Tunnel geological detection system and method, storage medium and program product

Abstract

The invention provides a tunnel geological detection system and method, a storage medium and a computer program product. The system comprises a current source, an emission electrode, a shielding electrode, a backflow electrode, a differential pressure signal measurement module and an acquisition control module. The acquisition control module controls the current source to output current to the emission electrode in a first working mode and controls the current source to output current to the shielding electrode in a second working mode according to the electric field synthesis proportional parameters, so that the emission electrode emits current to a target stratum under the action of electric field superposition, the resistivity determination module is used for determining apparent resistivity corresponding to a target stratum; wherein under the condition that the emission electrode emits the current to the target stratum, the voltage difference information is smaller than the voltage difference threshold value. According to the invention, the measurement precision of the apparent resistivity can be improved, and an accurate geological forecast result is provided; moreover, related hardware circuits do not need to be installed, the tunnel excavation equipment has the tunnel geological detection function, implementation is easy and convenient, and the cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel geological prediction, and in particular to a tunnel geological detection system, method, storage medium and computer program product. Background Art

[0002] The BEAM (Bore-Tunneling Electrical Ahead Monitoring) technology is a technology that uses electrical methods for tunnel advance geological prediction. When using the BEAM technology, a shielding current is emitted into the shielding electrode and a measuring current is emitted to the measuring electrode, so that the measuring current is focused into the rock mass to be detected. By analyzing the changes in the rock mass resistivity parameters, the integrity and water content of the rock mass in front of the face are predicted. When using the BEAM technology, when focusing the emission current, the hardware circuit negative feedback method is usually used to make the emission electrode and the shielding electrode meet the focusing conditions; because the hardware circuit gain is a finite value, under this hardware circuit negative feedback method, there must be a residual potential difference between the emission electrode and the shielding electrode, which will reduce the accuracy of the measured apparent resistivity; and in order to implement the BEAM function in the tunnel excavation equipment, it is necessary to pre-install the relevant hardware circuit for negative feedback on the tunnel excavation equipment before the tunnel excavation equipment leaves the factory, which is difficult to implement; for the tunnel excavation equipment that has been put into use, it is also necessary to install the relevant hardware circuit for negative feedback, which is more difficult to implement and has high implementation costs. Summary of the invention

[0003] The present disclosure provides a tunnel geological detection system, method, storage medium and computer program product.

[0004] According to a first aspect of the present disclosure, a tunnel geological detection system is provided, comprising: a current source, a transmitting electrode, a shielding electrode, a return electrode, a differential pressure signal measuring module and an acquisition control module; the detection circuit corresponding to the first working mode comprises the transmitting electrode and the return electrode, and the detection circuit corresponding to the second working mode comprises the shielding electrode and the return electrode; the differential pressure signal measuring module is used to detect the voltage difference between the transmitting electrode and the shielding electrode, and determine the voltage differential pressure information according to the voltage difference; the acquisition control module is used to determine the electric field synthesis ratio parameter; according to the electric field synthesis ratio parameter, the current source is controlled to output current to the transmitting electrode in the first working mode, and the current source is controlled to output current to the shielding electrode in the second working mode, so that the transmitting electrode transmits current to the target formation under the action of electric field superposition, so as to determine the apparent resistivity corresponding to the target formation; wherein, when the transmitting electrode transmits current to the target formation, the voltage differential pressure information is less than the differential pressure threshold.

[0005] Optionally, the acquisition control module is used to obtain the first voltage difference information determined by the pressure difference signal measurement module when the current source is controlled to output current to the transmitting electrode in the first operating mode; to obtain the second voltage difference information determined by the pressure difference signal measurement module when the current source is controlled to output current to the shielding electrode in the second operating mode; and to determine the electric field synthesis ratio parameter based on the first voltage difference information and the second voltage difference information.

[0006] Optionally, the acquisition control module is used to calculate the ratio of the first voltage difference information to the second voltage difference information, and determine the electric field synthesis ratio parameter based on the ratio.

[0007] Optionally, the system includes a reference electrode; the acquisition control module is used to detect a first voltage of the transmitting electrode relative to the reference electrode and a first shunt current flowing into the target formation in the first working mode; detect a second voltage of the transmitting electrode relative to the reference electrode and a second shunt current flowing into the transmitting electrode in the second working mode; and determine the apparent resistivity based on the electrode coefficient, the first voltage, the second voltage, the first shunt current, the second shunt and the ratio.

