A simulation experiment system and method for shield segment correction in large curvature areas

Abstract

The present invention relates to the field of shield tunnel construction safety, and discloses a simulation experiment system and method for shield segment deviation correction in large curvature sections, including a model system, a measurement system and a data analysis system, wherein: the model system includes a model box, a tunnel model, a segment model and a grid support, the tunnel model and the segment model are respectively placed in the model box, and the grid support is connected to the bottom of the model box; the measurement system includes a three-dimensional laser scanner for measuring the geometric dimensions of the tunnel model and the segment model and the line measurement; the data analysis system includes system supporting software for deviation analysis between the tunnel model and the segment model, a power supply system and a computer for storing analysis data. It is convenient to speculate the number of segments required for the entire turning section, and ensure the construction safety of the shield tunnel in large curvature sections.

Description

Technical Field

[0001] The invention relates to the field of shield tunnel construction safety, and in particular to a simulation experiment system and method for shield segment deviation correction in large curvature sections. Background Art

[0002] Underground rail transit has become the best solution to modern urban traffic congestion due to its advantages of safety, efficiency, comfort, speed, and less land occupation. Underground rail transit tunnels are generally constructed using the shield method, which usually requires a curved tunnel with a small radius of curvature to bypass dense buildings and various obstacles such as pipelines in the city. Shield construction in large curvature areas often leads to problems such as axis deviation, uneven annular surface, and segment extrusion and crushing, which poses a great safety hazard to tunnel construction. This requires the segment posture to be corrected.

[0003] In actual shield construction, it is impossible for the shield to completely fit the design axis, and it is necessary to perform correction design and calculation on the segment ring. Inappropriate correction ring position and segment combination mode selection will not only cause the tunnel construction axis to deviate from the design axis, but also lead to the deviation of the shield posture and cause problems such as segment breakage. To select appropriate correction points and correction ring combination modes for correction, it is necessary to fit the theoretical layout diagram of the segment, formulate corresponding layout methods and correction principles, unify requirements and standards, so as to guide the correction construction of the segment and realize the refined construction of the segment. At present, the theoretical research on the layout design and correction system of the segment ring of the shield tunnel is relatively mature. The selection of the segment and the layout design calculation of the segment ring are completed after considering factors such as line fitting, shield posture, cylinder stroke difference and shield tail gap. However, the correct selection of correction ring points and segment combination modes still needs to invent a process that can be simply operated in the laboratory and can simulate the selection process of the segment correction ring position and correction ring combination mode in actual engineering. Summary of the invention

[0004] The purpose of the present invention is to provide a simulation experiment system and method for shield segment correction in large curvature sections. The purpose of the present invention is to study the shield segment layout design and correction calculation in large curvature sections, and to measure whether the segment layout design obtained by theoretical calculation can meet the construction deviation requirements, and to estimate the number of segments required for the entire turning section, so as to ensure the construction safety of the shield tunnel in large curvature sections.

[0005] The present invention is achieved through the following technical solutions:

[0006] A simulation experiment system for shield segment deviation correction in large curvature sections includes a model system, a measurement system and a data analysis system, wherein:

[0007] The model system includes a model box, a tunnel model, a segment model and a grid support. The tunnel model and the segment model are placed in the model box respectively, and the grid support is connected to the model box.

[0008] The measurement system includes a 3D laser scanner for measuring tunnel models, segment models, and lines;

[0009] The data analysis system includes system supporting software for analyzing the deviation between the tunnel model and the segment model, a power supply system and a computer for storing the analysis data.

[0010] Furthermore, the model box includes a number of rectangular blocks and a folding windshield, each rectangular block is connected through the lower end of the folding windshield, each rectangular block is provided with a through hole, the rectangular blocks at the starting end and the end are respectively provided with baffles, and the remaining rectangular blocks are respectively provided with connecting plates, each connecting plate is connected through the upper end of the folding windshield, the connecting plates at the starting end and the end are respectively connected to the baffles, and through holes are provided on both baffles.

[0011] Furthermore, the segment model includes a segment ring, a standard block, an adjacent block and a capping block. The standard block is located in the lower half of the segment ring, and the adjacent block and the capping block are located in the upper half of the segment ring. The standard block is connected to the adjacent block and the capping block in sequence upward, and the standard block, the adjacent block and the capping block are assembled into a complete circular ring.

