A landslide deformation and ground settlement monitoring method and system based on weak grating array monitoring

Abstract

The present invention relates to the technical field of landslide deformation and ground subsidence monitoring, and in particular to a landslide deformation and ground subsidence monitoring method based on weak grating array monitoring. The method arranges a grating in a monitoring area on the ground, illuminates the grating to stimulate a reflection signal from the grating array, and periodically receives the reflection signal to quickly obtain ground data information. At the same time, the method determines whether the data information meets standards based on the average value of the strain force exerted on the optical fiber in the data information, thereby quickly determining the validity of the data information. If it is determined that the data information does not meet the standards, the average value of the strain force is used to preliminarily determine the reason why the data information does not meet the standards. The reason why the data information does not meet the standards can be accurately determined, and a corresponding processing method can be generated based on the reason for the non-compliance with the standards, and a corresponding adjustment notification can be issued based on the processing method, thereby improving the accuracy of subsequent ground subsidence monitoring and further reducing the error rate.

Description

Technical Field

[0001] The present invention relates to the technical field of landslide deformation and ground settlement monitoring, and in particular to a landslide deformation and ground settlement monitoring method and system based on weak grating array monitoring. Background Art

[0002] A landslide deformation and ground subsidence monitoring method based on weak fiber grating array monitoring utilizes a weak fiber grating array sensor to monitor ground subsidence and landslide deformation in real time. The weak fiber grating array sensor consists of multiple weak fiber gratings (FBGs). These FBGs can sense changes in optical fiber strain caused by ground subsidence or landslide deformation and convert these changes into changes in optical signals. However, existing technologies cannot accurately determine the severity of ground subsidence based on these optical signal changes.

[0003] Chinese patent publication number: CN110749304A, discloses a substation ground subsidence monitoring device and method based on weak grating. The device includes an ultra-weak grating strain optical cable, a weak grating demodulation module, and a data processing and communication terminal. The ultra-weak grating strain optical cable is connected to the weak grating demodulation module, and the weak grating demodulation module is connected to the data processing and communication terminal. The ultra-weak grating strain optical cable is used for transmitting optical signals and sensing strain. The weak grating demodulation module is used to demodulate the wavelength changes reflected by the ultra-weak grating. The data processing and communication terminal is used to process the wavelength data and obtain substation ground subsidence information.

[0004] It can be seen that the above scheme has the following problems: it does not judge whether the received data information meets the standards based on the strain force exerted on the grating, and when the data information does not meet the standards, it does not eliminate the reasons for the number standards of the arranged gratings and the angle of the irradiation light, which leads to inaccurate monitoring results of ground subsidence. Summary of the Invention

[0005] To this end, the present invention provides a landslide deformation and ground subsidence monitoring method based on weak grating array monitoring to overcome the problem of inaccurate monitoring results for ground subsidence in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides a method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring, comprising:

[0007] Arrange light barriers in the monitoring area on the ground;

[0008] Using the irradiation light to excite the reflected signal of the grating array;

[0009] detecting the reflected signal;

[0010] periodically receiving the reflected signal from the grating array;

[0011] Demodulating corresponding data information based on the reflected signal, wherein the data information includes the strain force exerted on the optical fiber;

[0012] Determining whether the data information complies with the standard based on the strain force exerted on the optical fiber, and when it is determined that the data information does not comply with the standard, generating a corresponding processing method based on the determined reason for non-compliance with the standard, including an alarm, a notification for adjusting the number of arranged gratings, and a notification for adjusting the illumination angle;

[0013] Issue corresponding notifications based on the reasons for non-compliance with the standards and the corresponding handling methods.

[0014] Furthermore, the process of determining whether the data information complies with the standard based on the strain force exerted on the optical fiber includes: calculating the average value of the strain force exerted on the optical fiber, and comparing the obtained average value with the pre-stored preset strain force; if the average value is less than or equal to a first preset strain force, determining whether the data information complies with the standard; if the average value is greater than the first preset strain force and less than a second preset strain force, determining whether the data information complies with the standard based on the variance of the strain force in each cycle; if the average value is greater than or equal to the second preset strain force, determining that the data information does not comply with the standard, and determining the reason why the data information does not comply with the standard based on the difference between the strain force of the current cycle and the preset strain force.