[0008] Optionally, the transmitting electrode comprises a cutterhead of the tunnel excavation equipment; the shielding electrode comprises a shield of the tunnel excavation equipment; the return electrode comprises a first anchor inserted into the formation; and the reference electrode comprises a second anchor inserted into the formation.

[0009] Optionally, the pressure difference signal measurement module includes multiple amplification circuits and addition circuits; the amplification circuit is used to detect and amplify the pressure difference signal between the transmitting electrode and the shielding electrode; the addition circuit is used to add the pressure difference signals output by each of the amplification circuits to generate the voltage difference information.

[0010] Optionally, the current output by the current source to the transmitting electrode in the first working mode includes: a current with a first frequency; the current output by the current source to the shielding electrode in the second working mode includes: a current with a second frequency.

[0011] According to a second aspect of the present disclosure, a tunnel geological detection method is provided, which is applied to a tunnel geological detection system, wherein the tunnel geological detection system comprises a current source, a transmitting electrode, a shielding electrode, a return electrode, a differential pressure signal measurement module and an acquisition control module; the detection circuit corresponding to the first working mode comprises the transmitting electrode and the return electrode, and the detection circuit corresponding to the second working mode comprises the shielding electrode and the return electrode; the differential pressure signal measurement module is used to detect the voltage difference between the transmitting electrode and the shielding electrode, and determine the voltage differential pressure information according to the voltage difference; wherein the tunnel geological detection method is executed in the acquisition control module, and comprises: determining an electric field synthesis ratio parameter; according to the electric field synthesis ratio parameter, controlling the current source to output current to the transmitting electrode in the first working mode, and controlling the current source to output current to the shielding electrode in the second working mode, so that the transmitting electrode transmits current to the target formation under the action of electric field superposition; wherein, when the transmitting electrode transmits current to the target formation, the voltage differential pressure information is less than the differential pressure threshold; and determining the apparent resistivity corresponding to the target formation.

[0012] Optionally, determining the electric field synthesis ratio parameter includes: when controlling the current source to output current to the transmitting electrode in the first operating mode, obtaining first voltage difference information determined by the voltage difference signal measurement module; when controlling the current source to output current to the shielding electrode in the second operating mode, obtaining second voltage difference information determined by the voltage difference signal measurement module; and determining the electric field synthesis ratio parameter based on the first voltage difference information and the second voltage difference information.

[0013] Optionally, determining the electric field synthesis ratio parameter based on the first voltage difference information and the second voltage difference information includes: calculating a ratio of the first voltage difference information to the second voltage difference information; and determining the electric field synthesis ratio parameter based on the ratio.

[0014] Optionally, the tunnel geological detection system includes a reference electrode; the determination of the apparent resistivity corresponding to the target formation includes: detecting a first voltage of the transmitting electrode relative to the reference electrode and a first shunt current flowing into the target formation in the first operating mode; detecting a second voltage of the transmitting electrode relative to the reference electrode and a second shunt current flowing into the transmitting electrode in the second operating mode; and determining the apparent resistivity based on the electrode coefficient, the first voltage, the second voltage, the first shunt current, the second shunt current and the ratio.

[0015] Optionally, the current output by the current source to the transmitting electrode in the first working mode includes: a current with a first frequency; the current output by the current source to the shielding electrode in the second working mode includes: a current with a second frequency.

[0016] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the instructions are executed by a processor to perform the method as described above.

[0017] According to a fourth aspect of the present disclosure, a computer program product is provided, wherein the computer program product stores computer instructions, and the instructions are executed by a processor to perform the method as described above. 。

[0018] The tunnel geological detection system, method, storage medium and computer program product disclosed in the present invention use software focusing technology to transform two current fields in non-focused states into focused current fields, which can avoid the potential difference between the transmitting electrode and the shielding electrode, improve the measurement accuracy of the apparent resistivity, and provide accurate geological prediction results; moreover, the tunnel excavation equipment can have the tunnel geological detection function without installing related hardware circuits, which is easy to implement and can reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present disclosure will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. The above and other purposes and advantages of the present disclosure will be further described below in conjunction with specific embodiments and with reference to the accompanying drawings. In the accompanying drawings, the same or corresponding technical features or components will be represented by the same or corresponding figure marks.

