Long-term dynamic monitoring equipment for temperature and humidity field of key landslide part in frozen earth region

Abstract

The utility model provides a frozen soil area landslide key part temperature and humidity field long-term dynamic monitoring device, and relates to the technical field of intelligent equipment, and the device comprises a measurement control host which is connected with a first PVC hard pipe and a second PVC hard pipe through a cable; the first PVC hard tube and the second PVC hard tube are respectively provided with a power supply electrode and a measuring electrode; third containing holes are formed in the second PVC hard pipe at intervals of a third preset distance, and a temperature measuring probe is contained in each third containing hole. The corresponding electrodes are supported by the two PVC hard tubes, the temperature measuring probe is buried underground to work for a long time, the water content profile is converted into the resistivity profile based on an indoor soil test, and in-situ dynamic long-term monitoring of the soil water content profile and the temperature of the key part of the landslide is achieved. The device can help to analyze soil freeze-thaw states and daily freeze-thaw cycle processes of different parts of the landslide and moisture infiltration processes of key parts of the landslide under rainfall conditions and freeze-thaw conditions, and is simple in structure, efficient and reliable.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of intelligent devices, in particular to a long-term dynamic monitoring device for a temperature and humidity field of a key position of a landslide in a frozen soil area. BACKGROUND

[0002] The occurrence of a landslide geological disaster in a frozen soil area is closely related to the changes in soil moisture and temperature, and therefore it is crucial to monitor the temperature and humidity field of the landslide in the frozen soil area. Traditional landslide soil moisture content monitoring is often carried out by using a single-point measurement method, and the moisture content profile in the region is inferred from a limited number of monitoring points. Considering the non-uniformity of the soil body and the great variability in the spatial scale, the landslide moisture content profile inferred by the single-point moisture content measurement method may have a large gap with the actual moisture distribution, which is not conducive to the subsequent research on the landslide water infiltration process. In terms of temperature monitoring, the traditional method usually involves drilling a hole in a landslide or a region, and then burying a temperature detector at a certain interval. However, this monitoring method ignores the differences in temperature at different positions of the landslide. When the monitored landslide is a large landslide, for example, the height difference between the front and rear edges is 300m to 400m, and the soil temperature at the slope foot will be about 1.8℃ to 2.4℃ higher than that at the slope top. Therefore, at the same time, the freezing and thawing states at different positions of the same landslide will be different, and the intensity of the daily freezing and thawing cycle will also be different. Therefore, the traditional soil temperature measurement method cannot reflect the true freezing and thawing conditions of the landslide soil body. SUMMARY

[0003] The application point of the application aims to help analyze the soil freezing and thawing states at different positions of a landslide and the daily freezing and thawing cycle process, as well as the water infiltration process in the key position of the landslide under the conditions of rainfall and freezing and thawing, and provides a long-term dynamic monitoring device for a temperature and humidity field of a key position of a landslide in a frozen soil area.

[0004] The technical scheme of the application embodiment is implemented as follows:

[0005] The application embodiment provides a long-term dynamic monitoring device for a temperature and humidity field of a key position of a landslide in a frozen soil area, which comprises:

[0006] a measurement control host, wherein the measurement control host is connected with a first PVC hard pipe and a second PVC hard pipe through a cable;

[0007] a first accommodating hole is arranged on the first PVC hard pipe at a first preset distance, and one power supply electrode is accommodated in each first accommodating hole; a plurality of power supply electrodes are connected in series and connected with the measurement control host through the first cable;

[0008] The second PVC rigid pipe is arranged parallel to the first PVC rigid pipe. The second PVC rigid pipe has a second receiving hole spaced at a second preset distance. Each second receiving hole contains a measuring electrode. Multiple measuring electrodes are connected in series and then connected to the measuring control host through the second cable. The second PVC rigid pipe has a third receiving hole spaced at a third preset distance on the side away from the measuring control host. Each third receiving hole contains a temperature probe. Multiple temperature probes are connected in series and then connected to the measuring control host through the third cable.

[0009] Optionally, the first preset distance and the second preset distance are 1m.

[0010] Optionally, the number of the first receiving hole and the number of the second receiving hole are both 30.

[0011] Optionally, the third preset distance is 0.2m.

[0012] Optionally, the number of the third receiving holes is 14.

[0013] Optionally, the openings of the first receiving hole, the second receiving hole, and the third receiving hole are provided with PVC adhesive.

[0014] Optionally, the measurement control host is provided with a waterproof housing.

[0015] Optionally, the first PVC rigid pipe and the second PVC rigid pipe are arranged symmetrically.

[0016] Optionally, the measurement control host is connected to a remote computer.

[0017] Optionally, all power supply electrodes, all measuring electrodes, and all temperature probes are of the same model.