[0015] Furthermore, the process of determining whether the data information meets the standard based on the variance of the strain force in each cycle includes: comparing the obtained variance with a preset variance; if the variance is greater than or equal to the preset variance, determining that part of the data information does not meet the standard, and determining the reason why the data information does not meet the standard based on counting the number of strain forces greater than the preset strain force; if the variance is less than the preset variance, determining that the data information does not meet the standard, and determining the reason why the data information does not meet the standard based on the difference between the strain force in the current cycle and the second preset strain force.

[0016] Furthermore, the process of determining the reason why the data information does not meet the standard based on the statistical number of the strain force greater than the preset strain force includes: if the number is greater than the preset number, it is determined that there is a problem with the illumination light angle, and the illumination light angle is adjusted based on the difference between the number and the preset number, wherein the illumination light angle is the angle between the normal of the grating and the illumination light; if the number is less than or equal to the preset number, it is determined that the ground subsidence is serious, and a warning notification is issued.

[0017] Furthermore, the process of adjusting the illumination light angle based on the difference between the quantity and the preset quantity includes: obtaining the difference between the quantity and the preset quantity; reducing the illumination light angle based on the difference, and the difference is proportional to the reduction amplitude of the illumination light angle; and re-determining the illumination light intensity based on the adjusted illumination light angle.

[0018] Furthermore, the process of re-determining the illumination light intensity based on the adjusted illumination light angle includes: increasing the illumination light intensity based on the illumination light angle, and the illumination light angle is inversely proportional to the increase amplitude of the illumination light intensity.

[0019] Furthermore, the process of determining the reason why the data information does not meet the standard based on the difference between the strain force of the current cycle and the preset strain force includes: calculating the absolute value of the difference between the strain force of the current cycle and the preset strain force, and comparing the absolute value with the pre-stored preset absolute value; if the absolute value is greater than or equal to a first preset absolute value, it is determined that the ground subsidence is serious, and a warning notification is issued; if the absolute value is less than the first preset absolute value and greater than a second preset absolute value, a cycle-strain curve is drawn, and the reason why the data information does not meet the standard is determined based on the characteristics of the cycle-strain curve; if the absolute value is less than or equal to the second preset absolute value, it is determined that there is a problem with the number standard of arranging the gratings, and the number standard of arranging the gratings is adjusted based on the difference between the absolute value and the preset absolute value.

[0020] Furthermore, the process of determining the reason why the data information does not meet the standards based on the characteristics of the periodic-strain-force curve includes: determining whether the periodic-strain-force curve has regularity based on the autocorrelation function; determining the reason why the data information does not meet the standards based on whether the periodic-strain-force curve has regularity; if the periodic-strain-force curve has regularity, it is determined that the reason is that the ground is in a period of subsidence caused by natural conditions, and the strain force of the corresponding grating is continuously monitored; if the periodic-strain-force curve does not have regularity, it is determined that the reason is that the ground subsidence is serious, and a warning notification is issued.

[0021] Furthermore, the process of adjusting the quantity standard for arranging gratings based on the difference between the absolute value and the preset absolute value includes: calculating the difference between the absolute value and the preset absolute value; increasing the quantity standard for arranging gratings based on the difference, and the difference is proportional to the increase in the quantity standard.