[0020] Figure 1 Schematic diagram of modules of some embodiments of the tunnel geological detection system according to the present disclosure;

[0021] Figure 2 A schematic diagram of a control current source in some embodiments of the tunnel geological detection system disclosed herein outputting current to an emission electrode in a first working mode;

[0022] Figure 3 A schematic diagram of a control current source in some embodiments of the tunnel geological detection system disclosed herein adopting a second working mode to output current to a shielding electrode;

[0023] Figure 4 is a schematic diagram of the output current of the transmitting electrode under the condition of electric field synthesis in some embodiments of the tunnel geological detection system according to the present disclosure;

[0024] Figure 5 is a module schematic diagram of a pressure difference signal measurement module in some embodiments of the tunnel geological detection system according to the present disclosure;

[0025] Figure 6 It is a flowchart diagram of some embodiments of the tunnel geological exploration method according to the present disclosure. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the embodiments are described in the specification. However, it should be understood that many implementation-specific settings must be made in the process of implementing the embodiments in order to achieve the specific goals of the developer, for example, to meet those restrictions related to the device and the service, and these restrictions may vary depending on the implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this disclosure.

[0027] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

[0028] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present disclosure are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0029] It should also be understood that in the embodiments of the present disclosure, “plurality” may refer to two or more than two, and “at least one” may refer to one, two, or more than two.

[0030] It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0031] In addition, the term "and / or" in the present disclosure is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present disclosure generally indicates that the associated objects before and after are in an "or" relationship.

[0032] It should also be understood that the description of the various embodiments in the present disclosure focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0033] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0036] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] In addition, in order to avoid obscuring the present disclosure due to unnecessary details, only the processing steps and / or device structures closely related to at least the scheme according to the present disclosure are shown in the drawings, and other details that are not closely related to the present disclosure are omitted. It should also be noted that similar reference numerals and letters in the drawings indicate similar items, and therefore once an item is defined in one drawing, it does not need to be discussed again for subsequent drawings.

[0038] In some embodiments, Figure 1 As shown, the present disclosure provides a tunnel geological detection system, including a transmitting electrode 11, a shielding electrode 12, a return electrode 13, a current source 15, a pressure difference signal measurement module 17, and an acquisition control module 16. The detection circuit corresponding to the first working mode includes the transmitting electrode 11 and the return electrode 13, and the detection circuit corresponding to the second working mode includes the shielding electrode 12 and the return electrode 13.

[0039] The pressure difference signal measuring module 17 detects the voltage difference between the transmitting electrode 11 and the shielding electrode 12, and determines the voltage difference information according to the voltage difference. The tunnel geological detection system may also include a reference electrode 14, which is used to measure the voltage of the transmitting electrode 11, the shielding electrode 12, etc. as a reference voltage.

[0040] The acquisition control module 16 determines the electric field synthesis ratio parameter, and the electric field synthesis ratio parameter can be determined by a variety of methods. According to the electric field synthesis ratio parameter, the acquisition control module 16 controls the current source 15 to output current to the transmitting electrode 11 in the first working mode, and controls the current source 15 to output current to the shielding electrode 12 in the second working mode, so that the transmitting electrode 11 emits current to the target formation under the action of electric field superposition, so as to determine the apparent resistivity corresponding to the target formation.

[0041] The acquisition control module 16 can predict geological information such as the integrity and water content of the target formation by analyzing the change in apparent resistivity. When the transmitting electrode transmits current to the target formation, the voltage differential pressure information determined by the differential pressure signal measurement module 17 is less than the differential pressure threshold, and the differential pressure threshold can be set, for example, the differential pressure threshold can be close to 0. When the differential pressure threshold is close to 0, the voltage differential pressure information determined by the differential pressure signal measurement module 17 can be regarded as 0.

[0042] Tunnel boring equipment is a kind of equipment with high process complexity. It is widely used in the construction of underground tunnel engineering projects. Tunnel boring equipment can be a variety of equipment, such as shield machines. Tunnel boring equipment can include multiple components, such as cutter heads, shields, cylinder propulsion systems, segment assembly systems, etc.

[0043] The transmitting electrode 11 includes a cutterhead of a tunnel excavation device, etc., and the shielding electrode 12 includes a shield of the tunnel excavation device, etc. A variety of existing electrode setting methods can be used to make the cutterhead serve as the transmitting electrode 11 and the shield serve as the shielding electrode 12. The return electrode 13 and the reference electrode 14 can be a variety of electrodes, for example, a first ground anchor inserted into the formation can serve as the return electrode 13, and a second ground anchor inserted into the formation can serve as the reference electrode 14.

