 2.8 bar to 0.6 bar to 0.8 bar.

5. The shield receiving section excavation control method according to claim 1, characterized in that: When the distance between the cutter head and the tunnel door is a second preset distance, the step of performing ground-connected wall grinding at a preset grinding speed includes: When the distance between the cutter head and the tunnel portal is a second preset distance, the ground-connected wall is ground at a preset grinding speed, and the penetration of the shield machine is controlled to be A, A≤5mm / r.

6. The shield receiving section excavation control method according to claim 1, characterized in that: Before the step of grinding the ground-connected wall at a preset grinding speed when the distance between the cutterhead and the tunnel portal is a second preset distance, the shield receiving section excavation control method further includes: After the shield machine enters the reinforcement body, the penetration rate of the shield machine is controlled to be 5mm / r to 10mm / r, and the thrust of the shield machine is controlled to be 1000kN to 1500kN.

7. The shield receiving section excavation control method according to any one of claims 1 to 6, characterized in that: After the ground-connected wall grinding is completed, before the step of continuing to advance the shield machine until the shield machine is completely out of the hole and completely accommodated in the steel sleeve, the shield receiving section excavation control method includes: Before the shield machine exits the tunnel, the segments that have exited the 5-ring shield tail of the shield machine are subjected to full-ring secondary grouting through grouting holes using cement slurry and water glass slurry until slurry comes out of the grouting holes, and the grouting pressure of the full-ring secondary grouting is controlled to be 0.3 MPa to 0.5 MPa; wherein the water-cement ratio of the cement slurry is 1:1, and the volume ratio of the cement slurry to the water glass slurry is 1:

1.

8. The shield receiving section excavation control method according to any one of claims 1 to 6, characterized in that: The preset grinding speed is 2 mm / min to 5 mm / min.

9. The shield receiving section excavation control method according to any one of claims 1 to 6, characterized in that: The first preset distance is 13m.

10. The shield receiving section excavation control method according to any one of claims 1 to 6, characterized in that: The second preset distance is 1.5m.

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