Tunnel advanced forecast seismic source excitation device

Abstract

The utility model relates to a tunnel advanced forecast seismic source excitation device, and belongs to the field of tunnel advanced geological forecast. Comprising a fixing piece arranged on surrounding rock and a connecting piece movably arranged on the fixing piece, and a hammering piece is fixedly arranged on the connecting piece; the fixing piece comprises a fixed cuboid fixing section and a semi-cylinder, the connecting piece comprises a flange section rotationally connected into the semi-cylinder and a web section connected to the center of the flange section, and the hammering piece is connected to the web section; the hammering piece and the web section rotate around the flange section and then fall down to hammer an excitation point of the surrounding rock, the surrounding rock vibrates from the excitation point, and when the size and parameters of the device and the height of the hammering piece before release are fixed, the magnitude of excited vibration is fixed. According to the utility model, the excited seismic source is continuous and stable, and the acquired seismic source data is high in quality and high in accuracy.

Description

Technical Field

[0001] The utility model belongs to the field of tunnel advanced geological prediction and relates to a tunnel advanced prediction earthquake source excitation device. Background Art

[0002] With the continuous advancement of transportation construction, the situation of safe production has become increasingly severe. Tunnel construction has been moving towards the de-explosive method. The previous advanced geological prediction method using emulsion explosives as the source of excitation has gradually been replaced by artificial excitation. TSP (tunnel advanced prediction) is a tunnel advanced geological prediction method with artificial excitation sources and is widely used in the process of tunnel construction. TSP (tunnel advanced prediction) is a multi-wave and multi-component high-resolution seismic reflection wave detection technology. It generates seismic waves (elastic waves) by artificially creating a series of regularly arranged slight sources to form a seismic source section. Seismic waves propagate in the rock in the form of spherical waves. When seismic waves encounter rock wave impedance difference interfaces (such as broken zones, faults or weak interlayers, etc.), part of them are reflected. The reflected wave signal will be received and recorded by two highly sensitive three-component acceleration seismic sensors arranged on the left and right walls of the tunnel. The TSP artificial excitation source is mainly to stimulate the source by artificially hammering the surrounding rock to generate vibration during data collection. Affected by the on-site operating environment and the human body, it is impossible to generate a stable impact force to stimulate the source, resulting in inconsistent data quality, which in turn affects the judgment of data interpreters on the poor geological bodies of the tunnel and affects the safe production of the tunnel. Therefore, in order to ensure the data quality of the artificial excitation source, it is necessary to develop a stable source excitation device.

[0003] At present, the methods of artificially exciting seismic sources are mostly powered devices such as vibration devices, gas source devices and controllers. However, in tunnels, the environment is harsh, the space is small, and the basic conditions are poor. It is extremely inconvenient to carry and move these powered devices. In addition, there are few power supply devices in the tunnel, and it is not easy to achieve the power-on effect of the vibration device, which is not conducive to work. Therefore, there is a lack of seismic source excitation devices that are easy to carry, easy to operate, and do not rely on electricity during operation. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a tunnel advance prediction source excitation device to improve the data acquisition quality, so as to obtain high-quality tunnel advance geological prediction data and accurately judge the poor geological body of the tunnel.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] A tunnel advance prediction earthquake source excitation device comprises a fixing part arranged on the surrounding rock, and a rotating member rotatably connected to the fixing part; the rotating member performs a circular motion with the fixing part as the center until it hits an excitation point on the surrounding rock, thereby causing the surrounding rock to vibrate.

[0007] Optionally, the rotating component includes a connecting member rotatably connected to the fixing member, and a hammering member arranged at one end of the connecting member away from the fixing member; the hammering member performs a circular motion with the fixing member as the center and then strikes the excitation point.

[0008] Optionally, the connecting member is a T-shaped structure, including a flange section and a web section that are perpendicular to each other; one end of the web section is fixedly connected to the middle part of the flange section, and the other end is fixedly connected to the hammer piece; the flange section is connected to the fixing member by rotating around its circumference.

[0009] Optionally, a groove is provided on the fixing member, the opening of the groove is toward a side away from the surrounding rock, the flange section is embedded in the groove, and rotates around the circumference of the flange section in the groove.