[0044] When the current source 15 supplies power to a detection circuit including the emitting electrode 11 and the return electrode 13, the current source 15 adopts the first operating mode to emit current; when the current source 15 supplies power to a detection circuit including the shielding electrode 12 and the return electrode 13, the current source 15 adopts the second operating mode to emit current.

[0045] The acquisition control module 16 determines the electric field synthesis ratio parameter, and when the current source 15 transmits current in a synthesis manner of the first working mode and the second working mode, controls the synthesis ratio of the first working mode and the second working mode, so that the voltage difference information determined by the voltage difference signal measurement module 17 is 0 or approximately zero. The current output by the current source 15 to the transmitting electrode in the first working mode includes a current with a first frequency; the current output by the current source 15 to the transmitting electrode in the second working mode includes a current with a second frequency; the first frequency and the second frequency may be the same or different.

[0046] When the acquisition control module 16 controls the current source 15 to output current to the transmitting electrode 11 in the first working mode according to the electric field synthesis ratio parameter, and controls the current source 15 to output current to the shielding electrode 12 in the second working mode, the current of the transmitting electrode 11 is focused (electric field superposition) by the current of the shielding electrode 12, and emits current toward the target formation; the target formation may be a formation perpendicular to the transmitting electrode 11, etc.

[0047] The acquisition control module 16 determines the apparent resistivity corresponding to the target stratum, and uses a variety of existing methods to determine the geological conditions of the target stratum according to the apparent resistivity, and can perform geological prediction processing. For example, the target stratum is a stratum perpendicular to the tunnel face and located in front of the tunnel face. The resistivity change of the stratum in front of the tunnel face is sensitive, and it is less affected by the stratum resistivity behind the shield machine, so the geological conditions in front of the tunnel face can be better detected.

[0048] The tunnel geological detection system disclosed in the present invention adopts software focusing technology to transform two current fields in non-focused states into focused current fields, which can avoid the potential difference between the transmitting electrode and the shielding electrode, improve the measurement accuracy of the apparent resistivity, and provide accurate geological prediction results for construction; moreover, there is no need to install related hardware circuits for negative feedback on the tunnel excavation equipment, and the tunnel excavation equipment can have the function of tunnel geological detection, which is easy to implement and can reduce costs.

[0049] The acquisition control module 16 can use a variety of methods to determine the electric field synthesis ratio parameter. The acquisition control module 16 obtains the first voltage differential pressure information determined by the differential pressure signal measurement module 17 when the control current source 15 adopts the first working mode to output current to the transmitting electrode 11; the acquisition control module 16 obtains the second voltage differential pressure information determined by the differential pressure signal measurement module 17 when the control current source 15 adopts the second working mode to output current to the shielding electrode 12.

[0050] The acquisition control module 16 determines the electric field synthesis ratio parameter based on the first voltage difference information and the second voltage difference information. For example, the acquisition control module 16 calculates the ratio of the first voltage difference information and the second voltage difference information, and determines the electric field synthesis ratio parameter based on the ratio.

[0051] like Figure 2 As shown, the tunnel geological detection system includes a (transmitting) electrode A0, a (shielding) electrode A1, a return electrode 13 and a reference electrode 14. The cutterhead of the shield machine can be used as a transmitting electrode, and the transmitting electrode is electrode A0; the shield of the shield machine can be used as a shielding electrode, and the shielding electrode is electrode A1; the first ground anchor placed behind the shield machine and inserted into the ground can be used as a return electrode 13; the second ground anchor placed behind the shield machine and inserted into the ground can be used as a reference electrode 14. For example, the return electrode 13 and the reference electrode 14 can be arranged at a position of about 300 meters behind the shield machine, and the return electrode 13 and the reference electrode 14 are equidistant by about 10 meters. A pressure difference signal measurement module 17 for measuring the pressure difference between the shield and the cutterhead can be arranged on the inner side of the shield, near the circumference of the cutterhead position.

[0052] When the current flows from the cutter head into the shield, or when the current flows from the shield into the cutter head, a voltage difference signal will be generated between the cutter head and the shield due to the resistance between the cutter head and the shield. In the first working mode, the acquisition control module 16 controls the current source 15 to power the electrode A0 (cutter head) with a first frequency. The total power supply current is I. After the current flows into the cutter head, it is divided into two parts. One part of the current I0 flows directly into the formation, and the other part of the current I1 flows into the electrode A1 (shield) through the Rogowski coil, etc., and then flows into the formation. According to Kirchhoff's current law, it can be determined that I=I0+I1, and the current source 15 will generate a potential V0 on the electrode A0. The first frequency can be 10Hz, etc.

