A synchronous testing system and method for longitudinal and transverse waves of rock mass excited by the same source suitable for deep ground conditions

Abstract

The present invention discloses a synchronous testing system and method for rock mass longitudinal and transverse waves of homologous excitation suitable for deep-earth conditions, wherein an excitation sensor and two or more receiving sensors are installed on the sample; the excitation sensor is installed at the sample load loading end in the deep-earth environment simulation cabin, and two or more receiving sensors are installed at the sample load loading end; the front end obtains the excitation signal of the input excitation sensor through the homologous signal trigger module, the homologous signal conditioning module and the front-end signal excitation module, and the back end distinguishes the channel of the received signal and performs synchronous processing through the back-end signal conditioning module and the terminal signal synchronization module to obtain the synchronized received signal and the homologous signal, and displays them in real time through the display and storage module; at the same time, the deep-earth environment where the sample is located is simulated through the measurement and control module that simulates the deep-earth environment. The present invention can realize synchronous testing of different types of signals in a complex deep-earth environment by arranging a variety of signal conditioning modules.

Description

Technical Field

[0001] The present application belongs to the field of deep earth engineering technology, and relates to the testing of homologous waves in rock mass under deep earth environment, and in particular to a synchronous testing system of longitudinal and transverse waves of rock mass under homologous excitation suitable for deep earth conditions. Background Art

[0002] The rock mass in deep underground engineering is not only affected by the coupling of temperature field, stress field, seepage field, etc. in the deep, but also changes in load conditions and deformation caused by engineering construction disturbance, which will cause the structural state of the rock mass to change and deteriorate, and ultimately have an adverse impact on the stability and safety of engineering construction and operation. Therefore, it is of great significance and value to understand the state characteristics of deep rock mass under the influence of comprehensive factors such as occurrence conditions and disturbances, and to establish the correlation between different types of parameters, in order to study the stability of deep engineering rock mass and formulate relevant measures.

[0003] There are many technical means to test the internal state of rock in indoor test, such as industrial CT scanning, nuclear magnetic resonance scanning, acoustic emission monitoring, elastic wave testing, etc. Although longitudinal waves and transverse waves have been used in indoor testing as a type of non-destructive testing, there are many problems in the existing technology in testing: (1) Since the two different types of waves require excitation sources respectively, different types of receiving ends have large time differences; (2) The excitation source and the receiving sensor type must match. If the receiving end model changes, the received signal error will be large, or even erroneous information will be received, causing serious misleading of subsequent analysis results; (3) The excitation source and the receiving end must match the type and the transmission line must be aligned without misalignment. Since the test piece needs to be installed between the excitation source and the receiving end, the alignment of the sensor matching cannot be guaranteed, resulting in unsatisfactory installation results and even the need to re-install. Disassembling and assembling the test pieces not only brings a lot of trouble to the test process, is time-consuming and labor-intensive, and causes unnecessary waste of manpower and material resources, but also leads to unsatisfactory test results; (4) The synchronous monitoring of non-homogeneous signals excited by the same source in a deep complex environment has not yet been achieved; (5) The measurement and control module and the elastic wave test module that simulate the deep earth environment belong to two independent test units and have not been effectively integrated. After the test is completed, it is necessary to manually select the elements that need to be analyzed one by one based on the time recorded in the two independent test units, and then use time as a benchmark to establish the correlation between them one by one. Not only is the entire analysis process time-consuming and labor-intensive, but the correspondence of the analysis results is unreliable due to the time difference between the two test units. Summary of the invention

[0004] The purpose of the present invention is to provide a synchronous testing system for rock mass longitudinal and transverse waves excited by the same source suitable for deep underground conditions in order to solve the above-mentioned technical problems existing in the prior art, so as to realize synchronous testing of different types of signals (longitudinal waves and transverse waves).

[0005] In order to achieve the above object, the present invention adopts the following technical solutions to achieve it.

[0006] The present invention provides a synchronous testing system for rock mass longitudinal and transverse waves for homologous excitation suitable for deep ground conditions, which comprises:

[0007] Display and storage module, used to display and store rock mass longitudinal wave and transverse wave data collected under different deep earth environment simulation conditions;

[0008] The comprehensive processing module is used to send the received signal trigger instruction to the homologous signal trigger module, and send the deep earth environment simulation control and loading control instructions to the measurement and control module simulating the deep earth environment; at the same time, the data returned by the terminal signal synchronization module and the measurement and control module simulating the deep earth environment are summarized;

[0009] A homologous signal trigger module, used to generate an initial homologous signal according to a received signal trigger instruction;

[0010] The homologous signal conditioning module is used to perform preliminary conditioning on the homologous signal and then send it to the front-end signal excitation module; at the same time, the determined starting time and the preliminarily conditioned homologous signal are sent to the terminal signal synchronization module through the synchronization path;

[0011] The front-end signal excitation module adjusts the waveform and state parameters of the homologous signal after preliminary adjustment, generates an excitation signal, and sends the excitation signal to the deep earth environment simulation cabin;

[0012] A deep earth environment simulation chamber is used to simulate the deep earth environment and perform loading and measurement control; an excitation sensor and two or more receiving sensors are installed on the rock sample in the deep earth environment simulation chamber; the excitation sensor is installed at one end of the rock sample in the deep earth environment simulation chamber where the load is loaded, and a receiving sensor group consisting of two or more receiving sensors is installed at the opposite end of the rock sample where the load is loaded; the wave types received by the receiving sensor group include longitudinal waves and transverse waves;

[0013] The back-end signal conditioning module is used to condition the received signal and determine the received signal channel and received signal type;

[0014] The terminal signal synchronization module is used to synchronize the received signals of each channel with the homologous signal, and feed back the received signals of each channel and the homologous signal synchronized therewith to the comprehensive processing module after synchronization processing;

[0015] The measurement and control module for simulating the deep earth environment is used to measure and control the working conditions in the deep earth environment simulation cabin according to the received deep earth environment measurement and control instructions, and feed back the monitoring data to the comprehensive processing module.