[0010] Optionally, the fixing member includes a rectangular fixing section arranged on the surrounding rock, and a semi-cylinder arranged on the side of the rectangular fixing section away from the surrounding rock; a groove with an opening facing the side away from the surrounding rock is arranged in the semi-cylinder, and the flange section is embedded in the groove and rotates circumferentially around the flange section in the groove.

[0011] Optionally, the semi-cylinder is surrounded by a rectangular plane and a curved surface, and the semi-cylinder is arranged on the rectangular fixed section in a manner in which its axial direction is horizontal; the rectangular plane is arranged to fit the side of the rectangular fixed section away from the surrounding rock; and the opening of the groove faces the curved surface.

[0012] Optionally, a straight-line distance from the fixing member to the excitation point is less than or equal to a length of the web segment.

[0013] Optionally, the hammering member is an iron hammer.

[0014] Optionally, the fixing member is a steel member.

[0015] Optionally, the connecting member is a steel member.

[0016] The beneficial effects of the utility model are:

[0017] The utility model has a simple structure, is easy to carry and move, is easy to operate, and can adapt to adverse working conditions in tunnels; it does not rely on power conditions, and can produce a uniform and stable seismic source in the surrounding rock only by manual operation; it mainly utilizes the impact force generated by the circular motion of the hammer part around the fixed part to stimulate the surrounding rock to vibrate, the seismic source is uniform and stable, the collected vibration data is of high quality, and the accuracy of data interpretation can be improved.

[0018] The earthquake source excitation device of the utility model does not need to be driven by other external power sources, is simple and portable, and has strong practicality.

[0019] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0021] Figure 1 This is a side view of the source excitation device before hammering;

[0022] Figure 2 It is a side view of the source excitation device when hammering;

[0023] Figure 3 This is a top view of the seismic source excitation device.

[0024] Reference numerals:

[0025] 1 surrounding rock, 2 fixing part, 21 cuboid fixing section, 22 semi-cylinder, 23 groove, 3 rotating member, 31 connecting part, 311 flange section, 312 web section, 32 hammering part, 4 excitation point. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0027] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] See also Figure 1 to Figure 3 , is a tunnel advance prediction earthquake source excitation device, including a fixing part 2 set on the tunnel surrounding rock 1, and a rotating member 3 rotatably set on the fixing part 2. The rotating member 3 includes a connecting member 31 rotatably connected to the fixing part 2, and also includes a hammering member 32 set on the connecting member 31. After the hammering member 32 is released, the hammering member 32 moves in a circle around the fixing part 2 until it hits the excitation point 4 of the tunnel surrounding rock 1, so that the surrounding rock 1 vibrates from the excitation point 4, thereby achieving the effect of exciting the earthquake source. Then, the vibration generated by the surrounding rock 1 is collected through the data acquisition equipment. After collection and analysis, the relevant analysis data of the tunnel advanced geological prediction is obtained, and the unfavorable geological body in the tunnel is accurately judged.

[0030] The fixing member 2 includes a rectangular fixing section 21 fixedly set on the surrounding rock 1, and a semi-cylinder 22 fixedly connected to the rectangular fixing section 21, the semi-cylinder 22 is surrounded by a rectangular plane, two oppositely arranged semi-circular planes and an arc surface, wherein the rectangular plane part is in contact with the side of the rectangular fixing section 21 away from the surrounding rock 1, and the two semi-circular planes are perpendicular to the ground plane; a groove 23 opening toward the arc surface is provided on the semi-cylinder 22.

[0031] The connecting member 31 is a T-shaped structure, including a flange section 311 and a web section 312 which are perpendicular to each other. One end of the web section 312 is connected to the middle of the flange section 311, and the other end is connected to the hammer member 32. The flange section 311 is horizontally embedded in the groove 23 of the fixing member 2. The flange section 311 can rotate around its circumference in the groove 23, driving the web section 312 to rotate around the fixing member 2. The straight-line distance from the fixing member 2 to the excitation point 4 is less than or equal to the length of the web section 312.