[0022] To achieve the above-mentioned object, the present invention provides a landslide deformation and ground subsidence monitoring system based on weak grating array monitoring, comprising:

[0023] A sensing unit, which is used to arrange a grating in the monitoring area on the ground;

[0024] an illumination unit connected to the sensing unit and configured to provide a reflection signal of the grating array excited by illumination light;

[0025] a detection unit connected to the illumination unit and configured to detect the reflection signal;

[0026] a receiving unit connected to the detecting unit and configured to periodically receive the reflected signal from the grating array;

[0027] a processing unit connected to the receiving unit and configured to demodulate corresponding data information based on the reflected signal, wherein the data information includes the strain force exerted on the optical fiber;

[0028] an analysis unit connected to the processing unit, configured to determine whether the data information complies with the standard based on the strain force exerted on the optical fiber, and, when it is determined that the data information does not comply with the standard, generate a corresponding processing method based on the determined reason for non-compliance, including an alarm, a notification for adjusting the number of arranged gratings, and a notification for adjusting the illumination angle;

[0029] The control unit is connected to the analysis unit and is used to issue a corresponding notification based on a corresponding treatment method for the reason of non-compliance with the standard.

[0030] Compared with the prior art, the beneficial effect of the present invention lies in that the method arranges a grating in the monitoring area on the ground and illuminates the grating to stimulate the reflection signal of the grating array. By periodically receiving the reflection signal, the method can quickly obtain ground data information. At the same time, the average value of the strain force exerted on the optical fiber in the data information is used to determine whether the data information meets the standard. The validity of the data information can be quickly determined. When it is determined that the data information does not meet the standard, the average value of the strain force is used to preliminarily determine the reason why the data information does not meet the standard. The reason why the data information does not meet the standard can be accurately determined, so that a corresponding processing method can be generated according to the reason for non-compliance with the standard, and a corresponding adjustment notification can be issued according to the processing method, thereby improving the accuracy of subsequent ground subsidence monitoring and further reducing the misjudgment rate.

[0031] Furthermore, the present invention determines whether the data information meets the standards by the average value of the strain force exerted on the grating, and can determine whether the monitored data information meets the standards, thereby more effectively monitoring the ground subsidence and further improving the efficiency of monitoring the ground subsidence.

[0032] Furthermore, the present invention performs a secondary determination on whether the data information meets the standards through the variance of the strain force exerted on each periodic grating, which can more accurately determine whether the data information meets the standards, thereby further improving the efficiency of monitoring ground subsidence.

[0033] Furthermore, the present invention determines that the reason why the data information does not meet the standard is that there is a problem with the illumination light angle or the ground subsidence is serious through the amount of strain force greater than the preset strain force, and generates a corresponding processing method, which can make subsequent monitoring of ground subsidence more accurate, thereby improving the accuracy of monitoring ground subsidence.

[0034] Furthermore, the present invention adjusts the illumination light angle by the difference between the quantity and the preset quantity, and can adjust the illumination light angle more accurately, thereby making subsequent monitoring of ground subsidence more accurate, thereby further improving the efficiency of ground subsidence monitoring.

[0035] Furthermore, the present invention adjusts the intensity of the irradiated light by reducing the angle of the irradiated light, which can more accurately adjust the intensity of the irradiated light, thereby further improving the efficiency of ground subsidence monitoring.

[0036] Furthermore, the present invention determines the reason why the data information does not meet the standard by comparing the absolute value of the difference between the strain force of the current cycle and the preset strain force with the preset absolute value, which can more accurately determine the reason why the data information does not meet the standard, so that subsequent improvements can be made more targeted, thereby further improving the monitoring accuracy of ground subsidence.

[0037] Furthermore, the present invention determines the reason why the data information does not meet the standards through the characteristics of the drawn cycle-strain curve and generates a corresponding processing method, which can make the subsequent monitoring of ground subsidence more accurate, thereby further improving the monitoring accuracy of ground subsidence.