[0016] The above-mentioned display and storage module is mainly used to display and store the rock mass longitudinal wave and transverse wave data collected under different deep earth environment simulation conditions and the relevant loading control and measurement result monitoring data of the stress and deformation of rock samples in the deep earth environment simulation chamber based on the data transmitted by the comprehensive processing module; it can be implemented using conventional computers, notebooks, tablets, etc. equipped with display functions in this field.

[0017] The above-mentioned comprehensive processing module is mainly used for data conversion and instruction sending. The comprehensive processing module generates signal trigger control instructions and deep earth environment simulation condition control instructions according to the operation request from the operator, and can be executed according to the timing control. The comprehensive processing module can also perform digital analog signal conversion, which is used to convert the control instruction into a corresponding electrical signal or convert the corresponding electrical signal into a digital signal. In the present invention, the comprehensive processing module can be implemented by a conventional controller, such as a programmable logic controller (PLC).

[0018] The homologous signal trigger module is used to generate a homologous signal that can continue to transmit instructions to subsequent ones according to the signal trigger instruction sent by the comprehensive processing module. Here, the homologous signal trigger module can be implemented by a high-voltage ultrasonic pulse signal transmitter (DPR300).

[0019] The purpose of the homologous signal conditioning module is to perform preliminary and rough adjustment and control of the signal strength, energy level, scaling state, etc. of the homologous signal sent by the homologous signal trigger module, so that the signal reaches a basically stable state. At the same time, the homologous signal conditioning module can also set the trigger revelation time, and send the trigger start time and the homologous signal after preliminary adjustment to the terminal signal synchronization module through the synchronization path. Here, the homologous signal conditioning module can be implemented using an ultrasonic amplifier (Panametrics 5660C).

[0020] The front-end signal excitation module adjusts the waveform and state parameters of the homologous signal after preliminary adjustment to generate an excitation signal; this can be achieved by using a conventional signal modulator. The output excitation signal waveform (for example, a square wave, a ramp wave, a triangle wave, or a random wave, etc.) and state parameters (for example, duration, frequency, and / or gain, etc.) are set in advance, and then a corresponding excitation signal is generated based on the received homologous signal after preliminary adjustment.

[0021] The above-mentioned deep earth environment simulation chamber can adopt the conventional triaxial pressure chamber for simulating deep earth environment disclosed in the art, the difference is that it includes a receiving sensor group consisting of an excitation sensor and two or more receiving sensors; the excitation sensor is connected to the output end of the front-end signal excitation module; the receiving sensor group is connected to the back-end signal conditioning module. The excitation sensor is installed at one end of the sample load loading end in the deep earth environment simulation chamber, and can be set in the loading pad set at one end of the rock sample; in a preferred implementation, the excitation sensor is located at the center of the loading pad; when a seepage channel is set on the rock sample, the excitation sensor and the seepage channel can be staggered. The receiving sensor group is installed at the opposite end of the rock sample load loading end; it can be set in the loading pad set at the other end of the rock sample; in a preferred implementation, the receiving sensor group is located in the loading pad; two or more receiving sensors in the receiving sensor group are evenly arranged along the diameter of the loading pad or evenly arranged along the circumference of the loading pad.

[0022] The above-mentioned back-end signal conditioning module includes a signal acquisition board, a receiving signal amplification module and a receiving signal channel identification module. The signal acquisition board is connected to each receiving sensor and is used to send the signal sent by the receiving sensor to the receiving signal amplification module. The receiving signal amplification module is used to amplify the signal of the receiving sensor. Since the received signal is very weak after all, it cannot be subsequently transmitted without amplification and adjustment. The receiving signal channel identification module is used to determine the receiving channel and wave type corresponding to the receiving signal; when there are more than two receiving sensors, the signals received by different sensors may be longitudinal waves or transverse waves, and the layout positions of different receiving sensors are also different. The receiving signal channel identification module is used to identify and determine the receiving sensor. Since the layout position of the receiving sensor and the type of the received signal are pre-set, it can be achieved by setting the receiving channel corresponding to the receiving sensor. When the receiving sensor is determined, its corresponding signal type is also determined at the same time, and the receiving channel is also determined at the same time. In addition, the back-end signal conditioning module may also include a receiving signal time difference control module disposed between the signal acquisition board and the receiving signal amplification module. When the single excitation sensor corresponding to the front end is excited multiple times in succession, when there are multiple acquisition boards connected to the acquisition sensors at the receiving end, the time interval of signal transmission between the acquisition boards can be controlled by the receiving signal time difference control module. The back-end signal conditioning module also includes a signal transmission channel connected in parallel with the receiving signal channel identification module, and the branch where the receiving signal channel identification module is located is connected to the on-off controller. The on-off controller is used to select the receiving signal channel identification module and the signal transmission channel. When there is only one receiving sensor, there is no problem of identifying the receiving signal channel and category. The signal transmission channel can directly reach the terminal signal synchronization module to improve the signal processing efficiency.

