Shield tunnel axis position control and deviation correction method in boulder and bedrock protruding stratum

Abstract

The invention provides a shield tunnel axis position control and deviation correction method in a boulder and bedrock protruding stratum, and belongs to the field of tunnel shield construction.The method comprises the steps that firstly, a three-dimensional model of shield tunnel tunneling is generated through Autodesk Revit software; then, in the tunneling process, whether tunneling parameters are the same as parameters of the corresponding process in the three-dimensional model or not at the end of the same time of each period is compared, and if not, deviation correction work is carried out until deviation correction succeeds at the end of the next time period; according to the method, a method for generating a deviation correction value through the axis of the shield tunnel at the end of a corresponding time period and the deflection distance and angle of the axis of the shield tunnel in a three-dimensional model is provided, and deviation correction work is carried out in the next time period according to the deviation correction value; according to the method, the deviation rectification work can be continuously carried out until the shield tunnel is rectified to the correct position; even if the deviation rectification is not successful temporarily, the shield tunneling machine continuously approaches to the correct shield tunnel axis in the continuous deviation rectification process.

Description

Technical Field

[0001] The invention belongs to the field of tunnel shield construction, and in particular relates to a method for controlling and correcting the position of a shield tunnel axis in a boulder or bedrock protrusion stratum. Background Art

[0002] Shield tunnel construction in boulder and bedrock protrusion strata faces a series of special technical challenges. First, boulders usually refer to isolated rock blocks formed underground, which may be surrounded by soft soil or loose sediments. Under such geological conditions, the shield machine may encounter soils of different hardness and density during the advancement process, which makes the cutting and advancement of the cutterhead more complicated.

[0003] In bedrock protrusion strata, the construction of shield tunnels needs to pass through relatively hard rock layers, which not only increases the requirements for shield machines, but also may cause the deflection of the tunnel axis; the lithology, structure and degree of fracture development of the bedrock will directly affect the advancement path of the shield machine; if there are large unevenness or faults in the bedrock protrusion, the shield machine may encounter sudden geological changes when passing through, causing the advancement direction of the shield machine to shift; therefore, corresponding correction work is required to make the shield machine return to the accurate shield tunnel axis to ensure the smooth and accurate construction of the shield tunnel project. Summary of the invention

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art and to greatly improve its technical effect on the basis of the original technology; for this purpose, the present invention provides a method for controlling and correcting the axis position of a shield tunnel in a boulder and bedrock protrusion stratum, the method comprising:

[0005] Before the construction of the project, according to the geological survey results and the project overview, a three-dimensional model of the shield tunnel is generated based on the relationship between the shield tunnel axis and the excavation parameters; the axis position of the shield tunnel determines the progress and excavation parameters of the shield machine; the excavation parameters include: excavation speed, thrust, tool speed, excavation thickness and inclination angle of the shield machine, etc.; according to the relationship between the shield tunnel axis and the excavation parameters, the Autodesk Revit software is used to generate a three-dimensional model of the shield tunnel excavation.

[0006] During the excavation process, according to the excavation progress, the excavation parameters of the shield machine are extracted at regular intervals, and the extracted excavation parameters of the shield machine are compared with the parameters in the three-dimensional image of the corresponding process; if the parameters are equal, the parameters of the next time period are extracted and compared; if the parameters are different, according to the deflection angle and distance, the parameters (x1+μ1, x2+μ2, ..., x i +μ i , …x n +μ n) In the next time period, the excavation axis position is corrected, where x i is the value of each excavation parameter in the 3D model in the next time period, μ i is the correction value of the corresponding parameter, n represents a total of n excavation parameters; the said period of time includes: determining the progress of the shield tunnel according to the position of the shield tunnel axis, and extracting the shield machine excavation parameters once at the same time interval according to the progress of the shield tunnel; that is, at the end of each time period, it corresponds to a process of the shield tunnel.