[0038] Furthermore, the present invention adjusts the quantity standard of arranging gratings by adjusting the absolute value of the difference between the strain force of the current cycle and the preset strain force and the preset absolute value, which can more accurately adjust the quantity standard of arranging gratings, thereby making the monitoring of ground subsidence more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the modules of a landslide deformation and ground subsidence monitoring system based on weak grating array monitoring according to an embodiment of the present invention;

[0040] Figure 2 This is a flowchart of the steps of a method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to an embodiment of the present invention;

[0041] Figure 3 A flowchart of the steps for determining the result of comparing the average value of the strain force on the optical fiber with a pre-stored preset average value according to an embodiment of the present invention;

[0042] Figure 4 4 is a flowchart of the steps of performing determination based on the absolute value of the difference between the strain force of the current cycle and the preset strain force and the preset absolute value according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] It should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] See also Figure 1 As shown, it is a module diagram of a landslide deformation and ground subsidence monitoring system based on weak grating array monitoring:

[0047] A sensing unit, which is used to arrange a grating in the monitoring area on the ground;

[0048] an illumination unit connected to the sensing unit and configured to provide a reflection signal of the grating array excited by illumination light;

[0049] a detection unit connected to the illumination unit and configured to detect the reflection signal;

[0050] a receiving unit connected to the detecting unit and configured to periodically receive the reflected signal from the grating array;

[0051] a processing unit connected to the receiving unit and configured to demodulate corresponding data information based on the reflected signal, wherein the data information includes the strain force exerted on the optical fiber;

[0052] an analysis unit connected to the processing unit, configured to determine whether the data information complies with the standard based on the strain force exerted on the optical fiber, and, when it is determined that the data information does not comply with the standard, generate a corresponding processing method based on the determined reason for non-compliance, including an alarm, a notification for adjusting the number of arranged gratings, and a notification for adjusting the illumination angle;

[0053] The control unit is connected to the analysis unit and is used to issue a corresponding notification based on a corresponding treatment method for the reason of non-compliance with the standard.

[0054] Specifically, in this embodiment, the sensing unit is laid in the ground area that needs to be monitored. The laying principle is to fit the monitored ground as closely as possible to monitor more accurately. Then, the lighting unit is fixed on the guide rail. The position of the lighting unit on the guide rail is adjusted to achieve the illumination angle between the lighting unit and the grating. The detection unit is used to detect the specific position of the reflected signal so as to subsequently receive the reflected signal. The receiving unit periodically receives the reflected signal of the grating array, and the processing unit is used to demodulate the reflected signal received by the receiving unit. The process is to convert the reflected signal into an electrical signal by photoelectric conversion, and amplify the electrical signal by a preamplifier to improve the signal. The intensity of the signal is measured, and finally the amplified electrical signal is filtered through a filter to remove interference components and ensure the clarity and accuracy of the signal. During the demodulation process, the processing unit extracts data information related to the optical fiber strain from the reflected signal. This data information includes the magnitude of the strain. Afterwards, the analysis unit uses the average value of the strain on the optical fiber to determine whether the data information meets the standard, and uses the average value of the strain to preliminarily determine the reason why the data information does not meet the standard, and generates a corresponding processing method based on the reason for non-compliance with the standard. Finally, the control unit issues a corresponding notification based on the corresponding processing method for the reason for non-compliance with the standard.

[0055] See also Figure 2 As shown, it is a flow chart of the steps of a method for monitoring landslide deformation and ground settlement based on weak grating array monitoring according to an embodiment of the present invention.

[0056] The steps in the actual operation process of the system of the embodiment of the present invention include:

[0057] S1, arranging gratings in the monitoring area on the ground;

[0058] S2, the reflected signal of the grating array is excited by the illumination light;

[0059] S3, detecting the reflected signal;

[0060] S4, periodically receiving the reflected signal from the grating array;

[0061] S5, demodulating corresponding data information based on the reflected signal, wherein the data information includes the strain force exerted on the optical fiber;

[0062] S6, determining whether the data information complies with the standard based on the strain force exerted on the optical fiber, and if it is determined that the data information does not comply with the standard, generating a corresponding treatment method based on the determined reason for non-compliance with the standard, including an alarm, a notification for adjusting the number of arranged gratings, and a notification for adjusting the illumination angle;

[0063] S7, issuing a corresponding notification based on the corresponding handling method for the reason for non-compliance with the standards.

