Underground site investigation equipment capable of actively reducing noise and based on active source seismic wave inversion

Abstract

The invention provides underground site investigation equipment capable of actively reducing noise and based on active source seismic wave inversion, and relates to the technical field of seismic data detection. The underground site investigation equipment based on active source seismic wave inversion comprises a fixing sleeve, the top of the fixing sleeve is fixedly connected with a connecting sleeve, and the top of the fixing sleeve is fixedly connected with a bearing plate. Through a spring, a damping spring, a chassis, a pressure sensor and a sliding column, when the equipment is subjected to external vibration or pressure change, the sliding column slides in a sliding groove, external impact force is buffered, and internal precision detection components are protected. The pressure sensor monitors the change of external pressure in real time and feeds back information to an operator, so that the equipment state is adjusted in time, the stability of the detection process is maintained, and when a seismic wave signal is transmitted, the spring plays an elastic buffering and adjusting role, so that the detector can capture a weak signal more sensitively, the influence of external interference on signal acquisition is effectively reduced, and the detection accuracy is improved. And the acquisition precision of the seismic wave signal by the detection assembly is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic data detection, and in particular to underground site survey equipment based on active source seismic wave inversion and capable of active noise reduction. Background Art

[0002] Earthquakes, also known as ground movements or earthquake vibrations, are natural phenomena caused by the rapid release of energy from the earth's crust, which produces seismic waves. The main cause of earthquakes is the mutual compression and collision between plates on the earth, which causes displacement and rupture at the edges and inside of the plates.

[0003] The operator will not be able to grasp the pressure between the equipment and the ground in time. Under complex geological conditions, such as soft soil foundation areas, the equipment may sink or tilt due to pressure changes, resulting in poor contact between the detection components and the ground. In this case, the detection components cannot stably collect seismic wave signals, and the collected data will fluctuate and deviate, reducing the reliability of the data and making subsequent analysis and geological structure judgment based on these data inaccurate. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an underground site survey equipment based on active source seismic wave inversion with active noise reduction, which solves the problem that operators cannot timely grasp the pressure conditions between the equipment and the ground. Under complex geological conditions, such as soft soil foundation areas, the equipment may sink or tilt due to pressure changes, resulting in poor contact between the detection component and the ground. In this case, the detection component cannot stably collect seismic wave signals, and the collected data will fluctuate and deviate, reducing the reliability of the data and making subsequent analysis and geological structure judgment based on these data lose accuracy.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an underground site survey equipment based on active source seismic wave inversion with active noise reduction, comprising a fixed sleeve, a connecting sleeve fixedly connected to the top of the fixed sleeve, a bearing plate fixedly connected to the top of the bearing plate, a receiving device fixedly connected to the top of the fixed sleeve, a fixed rod fixedly connected to the bottom of the fixed sleeve, a sliding sleeve slidably connected to the bottom of the fixed rod, a uniformly distributed rotating sleeve rotatably connected to the outer wall of the connecting sleeve, a connecting rod fixedly connected to the bottom of the rotating sleeve, a telescopic rod slidably connected to the bottom of the connecting rod, a limit lock is sleeved between the telescopic rod and the connecting rod, and a detection component is arranged at the bottom of the threaded rod.

[0006] Preferably, the detection assembly includes a chassis, the base is rotatably connected to the bottom of the threaded rod, and the bottom of the chassis is provided with evenly distributed sliding grooves.

[0007] Preferably, evenly distributed springs are fixedly connected inside the chassis, and one end of the spring is fixedly connected to a detector.

[0008] Preferably, one end of the limit lock is rotatably connected to a rotating plate, and the rotating plate is rotatably connected to the sliding sleeve, and the bottom of the fixed rod is internally threadedly connected to a threaded rod.

[0009] Preferably, a uniformly distributed pressure sensor is fixedly connected to the bottom of the chassis, and a damping spring is fixedly connected to the bottom of the pressure sensor.

[0010] Preferably, one end of the damping spring is fixedly connected to a sliding column, and the sliding column is slidably connected to the inner wall of the sliding groove.

