Method for analyzing stability of control points in tunnel

Abstract

The invention relates to a stability analysis method for control points in a tunnel in the technical field of tunnel measurement, which comprises the following steps of: S1, establishing a wire control network and a leveling network in the tunnel, and remeasuring the control points; s2, selecting a traverse point as an analysis point, comparing the two groups of horizontal angle data obtained after retest, and judging whether the two groups of horizontal angle data meet the standard or not; s3, establishing a deviation limiting system of two adjacent control points, wherein the deviation limiting system comprises a side length deviation standard, an elevation deviation standard and a difference relative precision standard of coordinate differences; s4, taking two control points adjacent to the analysis point as two target points, comparing the deviation limiting systems of the three control points pairwise, and integrating the judgment condition that the horizontal angle is relatively poor to obtain the stability condition of the analysis point; according to the method, comprehensive analysis can be carried out from multiple aspects, and the accuracy of stability judgment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel measurement, and in particular to a stability analysis method for a control point in a tunnel. Background Art

[0002] As is known, in the process of tunnel construction, the guide points are also called control points or reference points, etc., and the control network and the leveling network are two important measurement systems, which are used to ensure that the construction and design of the tunnel meet the predetermined specifications and requirements; the leveling network is a measurement network used to control the tunnel elevation, and the control network is a geometric measurement network constructed by a series of measurement reference points, which is mainly used to determine the horizontal position and direction of the tunnel. If the control points are unstable, it may cause measurement errors, which in turn affect the direction of tunnel excavation, causing the tunnel trajectory to deviate from the predetermined design, thereby affecting the entire construction process; therefore, only when the control points in the tunnel remain stable can the measurement work be more efficient and accurate, thereby reducing the number of repeated verifications and corrections, and ensuring that the construction progress is not affected; For example, the Chinese invention patent with the announcement number CN111693021B discloses a verification method for guide points in a tunnel, which mainly uses the adjustment calculation method to determine whether the coordinates of the guide points meet the requirements, the judgment form is relatively single, the correction of measurement errors is limited, it is difficult to handle large-scale errors, and it is not possible to timely discover deviations in the construction process. Summary of the invention

[0003] In order to overcome the deficiencies in the background technology and solve the existing technical problems, the present invention discloses a stability analysis method for control points in a tunnel, which can comprehensively analyze from multiple aspects and improve the accuracy of stability judgment.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A stability analysis method for control points in a tunnel comprises the following steps: S1, establishing a wire control network and a leveling network in the tunnel, and re-measurement of the control points, so as to obtain two sets of side length data and two sets of elevation data between any two adjacent control points, two sets of three-dimensional coordinate data of any control point, and two sets of horizontal angle data with any control point as a corner point; S2, selecting a control point as an analysis point, taking the two control points adjacent to the analysis point as a foresight point and a backsight point respectively, performing a comparison on the two sets of horizontal angle data obtained after the re-measurement, obtaining a horizontal angle difference, and judging whether the horizontal angle difference meets a standard; S3, establishing a deviation limitation system for two adjacent control points, including a side length difference standard. , elevation difference standard and relative accuracy standard of coordinate difference; the side length difference standard is to compare the two sets of side length data obtained after re-measurement between the two control points to get the side length difference, judge whether the side length difference meets the specified standard, and take the average value of the two sets of side length data as the side length S of the two target points; the elevation difference standard is to compare the two sets of elevation data obtained after re-measurement between the two control points to get the elevation difference, judge whether the elevation difference meets the specified standard; the relative accuracy standard of coordinate difference is that after re-measurement of the three-dimensional coordinates of the two control points, the three-dimensional coordinate increments △X, △Y, △Z of each control point can be obtained, and the relative accuracy of the coordinate difference of the two control points is calculated: , where △X ij, △Y ij, is the difference in the two-dimensional coordinate increment between adjacent target points i and j, △Z ij is the difference in Z-direction coordinate increments between adjacent target points i and j; determine whether the relative accuracy of the coordinate difference meets the standard; S4, taking the two control points adjacent to the analysis point as the two target points, compare the deviation limitation systems of the three control points pairwise, and comprehensively consider the judgment of the poor horizontal angle to obtain the stability of the analysis point.

[0006] Further, in S4, if the analysis point exceeds the limit with both target points but meets the limit between the two target points, the analysis point is an unstable point; if the analysis point meets the limit with one target point but exceeds the limit with the other target point, the analysis point is a point to be observed; if the analysis point meets the limit with both target points, the analysis point is a stable point.