[0023] The terminal signal synchronization module is used to synchronize the received signals of each channel with the homologous signal. The terminal signal synchronization module includes a signal collection module, a received signal starting point matching module, a homologous signal starting point matching module and a received signal and homologous signal synchronous output module. The signal collection module is used to collect received signals, homologous signals and trigger start time signals. The received signal starting point matching module is used to match the received signals of each channel with the trigger start time signal, thereby determining the starting time of the received signal. The homologous signal starting point matching module is used to match the homologous signal with the trigger start time signal, thereby determining the starting time of the homologous signal. The received signal and homologous signal synchronous output module is used to synchronously output the received signal and the homologous signal of the determined trigger start time.

[0024] The working conditions measured and controlled by the above-mentioned measurement and control module for simulating deep earth environment include temperature field, stress field (i.e., pressure environment), seepage field, etc. The measurement and control module for simulating deep earth environment includes a deep earth temperature field measurement and control module, a deep earth stress field triggering and synchronous receiving module, a deep earth seepage field measurement and control module, a specimen load measurement and control module, a specimen deformation state test module, and a deep earth measurement and control signal conversion and conditioning module.

[0025] The present invention further provides a method for synchronously testing rock mass longitudinal and transverse waves under homologous excitation suitable for deep ground conditions. The above-mentioned testing system can be used to perform the following steps:

[0026] Step 1: The display and storage module sends the signal trigger instruction and the signal trigger instruction from the operator to the comprehensive processing module; the comprehensive processing module sends the received signal trigger instruction to the homologous signal trigger module, and sends the deep earth environment simulation control instruction to the measurement and control module simulating the deep earth environment;

[0027] Step 2: The measurement and control module for simulating the deep earth environment controls the working conditions in the deep earth environment simulation cabin according to the received deep earth environment control instructions, and feeds back the monitoring data to the comprehensive processing module;

[0028] Step 3: The homologous signal trigger module generates an initial homologous signal according to the received signal trigger instruction; the homologous signal conditioning module performs preliminary adjustment on the homologous signal and then sends it to the front-end signal excitation module; at the same time, the determined starting time and the preliminarily adjusted homologous signal are sent to the terminal signal synchronization module through the synchronization path;

[0029] Step 4: The front-end signal excitation module adjusts the homologous signal waveform and state parameters after preliminary adjustment to generate an excitation signal, and sends the excitation signal to the excitation sensor in the deep earth environment simulation cabin; the receiving sensor sends the received signal to the back-end signal processing module;

[0030] Step 5: The back-end signal conditioning module adjusts the received signal and determines the received signal channel and received signal type;

[0031] Step 6: The terminal signal synchronization module performs synchronization processing on the received signals of each channel and the homologous signal, and feeds back the received signals of each channel and the homologous signal synchronously associated therewith to the comprehensive processing module after the synchronization processing;

[0032] Step 7: The comprehensive processing module summarizes the data fed back by the measurement and control module simulating the deep earth environment and the terminal signal synchronization module and returns it to the display and storage module for real-time display and storage.

[0033] The present invention provides a synchronous testing system and method for rock mass longitudinal and transverse waves of homologous excitation suitable for deep-earth conditions. An excitation sensor and a receiving sensor group are installed on the rock sample; the excitation sensor is installed at one end of the rock sample load loading end in the deep-earth environment simulation chamber, and the receiving sensor group is installed at the other end of the sample load loading end; the front end obtains the excitation signal of the input excitation sensor through the homologous signal trigger module, the homologous signal conditioning module and the front-end signal excitation module, and the back end distinguishes the channel and performs synchronous processing on the received signal through the back-end signal conditioning module and the terminal signal synchronization module to obtain a synchronized received signal and homologous signal, and displays them in real time through the display and storage module; at the same time, the deep-earth environment where the sample is located is simulated through the measurement and control module that simulates the deep-earth environment. The present invention has the following beneficial effects:

[0034] (1) The present invention can realize synchronous testing of different types of signals in a complex deep underground environment by deploying a variety of signal conditioning modules;

[0035] (2) The present invention can realize synchronous testing of longitudinal waves and shear waves, thereby ensuring the authenticity of the received signal and avoiding misleading analysis results;

[0036] (3) The simulation of deep-earth environment measurement and control is integrated with elastic wave (P and S wave) testing, which makes post-processing simple and time-saving. It also avoids the problem of unreliable analysis results caused by the time difference between the two test units. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work, or other related drawings represented by approximate physical forms.

[0038] Figure 1Schematic diagram of the framework of the synchronous testing system for rock mass longitudinal and transverse waves excited by the same source suitable for deep underground conditions.

[0039] Figure 2 This is a schematic diagram of the structure of the deep earth environment simulation chamber.

[0040] Figure 3 Schematic diagram of the arrangement of the excitation sensor and the receiving sensor on the first sample provided; (a) is a cross-sectional view from the main viewing angle, (b) is a cross-sectional view from the top viewing angle, and (c) is a cross-sectional view from the top viewing angle.

[0041] Figure 4 Schematic diagram of the arrangement of excitation sensors and receiving sensors on the second sample provided.

[0042] Figure 5 Schematic diagram of the arrangement of excitation sensors and receiving sensors on the third sample provided. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0045] Example 1

[0046] With respect to the above-mentioned deep earth environment simulation chamber 6, the present embodiment provides a synchronous testing system for rock mass longitudinal and transverse waves for deep earth adjustment, such as Figure 1 As shown, it includes a display and storage module 1, a comprehensive processing module 2, a homologous signal trigger module 3, a homologous signal conditioning module 4, a front-end signal excitation module 5, a back-end signal conditioning module 7, a terminal signal synchronization module 8 and a measurement and control module 10 for simulating a deep earth environment.

[0047] The following is a detailed explanation of each component.