[0011] Preferably, the main source module includes a vibration isolation base and a multi-modal excitation head; the active noise reduction module is composed of a noise monitoring unit, a reverse cancellation unit and an adaptive control algorithm to achieve physical layer cancellation of noise; the noise monitoring unit monitors the environmental noise signal in real time, the reverse cancellation unit generates a signal that is reverse to the noise for cancellation, the adaptive control algorithm is composed of dynamically adjusting the cancellation strategy according to the noise change, the signal acquisition module is a high-sensitivity detector array with an integrated acoustic shielding structure; the intelligent inversion module analyzes the underground structure based on the noise reduction-inversion joint training model; the control and communication module coordinates system operation and data transmission.

[0012] Preferably, the piezoelectric ceramic damper of the vibration isolation base adaptively adjusts the damping coefficient according to the excitation energy of the earthquake source, and the suppression frequency range is 10-200 Hz.

[0013] Preferably, the spatial distance between the secondary source array and the detector is less than 1 / 4 of the noise wavelength, and the phase difference between the offset signal and the noise is ≤ ±3° Working principle: When conducting underground site survey, the equipment is first started through the control and communication module. The multi-modal excitation head of the main source module generates seismic waves, and the excitation energy is transmitted to the underground medium. When the seismic waves encounter different medium interfaces during underground propagation, reflection and refraction will occur. The piezoelectric ceramic damper of the vibration isolation base adaptively adjusts the damping coefficient according to the source excitation energy, suppresses the vibration in the frequency range of 10-200Hz, reduces the interference of external vibration on the source excitation, and ensures the generation of stable and accurate seismic wave signals. While the seismic wave is propagating, the active noise reduction module starts working. The noise monitoring unit monitors the environmental noise signal in real time and transmits the collected noise data to the adaptive control algorithm. The adaptive control algorithm generates control instructions to the reverse cancellation unit according to the noise changes. The reverse cancellation unit generates signals that are opposite to the noise according to the instructions. These anti-phase signals are superimposed on the environmental noise to achieve noise cancellation at the physical layer, creating a more favorable environment for signal acquisition. The high-sensitivity detector array of the signal acquisition module starts working. Since the detector is connected to the chassis through a spring, it can effectively buffer external shocks and vibrations and improve the stability of signal acquisition. The acoustic shielding structure further reduces the interference of external noise on the detector, ensuring that the detector accurately collects the seismic wave signals reflected and refracted by the underground medium. The collected signals are transmitted to the receiving device, and the pressure sensor and the damping spring work together. The pressure sensor monitors the pressure changes between the detection component and the ground in real time. The damping spring slides in the sliding groove through the sliding column, and adjusts the position and state of the detection component according to the pressure change to ensure that the detection component is in good contact with the ground and stably collects signals. The receiving device transmits the received signal to the intelligent inversion module. The intelligent inversion module analyzes and processes the collected seismic wave signals based on the noise reduction-inversion joint training model, and parses out the structural information of the underground site, such as stratum distribution, underground cavity location, etc. Finally, the control and communication module transmits the results obtained by the intelligent inversion module to external equipment for staff to view and analyze.

[0014] The present invention provides an underground site survey device based on active source seismic wave inversion and capable of active noise reduction. It has the following beneficial effects: The present invention uses springs, damping springs, chassis, pressure sensors and sliding columns. When the equipment is subjected to external vibration or pressure changes, the sliding column slides in the sliding groove to buffer the external impact force and protect the internal precision detection components. The pressure sensor monitors the external pressure changes in real time and feeds back the information to the operator so that the equipment status can be adjusted in time to maintain the stability of the detection process. When the seismic wave signal comes, the spring plays an elastic buffering and regulating role, so that the detector can capture weak signals more sensitively, effectively reduce the impact of external interference on signal acquisition, and improve the detection component's acquisition accuracy of seismic wave signals.

