A method for determining the boundary range of a boulder

Abstract

The application discloses a boulder boundary range determination method, and is applied to the technical field of shield tunneling method. The method comprises the following steps: adopting a micro-motion detection method to preliminarily determine the first position of a high-speed body along a tunnel center line and two side lines; adopting an electromagnetic method to preliminarily determine the second position of the high-speed body along the tunnel center line; determining the boulder range in combination with the first position and the second position of the high-speed body; adopting a geological drill to drill a hole at the center point in the boulder range to determine the elevation in the boulder range; and determining the boulder boundary range in the center point in the boulder range. The boulder on the line is accurately positioned and treated, the influence caused by the untreated or incompletely treated boulder is avoided, and the normal tunneling of the shield and the quality requirement of the shield tunnel are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunneling, in particular to a method for determining the boundary range of a boulder. BACKGROUND

[0002] In the process of tunnel engineering construction, boulders are often encountered. Boulder is a unique geological phenomenon in the weathering process of rock mass. In the project of tunneling construction using shield method, due to the different shapes and strengths of boulders, it is difficult for the shield machine to break the boulders. In the construction process, problems such as serious cutter wear and deformation may occur, which may lead to serious situations such as shield turning and deviation from the tunnel axis, greatly affecting the safety and progress of tunnel engineering construction. Therefore, it is necessary to detect the boulders in tunnel shield construction and take reasonable measures to break the boulders to ensure the smooth progress of shield construction and reduce construction risks and costs. How to provide a method for determining the boundary range of a boulder is a problem that needs to be solved by those skilled in the art. SUMMARY

[0003] Therefore, the present application provides a method for determining the boundary range of a boulder, which accurately locates and processes the boulders on the line to avoid the impact caused by unprocessed or incomplete processing of boulders.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A method for determining the boundary range of a boulder, comprising the following steps:

[0006] S1, preliminarily determining the first position of the high-speed body along the tunnel center line and two side lines;

[0007] S2, further determining the second position of the high-speed body along the tunnel center line;

[0008] S3, determining the boulder range in combination with the first position and the second position of the high-speed body;

[0009] S4, drilling a hole at the center point in the boulder range using a geological drill to determine the elevation in the boulder range;

[0010] S5, determining the boundary range of the boulder at the center point in the boulder range.

[0011] Optionally, the first position of the high-speed body is preliminarily determined by using a micro-motion detection method in S1.

[0012] Optionally, in S1, detection points are set on the three lines at a first interval, and each detection point is detected to preliminarily determine the first position of the high-speed body.

[0013] Optionally, the first interval is 4m.

[0014] Optionally, the electromagnetic method is used in S2 to further determine the second position of the high-speed body.

[0015] Optionally, in S2, the detection points are set along the center line of the tunnel at a second interval, and each detection point is detected to further determine the second position of the high-speed body.

[0016] Optionally, the second interval is 2 m.

[0017] Optionally, S5 is specifically: after the boulder elevation range is determined, 1 detection hole is arranged at a third interval as a radius and at a certain angle interval from the center point, and a total of 4 detection holes are arranged to determine the boulder boundary range. If the boulder boundary is not detected in the detection hole, 1 detection hole is further arranged at a third interval from the outer circle of the detection hole. If the boulder boundary is detected in the detection hole, 1 detection hole is further arranged at a fourth interval from the inner circle of the detection hole to determine the boulder boundary range. The above process is repeated until the boulder boundary is determined.

[0018] Optionally, the third interval is 0.5 m, the fourth interval is 0.25 m, and the angle interval of the detection hole is 90 degrees.

[0019] According to the above technical solution, compared with the prior art, the boulder boundary range determination method provided by the present application has the following beneficial effects: the influence caused by the incomplete treatment of the boulder is avoided, and the normal tunneling of the shield and the quality requirements of the shield tunnel are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0021] Figure 1 The flowchart of the boulder boundary range determination method of the present application;

[0022] Figure 2 The schematic diagram of the first position determination method of the high-speed body of the present application;

[0023] Figure 3 The schematic diagram of the second position determination method of the high-speed body of the present application;

[0024] Figure 4 The schematic diagram of the detection hole arrangement of the present application. DETAILED DESCRIPTION

[0025] Clearly and completely, the technical solutions in the embodiments of the present application will be described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The embodiments of the present application disclose a boulder boundary range determination method, as shown in the following steps. Figure 1

[0027] S1, a first position of the high-speed body is preliminarily determined along a tunnel center line and two boundary lines;

[0028] S2, a second position of the high-speed body is further determined along the tunnel center line;

[0029] S3, the boulder range is determined in combination with the first position and the second position of the high-speed body;

[0030] S4, drilling is performed on a center point in the boulder range by using a geological drill to determine the elevation in the boulder range;

[0031] S5, the boulder boundary range is determined in the center point in the boulder range.

[0032] Further, the first position of the high-speed body is preliminarily determined by using a microtremor detection method in S1.

[0033] Specifically, the microtremor is a complex vibration composed of body waves and surface waves, and the energy of the surface waves accounts for more than 70% of the total energy of the signal, and most of the energy propagates in the base mode. Although the amplitude and form of the microtremor signal change with time and space, it has statistical stability within a certain time and space range, and can be described by a time and space stationary random process. Microtremor detection is based on the theory of stationary random process to extract the dispersion curve of the surface wave from the microtremor signal, and to obtain the transverse wave velocity structure of the underground medium through inversion of the dispersion curve.