[0012] The invention also includes a simulation experiment system for correcting the deviation of shield segments in large curvature sections, which includes the following steps:

[0013] Step 1: Determine the size of the tunnel model, and the model box is provided with a through hole matching the tunnel model;

[0014] Step 2: Install the spliced ​​model box. After the folded windshield is squeezed and deformed, the tunnel model reaches the curvature radius required by the experiment. The curvature radius of the tunnel is generally 300m to 500m, which is called the large curvature section. Fix the model box;

[0015] Step 3: Install and test the 3D laser scanner, scan the geometric dimensions of the tunnel model, and obtain the axis of the tunnel model through software system analysis;

[0016] Step 4: Establish three standard blocks, two adjacent blocks and one capping block model through the software system, so that the standard blocks, adjacent blocks and capping blocks are combined into a segment ring;

[0017] Step 5: Analyze the matching posture of the segment ring and the axis by splicing trial points, calculate the coordinates of the tunnel axis and the segment ring, and obtain the three-dimensional coordinates of the tunnel axis and the segment;

[0018] Step 6: Through the three-dimensional coordinates of the tunnel axis and the segment ring, the segment rings formed by modeling are assembled one by one on the software system to form a segment model. The segment assembly model is actually constructed by taking the modeled segment model as a reference;

[0019] Step 7: Scan the segment assembly model and tunnel model again with a 3D laser scanner, and use the software system to analyze the deviation between the segment assembly axis and the tunnel model axis to determine whether the construction design requirements are met. If a deviation occurs, remove some of the existing incorrect segment ring assemblies and re-assemble them according to the modeled segment model.

[0020] Furthermore, step 6 also includes the following sub-steps:

[0021] Step 6.1: Calculate the three-dimensional coordinates of the tunnel axis and the three-dimensional coordinates of the center of the segment ring in 16 postures;

[0022] Step 6.2: Calculate the three-dimensional coordinates of the tunnel axis and the three-dimensional coordinates of the center of the segment ring in 16 postures using the least squares method, and select the point with the smallest error;

[0023] Step 6.3: Analyze the three-dimensional coordinates and posture of the optimal segment ring.

[0024] Furthermore, step 7 also includes the following steps:

[0025] Step 7.1: Use a 3D laser scanner to determine the positional relationship between the shield and the design axis and set the deviation correction distance;

[0026] Step 7.2: Calculate the correction radius based on the geometric relationship;

[0027] Step 7.3: Use the least squares method to analyze the minimum error range of the segment ring with the best posture.

[0028] Furthermore, the method further comprises the following steps:

[0029] Step 7.3.1: Mark the standard blocks, adjacent blocks and capping blocks on the modeled segment;

[0030] Step 7.3.2: Map the segment model onto the tunnel model by scaling it up;

[0031] Step 7.3.3: Assemble according to the mapped segment model and mark the standard blocks, adjacent blocks and capping blocks that are actually assembled;

[0032] Step 7.3.4: During the assembly process, the segment assembly model is scanned by a 3D laser scanner, and the scanned laser image is synchronized to the modeling of the software system;

[0033] Step 7.3.5: Compare the laser image of the segment assembly model with the segment model being built one by one, and detect the position where the deviation occurs in the marked images of the two models;

[0034] Step 7.3.6: Determine whether the position where the deviation occurs is smaller than the minimum error range of the segment ring.

[0035] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0036] The simulation experiment system and experiment method for the deviation correction of shield segments in large curvature sections of the present invention have a wide range of applications, and can simulate the deviation correction of shield segments at large curvature ends with different turning radii according to experimental requirements, with strong flexibility. Moreover, the experiment is simple to operate, and the layout design of the segments is intuitively expressed. While determining the segment arrangement and combination mode and the rotation installation angle of the capping block, the required number of segment rings in the entire turning section can also be calculated, which has guiding significance for the construction design of actual projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0038] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0039] Figure 2 It is a three-dimensional schematic diagram of the model box block and the folding windshield of the present invention;

[0040] Figure 3 It is a structural schematic diagram of a fixed grid support of the present invention;

[0041] Figure 4 It is a schematic structural diagram of the three-dimensional laser scanner of the present invention;

[0042] Figure 5 This is a diagram of the assembly arrangement of the segment rings of the present invention;

[0043] Figure 6 Schematic diagram of the segment layout model designed for preliminary estimation in the present invention;

[0044] Figure 7 The segment model and simulation device layout diagram of the present invention;

[0045] Figure 8 This is a schematic diagram of the segment layout model after the correction calculation of the present invention;

[0046] Fig. 9 It is a schematic diagram of the process of the present invention;

[0047] Fig.10 It is a schematic diagram of the principle of the present invention.