[0015] The present invention is composed of an active noise reduction module consisting of a noise monitoring unit, a reverse cancellation unit and an adaptive control algorithm. The noise monitoring unit monitors the environmental noise signal in real time, the reverse cancellation unit generates a signal that is reverse to the noise for cancellation, and the adaptive control algorithm dynamically adjusts the cancellation strategy according to the noise change. This active noise reduction system can achieve physical layer cancellation of noise, greatly reduce the interference of environmental noise on seismic wave signal collection and analysis, and significantly improve the accuracy and reliability of underground site survey results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of a fixing rod of the present invention; Figure 3 is a schematic diagram of a threaded rod of the present invention; Figure 4 is a cross-sectional schematic diagram of the chassis of the present invention; Figure 5 It is a schematic diagram of the framework of the system capable of active noise reduction of the present invention.

[0017] Among them, 1. Receiving device; 2. Loading plate; 3. Fixed sleeve; 4. Rotating sleeve; 5. Connecting rod; 6. Limit lock; 7. Rotating plate; 8. Fixed rod; 9. Sliding sleeve; 10. Chassis; 11. Telescopic rod; 12. Protective plate; 13. Connecting sleeve; 14. Damping spring; 15. Pressure sensor; 16. Sliding groove; 17. Spring; 18. Detector; 19. Threaded rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0019] like Figure 1-4As shown, the embodiment of the present invention provides an underground site survey equipment based on active source seismic wave inversion with active noise reduction, the main frame: the core structure of the equipment is a fixed sleeve 3, the top of which is firmly connected to the connecting sleeve 13 and the bearing plate 2. The receiving device 1 is placed on the bearing plate 2, which is responsible for collecting and preliminarily processing the seismic wave signals collected by the detection component. The bottom of the fixed sleeve 3 is connected to the fixed rod 8, and the bottom of the fixed rod 8 is slidably connected to the sliding sleeve 9. This connection method enables the equipment to flexibly adjust the bottom support state according to the actual terrain and detection requirements. The outer wall of the connecting sleeve 13 is evenly distributed with rotating sleeves 4, and the bottom of each rotating sleeve 4 is fixed with a connecting rod 5. The bottom of the connecting rod 5 is slidably connected to the telescopic rod 11, and a limit lock 6 is set between the two. One end of the limit lock 6 is rotatably connected to the rotating plate 7, and the rotating plate 7 is rotatably connected to the sliding sleeve 9, thereby realizing the multi-angle and multi-directional extension and fixation of the equipment to adapt to complex site conditions.

[0020] Detection component: The detection component is a key part for obtaining underground information and is located at the bottom of the threaded rod 19. The chassis 10 is rotatably connected to the bottom of the threaded rod 19, and a plurality of evenly distributed sliding grooves 16 are provided at the bottom thereof. A plurality of springs 17 are fixed inside the chassis 10, and the other end of the spring 17 is connected to the detector 18. The spring 17 can buffer external vibrations, allowing the detector 18 to stably collect signals, and can also enhance the ability of the detector 18 to capture weak signals when seismic wave signals are transmitted. A plurality of pressure sensors 15 are fixed at the bottom of the chassis 10, and a damping spring 14 is connected below the pressure sensor 15, and the other end of the damping spring 14 is connected to the sliding column 12, and the sliding column 12 slides in the sliding groove 16. The pressure sensor 15 monitors the external pressure changes in real time, and the damping spring 14 and the sliding column 12 cooperate to adjust the position of the detection component to ensure good contact with the ground and stable signal collection.

[0021] Functional modules Main source module: includes vibration isolation base and multi-mode excitation head. The multi-mode excitation head generates seismic waves and transmits excitation energy to the underground medium. The piezoelectric ceramic damper of the vibration isolation base adaptively adjusts the damping coefficient according to the source excitation energy, suppresses vibrations in the frequency range of 10-200Hz, reduces the interference of external vibrations on source excitation, and ensures the stability and accuracy of seismic wave signals.

[0022] Active noise reduction module: It consists of a noise monitoring unit, a reverse cancellation unit and an adaptive control algorithm. The noise monitoring unit monitors the ambient noise signal in real time and transmits it to the adaptive control algorithm. The adaptive control algorithm generates control instructions to the reverse cancellation unit based on the noise changes. The reverse cancellation unit generates a signal that is opposite to the noise, cancels the noise at the physical layer, and creates a favorable environment for signal acquisition.

