A deep-buried tunnel surrounding rock internal deformation on-site detection system

Abstract

The utility model provides a kind of deep-buried tunnel surrounding rock internal deformation field detection system, the side excavation of tunnel has with its intersection branch hole, the side excavation of branch hole has multiple parallel to the test branch hole of tunnel, multiple test branch holes respectively pass through the surrounding rock section of different lithology stratum, at least one test branch hole is provided with in-situ rock mass high-pressure deformation test point, at least one test branch hole is provided with sound wave test point, at least one test branch hole is provided with horizontal multipoint displacement meter test point, the mechanical properties and long-term deformation law of different lithology stratum are synchronously tested and do not interfere with each other, it is convenient to compare and observe the difference of the mechanical properties and deformation law of surrounding rock under not too lithology stratum;Long-term monitoring reflects the real state of rock mass, makes scientific prediction and early warning for long-term stability of tunnel.

Description

Technical Field

[0001] This utility model relates to the field of suspension sampling technology, and in particular to a field detection system for internal deformation of surrounding rock in deeply buried tunnels. Background Technology

[0002] Deep-buried tunnel engineering faces complex geological conditions and key technical challenges such as high ground stress and surrounding rock stability. Under continuous high stress, the rock mass may experience creep, leading to deformation risks in the long-term support of the tunnel. Currently, long-term deformation monitoring of the surrounding rock relies heavily on laboratory monitoring methods such as mechanical testing of collected rock samples. These methods cannot reflect the true state of the underground rock mass, and engineers find it difficult to predict the long-term stability of the tunnel based on laboratory data. Furthermore, it is challenging to anticipate potential instability and failure and to promptly remedy and strengthen the support. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a field detection system for internal deformation of surrounding rock in deep-buried tunnels, which can solve the problem that indoor tests cannot obtain accurate and long-term rock mass characteristics.

[0004] Therefore, the present invention adopts the following technical solution: A field detection system for internal deformation of surrounding rock in a deep-buried tunnel includes an adit excavated on one side of the tunnel, and multiple test adits parallel to the tunnel excavated on one side of the adit. The multiple test adits pass through surrounding rock sections with different lithological strata. At least one of the test adits is equipped with an in-situ high-pressure deformation test point, at least one of the test adits is equipped with an acoustic test point, and at least one of the test adits is equipped with a horizontal multi-point displacement meter test point.

[0005] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions: The test tunnel includes a first test tunnel and a second test tunnel. The surrounding rock section includes a first surrounding rock section and a second surrounding rock section. The second test tunnel is entirely located in the first surrounding rock section, and a portion of the first test tunnel is located in the first surrounding rock section, with the remainder located in the second surrounding rock section.

[0006] The first test tunnel, located in the second surrounding rock section, is equipped with several in-situ high-pressure deformation test points for rock mass.

[0007] The first test tunnel, located in the second surrounding rock section, is equipped with several acoustic test points.

[0008] A horizontal multi-point displacement meter test point is set between the tunnel and the first test adit located in the second surrounding rock section.

[0009] The second test tunnel is equipped with several in-situ high-pressure deformation test points for rock mass.

[0010] A horizontal multi-point displacement meter test point is provided between the second test tunnel and the first test tunnel located in the first surrounding rock section.

[0011] The first test tunnel, located in the first surrounding rock section, is equipped with several acoustic test points.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects: it can simultaneously test the mechanical properties and long-term deformation patterns of different rock types without interfering with each other, making it easy to compare and observe the differences in the mechanical properties and deformation patterns of the surrounding rock under different rock types; long-term monitoring reflects the true state of the rock mass, providing scientific prediction and early warning for the long-term stability of the tunnel. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting this utility model. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this utility model.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] This utility model provides a field detection system for internal deformation of surrounding rock in a deep-buried tunnel. An adit 1 is excavated on one side of the tunnel, intersecting with it. Multiple test adit 1 are excavated on one side of the adit 1, parallel to the tunnel. The multiple test adit traverses surrounding rock sections with different lithological strata. At least one test adit is equipped with an in-situ high-pressure deformation test point 5, at least one test adit is equipped with an acoustic test point 4, and at least one test adit is equipped with a horizontal multi-point displacement meter test point 6.

[0017] like Figure 1 As shown in the figure, this embodiment provides an on-site testing system for the surrounding rock sections of two test tunnels and two types of lithological strata.