[0048] Marks and corresponding parts names in the attached drawings:

[0049] 1- rectangular block; 2- folding windshield; 3- grid support; 4- baffle; 7- segment model; 8- tunnel model; 9- segment layout model; 10- circular hole; 11- tripod; 12- filter; 13- capping block; 14- adjacent block; 15- standard block; 18- segment ring. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0051] Example:

[0052] like Figures 1 to 10As shown, the present invention includes a model system, a measurement system and a data analysis system, wherein: the model system includes a model box, a tunnel model 8, a segment model 7 and a grid support 3, the tunnel model 8 and the segment model 7 are respectively placed in the model box, and the grid support 3 is connected to the model box; the measurement system includes a three-dimensional laser scanner 6 for measuring the tunnel model 8, the segment model 7 and the line; the data analysis system includes system supporting software for deviation analysis between the tunnel model 8 and the segment model 7, a power supply system and a computer for storing analysis data, the model box includes a plurality of rectangular blocks 1 and a folding windshield 2, each of the rectangular blocks 1 is connected by the lower end of the folding windshield 2, each rectangular block 1 is provided with a through hole, and the rectangular blocks 1 at the start and the end are respectively provided with The baffle plate 4 and the other rectangular blocks 1 are respectively provided with connecting plates, each connecting plate is connected by the upper end of the folding windshield 2, the connecting plates at the beginning and the end are respectively connected to the baffle plate 4, and the two baffle plates 4 are provided with through holes. The segment model 7 includes a segment ring 18, a standard block 15, an adjacent block 14 and a capping block 13. The standard block 15 is located in the lower half of the segment ring 18, and the adjacent block 14 and the capping block 13 are located in the upper half of the segment ring 18. The standard block 15 is connected to the adjacent block 14 and the capping block 13 upward in sequence. The standard block 15, the adjacent block 14 and the capping block 13 are assembled into a complete circular ring, including the following steps: Step 1: Determine the size of the tunnel model 8, and the model box is provided with a through hole that matches the tunnel model 8; Step 2: Install and splice the model box, After the folding windshield 2 is squeezed and deformed, the tunnel model 8 reaches the curvature radius required by the experiment. The curvature radius of the tunnel is generally 300m to 500m, which is called a large curvature section. The model box is fixed; Step 3: Install the test 3D laser scanner 6, scan the geometric dimensions of the tunnel model 8, and obtain the axis of the tunnel model 8 through software system analysis; Step 4: Use the software system to establish 3 standard blocks 15, 2 adjacent blocks 14 and 1 capping block 13 models respectively, so that the standard blocks 15, adjacent blocks 14 and capping blocks 13 are combined into a segment ring 18; Step 5: Analyze the posture matching the segment ring 18 with the axis by splicing trial points, and calculate the coordinates of the tunnel axis and the segment ring 18 to obtain the three-dimensional coordinates of the tunnel axis and the segment; Step 6: Use the tunnel The three-dimensional coordinates of the tunnel axis and the segment ring 18 are calculated, and the segment rings 18 formed by the modeling are assembled one by one on the software system to form a segment model 7. The segment model 7 after modeling is used as a reference to actually build the segment assembly model; Step 7: Scan the segment assembly model and the tunnel model 8 again by the three-dimensional laser scanner 6, and use the software system to analyze the deviation between the segment assembly axis and the axis of the tunnel model 8 to determine whether the construction design requirements are met. If a deviation occurs, the existing part of the wrong segment ring 18 assembly is dismantled, and the segment ring 18 is reassembled according to the modeled segment model 7. Step 6 also includes the following sub-steps: Step 6.1: Calculate the three-dimensional coordinates of the tunnel axis, and calculate the three-dimensional coordinates of the center of the segment ring 18 in 16 postures; Step 6.2: Calculate the three-dimensional coordinates of the tunnel axis and the three-dimensional coordinates of the center of the segment ring 18 in 16 postures by the least square method, and select the point with the smallest error; Step 6.3: Analyze the three-dimensional coordinates and posture of the best segment ring 18, and step 7 also includes the following steps: Step 7.1: Use the three-dimensional laser scanner 6 to determine the positional relationship between the shield and the design axis, and set the correction distance; Step 7.2: Calculate the correction radius according to the geometric relationship; Step 7.3: Use the least square method to analyze the minimum error range of the segment ring 18 with the best posture, and also include the following steps: Step 7.3.1: Mark the standard block 15, adjacent block 14 and capping block 13 on the modeled segment model 7; Step 7 .3.2: Map the segment model 7 to the top of the tunnel model 8 by scaling up; Step 7.3.3: Assemble according to the mapped segment model 7, and mark the standard blocks 15, adjacent blocks 14 and capping blocks 13 that are actually assembled; Step 7.3.4: During the assembly process, scan the segment assembly model with a three-dimensional laser scanner 6, and synchronize the scanned laser image to the modeling of the software system; Step 7.3.5: Compare the laser image of the segment assembly model with the segment model 7 in the modeling one by one, and detect the position where the deviation occurs in the marked image of the two models; Step 7.3.6: Determine whether the position where the deviation occurs is less than the minimum error range of the segment ring 18. .