[0048] (I) Display and storage module

[0049] The display and storage module 1 is used to display and store the rock mass longitudinal wave and transverse wave data collected under different deep earth environment simulation conditions. Based on the data transmitted by the comprehensive processing module, the rock mass longitudinal wave and transverse wave data collected under different deep earth environment simulation conditions and the data related to the loading control and measurement result monitoring of the rock sample stress deformation in the deep earth environment simulation chamber are displayed and stored; this can be achieved by using a conventional computer, notebook, tablet, etc. equipped with a display function in the field.

[0050] (II) Comprehensive processing module

[0051] The comprehensive processing module 2 is mainly used for data conversion and instruction sending. It is used to send the received signal trigger instruction to the homologous signal trigger module 3, and send the deep earth environment simulation control instruction to the measurement and control module 10 that simulates the deep earth environment; at the same time, the data returned by the terminal signal synchronization module 8 and the measurement and control module 10 that simulates the deep earth environment are summarized. The comprehensive processing module generates signal trigger control instructions and deep earth environment simulation condition control instructions based on the operation request from the operator, and can be executed according to timing control. The comprehensive processing module can also perform digital-to-analog signal conversion, which is used to convert the control instruction into a corresponding electrical signal or convert the corresponding electrical signal into a digital signal. The comprehensive processing module can be implemented by a conventional controller, such as a programmable logic controller (PLC).

[0052] (III) Homologous signal trigger module

[0053] The homologous signal trigger module 3 is used to generate a homologous signal that can continue to transmit instructions to the subsequent according to the signal trigger instruction sent by the comprehensive processing module. Here, the homologous signal trigger module can be implemented by a high-voltage ultrasonic pulse signal transmitter (DPR300).

[0054] (IV) Homologous signal conditioning module

[0055] The homologous signal conditioning module 4 is used to perform preliminary and rough adjustment and control of the signal strength, energy level, scaling state, etc. of the homologous signal sent by the homologous signal trigger module, so that the signal reaches a basically stable state. It is used to perform preliminary adjustment on the homologous signal and then send it to the front-end signal excitation module; the homologous signal conditioning module can also set the trigger revelation time, and send the determined starting time and the homologous signal after preliminary adjustment to the terminal signal synchronization module 8 through the synchronization path 9. Here, the homologous signal conditioning module can be implemented using an ultrasonic amplifier (Panametrics 5660C).

[0056] (V) Front-end signal excitation module

[0057] The front-end signal excitation module 5 adjusts the homologous signal waveform and state parameters after preliminary adjustment to generate an excitation signal, and sends the excitation signal to the excitation sensor in the deep earth environment simulation chamber. The front-end signal excitation module 5 can be implemented by a conventional signal modulator. The output excitation signal waveform (such as square wave, ramp wave, triangle wave, random wave, etc.) and state parameters (such as duration, frequency, gain, etc.) are set in advance, and then the corresponding excitation signal is generated according to the homologous signal after preliminary adjustment received.

[0058] (VI) Deep Earth Environment Simulation Chamber

[0059] The deep earth environment simulation chamber 6 is used to simulate the deep earth environment.

[0060] The synchronous testing system for rock mass longitudinal and transverse waves of homologous excitation suitable for deep earth adjustment provided in this embodiment is targeted at the deep earth environment simulation chamber 6, such as Figure 2 As shown, it includes a triaxial pressure chamber A-10 for simulating deep earth environment installed on a base A-13, a specimen assembly installed on a triaxial seepage bearing chassis A-12 in the triaxial pressure chamber A-10, and a load application column A-11 loaded on the specimen assembly. The specimen assembly includes a rock sample A-9, and the upper and lower ends of the rock sample A-9 are respectively installed between the load application column A-11 and the triaxial seepage bearing chassis A-12 through an upper loading pad A-3 and a lower loading pad A-4; the upper loading pad A-3 and the lower loading pad A-4 are U-shaped structures, and a loading pad cover A-2 is provided at the open end, and the two are connected by a connecting bolt A-1. The first seepage channel A-7 and the second seepage channel A-8 are respectively opened and installed in the middle position of the upper loading pad A-3 and the lower loading pad A-4. A confining pressure medium inlet and outlet pipe A-14 is installed on the base A-13. In order to simulate the test of longitudinal and transverse waves in the sample under the deep earth environment, a receiving sensor group consisting of an excitation sensor A-5 and two or more receiving sensors A-6 is installed on the rock sample in the deep earth environment simulation chamber; the excitation sensor A-5 is installed at the load loading end of the rock sample in the deep earth environment simulation chamber, and the two or more receiving sensors A-6 are installed at the opposite end of the load loading end of the rock sample. The wave type of the excitation sensor is compression wave; the wave types received by the receiving sensor group include longitudinal wave (compression wave) and transverse wave (shear wave). Both the excitation sensor and the receiving sensor are ultrasonic sensors.

[0061] The arrangement of the excitation sensor A-5 and the receiving sensor A-6 can be arranged in a variety of ways according to specific circumstances:

[0062] (1) When the sample is provided with a first seepage channel, the excitation sensor and the first seepage channel may be arranged in a staggered manner; when the sample is not provided with a first seepage channel, the excitation sensor is arranged at the center of the upper loading pad;

[0063] (2) Two or more receiving sensors are arranged in the lower loading pad; two or more receiving sensors are evenly arranged along the diameter of the loading pad or evenly arranged along the circumference of the loading pad; when a second seepage channel is provided on the sample, one of the receiving sensors can be arranged offset from the second seepage channel; when a second seepage channel is not provided on the sample, one of the receiving sensors can be arranged at the center of the lower loading pad. The positions of different types of receiving sensors can be staggered one by one, in order to facilitate the use of homologous dual waves (i.e., longitudinal waves and transverse waves) to monitor the state of the rock mass in real time under deep underground conditions. This is because rock is not an ideal homogeneous body after all, and anisotropy must exist. Therefore, using alternating longitudinal and transverse wave receiving sensors can ensure that the test results are more in line with reality.