[0053] The pressure difference signal measurement module 17 can amplify, suppress noise, filter, etc. the pressure difference signal between the shield and the cutter head, add the processed signals to obtain the pressure difference signal VV1 (first voltage pressure difference information), and send the pressure difference information VV1 to the acquisition control module 16. The acquisition control module 16 measures the emission current of the current source 17 and the voltage V0 of the motor A0 relative to the N electrode. The acquisition control module 16 can use a variety of existing methods to measure the voltage V0.

[0054] like Figure 3 As shown, in the second working mode, the acquisition control module 16 controls the current source 15 to use the second frequency to power the electrode A1 (shield), and the total power supply current is I'. After the current flows into the shield, it is divided into two parts. One part of the current I1' flows directly into the formation, and the other part of the current I0' flows into the electrode A0 (cutter head) through the Rogowski coil, and then flows into the formation. According to Kirchhoff's current law, it can be determined that I'=I0'+I1', and the current source 15 will generate a potential V0' on the electrode A0. The second frequency can be 100Hz, etc.

[0055] The current source 15 is used to supply power to the electrode A0 and the return electrode 13, or the electrode A1 and the return electrode 13. Under the control of the acquisition control module 16, the current source 15 can generate current signals of two frequencies, and each current signal is a sinusoidal signal with adjustable frequency amplitude and phase. The electrode A0 and the return electrode 13 are supplied with power by a current having a first frequency, that is, they work in the first working mode, and the electrode A1 and the return electrode 13 are supplied with power by a current having a second frequency, that is, they work in the above-mentioned mode 2.

[0056] The pressure difference signal measurement module 17 amplifies, suppresses noise, and filters the pressure difference signal between the shield and the cutter head, and adds the processed signals to obtain a pressure difference signal VV2 (second voltage pressure difference information). The acquisition control module 16 measures the emission current of the current source and the voltage V0' of the motor A0 relative to the N electrode.

[0057] The acquisition control module 16 can detect and obtain the voltage V0, current I0, current I1, voltage V0', current I0', current I1', etc. through a variety of measuring devices. The acquisition control module 16 can amplify, filter, and perform analog-to-digital conversion on the voltage V0, current I0, current I1, voltage V0', current I0', current I1', etc. to obtain the processed voltage, current and other information. The acquisition control module 16 can also perform low-pass filtering, 50Hz power frequency interference, harmonic signal adaptive notching, DFT (digital Fourier transform) and other processing on the processed voltage, current and other information to obtain the corresponding voltage, current and other information.

[0058] The acquisition control module 16 detects, in the first working mode, a first voltage V0 of the transmitting electrode 11 relative to the reference electrode 14, and a first shunt current I0 flowing into the target formation; the acquisition control module 16 detects, in the second working mode, a second voltage V0' of the transmitting electrode relative to the reference electrode, and a second shunt current I0' flowing into the transmitting electrode.

[0059] The electric field becomes two or more electric fields that can be combined into one electric field through linear superposition. According to the electric field synthesis principle, the first working mode and the second working mode are combined in a ratio of 1:λ to form a synthetic electric field, where λ is the electric field synthesis ratio parameter; a variety of existing methods can be used to combine the current of the first working mode and the current of the second working mode in a ratio of 1:λ.

[0060] The synthesis relationship of the first working mode and the second working mode in a ratio of 1:λ is shown in the following formula 1:

[0061] (Formula 1);

[0062] In the first working mode and the second working mode, the first voltage difference information VV1 and the second voltage difference information VV2 are generated between the electrode A1 (shield) and the electrode A0 (knife disc), respectively, by setting the electric field synthesis ratio parameter , the first working mode and the second working mode form a synthetic mode in a ratio of 1:λ, which can make =0.

[0063] In the synthetic mode, the potential of electrode A0 is V0+λV0', and the current flowing from electrode A0 into the formation is I0+λI0'; let =0, VV1=-λVV2, electric field synthesis ratio parameter Among them, λ is calculated from VV1 and VV2, and VV1 and VV2 can be obtained by measurement.