[0064] See also Figure 3 , which is a flowchart of the steps for determining whether data information complies with a standard based on a comparison result of an average value of strain applied to an optical fiber with a pre-stored preset average value, according to an embodiment of the present invention. The process of determining whether data information complies with a standard based on the strain applied to the optical fiber according to an embodiment of the present invention includes: calculating the average value of the strain applied to the optical fiber, and comparing the calculated average value with a pre-stored preset strain value; if the average value is less than or equal to a first preset strain value, determining whether the data information complies with the standard; if the average value is greater than the first preset strain value and less than a second preset strain value, determining whether the data information complies with the standard based on the variance of the strain force in each cycle; if the average value is greater than or equal to the second preset strain value, determining that the data information does not comply with the standard, and determining the reason for the data information not complying with the standard based on the difference between the strain force in the current cycle and the preset strain force.

[0065] Specifically, in this embodiment, the average value L0 of the strain force on the optical fiber can be divided into a first preset strain force L1 and a second preset strain force L2. The first preset strain force L1 is set to 100 με, and the second preset strain force L2 is set to 1000 με. It should be noted that the principle of setting L1 is the maximum strain force on the corresponding optical fiber when the ground settlement is normal, and the principle of setting L2 is the strain force on the optical fiber when the ground settlement is abnormal. In other embodiments, the values ​​of L1 and L2 can also be determined according to the relative landslide deformation ground settlement requirements, and the values ​​of the average values ​​are rounded up. The comparison process based on the average value L with L1 and L2 is as follows:

[0066] If the average value L is less than or equal to the first preset strain force L1, it indicates that the data acquisition process meets the standard and the ground subsidence situation is normal, and the data information is determined to meet the standard;

[0067] If the average value L is greater than the first preset strain force L1 and less than the second preset strain force L2, it means that a secondary determination is required based on the variance P of the strain force in each cycle to determine whether the data information meets the standard;

[0068] If the average value L is greater than or equal to the second preset strain force L2, it means that the strain force on the optical fiber exceeds the maximum preset value, then the data information is determined to be non-compliant with the standard, and the reason why the data information does not meet the standard is determined based on the difference between the strain force of the current cycle and the preset strain force.

[0069] Specifically, the process of determining whether the data information meets the standard based on the variance of the strain force in each cycle in an embodiment of the present invention includes: comparing the obtained variance with the preset variance; if the variance is greater than or equal to the preset variance, determining that part of the data information does not meet the standard, and determining the reason why the data information does not meet the standard based on counting the number of strain forces greater than the preset strain force; if the variance is less than the preset variance, determining that the data information does not meet the standard, and determining the reason why the data information does not meet the standard based on the difference between the strain force in the current cycle and the second preset strain force.

[0070] Specifically, in this embodiment, the preset variance P0=0.95, and the comparison process based on the obtained variance P and the preset variance P0 is as follows:

[0071] If the variance P is greater than or equal to the preset variance P0, it indicates that the dispersion of the strain force on the optical fiber is relatively high, and the reason why the data information does not meet the standard is determined based on the number T of strain forces greater than the preset strain force.

[0072] If the variance P is less than the preset variance P0, it indicates that the discreteness of the strain force on the optical fiber is low, and the data information is determined to be non-compliant with the standard. The reason why the data information does not meet the standard is determined based on the difference between the strain force of the current cycle and the second preset strain force.

[0073] Specifically, the embodiment of the present invention includes a process for determining the reason why data information does not meet the standard based on counting the number of strain forces that are greater than the preset strain forces: if the number is greater than the preset number, it is determined that there is a problem with the illumination light angle, and the illumination light angle is adjusted based on the difference between the number and the preset number, wherein the illumination light angle is the angle between the normal of the grating and the illumination light; if the number is less than or equal to the preset number, it is determined that the ground subsidence is serious, and a warning notification is issued.