[0023] Signal acquisition module: A high-sensitivity detector array with an integrated acoustic shielding structure. The detector is connected to the chassis through a spring to buffer external shock and vibration. The acoustic shielding structure further reduces external noise interference to ensure accurate acquisition of seismic wave signals reflected and refracted by underground media.

[0024] Intelligent inversion module: Based on the noise reduction-inversion joint training model, the received seismic wave signals are deeply analyzed and processed to parse out the structural information of the underground site, such as stratum distribution and underground cavity location.

[0025] Control and communication module: responsible for coordinating the operation of each module of the system and ensuring the orderly transmission of data between modules. At the same time, the results obtained by the intelligent inversion module are transmitted to external devices for the convenience of staff to view and analyze.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An underground site survey device based on active source seismic wave inversion capable of active noise reduction, comprising a fixed sleeve (3), characterized in that: The top of the fixed sleeve (3) is fixedly connected to a connecting sleeve (13), the top of the fixed sleeve (3) is fixedly connected to a carrying plate (2), the top of the carrying plate (2) is fixedly connected to a receiving device (1), the bottom of the fixed sleeve (3) is fixedly connected to a fixing rod (8), the bottom of the fixed rod (8) is slidably connected to a sliding sleeve (9), the outer wall of the connecting sleeve (3) is rotatably connected to a uniformly distributed rotating sleeve (4), the bottom of the rotating sleeve (5) is fixedly connected to a connecting rod (5), the bottom of the connecting rod (5) is slidably connected to a telescopic rod (11), a limit lock (6) is sleeved between the telescopic rod (11) and the connecting rod (5), and a detection component is arranged at the bottom of the threaded rod (19).

2. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 1, characterized in that: The detection assembly comprises a chassis (10), the base (10) being rotatably connected to the bottom of a threaded rod (19), and the bottom of the chassis (10) is provided with evenly distributed sliding grooves (16).

3. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 2, characterized in that: The chassis (10) is internally fixedly connected to a uniformly distributed spring (17), and one end of the spring (17) is fixedly connected to a detector (18).

4. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 1, characterized in that: One end of the limit lock (6) is rotatably connected to a rotating plate (7), and the rotating plate (7) is rotatably connected to the sliding sleeve (9). The bottom of the fixed rod (8) is internally threadedly connected to a threaded rod (19).

5. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 3, characterized in that: A uniformly distributed pressure sensor (15) is fixedly connected to the bottom of the chassis (10), and a damping spring (14) is fixedly connected to the bottom of the pressure sensor (15).

6. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 5, characterized in that: One end of the damping spring (14) is fixedly connected to a sliding column (12), and the sliding column (12) is slidably connected to the inner wall of the sliding groove (16).

7. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 1, characterized in that: The main source module includes a vibration isolation base and a multi-mode excitation head; the active noise reduction module consists of a noise monitoring unit, a reverse cancellation unit and an adaptive control algorithm to achieve physical layer noise cancellation; The noise monitoring unit monitors the environmental noise signal in real time, the reverse cancellation unit generates a signal that is reverse to the noise for cancellation, and the adaptive control algorithm is composed of a signal acquisition module and a high-sensitivity detector array with an integrated acoustic shielding structure that dynamically adjusts the cancellation strategy according to noise changes; The intelligent inversion module analyzes underground structures based on the noise reduction-inversion joint training model; the control and communication module coordinates system operation and data transmission.

8. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 7, characterized in that: The piezoelectric ceramic damper of the vibration isolation base adaptively adjusts the damping coefficient according to the excitation energy of the earthquake source, and the suppression frequency range is 10-200 Hz.

9. The underground site survey equipment based on active source seismic wave inversion capable of active noise reduction according to claim 7, characterized in that: The spatial distance between the secondary source array and the detector is less than 1 / 4 of the noise wavelength, and the phase difference between the offset signal and the noise is ≤±3°.

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