[0032] During operation, the tunnel advance prediction earthquake source excitation device of the utility model will not be affected by other external forces. When the mass and initial speed of the hammer member 32, the height of the hammer member 32, the length of the connecting member 31 and the angle with the vertical direction are determined to be consistent, the excited earthquake source can be continuously stable.

[0033] In some embodiments of the present invention, the hammer 32 is a hammer of about 12 pounds, and the fixing member 2 and the connecting member 31 are both ordinary steel components.

[0034] Attached Figures 1 to 3 The dimensions are in cm.

[0035] The utility model has a simple structure, is easy to carry and move, is easy to operate, and can adapt to the adverse working conditions in the tunnel; it does not rely on power conditions, and can produce a uniform and stable seismic source in the surrounding rock only by manual operation; it mainly uses the impact force generated by the circular motion of the hammer part 32 around the fixing part 2 to stimulate the surrounding rock 1 to vibrate, the seismic source is uniform and stable, the collected vibration data is of high quality, and the accuracy of data interpretation can be improved; the seismic source excitation device of the utility model does not need to be driven by other external power sources, is simple and portable, and has strong practicality.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A tunnel advance prediction earthquake source excitation device, characterized in that: It comprises a fixing part (2) arranged on a surrounding rock (1), and a rotating member (3) rotatably connected to the fixing part (2); the rotating member (3) performs a circular motion with the fixing part (2) as the center until it strikes an excitation point (4) on the surrounding rock (1), thereby causing the surrounding rock (1) to vibrate.

2. The tunnel advance prediction earthquake source excitation device according to claim 1 is characterized in that: The rotating member (3) comprises a connecting member (31) rotatably connected to the fixing member (2), and a hammer member (32) arranged at an end of the connecting member (31) away from the fixing member (2); the hammer member (32) performs a circular motion with the fixing member (2) as the center and then strikes the excitation point (4).

3. The tunnel advance prediction earthquake source excitation device according to claim 2 is characterized in that: The connecting member (31) is a T-shaped structure, comprising a flange section (311) and a web section (312) which are perpendicular to each other; one end of the web section (312) is fixedly connected to the middle of the flange section (311), and the other end is fixedly connected to the hammering member (32); the flange section (311) is connected to the fixing member (2) in a circumferentially rotatable manner.

4. The tunnel advance prediction earthquake source excitation device according to claim 3 is characterized in that: The fixing member (2) is provided with a groove (23), the opening of the groove (23) is directed toward a side away from the surrounding rock (1), the flange section (311) is embedded in the groove (23), and rotates around the circumference of the flange section (311) in the groove (23).

5. The tunnel advance prediction earthquake source excitation device according to claim 3 is characterized in that: The fixing member (2) comprises a rectangular fixing section (21) arranged on the surrounding rock (1), and a semi-cylinder (22) arranged on a side of the rectangular fixing section (21) away from the surrounding rock (1); a groove (23) is arranged in the semi-cylinder (22) with an opening facing the side away from the surrounding rock (1); the flange section (311) is embedded in the groove (23) and rotates around the circumference of the flange section (311) in the groove (23).

6. The tunnel advance prediction earthquake source excitation device according to claim 5 is characterized in that: The semi-cylinder (22) is formed by enclosing a rectangular plane and a curved surface. The semi-cylinder (22) is arranged on the rectangular fixed section (21) in a manner in which its axial direction is horizontal; the rectangular plane is arranged to fit with a side of the rectangular fixed section (21) away from the surrounding rock (1); and the opening of the groove (23) faces the curved surface.

7. The tunnel advance prediction earthquake source excitation device according to claim 3 is characterized in that: The straight-line distance from the fixing member (2) to the excitation point (4) is less than or equal to the length of the web section (312).

8. The tunnel advance prediction earthquake source excitation device according to claim 2 is characterized in that: The hammering member (32) is an iron hammer.

9. The tunnel advance prediction earthquake source excitation device according to claim 2 is characterized in that: The fixing member (2) is a steel component.

10. The tunnel advance prediction earthquake source excitation device according to claim 2, characterized in that: The connecting member (31) is a steel member.

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