[0074] Specifically, in this embodiment, the preset number T0=6, and the comparison process based on the number T and the preset number T0 is as follows:

[0075] If the number T is greater than the preset number T0, it indicates that there is a problem in the data collection process and it is determined that there is a problem with the illumination light angle, and the illumination light angle is adjusted based on the difference W between the number and the preset number, where the illumination light angle is the angle between the normal line of the grating and the illumination light;

[0076] If the number T is less than or equal to the preset number T0, it indicates that there is no problem in the data collection process, and it is determined that the ground subsidence is serious, and a warning notification is issued.

[0077] Specifically, the process of adjusting the illumination light angle based on the difference between the quantity and the preset quantity in an embodiment of the present invention includes: obtaining the difference between the quantity and the preset quantity; reducing the illumination light angle based on the difference, and the difference is proportional to the degree of reduction of the illumination light angle; and re-determining the illumination light intensity based on the adjusted illumination light angle.

[0078] Specifically, in this embodiment, the preset difference value W0=2, and the comparison result based on the difference value W and the preset difference value W0 is determined as follows:

[0079] If the difference W is less than or equal to the preset difference W0, the irradiation light angle is adjusted to 0.9 times the original irradiation light angle;

[0080] If the difference W is greater than the preset difference W0, the irradiation light angle is adjusted to 0.6 times the original irradiation light angle.

[0081] Specifically, the process of re-determining the illumination light intensity based on the adjusted illumination light angle in the embodiment of the present invention includes: increasing the illumination light intensity based on the illumination light angle, and the illumination light angle is inversely proportional to the increase in the illumination light intensity.

[0082] Specifically, in this embodiment, the preset illumination light angle M0=35 0 , based on the comparison result of the illumination light angle M and the preset illumination light angle M0, the judgment is as follows:

[0083] If the irradiation light angle M is less than or equal to the preset irradiation light angle M0, the irradiation light intensity is adjusted to 1.8 times the original irradiation light intensity;

[0084] If the irradiation light angle M is greater than the preset irradiation light angle M0, the irradiation light intensity is adjusted to 1.2 times the original irradiation light intensity.

[0085] See also Figure 4 As shown, it is a flowchart of the steps of determining the reason why the data information does not meet the standard based on the absolute value of the difference between the strain force of the current cycle and the preset strain force and the preset absolute value in an embodiment of the present invention. The process of determining the reason why the data information does not meet the standard based on the difference between the strain force of the current cycle and the preset strain force in an embodiment of the present invention includes: calculating the absolute value of the difference between the strain force of the current cycle and the preset strain force, and comparing the absolute value with a pre-stored preset absolute value; if the absolute value is greater than or equal to a first preset absolute value, it is determined that the ground subsidence is serious, and a warning notification is issued; if the absolute value is less than the first preset absolute value and greater than a second preset absolute value, a cycle-strain curve is drawn, and the reason why the data information does not meet the standard is determined based on the characteristics of the cycle-strain curve; if the absolute value is less than or equal to the second preset absolute value, it is determined that there is a problem with the number standard of grating arrangement, and the number standard of grating arrangement is adjusted based on the difference between the absolute value and the preset absolute value.

[0086] Specifically, in this embodiment, the absolute value R can be divided into a first preset absolute value R1 and a second preset absolute value R2. In the absolute value standard, the first preset absolute value R1=300με and the second preset absolute value R2=100με. It should be noted that, in other embodiments, the values ​​of R1 and R2 can also be determined according to the relative landslide deformation and ground settlement requirements. The comparison process based on the absolute value R and R1 and R2 is as follows:

[0087] If the absolute value R is greater than or equal to the first preset absolute value R1, it means that the stress on the grating is greater than the preset value of the force, and it is determined that the ground subsidence is serious, and a warning notification is issued;

[0088] If the absolute value R is less than the first preset absolute value R1 and greater than the second preset absolute value R2, a secondary determination is required as to why the data information does not meet the standard. A cycle-strain-force curve is drawn, and the reason why the data information does not meet the standard is determined based on the characteristics of the cycle-strain-force curve.