[0007] Furthermore, the conductor control network in the tunnel has two rows of control points.

[0008] Furthermore, the side length S is 200 to 500 m.

[0009] Furthermore, the horizontal angle error standard is no more than 3″; the side length error standard is no more than 2mD=2(a+bD), unit mm, where a is the fixed error in the nominal accuracy of the total station distance measurement, unit mm, b is the proportional coefficient in the nominal accuracy of the total station distance measurement, unit mm / km, and D is the distance measurement length, unit km; the elevation error standard is , unit: mm; the relative accuracy standard of coordinate difference is no more than 1 / 50000.

[0010] Furthermore, the re-survey equipment includes a total station, a prism and a level.

[0011] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0012] The stability analysis method of the control points in the tunnel disclosed by the present invention comprehensively judges the stability of the control points by re-surveying the control network and the leveling network in the tunnel, using the relative accuracy of the difference between the horizontal angle, the side length, the elevation and the coordinate difference, as well as the deviation relationship between the adjacent control points, so that the analysis is more comprehensive and the judgment is more accurate. In particular, the judgment method of the relative accuracy of the difference between the coordinates has significantly improved correction ability compared with the traditional adjustment calculation method. More importantly, it can accurately reflect the individual changes of each control point, which is convenient for timely adoption of targeted measures for correction processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the wire control network in the tunnel. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0015] Combined with Figure 1 The stability analysis method of the control point in the tunnel comprises the following steps:

[0016] Step 1: Establish the wire control network and leveling network in the tunnel, and re-measure the control points to obtain two sets of side length data and two sets of elevation data between any two adjacent control points, two sets of three-dimensional coordinate data of any control point, and two sets of horizontal angle data with any control point as the corner point; according to the needs, the wire control network in the tunnel has two rows of control points, as shown in the attached figure. Figure 1 As shown, symmetrical measurement can be performed. When re-measurement is performed, a total station and a prism are generally used, and a level is used to assist in height measurement.

[0017] Step 2: Select a control point as the analysis point, and take the two control points adjacent to the analysis point as the foresight point and the backsight point respectively. Compare the two sets of horizontal angle data obtained after re-measurement to get the horizontal angle difference, and judge whether the horizontal angle difference meets the standard; as shown in the attached figure, Figure 1 As shown, assuming that the analysis point is point B, the foresight point and the backsight point are points A and C respectively, the horizontal angle difference is the difference between the two ∠ABC, and the horizontal angle difference standard is no more than 3″. If it reaches this standard, it is qualified, otherwise it is unqualified.

[0018] Step 3: Establish a deviation limitation system between two adjacent control points, including the standard for side length difference, the standard for elevation difference and the relative accuracy standard for the difference between coordinates;

[0019] The side length difference standard is to compare the two sets of side length data obtained after re-measurement between the two control points to obtain the side length difference. The side length difference standard is not more than 2mD=2(a+bD), unit mm, where a is the fixed error in the nominal accuracy of the total station distance measurement, unit mm, b is the proportional coefficient in the nominal accuracy of the total station distance measurement, unit mm / km, and D is the distance measurement length, unit km; judge whether the side length difference meets the specified standard, and take the average value of the two sets of side length data as the side length S of the two target points, and the side length S is generally 200-500m;

[0020] The elevation difference standard is to compare the two sets of elevation data obtained after re-measurement between two control points to obtain the elevation difference. The elevation difference standard is , unit is mm, that is, when D is 1km, the value D is taken as 1 to judge whether the elevation difference meets the specified standard;

[0021] The relative accuracy standard of the difference between coordinates is that after re-measuring the three-dimensional coordinates of the two control points, the three-dimensional coordinate increments △X, △Y, △Z of each control point can be obtained, and the relative accuracy of the difference between the coordinates of the two control points is calculated:

[0022]

[0023] Among them, △X ij, △Y ij, is the difference in the two-dimensional coordinate increment between adjacent control points i and j, in meters, △Z ij It is the difference in Z-direction coordinate increments between adjacent target points i and j, in meters; it is used to determine whether the relative accuracy of the coordinate difference meets the standard, and the relative accuracy standard of the coordinate difference is no more than 1 / 50000.