[0018] In this embodiment, the in-situ high-pressure deformation test point 5 is used to place the rigid plate center hole method rock mass deformation test device to test the mechanical properties of the rock mass under high pressure; the acoustic test point 4 is used to place the acoustic test device to monitor the relaxation depth of the rock mass; and the horizontal multi-point displacement meter test point 6 is used to install the horizontal multi-point displacement meter to measure the internal deformation of the rock mass.

[0019] The test tunnels include the first test tunnel 2 and the second test tunnel 3. The surrounding rock sections include the first surrounding rock section and the second surrounding rock section. The second test tunnel 3 is entirely located in the first surrounding rock section, and part of the first test tunnel 2 is located in the first surrounding rock section and the rest is located in the second surrounding rock section.

[0020] like Figure 1 As shown in the figure, the dashed lines are the dividing lines between two types of lithology. The first surrounding rock section is type B lithology, and the second surrounding rock section is type A lithology. Type A lithology may be hard and brittle rock strata such as granite, quartzite, thick limestone, etc., while type B lithology may be soft and tough rock strata such as shale, mudstone, slate, etc. The specific lithology of type A and type B lithology is not limited, but only represents two different types of lithology. The actual construction shall prevail.

[0021] In this embodiment, branch tunnel 1 is excavated vertically to one side of the tunnel, with a length of 60m and a cross-section in the shape of a city gate, with a width × height of 3.0m × 3.0m; the first test branch tunnel 2 is excavated vertically to branch tunnel 1, with a length of 50m and a cross-section in the shape of a city gate, with a width × height of 5m × 5m, penetrating the first surrounding rock section and the second surrounding rock section (i.e., Class A rock strata and Class B rock strata); the second test branch tunnel 3 is excavated vertically to branch tunnel 1, with a length of 30m and a cross-section in the shape of a city gate, with a width × height of 3.0m × 3.0m, located in the first surrounding rock section (i.e., Class B rock strata).

[0022] Several in-situ high-pressure deformation test points 5 of the first test tunnel 2 located in the second surrounding rock section are set up.

[0023] like Figure 1 As shown, the first test tunnel 2, located in the second surrounding rock section, has three in-situ high-pressure deformation test points 5.

[0024] Several acoustic test points 4 are set up in the first test tunnel 2 located in the second surrounding rock section.

[0025] like Figure 1 As shown, the first test tunnel 2 located in the second surrounding rock section has three acoustic test points 4. The testing range of the three acoustic test points 4 is only within the second surrounding rock section (i.e., within the Class A rock layer).

[0026] A horizontal multi-point displacement meter test point 6 is set between the tunnel and the first test adit 2 located in the second surrounding rock section. The horizontal multi-point displacement meter is arranged in the Class A rock layer at a depth of 20m in the tunnel. The distances of the test point from the borehole opening are 1m, 3m, 5m, 7m and 15m respectively.

[0027] The test data from the acoustic wave testing device and the horizontal multi-point displacement meter installed in the second surrounding rock section can be cross-validated, thereby improving the reliability of deformation data in the second surrounding rock section.

[0028] The second test tunnel 3 is equipped with several in-situ high-pressure deformation test points 5 for rock mass.

[0029] like Figure 1 As shown, the second test tunnel 3 is equipped with three in-situ high-pressure deformation test points 5.

[0030] A horizontal multi-point displacement meter test point 6 is set between the second test tunnel 3 and the first test tunnel 2 located in the first surrounding rock section. The horizontal multi-point displacement meter is arranged in the Class B rock layer at a depth of 20m. The distances of the test point from the borehole opening are 1m, 3m, 5m, 7m and 15m respectively.

[0031] Several acoustic test points 4 are set up in the first test tunnel 2 located in the first surrounding rock section.

[0032] like Figure 1 As shown, the first test tunnel 2 located in the first surrounding rock section has three acoustic test points 4. The test range of the three acoustic test points 4 is only within the first surrounding rock section (i.e., within the Class B rock layer).

[0033] The test data from the acoustic wave testing device and the horizontal multi-point displacement meter installed in the first surrounding rock section can be cross-validated, thereby improving the reliability of deformation data in the first surrounding rock section.