[0089] If the absolute value R is less than or equal to the second preset absolute value R2, it is determined that there is a problem with the quantity standard for arranging the gratings, and the quantity standard for arranging the gratings is adjusted based on the difference N between the absolute value and the second preset absolute value.

[0090] Specifically, the process of determining the reason why the data information does not meet the standards based on the characteristics of the periodic-strain-force curve in an embodiment of the present invention includes: determining whether the periodic-strain-force curve has regularity based on an autocorrelation function; determining the reason why the data information does not meet the standards based on whether the periodic-strain-force curve has regularity; if the periodic-strain-force curve has regularity, it is determined that the reason is that the ground is in a period of subsidence caused by natural conditions, and the strain force of the corresponding grating is continuously monitored; if the periodic-strain-force curve does not have regularity, it is determined that the reason is that the ground has severely subsided, and a warning notification is issued.

[0091] Specifically, in this embodiment, the process of determining whether the cycle-strain curve has regularity based on the autocorrelation function specifically includes: first, data preparation, which includes a data acquisition step and a preprocessing step, wherein the data acquisition is to collect cycle-strain data, and the preprocessing step is to remove trends and outliers to ensure data stability; second, the autocorrelation function is calculated, and the periodicity is judged using an autocorrelation function graph with the horizontal axis as the lag number and the vertical axis as the autocorrelation value. If the autocorrelation function graph shows a periodic peak, it indicates that the data has regularity.

[0092] Specifically, the process of adjusting the quantity standard for arranging gratings based on the difference between the absolute value and the preset absolute value in an embodiment of the present invention includes: calculating the difference between the absolute value and the preset absolute value; increasing the quantity standard for arranging gratings based on the difference, and the difference is proportional to the increase in the quantity standard.

[0093] Specifically, in this embodiment, the preset difference N0 between the absolute value and the preset absolute value is 100, and the comparison result based on the difference N and the preset difference N0 is determined as follows:

[0094] If the difference N is less than or equal to the preset difference N0, the number standard of the arranged gratings is adjusted to 1.2 times the original number standard;

[0095] If the difference N is greater than the preset difference N0, the quantity standard for arranging the gratings is adjusted to 2.8 times the original quantity standard.

[0096] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0097] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A landslide deformation and ground settlement monitoring method based on weak grating array monitoring, characterized in that: include: Arrange light barriers in the monitoring area on the ground; Using the irradiation light to excite the reflected signal of the grating array; detecting the reflected signal; periodically receiving the reflected signal from the grating array; Demodulating corresponding data information based on the reflected signal, wherein the data information includes the strain force exerted on the optical fiber; Determining whether the data information complies with the standard based on the strain force exerted on the optical fiber, and when it is determined that the data information does not comply with the standard, generating a corresponding processing method based on the determined reason for non-compliance with the standard, including an alarm, a notification for adjusting the number of arranged gratings, and a notification for adjusting the illumination angle; Issue corresponding notifications based on the reasons for non-compliance with the standards and the corresponding handling methods.

2. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 1 is characterized in that: The process of determining whether the data information complies with the standard based on the strain force exerted on the optical fiber includes: Calculating an average value of the strain applied to the optical fiber, and comparing the calculated average value with a pre-stored preset strain; If the average value is less than or equal to the first preset strain force, it is determined that the data information meets the standard; If the average value is greater than the first preset strain force and less than the second preset strain force, determining whether the data information meets the standard based on the variance of the strain force in each cycle; If the average value is greater than or equal to the second preset strain force, it is determined that the data information does not meet the standard, and the reason why the data information does not meet the standard is determined based on the difference between the strain force of the current cycle and the preset strain force.

3. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 2, characterized in that: The process of determining whether the data information meets the standard based on the variance of the strain force in each cycle includes: Compare the obtained variance with the preset variance; If the variance is greater than or equal to the preset variance, it is determined that part of the data information does not meet the standard, and the reason why the data information does not meet the standard is determined based on the number of strains greater than the preset strain; If the variance is smaller than the preset variance, it is determined that the data information does not meet the standard, and the reason why the data information does not meet the standard is determined based on the difference between the strain force of the current cycle and the second preset strain force.

4. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 3 is characterized in that: The process of determining the reason why the data information does not meet the standard based on counting the number of strain forces greater than the preset strain force includes: If the number is greater than a preset number, it is determined that there is a problem with the illumination light angle, and the illumination light angle is adjusted based on the difference between the number and the preset number, wherein the illumination light angle is the angle between the normal of the grating and the illumination light; If the number is less than or equal to the preset number, it is determined that the ground subsidence is serious and a warning notification is issued.

5. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 4 is characterized in that: The process of adjusting the angle of the irradiated light based on the difference between the quantity and the preset quantity includes: obtaining a difference between the quantity and the preset quantity; reducing the illumination light angle based on the difference, wherein the difference is proportional to the magnitude of the reduction in the illumination light angle; The illumination light intensity is re-determined based on the adjusted illumination light angle.

6. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 5, characterized in that: The process of re-determining the intensity of the illumination light based on the adjusted illumination light angle includes: The illumination light intensity is increased based on the illumination light angle, and the illumination light angle is inversely proportional to the increase magnitude of the illumination light intensity.

7. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 2, characterized in that: The process of determining the reason why the data information does not meet the standard based on the difference between the strain force of the current cycle and the preset strain force includes: Calculating the absolute value of the difference between the strain force of the current cycle and the preset strain force, and comparing the absolute value with a pre-stored preset absolute value; If the absolute value is greater than or equal to a first preset absolute value, it is determined that the ground subsidence is serious, and a warning notification is issued; If the absolute value is less than the first preset absolute value and greater than the second preset absolute value, plotting a cycle-strain force curve, and determining the reason why the data information does not meet the standard based on the characteristics of the cycle-strain force curve; If the absolute value is less than or equal to the second preset absolute value, it is determined that there is a problem with the quantity standard for arranging the gratings, and the quantity standard for arranging the gratings is adjusted based on the difference between the absolute value and the preset absolute value.

8. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 7, characterized in that: The process of determining the reason why the data information does not meet the standards based on the characteristics of the cyclic-strain curve includes: Determine whether the cycle-strain curve has regularity based on the autocorrelation function; determining the reason why the data information does not meet the standard based on whether the cycle-strain curve has regularity; If the period-strain curve has regularity, it is determined that the cause is that the ground is in a period of subsidence caused by natural conditions, and the strain of the corresponding grating is continuously monitored; If the cycle-strain curve is irregular, it is determined that the cause is severe ground subsidence, and a warning notification is issued.

9. The method for monitoring landslide deformation and ground subsidence based on weak grating array monitoring according to claim 7, characterized in that: The process of adjusting the quantity standard of the arranged grating based on the difference between the absolute value and the preset absolute value includes: Calculating a difference between the absolute value and the preset absolute value; The quantity standard for arranging the gratings is increased based on the difference, and the difference is proportional to the increase of the quantity standard.

10. A landslide deformation and ground settlement monitoring system based on weak grating array monitoring, characterized in that: include: A sensing unit, which is used to arrange a grating in the monitoring area on the ground; an illumination unit connected to the sensing unit and configured to provide a reflection signal of the grating array excited by illumination light; a detection unit connected to the illumination unit and configured to detect the reflection signal; a receiving unit connected to the detecting unit and configured to periodically receive the reflected signal from the grating array; a processing unit connected to the receiving unit and configured to demodulate corresponding data information based on the reflected signal, wherein the data information includes the strain force exerted on the optical fiber; an analysis unit connected to the processing unit, configured to determine whether the data information complies with the standard based on the strain force exerted on the optical fiber, and, when it is determined that the data information does not comply with the standard, generate a corresponding processing method based on the determined reason for non-compliance, including an alarm, a notification for adjusting the number of arranged gratings, and a notification for adjusting the illumination angle; The control unit is connected to the analysis unit and is used to issue a corresponding notification based on a corresponding treatment method for the reason of non-compliance with the standard.

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