[0007] Determine the correction value of each parameter in the next time period according to the deflection angle and distance; determine the correction value (μ1, μ2, …, μ 2, μ 3, μ 4, μ 5, μ 6, μ 7, μ 8, μ 9, μ 10, μ 11, μ 12, μ 13, μ 14, μ 15, μ 16, μ 17, μ 18, μ 19, μ 20, μ 21, μ 22, μ 23, μ 24, μ 25, μ 26, μ 27, μ 28, μ 29, μ 30, μ 31, μ 32, μ 33, μ 34, μ 35, μ 36, μ 37, μ 38, μ 39, μ 40, μ 41, μ 42, μ 43, μ 44, μ 45, μ 46, μ i , …μ n ), where μ i is the correction value of the corresponding parameter, and n means there are n excavation parameters in total.

[0008] After the correction of the next time period is completed, it is determined whether the axis position of the shield tunnel is consistent with the axis position in the three-dimensional model. If they are consistent, it proves that the correction is completed; if they are inconsistent, continue to use the same method to correct the deviation until the correction is successful; if they are consistent, it proves that the shield machine has successfully corrected the deviation by adjusting the parameters of the next time period at the end of the shield machine excavation in the next time period; at this time, there is no need to correct the deviation, and continue to excavate according to the parameters at the end of the shield tunnel three-dimensional model; if after the correction of the next time period is completed, it is determined that the axis position of the shield tunnel is inconsistent with the axis position in the three-dimensional model, it proves that the correction is not successful; then continue to compare the deflection angle and distance of the shield tunnel relative to the axis position of the shield tunnel at the same time in the three-dimensional model at the end of the corresponding time period, regenerate the correction value, and perform (x1+μ1, x2+μ2,…, x i +μ i , …x n +μ n ) and perform correction work in another upcoming time period; if the correction is still unsuccessful, continue to perform correction work in the same way until it is successful.

[0009] The beneficial effects of the present invention are:

[0010] The present invention provides a method for controlling and correcting the axis position of a shield tunnel in a solitary rock or bedrock protruding stratum. a. The method determines the axis position related to the construction process by designing a three-dimensional model of the tunnel axis, so that the constructor can determine whether the axis position of the shield tunnel is deflected according to the construction process; b. The method provides a method for generating a correction value by using the deflection distance and angle of the shield tunnel axis and the shield tunnel axis in the three-dimensional model at the end of the corresponding time period, and performs correction work according to the correction value in the next time period; c. The method can continuously perform correction work until the shield tunnel is corrected to the correct position; even if the correction is temporarily unsuccessful, the shield machine is constantly approaching the correct shield tunnel axis during the continuous correction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The present invention is a flow chart of the shield tunnel axis position control and deviation correction method in isolated boulders and bedrock protrusion strata. DETAILED DESCRIPTION

[0012] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings; it should be understood that the specific embodiments given here are only used to illustrate and explain the present invention and cannot be used to limit the present invention.

[0013] like Figure 1 As shown in FIG. 1 , it is a flow chart of the method for controlling and correcting the axis position of a shield tunnel in a solitary rock and bedrock protrusion stratum of the present invention, and the flow chart comprises: step S100, before the construction of the project, according to the geological exploration results and the project overview, a three-dimensional model of the shield tunnel is generated based on the relationship between the axis of the shield tunnel and the excavation parameters; step S200, during the excavation process, according to the excavation process, the excavation parameters of the shield machine are extracted at regular intervals, and the extracted excavation parameters of the shield machine are compared with the parameters in the three-dimensional image of the corresponding process; if the parameters are equal, the parameters of the next time period are extracted and compared; if the parameters are different, according to the angle and distance of the deflection, the parameters (x1+μ1, x2+μ2, …, x i +μ i , …x n +μ n ) In the next time period, the excavation axis position is corrected, where x i is the value of each excavation parameter in the 3D model in the next time period, μ i is the correction value of the corresponding parameter, and n represents a total of n excavation parameters; step S300, after the correction in the next time period is completed, determine whether the axis position of the shield tunnel is consistent with the axis position in the three-dimensional model. If they are consistent, it proves that the correction is completed; if not, continue to use the step S200 method to correct the deviation until the correction is successful.