[0024] Step 4: Take the two control points adjacent to the analysis point as the two target points, compare the deviation limit systems of the three control points in pairs, and comprehensively judge the horizontal angle difference to obtain the stability of the analysis point. That is, even if the horizontal angle difference of the analysis point meets the standard, it is necessary to continue to analyze and judge the deviation limit system. For the three points ABC, it is necessary to conduct pairwise comparison analysis on each of the three standards: the side length difference standard, the elevation difference standard, and the relative accuracy standard of the coordinate difference. If the analysis point B exceeds the limit with the two target points A and C respectively, that is, it does not meet the standard, while the two target points AC meet the limit, that is, they meet the standard, it proves that If only point B moves, then analysis point B is an unstable point under this standard; if analysis point B is within the limit with one target point A and exceeds the limit with another target point C, then the analysis point is a point to be observed and needs to be judged based on the situation between the two target points AC, and then point C is used as the analysis point for specific analysis; if analysis point B is within the limit with both target points A and C, then analysis point B is a stable point under this standard; it should be noted that if points A and C cannot be measured directly during pairwise comparison analysis, it is possible to indirectly judge whether points AC exceed or meet the limit under each standard by first measuring A and B1, and then measuring B1 and C;

[0025] The comprehensive analysis is more comprehensive and the judgment is more accurate, especially the judgment method of the relative accuracy of the coordinate difference. Compared with the traditional adjustment calculation method, the correction ability is significantly improved. More importantly, it can accurately reflect the individual changes of each traverse point, which is convenient for timely adoption of targeted measures for correction.

[0026] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A stability analysis method for control points in a tunnel, characterized by: The following steps are involved: S1. Establish a wire control network and a leveling network in the tunnel, and re-measure the control points to obtain two sets of side length data and two sets of elevation data between any two adjacent control points, two sets of three-dimensional coordinate data of any control point, and two sets of horizontal angle data with any control point as the corner point; S2, selecting a control point as the analysis point, taking the two control points adjacent to the analysis point as the foresight point and the backsight point respectively, performing a comparison of the two sets of horizontal angle data obtained after the re-measurement to obtain a horizontal angle difference, and judging whether the horizontal angle difference meets the standard; S3. Establish a deviation limitation system between two adjacent control points, including the standard of side length difference, the standard of elevation difference and the relative accuracy standard of the difference between coordinates; The side length difference standard is to compare the two sets of side length data obtained after re-measurement between the two control points to obtain the side length difference, determine whether the side length difference meets the specified standard, and take the average value of the two sets of side length data as the side length S of the two target points; The elevation difference standard is to compare the two sets of elevation data obtained after re-measurement between two control points to obtain the elevation difference, and judge whether the elevation difference meets the specified standard; The relative accuracy standard of the difference between coordinates is that after re-measuring the three-dimensional coordinates of the two control points, the three-dimensional coordinate increments △X, △Y, △Z of each control point can be obtained, and the relative accuracy of the difference between the coordinates of the two control points is calculated: Among them, △X ij, △Y ij, is the difference in the two-dimensional coordinate increment between adjacent control points i and j, △Z ij is the difference in Z-direction coordinate increments between adjacent control points i and j; determines whether the relative accuracy of the coordinate difference meets the specified standard; S4. Take the two control points adjacent to the analysis point as two target points, compare the deviation limitation systems of the three control points two by two, and comprehensively judge the poor horizontal angle to obtain the stability of the analysis point.

2. The stability analysis method of control points in a tunnel according to claim 1 is characterized in that: In S4, if the analysis point exceeds the limit with both target points, but meets the limit between the two target points, the analysis point is an unstable point; if the analysis point meets the limit with one target point and exceeds the limit with the other target point, the analysis point is a point to be observed; if the analysis point meets the limit with both target points, the analysis point is a stable point.

3. The stability analysis method of control points in a tunnel according to claim 1 is characterized by: The conductor control network in the tunnel has two rows of control points.

4. The stability analysis method of control points in a tunnel according to claim 1 is characterized by: The side length S is 200~500m.

5. The stability analysis method of control points in a tunnel according to claim 1 is characterized by: The horizontal angle error standard is no more than 3″; the side length error standard is no more than 2mD=2(a+bD), unit mm, where a is the fixed error in the nominal accuracy of the total station distance measurement, unit mm, b is the proportional coefficient in the nominal accuracy of the total station distance measurement, unit mm / km, and D is the distance measurement length, unit km; the elevation error standard is , unit: mm; the relative accuracy standard of coordinate difference is no more than 1 / 50000.

6. The stability analysis method of control points in a tunnel according to claim 1 is characterized by: The re-survey equipment includes total station, prism and level.

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