[0064] like Figure 4 As shown, the electric field synthesis ratio parameter for When , the first working mode and the second working mode are synthesized in a ratio of 1:λ to form a synthetic mode. Determine, and thus 1:λ can be determined.

[0065] The voltage difference between electrode A1 (shield) and electrode A0 (cutterhead) in the synthetic mode is zero. The synthetic mode works in a focusing state. The current flowing out of electrode A1 forces the current flowing out of electrode A0 to enter the target formation in front of the cutterhead perpendicularly to the cutterhead. The focusing state is the equipotential state of the cutterhead and the shield. In this state, the cutterhead and the shield have the same polarity. The current flowing out of the cutterhead is repelled by the current flowing out of the shield and can flow into the target formation in front of the face.

[0066] The acquisition control module 16 determines the apparent resistivity based on the electrode coefficient K, the first voltage V0, the second voltage V0', the first shunt current I0, the second shunt current I0', and the ratio of the first voltage differential information VV1 and the second voltage differential information VV2 generated between the electrode A1 (shield) and the electrode A0 (cutter head). The apparent resistivity corresponding to the target formation reflects the geological conditions of the target formation, and the apparent resistivity can be confirmed by formula 2:

[0067] (Formula 2);

[0068] Among them, Ra is the apparent resistivity corresponding to the target formation, and K is the electrode coefficient, which is a constant.

[0069] According to the electric field synthesis principle, the first working mode and the second working mode are synthesized in a certain ratio (1:λ) to form a synthesis mode. The electric field is formed so that the first working mode is used to provide current to the transmitting electrode, and the second working mode is used to provide current to the shielding electrode, and the two working modes work simultaneously.

[0070] In the first working mode, the pressure difference signal measurement module 17 can amplify, suppress noise, filter and other processes on the pressure difference signal between the shield and the cutter disc, and add the processed signals to obtain the pressure difference signal VV1. The measured cutter disc voltage and the current flowing out of the cutter disc are V0 and I0, respectively. In the second working mode, the pressure difference signal measurement module 17 can amplify, suppress noise, filter and other processes on the pressure difference signal between the shield and the cutter disc, and add the processed signals to obtain the pressure difference signal VV1. The measured cutter disc voltage and the current flowing out of the cutter disc are V0' and I0', respectively.

[0071] In some embodiments, the pressure difference signal measurement module includes multiple amplifier circuits and an adding circuit; each amplifier circuit detects and amplifies the pressure difference signal between the transmitting electrode and the shielding electrode respectively, and the adding circuit adds the pressure difference signals output by each amplifier circuit to generate voltage pressure difference information.

[0072] The pressure difference signal measurement module can be a low-noise amplifier circuit array, which is used to measure the voltage difference signal between the shield and the cutterhead; the pressure difference signal measurement module includes multiple low-noise amplifier circuits and addition circuits. According to the size of the shield machine, different numbers of low-noise amplifier circuits can be arranged at the position of the shield close to the cutterhead. Figure 5 As shown, the amplifier circuit is a low-noise amplifier circuit. Each low-noise amplifier circuit is composed of an instrument amplifier, an industrial frequency notch filter, a bandpass filter, etc. Multiple low-noise amplifier circuits respectively measure and process the voltage difference signal between the shielding electrode A1 and the transmitting electrode A0, and then add them through the addition module to form the final voltage difference signal (voltage difference information).

[0073] The tunnel geological detection system disclosed in the present invention adopts software focusing technology to transform two current fields in non-focused states into focused current fields, which can avoid the potential difference between the transmitting electrode and the shielding electrode, improve the measurement accuracy of the apparent resistivity, and has the advantages of high measurement accuracy and strong real-time performance, and can provide accurate geological prediction results for construction; moreover, the tunnel geological detection system can be conveniently mounted on shield machines to be taken offline, etc., and there is no need to install related hardware circuits for negative feedback, so that the shield machines, etc. have tunnel geological detection functions, which is simple to implement and can reduce costs.

[0074] Figure 6 The present invention is a flow chart of some embodiments of the tunnel geological detection method, which is applied to a tunnel geological detection system. The tunnel geological detection method is executed in a collection control module of the tunnel geological detection system, and includes:

[0075] Step S601, determining electric field synthesis ratio parameters.