[0053] The specific steps of the present invention are:

[0054] Step 1: Determine the size of the tunnel model 8, which is determined according to the actual project. A circular hole 10 with the same diameter is opened at the center of the lower part 5 of each model box block to penetrate the two opposite side walls to form a cylinder to simulate the actual tunnel excavation.

[0055] Step 2: Use the screw mounting frame 17 to tightly splice the model box block 1 and the folding windshield 2 together. After the folding windshield 2 is squeezed and deformed, the tunnel model 8 reaches the curvature radius required by the experiment. The tunnel curvature radius is generally 300m to 500m, which is called a large curvature section. Use a fixed grid support 3 to fix the adjusted model box to the ground.

[0056] Step 3: Install and test a three-dimensional laser scanner, scan the geometric dimensions of the tunnel model 8, and obtain the axis of the tunnel model 8 through software system analysis;

[0057] After the segment selection is completed, the inner diameter of the segment is mainly determined by the train selection, equipment (limits), and the designed travel speed of the train (piston effect); the width and wedge variables of the segment ring 18 are mainly determined by the designed line plane, the radius of the longitudinal section curve, the space design of the shield machine, and the allowable error of the design. After considering the influence of the shield tail, shield articulation, and shield propulsion jack in the actual project, proceed according to the predetermined method and process to meet the predetermined requirements of the design. After scaling down, a certain number of segment rings 18 (including standard rings and turning rings) are prefabricated with plastic materials in preparation for the experiment.

[0058] Step 4: Using the software system, models of three standard blocks 15, two adjacent blocks 14 and one capping block 13 are established respectively, so that the standard block 15, the adjacent block 14 and the capping block 13 are combined into a segment ring 18;

[0059] Step 5: Analyze the matching posture of the segment ring and the axis by splicing trial points, and calculate the coordinates of the tunnel axis and the segment ring to obtain the three-dimensional coordinates of the tunnel axis and the segment; Assume that the outer diameter of the segment ring is D, the segment ring width is L, the segment wedge is M, and the segment assembly ring center o(x 0 ,y 0 ), the center o of the torus to be assembled 1 (x, y), the initial direction angle of the assembly ring is α, and the angle γ between the longer side of the segment ring and the outer diameter is: Segment ring end angle: Plane coordinates of the end point of the segment ring: When assembling the straight line segment, the starting coordinates of the segment ring centerline (x 0 ,y 0 ), calculate the end point coordinates after the assembled segments are joined:

[0060] Step 6, through the three-dimensional coordinates of the tunnel axis and the segment ring, assemble the modeled segment rings one by one on the software system to form a segment model, calculate the three-dimensional coordinates of the tunnel axis, and calculate the three-dimensional coordinates of the center of the segment ring in 16 postures; calculate the three-dimensional coordinates of the tunnel axis and the three-dimensional coordinates of the center of the segment ring in 16 postures using the least squares method, and select the point with the smallest error; analyze the three-dimensional coordinates and posture of the optimal segment ring.