[0064] Example 1, Figure 3 An arrangement of an excitation sensor and three receiving sensors is provided, wherein the excitation sensor A-5 is installed at the middle of the bottom of the U-shaped structure of the upper loading pad and deviates from the position of the first seepage channel; the three receiving sensors A-6 are radially arranged along the lower loading pad and installed at the bottom of the U-shaped structure of the lower loading pad, and the middle receiving sensor is deviated from the position of the second seepage channel.

[0065] Example 2, Figure 4 An arrangement of an excitation sensor and five receiving sensors is provided, where the excitation sensor A-5 is connected to Figure 3 The arrangement mode is the same, four receiving sensors are evenly arranged along the circumference of the lower loading pad, and another receiving sensor is located in the middle of the lower loading pad, deviating from the second seepage channel.

[0066] Example 3, Figure 5 An arrangement of an excitation sensor and eight receiving sensors is provided, with the excitation sensor A-5 and Figure 3 The arrangement is the same, with eight receiving sensors evenly arranged along the circumference of the lower loading pad.

[0067] (VII) Back-end signal conditioning signal

[0068] The back-end signal conditioning module 7 is used to condition the received signal and determine the received signal channel and the received signal type.

[0069] The back-end signal conditioning module 7 includes a signal acquisition board, a received signal time difference control module 7-1, a received signal amplification module 7-2 and a received signal channel identification module 7-3.

[0070] The signal acquisition board is connected to each receiving sensor and is used to send the signal sent by the receiving sensor to the receiving signal amplification module. When the single excitation sensor corresponding to the front end is excited multiple times in succession, and there are multiple acquisition boards connected to the acquisition sensors at the receiving end, the time interval of signal transmission between the acquisition boards can be controlled by the receiving signal time difference control module. The receiving signal time difference control module can be implemented using Model DI-1100.

[0071] The receiving signal amplification module is used to amplify the signal of the receiving sensor. Since the received signal is very weak after all, it cannot be subsequently transmitted without amplification and adjustment. The receiving signal amplification module includes a preset number of receiving signal amplification units, which can be implemented using AE2A / AE5A-WIDE BANDWIDTH AE AMPLIFIER.

[0072] The receiving signal channel identification module is used to determine the receiving channel and wave type corresponding to the receiving signal. When there are more than two receiving sensors, the signals received by different sensors may be longitudinal waves or transverse waves, and the layout positions of different receiving sensors are also different. The receiving signal channel identification module is used to identify and determine the receiving sensor. Since the layout position of the receiving sensor and the type of the received signal are pre-set, the receiving signal channel identification module can be implemented by setting the receiving channel corresponding to the receiving sensor. When the receiving sensor is determined, the corresponding signal type is also determined at the same time, and the receiving channel is also determined. The receiving signal amplification unit is arranged before each receiving channel in the receiving signal channel identification module.

[0073] The back-end signal conditioning module also includes a signal transmission channel connected in parallel with the receiving signal channel identification module, and the branch where the receiving signal channel identification module is located is connected to the on-off controller 7-4. The on-off controller is used to select the receiving signal channel identification module and the signal transmission channel. When there is only one receiving sensor, there is no problem of identifying the receiving signal channel and category. The signal can be directly transmitted from the signal transmission channel to the terminal signal synchronization module to improve the signal processing efficiency. The channel controller 7-4 can be implemented by a conventional selection switch. At the same time, a receiving signal amplification unit for amplifying and adjusting the signal is also provided on the signal transmission channel.

[0074] (VIII) Terminal signal synchronization module

[0075] The terminal signal synchronization module 8 is used to perform synchronization processing on the received signals of each channel and the homologous signal, and feed back the received signals of each channel and the homologous signal synchronously associated therewith to the comprehensive processing module 2 after the synchronization processing;

[0076] The terminal signal synchronization module 8 includes a signal collection module 8-1, a received signal starting point matching module 8-2, a homologous signal starting point matching module 8-3 and a received signal and homologous signal synchronization output module 8-4.

[0077] The signal collection module 8-1 is used to collect received signals, homologous signals and trigger start time signals.

[0078] The received signal starting point matching module 8 - 2 is used to match the received signal with the trigger starting time signal, so as to determine the starting time of the received signal.

[0079] The homologous signal starting point matching module 8 - 3 is used to match the homologous signal with the trigger starting time signal, so as to determine the starting time of the homologous signal.

[0080] The receiving signal and homologous signal synchronous output module 8-4 is used to synchronously output the receiving signal and the homologous signal that determine the trigger start time. Here, the starting time of the receiving signal is matched with the starting time of the homologous signal, so as to determine the real starting time of the receiving signal after the homologous signal is excited, and the time and the corresponding homologous signal and receiving signal data are synchronously output to the comprehensive processing module 2.

[0081] The above-mentioned signal collection module 8-1, received signal starting point matching module 8-2, homologous signal starting point matching module 8-3 and received signal and homologous signal synchronous output module 8-4 can be implemented by the system signal synchronization control chip SmartFusion2SoC FPGAs.