[0076] The electric field synthesis ratio parameter can be determined by a variety of methods. For example, when the current source is controlled to output current to the transmitting electrode in the first working mode, the first voltage difference information determined by the voltage difference signal measurement module is obtained; when the current source is controlled to output current to the shielding electrode in the second working mode, the second voltage difference information determined by the voltage difference signal measurement module is obtained.

[0077] The electric field synthesis ratio parameter is determined based on the first voltage difference information and the second voltage difference information. For example, the ratio of the first voltage difference information to the second voltage difference information is calculated, and the electric field synthesis ratio parameter is determined based on the ratio.

[0078] Step S602, according to the electric field synthesis ratio parameter, controls the current source to output current to the transmitting electrode in the first working mode, and controls the current source to output current to the shielding electrode in the second working mode, so that the transmitting electrode transmits current to the target formation under the action of electric field superposition; wherein, when the transmitting electrode transmits current to the target formation, the voltage difference information is less than the voltage difference threshold.

[0079] Step S603, determining the apparent resistivity corresponding to the target formation.

[0080] The apparent resistivity corresponding to the target formation can be determined by various methods. For example, in the first working mode, the first voltage of the transmitting electrode relative to the reference electrode and the first shunt current flowing into the target formation are detected; in the second working mode, the second voltage of the transmitting electrode relative to the reference electrode and the second shunt current flowing into the transmitting electrode are detected; based on the electrode coefficient, the first voltage, the second voltage, the first shunt current, the second shunt current and the ratio, the apparent resistivity is determined.

[0081] In some embodiments, the present disclosure provides a computer-readable storage medium storing computer instructions, which implement the methods in any of the above embodiments when the instructions are executed by a processor.

[0082] Computer readable storage media can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive enumeration) of readable storage media can include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0083] The embodiments of the present disclosure may also be a computer program product, which includes computer program instructions. When the computer program instructions are executed by a processor, the processor executes the steps of the method according to various embodiments of the present disclosure described in the above “Exemplary Method” section of this specification.

[0084] The tunnel geological detection system, method, storage medium and computer program product in the above-mentioned embodiments use software focusing technology to transform two current fields in non-focused states into focused current fields, which can avoid the potential difference between the transmitting electrode and the shielding electrode, improve the measurement accuracy of apparent resistivity, and have the advantages of high measurement accuracy and strong real-time performance, and can provide accurate geological prediction results for construction; moreover, the tunnel geological detection system can be conveniently installed on shield machines to be taken offline, etc., and there is no need to install related hardware circuits for negative feedback, so that the shield machines, etc. have tunnel geological detection functions, which is simple to implement and can reduce costs, thereby improving the user experience.

[0085] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0086] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0087] The block diagrams of the devices, apparatuses, equipment, and systems involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including," "comprising," "having," and the like are open words, referring to "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or," and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0088] It should also be noted that in the apparatus, device and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0089] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0090] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, it will be appreciated by those skilled in the art that the above embodiments are merely illustrative and do not limit the scope of the present disclosure. It will be appreciated by those skilled in the art that the above embodiments may be combined, modified or replaced without departing from the scope and essence of the present disclosure.

Claims

1. A tunnel geological detection system, comprising: Current source, transmitting electrode, shielding electrode, return electrode, differential pressure signal measuring module and acquisition control module; The detection circuit corresponding to the first working mode includes the transmitting electrode and the return electrode, and the detection circuit corresponding to the second working mode includes the shielding electrode and the return electrode; the pressure difference signal measurement module is used to detect the voltage difference between the transmitting electrode and the shielding electrode, and determine the voltage difference information according to the voltage difference; The acquisition control module is used to determine the electric field synthesis ratio parameter; According to the electric field synthesis ratio parameter, the current source is controlled to output current to the transmitting electrode in the first working mode, and the current source is controlled to output current to the shielding electrode in the second working mode, so that the transmitting electrode transmits current to the target formation under the action of electric field superposition, so as to determine the apparent resistivity corresponding to the target formation; wherein, when the transmitting electrode transmits current to the target formation, the voltage difference information is less than the voltage difference threshold.

2. The system of claim 1, wherein: The acquisition control module is used to obtain the first voltage difference information determined by the pressure difference signal measurement module when the current source is controlled to output current to the transmitting electrode in the first working mode; to obtain the second voltage difference information determined by the pressure difference signal measurement module when the current source is controlled to output current to the shielding electrode in the second working mode; and to determine the electric field synthesis ratio parameter based on the first voltage difference information and the second voltage difference information.