[0034] The microtremor detection is a geophysical detection method based on microtremor array detection. The working principle of the microtremor detection is as follows: a signal is collected by using a station array (a circular station array or an embedded triangular station array, etc.), a spatial autocorrelation algorithm or a frequency-wavenumber domain algorithm is used to extract the wave dispersion curve from the microtremor array record of each measuring point, then a phase velocity contour map is directly drawn, or apparent wave velocity is calculated, and then a two-dimensional apparent wave velocity profile is obtained by interpolation and smoothing calculation. The phase velocity contour map or the apparent wave velocity profile can objectively and intuitively reflect the lithology change of the stratum, and is a basic basis for geological interpretation.

[0035] Further, as shown in the following steps. Figure 2 ​As shown, S1 sets the detection points on three lines with a first interval, detects each detection point, and preliminarily determines the first position of the high-speed body.

[0036] Further, the first interval is 4 m.

[0037] Further, S2 further determines the second position of the high-speed body by using the electromagnetic method.

[0038] Further, as shown, Figure 3 S2 sets the detection points along the center line of the tunnel with a second interval, detects each detection point, and further determines the second position of the high-speed body.

[0039] Further, the second interval is 2 m.

[0040] Specifically, the first position of the high-speed body is the first range of the solitary stone, the second position of the high-speed body is the second range of the solitary stone, and S3 combines the first range of the solitary stone and the second range of the solitary stone, and takes the overlapping part as the range of the solitary stone for subsequent determination.

[0041] Further, S5 is specifically as follows: after the range of the solitary stone elevation is determined, 1 detection hole is arranged at a third interval as a radius and at a certain angle interval from the center point, a total of 4 detection holes are arranged for determining the range of the solitary stone boundary, if the detection hole does not detect the boundary of the solitary stone, 1 detection hole is further arranged at a distance of a third interval outside the outer circle of the detection hole, if the detection hole detects the boundary of the solitary stone, 1 detection hole is further arranged at a distance of a fourth interval inside the inner circle of the detection hole for determining the range of the solitary stone boundary, and the above process is repeated until the boundary of the solitary stone is determined.

[0042] Further, the third interval is 0.5 m, the fourth interval is 0.25 m, and the angle interval of the detection hole is 90 degrees.

[0043] Specifically, as shown, Figure 4 in this embodiment, sequence 1 is the center point of the range of the solitary stone elevation, 1 detection hole is arranged every 90 degrees with R1=0.5 m as a radius, 4 detection holes sequence 2 are obtained, and sequence 2 is located within the range of the solitary stone boundary, therefore, 4 detection holes sequence 3 are further arranged with R2=1 m as a radius at a distance of 0.5 m outside the outer circle of sequence 2, it can be seen that 3 detection holes of the 4 sequence 3 are outside the range of the solitary stone boundary, and 1 detection hole is within the range of the solitary stone boundary, therefore, detection hole sequence 4 is arranged at a distance of 0.25 m inside the inner circle of the sequence 3 detection hole outside the range of the solitary stone boundary, and 1 detection hole sequence 4 is arranged with R3=1.5 m as a radius at a distance of 0.5 m of the sequence 3 detection hole within the range of the solitary stone boundary, this sequence 4 detection hole is located outside the range of the solitary stone boundary, thus, the arrangement of the detection hole is stopped, and the range of the boundary of the solitary stone is obtained.

[0044] The various embodiments described in this specification are intended to be illustrative only and in no way limit the scope of the application. Changes and modifications can be made by those skilled in the art, which employ the principles of the application, without departing from the scope of the application. Accordingly, the application is not limited to the embodiments described herein, but instead has scope to encompass any choice whatsoever that is dependent on, or can be substituted in, the principal, new and inventive features that are described and defined by the appended claims.

[0045] The above description of disclosed embodiments is intended to be illustrative only and not limiting of the application. Numerous modifications to these embodiments can be made by those skilled in the art without departing from the spirit or scope of the application. The scope of the application is not limited to the embodiments described herein, but instead is intended to encompass any and all changes and modifications that are within the scope of the claims.

Claims

1. A method for determining the boundary range of an isolated rock, characterized in that, Includes the following steps: S1. Along the tunnel centerline and two sidelines, the first position of the high-speed body is initially determined; S2. Further determine the second location of the high-speed body along the tunnel centerline; S3. Determine the range of the isolated rock by combining the first and second positions of the high-speed body; S4. Drill a hole at the center point of the isolated rock area using a geological drill to determine the elevation within the isolated rock area; S5. Determine the boundary range of the isolated rock within the center point of the isolated rock area; In S1, detection points are set at the first interval on the three lines, and each detection point is detected to initially determine the first position of the high-speed body; In S2, detection points are set at the second interval along the centerline of the tunnel. Each detection point is detected to further determine the second position of the high-speed body. S5 specifically involves: After determining the elevation range of the boulder, setting up a borehole at a certain angle with the third spacing as the radius at the center point, for a total of 4 boreholes to determine the boundary range of the boulder. If the borehole does not detect the boundary of the boulder, then setting up another borehole at the distance of the third spacing outside the borehole. If the borehole detects the boundary of the boulder, then setting up another borehole at the distance of the fourth spacing inside the borehole to determine the boundary range of the boulder. Repeating the above process until the boundary of the boulder is determined.

2. The method for determining the boundary range of an isolated rock according to claim 1, characterized in that, In S1, the first position of the high-speed body is initially determined using a micro-motion detection method.

3. The method for determining the boundary range of an isolated rock according to claim 1, characterized in that, The first spacing is 4m.

4. The method for determining the boundary range of an isolated rock according to claim 1, characterized in that, In S2, the electromagnetic method is used to further determine the second position of the high-speed body.

5. The method for determining the boundary range of an isolated rock according to claim 1, characterized in that, The second spacing is 2m.

6. The method for determining the boundary range of an isolated rock according to claim 1, characterized in that, The third spacing is 0.5m, the fourth spacing is 0.25m, and the borehole layout angle is 90 degrees.

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