[0082] 9. Measurement and control module for simulating deep earth environment

[0083] The measurement and control module 10 for simulating the deep earth environment is used to control the working conditions in the deep earth environment simulation cabin according to the received deep earth environment control instructions, and feed back the monitoring data to the comprehensive processing module 2.

[0084] The working conditions measured and controlled by the measurement and control module simulating the deep earth environment include temperature field, stress field (i.e., pressure environment), seepage field, etc. The measurement and control module 10 simulating the deep earth environment includes a deep earth temperature field measurement and control module 10-1, a deep earth stress field triggering and synchronous receiving module 10-2, a deep earth seepage length measurement and control module 10-3, a specimen load measurement and control module 10-4, a specimen deformation state test module 10-5, and a deep earth measurement and control signal conversion and conditioning module 10-6.

[0085] The above-mentioned deep earth temperature field measurement and control module 10-1 is mainly composed of a heating device and a temperature sensor installed in the three-axis pressure chamber A-10 simulating the deep earth environment. The heating processing device controls the temperature in the three-axis pressure chamber A-10 simulating the deep earth environment through the heating device according to the temperature control instruction, and measures the temperature in the three-axis pressure chamber A-10 simulating the deep earth environment in real time through the temperature sensor, and then feeds back to the comprehensive processing module 2 through the deep earth measurement and control signal conversion and conditioning module 10-6.

[0086] The above-mentioned deep ground stress field triggering and synchronous receiving module 10-2 mainly controls the pressure state in the triaxial pressure chamber A-10 by controlling the confining pressure medium inlet and outlet pipe A-14 to pass the confining pressure medium into the triaxial pressure chamber A-10, applies a predetermined confining pressure to the sample, and simultaneously measures the confining pressure. The deep ground stress field triggering and synchronous receiving module 10-2 can realize the confining pressure control and measurement by using the triaxial pressure chamber and the confining pressure cabinet module MTS286.31 for loading and measuring the confining pressure on the MTS815 rock mechanics testing machine, and then feeds back to the comprehensive processing module 2 through the deep ground measurement and control signal conversion and conditioning module 10-6.

[0087] The above-mentioned deep seepage measurement and control module 10-3 controls the seepage pressure or flow rate of the first seepage channel A-7 and the second seepage channel A-8, measures the attenuation of the seepage pressure difference through the two ends of the sample or the flow value through the sample, and then feeds back to the comprehensive processing module 2 through the deep measurement and control signal conversion and conditioning module 10-6. The seepage module can be implemented using the seepage control cabinet module MTS286.20 that is equipped on the MTS815 rock mechanics testing machine.

[0088] The above-mentioned specimen is subjected to a load measurement and control module 10-4, which applies a predetermined axial load to the specimen through a load application column A-11, and controls and measures the load through a load sensor.

[0089] The specimen deformation state testing module 10 - 5 controls and measures deformation through a deformation measuring extensometer (eg, MTS632.92H-03) installed on the side of the sample.

[0090] Then, the signals of rock loading control and measurement in deep underground environment are fed back to the comprehensive processing module 2 through the conversion and conditioning module 10-6.

[0091] The deep earth measurement and control signal conversion and conditioning module 10-6 is used to generate control signals for the deep earth temperature field measurement and control module 10-1, the deep earth stress field trigger and contact synchronization measurement and control module 10-2, the deep earth seepage length measurement and control module 10-3, and the specimen load measurement and control module 10-4 from the instructions from the comprehensive processing module, and to perform data feedback processing on the feedback data from the deep earth temperature field measurement and control module 10-1, the deep earth stress field trigger and contact synchronization measurement and control module 10-2, the deep earth seepage measurement and control module 10-3 (MTS286.20) and the deformation state test module 10-5 (MTS632.92H-03), and feed it back to the comprehensive processing module 2. The deep earth measurement and control signal conversion and conditioning module 10-6 can be implemented by MTS Flextest 60.

[0092] This embodiment also provides the use of the above test system to perform synchronous testing of longitudinal and transverse waves of rock mass excited by the same source in a deep earth simulation environment, which is performed according to the following steps:

[0093] Step 1: The display and storage module 1 sends the signal trigger instruction and the signal trigger instruction from the operator to the comprehensive processing module 2; the comprehensive processing module 2 sends the received signal trigger instruction to the homologous signal trigger module 3, and sends the deep earth environment simulation control instruction to the measurement and control module 10 simulating the deep earth environment.

[0094] Step 2: The measurement and control module 10 for simulating the deep earth environment controls the working conditions in the deep earth environment simulation cabin according to the received deep earth environment control instructions, and feeds back the monitoring data to the comprehensive processing module 2.

[0095] The measurement and control module 10 simulating the deep earth environment is converted and conditioned by the deep earth measurement and control signal conversion and conditioning module 10-6, so as to realize the measurement and control of temperature field, stress field, seepage field, load loading, deformation, etc., and then synchronously obtain the stress state and deformation information of the rock specimen corresponding to the change of the wave that needs to be tested during the change of the rock specimen under the complex conditions in the deep earth.

[0096] Step three: The homologous signal trigger module 3 generates an initial homologous signal according to the received signal trigger instruction; the homologous signal conditioning module 4 performs preliminary adjustment on the homologous signal and then sends it to the front-end signal excitation module; at the same time, the determined starting time and the preliminarily adjusted homologous signal are sent to the terminal signal synchronization module 8 through the synchronization path 9.

[0097] Step 4: The front-end signal excitation module 5 adjusts the homologous signal waveform and state parameters after preliminary adjustment to generate an excitation signal, and sends the excitation signal to the excitation sensor in the deep earth environment simulation cabin; the receiving sensor sends the received signal to the back-end signal processing module 7.