[0034] The locations of the acoustic test point 4 and the in-situ rock mass high-pressure deformation test point 5 should not interfere with each other. In this embodiment, the in-situ rock mass high-pressure deformation test point 5 is located close to the working face and within 15m of the working face. The acoustic test point 4 located in the first surrounding rock section is arranged at a depth of 15m in the first test tunnel 2 to monitor the relaxation depth of the B-type rock layer. The acoustic test point 4 located in the second surrounding rock section is arranged at a distance of 15m from the top working face of the first test tunnel 2 to monitor the relaxation depth of the A-type rock layer.

[0035] This utility model provides a field detection system for the internal deformation of the surrounding rock of a deeply buried tunnel. It integrates tests conducted at in-situ high-pressure deformation test point 5, acoustic test point 4, and horizontal multi-point displacement gauge test point 6. By periodically collecting data, it can capture the long-term deformation of the surrounding rock of the tunnel, analyze the mechanical properties and long-term deformation patterns of the two types of rock masses, and provide a basis for the study of the stability of the surrounding rock of the deeply buried tunnel. If the deformation data tends to stabilize six months after the support is completed, it indicates that the current support scheme is effective and reliable. If the data shows that the surrounding rock deformation continues to develop, it can provide early warning signals for engineers to strengthen the tunnel support in a timely manner. The data from continuous monitoring after six months can also be used to predict whether the long-term operation of the tunnel is safe and stable.

[0036] Based on the description and accompanying drawings of this utility model, those skilled in the art can easily manufacture or use the on-site detection system for internal deformation of surrounding rock in deep-buried tunnels according to this utility model, and can achieve the positive effects described in this utility model.

[0037] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "connected," and "sleeve-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In the description of this utility model, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0039] Furthermore, in practicing the claims of this utility model, those skilled in the art can understand and influence variations to the disclosed embodiments through a study of the drawings, the disclosure, and the appended claims. Additionally, in the claims and description, words such as "comprising" and "containing" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the present utility model are covered by the scope of the claims of the present utility model, and will not be listed here.

Claims

1. A field detection system for internal deformation of surrounding rock in a deeply buried tunnel, wherein a branch tunnel (1) intersects with one side of the tunnel, characterized in that, Multiple test tunnels parallel to the tunnel are excavated on one side of the branch tunnel (1). The multiple test tunnels pass through the surrounding rock sections of different lithological rock layers. At least one of the test tunnels is equipped with an in-situ high-pressure deformation test point (5), at least one of the test tunnels is equipped with an acoustic test point (4), and at least one of the test tunnels is equipped with a horizontal multi-point displacement meter test point (6).

2. The on-site deformation detection system for the surrounding rock of a deep-buried tunnel as described in claim 1, characterized in that, The test tunnel includes a first test tunnel (2) and a second test tunnel (3). The surrounding rock section includes a first surrounding rock section and a second surrounding rock section. The second test tunnel (3) is entirely located in the first surrounding rock section. A portion of the first test tunnel (2) is located in the first surrounding rock section, and the remainder is located in the second surrounding rock section.

3. The on-site detection system for internal deformation of surrounding rock in a deep-buried tunnel as described in claim 2, characterized in that, The first test tunnel (2) located in the second surrounding rock section is equipped with several in-situ high-pressure deformation test points (5).

4. The on-site detection system for internal deformation of surrounding rock in a deep-buried tunnel as described in claim 2, characterized in that, The first test tunnel (2) located in the second surrounding rock section is equipped with several acoustic test points (4).

5. A field detection system for internal deformation of surrounding rock in a deep-buried tunnel as described in claim 2 or 4, characterized in that, A horizontal multi-point displacement meter test point (6) is provided between the tunnel and the first test adit (2) located in the second surrounding rock section.

6. The on-site detection system for internal deformation of surrounding rock in a deep-buried tunnel as described in claim 2, characterized in that, The second test tunnel (3) is equipped with several in-situ high-pressure deformation test points (5) of the rock mass.

7. The on-site detection system for internal deformation of surrounding rock in a deep-buried tunnel as described in claim 2, characterized in that, A horizontal multi-point displacement meter test point (6) is provided between the second test tunnel (3) and the first test tunnel (2) located in the first surrounding rock section.

8. A field detection system for internal deformation of surrounding rock in a deep-buried tunnel as described in claim 2 or 7, characterized in that, The first test tunnel (2) located in the first surrounding rock section is equipped with several acoustic test points (4).

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