[0061] The segment model after modeling is used as a reference to build the segment assembly model in actual operation; when fitting the layout of the universal segment, there is only one tunnel design axis, and there is only one three-dimensional coordinate point at the corresponding mileage. However, the universal segment corresponds to multiple sets of three-dimensional coordinate values ​​due to different assembly points at the same mileage. The least squares method is used to optimize several sets of segment annular surface center coordinate values, and the best fitting coordinates are selected as the fitting result. Assuming that the three-dimensional coordinates of the tunnel design axis at a certain mileage are (x, y, z), the three-dimensional coordinates of the annular surface center of the universal segment ring to be assembled in 16 postures are calculated through coordinates (x1, y1, z1), (x2, y2, z2)...(x16, y16, z16), and the least squares method is used to find the best fit coordinates among the 16 sets of errors. Select the point with the smallest error;

[0062] Step 7: Different assembly points of the segments result in different deviation directions and sizes. The wedge amount of the general segment is 40mm, and the wedge angle is 22′10.74″. When the segment is assembled at point 1, that is, the capping block is at the top, the deviation value above the segment is -20mm, and the deviation value below is 20mm. When the segment is assembled at 16 different points, let the assembly point be x, the deviation above be hv, and the deviation on the left be hh. The deviation values ​​in each direction can be calculated according to the formula h v = -18.6cos[22.5×(x-1)]° and h h =18.6sin[22.5×(x―1)]°, the excess deviations at the bottom and right are the opposite of those at the top and left respectively.

[0063] The radius of the circle where the 16 trial points are located can be obtained by the formula According to the 16 different segment assembly forms, the position of the segment ring center axis is also different. The axis deviation calculation diagram is drawn as follows Fig.10 As shown in the figure, let the vertical deviation of the axis be gv and the horizontal deviation be gh. Then the axis deviation values ​​at different points can be calculated according to the formula g v =9.7cos[22.5×(x-1)]° and g h =9.7sin[22.5×(x-1)]°, and the calculated values ​​of segment tolerance and axis deviation at different points are obtained according to the calculation formulas for the tolerance at different points and the axis deviation, as shown in Table 1.

[0064]

[0065] Table 1

[0066] Use a 3D laser scanner to determine the positional relationship between the shield and the design axis, and set the deviation correction distance; calculate the deviation correction radius based on the geometric relationship, and use the least squares method to analyze the minimum error range of the segment ring 18 with the best posture. The universal segment itself has a certain wedge shape, which will produce corresponding deviations when the segments are assembled. Different segment assembly points lead to deviations, which cause the central axis of the segment ring 18 to deviate from the original tunnel axis during assembly. On the modeled segment model 7, mark A for the standard block 15, B for the adjacent block 14, and C for the capping block 13. Mark the next segment in sequence by marking A′, B′ for the adjacent block 14, and C′ for the capping block 13. The segment model 7 is scaled up and mapped to the top of the tunnel model 8. Through the mapped segment model 7, according to the mapped segment model The segment model 7 is assembled. In actual operation, when the first segment ring 18 is assembled, the standard block 15, the adjacent block 14 and the capping block 13 of the second segment ring 18 are marked with a, b, and c respectively, and the standard block 15, the adjacent block 14 and the capping block 13 of the third segment ring 18 are marked with a′, b′, and c′ respectively. During the assembly process, assuming that the eighth block is assembled, the three-dimensional laser scanner scans the segment assembly model, and synchronizes the scanned laser image to the modeling of the software system; by matching a, b, c in the segment assembly model with A, B, and C, the minimum error range in the modeling is shaded green through the minimum error range of each segment ring 18. If a, b, and c are not within the green range, an alarm message is generated to warn the staff, so that the segment ring 18 with assembly errors can be corrected in time.

[0067] The segment assembly model and tunnel model 8 are scanned again with a 3D laser scanner, and the deviation between the segment assembly axis and the tunnel model 8 axis is analyzed by a software system to determine whether the construction design requirements are met. If a deviation occurs, the existing partially erroneous segment ring 18 assembly is dismantled and re-assembled with staggered seams according to the modeled segment model 7.