3. The system of claim 2, wherein: The acquisition control module is used to calculate the ratio of the first voltage difference information to the second voltage difference information, and determine the electric field synthesis ratio parameter based on the ratio.

4. The system of claim 2, comprising a reference electrode; The acquisition control module is used to detect a first voltage of the transmitting electrode relative to the reference electrode and a first shunt current flowing into the target formation in the first working mode; detecting a second voltage of the transmitting electrode relative to the reference electrode and a second shunt current flowing into the transmitting electrode in the second operating mode; The apparent resistivity is determined based on an electrode coefficient, the first voltage, the second voltage, the first shunt current, the second shunt current, and the ratio.

5. The system of claim 4, wherein: The transmitting electrode comprises the cutter head of the tunnel excavation equipment; the shielding electrode comprises the shield of the tunnel excavation equipment; the return electrode comprises a first anchor inserted into the formation; and the reference electrode comprises a second anchor inserted into the formation.

6. The system of claim 1, wherein: The pressure difference signal measurement module includes multiple amplifier circuits and an adding circuit; the amplifier circuit is used to detect and amplify the pressure difference signal between the transmitting electrode and the shielding electrode; the adding circuit is used to add the pressure difference signals output by each of the amplifier circuits to generate the voltage difference information.

7. The system according to any one of claims 1 to 6, wherein: The current outputted by the current source to the transmitting electrode in the first working mode includes: a current having a first frequency; The current outputted by the current source to the shielding electrode in the second working mode includes: a current with a second frequency.

8. A tunnel geological detection method, applied to a tunnel geological detection system, the tunnel geological detection system comprising a current source, a transmitting electrode, a shielding electrode, a return electrode, a pressure difference signal measurement module and an acquisition control module; the detection circuit corresponding to the first working mode comprises the transmitting electrode and the return electrode, and the detection circuit corresponding to the second working mode comprises the shielding electrode and the return electrode; the pressure difference signal measurement module is used to detect the voltage difference between the transmitting electrode and the shielding electrode, and determine the voltage difference information according to the voltage difference; wherein, The tunnel geological detection method is executed in the acquisition control module, including: Determine the electric field synthesis ratio parameters; According to the electric field synthesis ratio parameter, the current source is controlled to output current to the transmitting electrode in a first working mode, and the current source is controlled to output current to the shielding electrode in a second working mode, so that the transmitting electrode transmits current to the target formation under the action of electric field superposition; wherein, when the transmitting electrode transmits current to the target formation, the voltage difference information is less than the voltage difference threshold; An apparent resistivity corresponding to the target formation is determined.

9. The method according to claim 8, wherein determining the electric field synthesis ratio parameter comprises: Under the condition that the current source is controlled to output current to the transmitting electrode in the first working mode, first voltage difference information determined by the voltage difference signal measuring module is obtained; Under the condition that the current source is controlled to output current to the shielding electrode in the second working mode, obtaining the second voltage difference information determined by the voltage difference signal measuring module; The electric field synthesis ratio parameter is determined based on the first voltage difference information and the second voltage difference information.

10. The method of claim 9, wherein: The determining the electric field synthesis ratio parameter based on the first voltage difference information and the second voltage difference information comprises: Calculating a ratio of the first voltage difference information to the second voltage difference information; The electric field synthesis ratio parameter is determined based on the ratio.

11. The method of claim 9, wherein: The tunnel geological detection system includes a reference electrode; Determining the apparent resistivity corresponding to the target formation comprises: detecting a first voltage of the transmitting electrode relative to the reference electrode and a first shunt current flowing into the target formation in the first working mode; detecting a second voltage of the transmitting electrode relative to the reference electrode and a second shunt current flowing into the transmitting electrode in the second operating mode; The apparent resistivity is determined based on an electrode coefficient, the first voltage, the second voltage, the first shunt current, the second shunt current, and the ratio.

12. The method according to any one of claims 8 to 11, wherein: The current outputted by the current source to the transmitting electrode in the first working mode includes: a current having a first frequency; The current outputted by the current source to the shielding electrode in the second working mode includes: a current with a second frequency.

13. A computer-readable storage medium storing computer instructions, wherein the instructions are executed by a processor to perform the method according to any one of claims 8 to 12.

14. A computer program product, wherein the computer program product stores computer instructions, wherein the instructions are executed by a processor to perform the method according to any one of claims 8 to 12.

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