[0014] In step S100, the axial position of the shield tunnel determines the progress and excavation parameters of the shield machine; the excavation parameters include: excavation speed, thrust, tool speed, excavation thickness and inclination angle of the shield machine, etc.; according to the relationship between the shield tunnel axis and the excavation parameters, the Autodesk Revit software is used to generate a three-dimensional model of the shield tunnel excavation.

[0015] Specifically, the position of the shield tunnel axis in the generated three-dimensional model determines the progress of the shield machine's excavation, and the excavation parameters determine the time required from the previous excavation process to the next excavation process; therefore, the generated three-dimensional model not only includes the shield tunnel axis position and excavation parameters, but also includes the time corresponding to the shield tunnel axis position.

[0016] In step S200, the progress of the shield tunnel is determined according to the position of the shield tunnel axis, and the parameters of the shield machine excavation are extracted at equal intervals according to the progress of the shield tunnel; that is, at the end of each time period, it corresponds to a progress of the shield tunnel.

[0017] Specifically, the tunneling parameters of the shield machine are extracted every 20 minutes. At the same time, according to the tunneling parameters set in the 3D model, the tunneling depth from one process to the next can be determined every 20 minutes.

[0018] Subsequently, various parameters of the shield machine at the end of the 20 minutes are extracted, and the angle and distance of the shield machine transmission are determined by the actual axis position of the shield machine in the parameters and the axis position of the corresponding process in the three-dimensional model; then the correction value of each parameter in the next time period is determined by the deflection angle and distance; according to the angle and distance of the shield tunnel axis deflection at the end of the corresponding time period, with the purpose of returning the shield tunnel to the shield tunnel position in the three-dimensional model at the end of the corresponding time period, the correction value (μ1, μ2, …, μ i , …μ n ), where μ i is the correction value of the corresponding parameter, and n means there are n excavation parameters in total.

[0019] Specifically, if μ i It represents the excavation speed. It is known that the angle and distance of the actual axis position of the shield machine relative to the axis position of the corresponding process in the three-dimensional model are θ and S respectively. Then, in the next time period, that is, in the next 20 minutes, the correction value of the shield machine speed is 3S, the unit is m / hour, and the direction is the opposite direction of θ.

[0020] Preferably, the correction values ​​(μ1, μ2, ..., μ i , …μ n ) into the next time period parameters (x1, x2, ..., x i , …xn ) constitute the parameters of the shield machine after correction in the next time period (x1+μ1, x2+μ2,…, x i +μ i , …x n +μ n ); where parameter x i The value of does not need to be the same all the time and can be adjusted according to different soil types and structural conditions. By integrating each parameter in each time period, the excavation depth and angle of the shield tunnel in the corresponding time period can be determined.

[0021] In step S300, if they are consistent, it proves that the shield machine has successfully corrected the deviation by adjusting the parameters of the next time period when the shield machine excavation ends in the next time period; at this time, there is no need to correct the deviation, and the excavation work continues according to the parameters at the end of the shield tunnel three-dimensional model.

[0022] If after the correction of the next time period, it is determined that the axis position of the shield tunnel is inconsistent with the axis position in the three-dimensional model, it is proved that the correction is not successful; then the correction work is performed in the manner of step S200; specifically, the deflection angle and distance of the shield tunnel relative to the axis position of the shield tunnel at the same time in the three-dimensional model at the end of the corresponding time period are continuously compared, the correction value is regenerated, and the parameters of another upcoming time period are (x1+μ1, x2+μ2, …, x i +μ i , …x n +μ n ) is adjusted, and correction work is performed in another upcoming time period; if the correction is still unsuccessful, the correction work is continuously performed in the manner of step S200 until the correction is successful.