[0068] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A simulation experimental method for shield segment deviation correction in large curvature areas. It is characterized in that Based on the simulation experiment system, the simulation experiment system includes: It includes model system, measurement system and data analysis system, among which: The model system comprises a model box, a tunnel model (8), a segment model (7) and a grid support (3); the tunnel model (8) and the segment model (7) are respectively placed in the model box, and the grid support (3) is connected to the model box; The measurement system includes a three-dimensional laser scanner (6) for measuring a tunnel model (8), a segment model (7), and a line; The data analysis system includes system supporting software for analyzing the deviation between the tunnel model (8) and the segment model (7), a power supply system, and a computer for storing analysis data; The model box comprises a plurality of rectangular blocks (1) and a folding windshield (2), each rectangular block (1) is connected via the lower end of the folding windshield (2), each rectangular block (1) is provided with a through hole, the rectangular blocks (1) at the start and the end are provided with baffles (4), the remaining rectangular blocks (1) are provided with connecting plates, each connecting plate is connected via the upper end of the folding windshield (2), the connecting plates at the start and the end are connected to the baffles (4), and both baffles (4) are provided with through holes; The simulation experiment method includes the following steps: Step 1: Determine the size of the tunnel model (8), and provide a through hole on the model box that matches the tunnel model (8); Step 2: Install the spliced ​​model box. After the folded windshield (2) is squeezed and deformed, the tunnel model (8) reaches the curvature radius required by the experiment. The tunnel curvature radius is 300m~500m, which is called the large curvature section. Fix the model box; Step 3: Install and test a three-dimensional laser scanner (6), scan the geometric dimensions of the tunnel model (8), and obtain the axis of the tunnel model (8) through software system analysis; Step 4: Using a software system, models of three standard blocks (15), two adjacent blocks (14) and one capping block (13) are established respectively, so that the standard block (15), the adjacent block (14) and the capping block (13) are combined into a segment ring (18); Step 5: Analyze the matching posture of the segment ring (18) and the axis by splicing trial points, and calculate the coordinates of the tunnel axis and the segment ring (18), so as to obtain the three-dimensional coordinates of the tunnel axis and the segment; Step 6: Using the three-dimensional coordinates of the tunnel axis and the segment ring (18), the segment rings (18) formed by modeling are assembled one by one on the software system to form a segment model (7). The segment assembly model is constructed by actual operation using the modeled segment model (7) as a reference; Step 7: The segment assembly model and the tunnel model (8) are scanned again by the three-dimensional laser scanner (6), and the deviation between the segment assembly axis and the tunnel model (8) axis is analyzed by the software system to determine whether the construction design requirements are met. If a deviation occurs, the existing incorrect segment ring (18) is dismantled and reassembled according to the modeled segment model (7).

2. A simulation experimental method for correcting the deviation of shield segments in large curvature sections according to claim 1, It is characterized in that The segment model (7) comprises a segment ring (18), a standard block (15), an adjacent block (14) and a capping block (13), wherein the standard block (15) is located at the lower half of the segment ring (18), the adjacent block (14) and the capping block (13) are located at the upper half of the segment ring (18), the standard block (15) is connected to the adjacent block (14) and the capping block (13) in sequence upwards, and the standard block (15), the adjacent block (14) and the capping block (13) are assembled into a complete circular ring.

3. A simulation experimental method for correcting the deviation of shield segments in large curvature sections according to claim 1, It is characterized in that Step 6 also includes the following sub-steps: Step 6.1: Calculate the three-dimensional coordinates of the tunnel axis and the three-dimensional coordinates of the center of the segment ring (18) in 16 postures; Step 6.2: Calculate the three-dimensional coordinates of the tunnel axis and the three-dimensional coordinates of the center of the segment ring (18) in 16 postures using the least square method, and select the point with the smallest error; Step 6.3: Analyze the three-dimensional coordinates and posture of the optimal segment ring (18).

4. A simulation experimental method for correcting the deviation of shield segments in large curvature sections according to claim 1 or 3, It is characterized in that Step 7 also includes the following steps: Step 7.1: Use a three-dimensional laser scanner (6) to determine the positional relationship between the shield and the design axis and set the deviation correction distance; Step 7.2: Calculate the correction radius based on the geometric relationship; Step 7.3: Use the least square method to analyze the minimum error range of the segment ring (18) with the best posture.

5. A simulation experimental method for correcting the deviation of shield segments in large curvature sections according to claim 4, It is characterized in that The following steps are also included: Step 7.3.1: Mark the standard block (15), adjacent block (14) and capping block (13) on the modeled segment model (7); Step 7.3.2: Map the segment model (7) onto the tunnel model (8) by scaling up; Step 7.3.3: Assemble according to the mapped segment model (7), and mark the standard blocks (15), adjacent blocks (14) and capping blocks (13) that are actually assembled; Step 7.3.4: During the assembly process, the segment assembly model is scanned by a three-dimensional laser scanner (6), and the scanned laser image is synchronized with the modeling of the software system; Step 7.3.5: Compare the laser image of the segment assembly model with the segment model (7) under construction one by one, and detect the position where the deviation occurs in the marked images of the two models; Step 7.3.6: Determine whether the position where the deviation occurs is smaller than the minimum error range of the segment ring (18).

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