[0098] The front-end signal excitation module 5 can be implemented by a conventional signal modulator. The output excitation signal waveform (such as square wave, ramp wave, triangle wave, random wave, etc.) and state parameters (such as duration, frequency, gain, etc.) are set in advance, and then the corresponding excitation signal is generated according to the homologous signal after the initial adjustment. The excitation signal is input to the excitation sensor on the test sample installed in the deep earth environment simulation cabin 6, and the information sent by the excitation sensor is then received by the receiving sensor, and then transmitted to the back-end conditioning module 7.

[0099] Step 5: The back-end signal conditioning module 7 conditions the received signal and determines the received signal channel and the received signal type.

[0100] When the on-off controller 7-4 is turned off, it means that only one receiving sensor installed at the sample receiving end is allowed to record the same type of wave information. There is no need to classify the received waves. It can be directly transmitted to the receiving signal amplification module 7-2 through the signal transmission channel. After amplification according to the set gain, it is directly sent to the terminal signal synchronization module.

[0101] When the on-off controller 7-4 is turned on, it means that there are more than two receiving sensors installed at the sample receiving end, and the recorded wave information has different categories, and the channels need to be classified by type. The function of the receiving signal time difference control module 7-1 is to set the time interval between each acquisition control board when the single excitation sensor corresponding to the front end is excited multiple times in succession and the multi-channel receiving acquisition boards connected to the back end need to switch with each other. Then the receiving signal transmitted through 7-1 is transmitted to the receiving signal amplification module 7-2, and the receiving signal amplification module 7-2 amplifies the signals obtained by each receiving sensor installed at the receiving end of the test sample according to the set gain. Thereafter, the receiving signal channel identification module 7-3 will perform channel identification, and then the receiving signal is transmitted to the terminal signal synchronization module 8-1 through the identified receiving channel.

[0102] Step 6: The terminal signal synchronization module 8 performs synchronization processing on the received signals of each channel and the homologous signal, and feeds back the received signals of each channel and the homologous signal synchronously associated therewith to the comprehensive processing module 2 after the synchronization processing.

[0103] After the received signal is transmitted to the signal collection module 8-1, the received signal and the trigger start time signal are transmitted to the received signal starting point matching module 8-2 to determine the starting time of the received signal, and the homologous signal and the trigger start time signal are transmitted to the homologous signal starting point matching module 8-3 to determine the starting time of the homologous signal. Then, the received signal and the homologous signal with the determined trigger start time are transmitted to the comprehensive processing module 2 via the received signal and homologous signal synchronous output module.

[0104] The comprehensive processing module 2 saves the acoustic wave data (homologous signal and receiving signal) and the rock deformation and mechanical data in the simulated deep earth environment in the same time-related data file, thereby realizing the integration of simulated deep earth environment measurement and control with elastic wave (longitudinal wave and transverse wave) testing, providing effective data support for mechanical analysis or loss distribution state analysis, and avoiding the problem of unreliable analysis results caused by the time difference between the two test units.

[0105] Step 7: The comprehensive processing module 2 summarizes the data fed back by the measurement and control module 10 and the terminal signal synchronization module 8 for simulating the deep earth environment and returns them to the display and storage module 1 for real-time display and storage.

[0106] The display and storage module 1 can display different deep working conditions and transverse wave or longitudinal wave data at different positions of the sample receiving end collected under the corresponding working conditions in real time. It can also obtain the corresponding mechanical parameter change images, damage distribution state change images, etc. that need to be displayed according to the wave change information.

[0107] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A synchronous testing system for rock mass longitudinal and transverse waves excited by the same source suitable for deep ground conditions, characterized in that: include: A display and storage module (1) is used to display and store rock mass longitudinal wave and transverse wave data collected under different deep earth environment simulation conditions; The comprehensive processing module (2) is used to send the received signal trigger instruction to the homologous signal trigger module (3), and send the deep earth environment simulation control and loading control instructions to the measurement and control module (10) for simulating the deep earth environment; and at the same time, summarize the data returned by the terminal signal synchronization module (8) and the measurement and control module (10) for simulating the deep earth environment; A homologous signal trigger module (3), used to generate an initial homologous signal according to a received signal trigger instruction; The homologous signal conditioning module (4) is used to perform preliminary conditioning on the homologous signal and then send it to the front-end signal excitation module; at the same time, the determined starting time and the homologous signal after preliminary conditioning are sent to the terminal signal synchronization module (8) through the synchronization path (9); The front-end signal excitation module (5) adjusts the waveform and state parameters of the homologous signal after preliminary adjustment to generate an excitation signal, and sends the excitation signal to the deep earth environment simulation cabin; A deep earth environment simulation chamber (6) is used to simulate the deep earth environment and perform loading and measurement control; an excitation sensor and two or more receiving sensors are installed on the rock mass sample in the deep earth environment simulation chamber; the excitation sensor is installed at one end of the rock mass sample in the deep earth environment simulation chamber where the load is applied, and a receiving sensor group consisting of two or more receiving sensors is installed at the opposite end of the rock mass sample where the load is applied; the wave types received by the receiving sensor group include longitudinal waves and transverse waves; A back-end signal conditioning module (7), used for conditioning the received signal and determining the received signal channel and the received signal type; The terminal signal synchronization module (8) is used to perform synchronization processing on the received signals of each channel and the homologous signal, and feed back the received signals of each channel and the homologous signal synchronized therewith to the comprehensive processing module (2) after the synchronization processing; The deep earth environment simulation measurement and control module (10) is used to measure and control the working conditions in the deep earth environment simulation cabin according to the received deep earth environment measurement and control instructions, and feed back the monitoring data to the comprehensive processing module (2).