Claims

1. A method for controlling and correcting the axis position of a shield tunnel in isolated boulders and bedrock protrusions, characterized in that: The method comprises the following steps: S100, before the construction of the project, based on the geological survey results and the project overview, a three-dimensional model of the shield tunnel is generated based on the relationship between the shield tunnel axis and the excavation parameters; S200, during the excavation process, according to the excavation progress, the excavation parameters of the shield machine are extracted at regular intervals, and the extracted excavation parameters of the shield machine are compared with the parameters in the three-dimensional image of the corresponding process; if the parameters are equal, the parameters of the next time period are extracted and compared; if the parameters are different, according to the deflection angle and distance, the parameters (x1+μ1, x2+μ2, ..., x i +μ i , …x n +μ n ) In the next time period, the excavation axis position is corrected, where x i is the value of each excavation parameter in the 3D model in the next time period, μ i is the correction value of the corresponding parameter, n means there are n excavation parameters in total; S300. After the correction is completed in the next time period, determine whether the axis position of the shield tunnel is consistent with the axis position in the three-dimensional model. If they are consistent, it proves that the correction is completed; if not, continue to correct the deviation in the same way as step S200 until the correction is successful.

2. The method for controlling and correcting the axis position of a shield tunnel in a solitary boulder or bedrock protrusion stratum according to claim 1, characterized in that: The relationship between the shield tunnel axis and the excavation parameters in step S100 includes: the axis position of the shield tunnel determines the excavation progress and excavation parameters of the shield machine; the excavation parameters include: excavation speed, thrust, tool speed, excavation thickness and inclination angle of the shield machine; according to the relationship between the shield tunnel axis and the excavation parameters, the three-dimensional model of the shield tunnel excavation is generated using Autodesk Revit software.

3. The method for controlling and correcting the axis position of a shield tunnel in a solitary boulder or bedrock protrusion stratum according to claim 1, characterized in that: The periodic intervals described in step S200 include: determining the progress of the shield tunnel according to the position of the shield tunnel axis, and extracting the shield machine excavation parameters at the same time intervals according to the progress of the shield tunnel; that is, at the end of each time period, it corresponds to a progress of the shield tunnel.

4. The method for controlling and correcting the axis position of a shield tunnel in a solitary boulder or bedrock protrusion stratum according to claim 1, characterized in that: The method according to the deflection angle and distance in step S200 includes: determining the correction value of each parameter in the next time period according to the deflection angle and distance; determining the correction value (μ1, μ2, ..., μ 2, μ 3, μ 4, μ 5, μ 6, μ 7, μ 8, μ 9, μ 10, μ 11, μ 12, μ 13, μ 14, μ 15, μ 16, μ 17, μ 18, μ 19, μ 20, μ 21, μ 22, μ 23, μ 24, μ 25, μ 26, μ 27, μ 28, μ 29, μ 30, μ 31, μ 32, μ 33, μ 34, μ 35, μ 36, μ 37, μ 38, μ 39, μ 40, μ 41, μ 42, μ 43 i , …μ n ), where μ i is the correction value of the corresponding parameter, and n means there are n excavation parameters in total.

5. The method for controlling and correcting the axis position of a shield tunnel in a solitary boulder or bedrock protrusion stratum according to claim 1, characterized in that: If they are consistent, it proves that the correction is completed in step S300, including: if they are consistent, it proves that the shield machine has successfully corrected the deviation by adjusting the parameters of the next time period when the shield machine excavation ends in the next time period; at this time, there is no need to correct the deviation, and the excavation work continues according to the parameters at the end of the shield tunnel three-dimensional model.

6. The method for controlling and correcting the axis position of a shield tunnel in a solitary boulder or bedrock protrusion stratum according to claim 1, characterized in that: The process of continuing to correct the deviation in the same manner until the correction is successful in step S300 includes: if after the correction in the next time period is completed, it is determined that the axis position of the shield tunnel is inconsistent with the axis position in the three-dimensional model, it is proved that the correction is not successful; then the angle and distance of the deflection of the shield tunnel relative to the axis position of the shield tunnel of the same process in the three-dimensional model at the end of the corresponding time period are continuously compared, the correction value is regenerated, and the parameters of another upcoming time period are (x1+μ1, x2+μ2, ..., x i +μ i , …x n +μ n ) is adjusted, and the deviation correction work is performed in another upcoming time period; if the deviation correction is still unsuccessful, the deviation correction work is continuously performed in the same manner as step S200 until the deviation correction is successful.

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