2. The synchronous testing system for rock mass longitudinal and transverse waves excited by homologous sources suitable for deep underground conditions according to claim 1 is characterized in that: The excitation signal waveform is a square wave, a ramp wave, a triangle wave or a random wave, and the state parameter is duration, frequency and / or gain.

3. The synchronous testing system for rock mass longitudinal and transverse waves excited by the same source and suitable for deep ground conditions according to claim 1 is characterized in that: The excitation sensor is connected to the output end of the front-end signal excitation module; the receiving sensor is connected to the back-end signal conditioning module; the excitation sensor is arranged in a loading pad arranged at one end of the rock sample; and the receiving sensor group is arranged in a loading pad arranged at the other end of the rock sample.

4. The synchronous testing system for rock mass longitudinal and transverse waves excited by the same source and suitable for deep ground conditions according to claim 1 is characterized in that: Two or more receiving sensors in the receiving sensor group are evenly arranged along the diameter of the loading pad or evenly arranged along the circumference of the loading pad.

5. The synchronous testing system for rock mass longitudinal and transverse waves excited by the same source and applicable to deep ground conditions according to claim 1 is characterized in that: The back-end signal conditioning module comprises a signal acquisition board, a receiving signal amplifying module (7-2) and a receiving signal channel identification module (7-3); the signal acquisition board is connected to each receiving sensor and is used to send the signal sent by the receiving sensor to the receiving signal amplifying module; the receiving signal amplifying module is used to amplify the signal of the receiving sensor; the receiving signal channel identification module is used to determine the receiving channel and wave type corresponding to the receiving signal.

6. The synchronous testing system for rock mass longitudinal and transverse waves excited by the same source and applicable to deep ground conditions according to claim 5 is characterized in that: When there are multiple signal acquisition boards, the back-end signal conditioning module may further include a receiving signal time difference control module (7-1) disposed between the signal acquisition board and the receiving signal amplification module, and the time interval of signal transmission between each acquisition board is controlled by the receiving signal time difference control module.

7. The synchronous testing system for rock mass longitudinal and transverse waves excited by the same source and applicable to deep ground conditions according to claim 5 or 6, characterized in that: The back-end signal conditioning module also includes a signal transmission channel connected in parallel with the receiving signal channel identification module, and the branch where the receiving signal channel identification module is located is connected to the on-off controller (7-4).

8. The synchronous testing system for rock mass longitudinal and transverse waves excited by homologous sources suitable for deep underground conditions according to claim 1 is characterized in that: The terminal signal synchronization module comprises a signal collection module (8-1), a received signal starting point matching module (8-2), a homologous signal starting point matching module (8-3) and a received signal and homologous signal synchronous output module (8-4); the signal collection module is used to collect received signals, homologous signals and trigger start time signals; the received signal starting point matching module is used to match the received signals of each channel with the trigger start time signal, so as to determine the start time of the received signal; the homologous signal starting point matching module is used to match the homologous signal with the trigger start time signal, so as to determine the start time of the homologous signal; the received signal and homologous signal synchronous output module is used to synchronously output the received signal and the homologous signal of the determined trigger start time.

9. The synchronous testing system for rock mass longitudinal and transverse waves excited by the same source and applicable to deep ground conditions according to claim 1 is characterized in that: The measurement and control module for simulating a deep earth environment comprises a deep earth temperature field measurement and control module (10-1), a deep earth stress field triggering and synchronous receiving module (10-2), a deep earth seepage length measurement and control module (10-3), a specimen load measurement and control module (10-4), a specimen deformation state testing module (10-5) and a deep earth measurement and control signal conversion and conditioning module (10-6).

10. A synchronous testing method for rock mass longitudinal and transverse waves excited by the same source suitable for deep ground conditions, characterized in that Using the test system according to any one of claims 1 to 9, perform the following steps: Step 1: the display and storage module (1) sends the signal trigger instruction and the signal trigger instruction from the operator to the comprehensive processing module; the comprehensive processing module (2) sends the received signal trigger instruction to the homologous signal trigger module (3), and sends the deep earth environment simulation control instruction to the measurement and control module (10) for simulating the deep earth environment; Step 2: The measurement and control module (10) for simulating the deep earth environment controls the working conditions in the deep earth environment simulation cabin according to the received deep earth environment control instructions, and feeds back the monitoring data to the comprehensive processing module (2); Step 3: The homologous signal trigger module (3) generates an initial homologous signal according to the received signal trigger instruction; the homologous signal conditioning module (4) performs preliminary adjustment on the homologous signal and then sends it to the front-end signal excitation module; at the same time, the determined starting time and the homologous signal after preliminary adjustment are sent to the terminal signal synchronization module (8) through the synchronization path (9); Step 4: The front-end signal excitation module (5) adjusts the homologous signal waveform and state parameters after preliminary adjustment to generate an excitation signal, and sends the excitation signal to the excitation sensor in the deep earth environment simulation cabin; the receiving sensor sends the received signal to the back-end signal processing module (7); Step 5: The back-end signal conditioning module (7) conditions the received signal and determines the received signal channel and received signal type; Step 6: The terminal signal synchronization module (8) performs synchronization processing on the received signals of each channel and the homologous signal, and feeds back the received signals of each channel and the homologous signal synchronously associated therewith to the comprehensive processing module (2); Step 7: The comprehensive processing module (2) aggregates the data fed back by the measurement and control module (10) simulating the deep earth environment and the terminal signal synchronization module (8) and returns the data to the display and storage module (1) for real-time display and storage.

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