[0018] Compared with existing technologies, the beneficial effects of the technical solution provided in this application are as follows: This application provides a long-term dynamic monitoring device for temperature and humidity fields at key locations of landslides in permafrost regions. The device connects a measurement control host, a first PVC rigid pipe, and a second PVC rigid pipe via a cable. The first PVC rigid pipe has first receiving holes spaced at a first preset distance, each containing a power supply electrode. Multiple power supply electrodes are connected in series and then connected to the measurement control host via a first cable. The second PVC rigid pipe is arranged parallel to the first PVC rigid pipe, and has second receiving holes spaced at a second preset distance, each containing a measurement electrode. The measurement electrodes are connected in series and then connected to the measurement control host via a second cable. The second PVC rigid pipe has third receiving holes spaced at a third preset distance, each containing a temperature probe. The temperature probes are connected in series and then connected to the measurement control host via a third cable. By supporting the corresponding electrodes and temperature probes with two PVC rigid pipes, the device allows for long-term underground burial. Based on indoor geotechnical tests, the moisture content profile is converted into a resistivity profile, enabling in-situ dynamic long-term monitoring of soil moisture content and temperature at key landslide locations. The device is simple in structure, highly efficient, and reliable. By measuring soil temperature at different depths at key locations along the leading and trailing edges of the landslide, the spatiotemporal variation patterns of soil temperature were obtained, which greatly aids in subsequent analysis of the freeze-thaw state and daily freeze-thaw cycle process at different parts of the landslide. Simultaneously, the obtained moisture content profile data helps analyze the water infiltration process at key locations of the landslide under rainfall conditions. Furthermore, by jointly comparing soil temperature monitoring data and moisture content profile data, the analysis of water infiltration at key locations of the landslide under freeze-thaw conditions can be further enhanced, yielding multiple benefits. Attached Figure Description

[0019] Figure 1 This application provides a schematic diagram illustrating the application scenario of a long-term dynamic monitoring device for temperature and humidity fields at key locations of landslides in permafrost regions.

[0020] Figure 2 This application provides a schematic diagram of the structure of a long-term dynamic monitoring device for temperature and humidity fields at key locations of landslides in permafrost areas.

[0021] Figure 3 This is an enlarged schematic cross-sectional view of the second PVC rigid pipe section structure provided in the embodiments of this application;

[0022] Figure 4 A schematic diagram illustrating the functional relationship between resistivity and moisture content provided in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the data processing process of the monitoring equipment provided in the embodiments of this application. Detailed Implementation

[0024] The embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0026] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0027] The accompanying drawings show some block diagrams and / or flowcharts. It should be understood that some blocks or combinations thereof in the block diagrams and / or flowcharts can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when executed by the processor, these instructions can create means for implementing the functions / operations described in these block diagrams and / or flowcharts.

[0028] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram illustrating the application scenario of a long-term dynamic monitoring device for temperature and humidity fields at key locations of landslides in permafrost regions, provided in an embodiment of this application. Two boreholes, 1 and 2, are arranged at the leading edge of the landslide, with a first PVC rigid pipe and a second PVC rigid pipe placed inside each borehole. A measurement and control host 5 is placed between the two boreholes, constituting the first monitoring device. Two boreholes, 3 and 4, are arranged at the trailing edge of the landslide, with a first PVC rigid pipe and a second PVC rigid pipe placed inside each borehole. The measurement and control host 5 is placed between the two boreholes, constituting the second monitoring device. Both monitoring devices are of the same type and have the same parameters. The first monitoring device is used for monitoring the leading edge of the landslide; the second monitoring device is used for monitoring the trailing edge of the landslide. It should be noted that 6 represents the landslide overburden, 7 represents the potential sliding surface, and 8 represents the bedrock.

[0029] In some embodiments, please refer to Figure 2 , Figure 2A schematic diagram of the structure of the long-term dynamic monitoring device for temperature and humidity fields at key locations of landslides in permafrost areas provided in this application embodiment; the long-term dynamic monitoring device for temperature and humidity fields at key locations of landslides in permafrost areas provided in this application embodiment includes:

[0030] The measurement control host 5 is connected to a first PVC rigid pipe 91 and a second PVC rigid pipe 92 via a cable. The first PVC rigid pipe 91 has first receiving holes spaced at a first preset distance, and each first receiving hole contains a power supply electrode 10; multiple power supply electrodes 10 are connected in series and then connected to the measurement control host 5 via a first cable 11.

[0031] The second PVC rigid tube 92 is arranged parallel to the first PVC rigid tube 91. The second PVC rigid tube 92 has second receiving holes spaced at a second preset distance, each containing a measuring electrode 12. Multiple measuring electrodes 12 are connected in series to the measurement control host 5 via a second cable 13. On the side of the second PVC rigid tube 92 away from the measurement control host 5, a third receiving hole is provided at a third preset distance, each containing a temperature probe 14. Multiple temperature probes 14 are connected in series to the measurement control host 5 via a third cable 15. (See reference here.) Figure 3 , Figure 3 This is an enlarged schematic cross-sectional view of the second PVC rigid pipe section provided in an embodiment of this application.

[0032] In some embodiments, the first preset distance and the second preset distance are 1m.

[0033] In some embodiments, the number of first receiving holes and the number of second receiving holes are both 30.

[0034] In some embodiments, the third preset distance is 0.2m.

[0035] In some embodiments, the number of third receiving holes is 14.

[0036] In some embodiments, the openings of the first receiving hole, the second receiving hole, and the third receiving hole are provided with PVC adhesive.

[0037] In some embodiments, the measurement control host is provided with a waterproof housing 16.

[0038] In some embodiments, the first PVC rigid pipe and the second PVC rigid pipe are arranged symmetrically.

[0039] In some embodiments, the measurement control host and a remote computer are connected.

[0040] In some embodiments, the power supply electrodes are all of the same model, the measuring electrodes are all of the same model, and the temperature probes are all of the same model.

[0041] In one optional embodiment, holes are drilled at 1-meter intervals along the vertical direction of the first PVC rigid pipe 91 near the rear edge of the landslide. The diameter of the first receiving hole is slightly larger than that of the power supply electrode 10. The power supply electrode 10 passes through the first receiving hole, and the opening is sealed with PVC adhesive to fix the power supply electrode 10 in the first receiving hole. There are 30 power supply electrodes 10, arranged sequentially from top to bottom, numbered A1 to A30. The tail of the power supply electrode 10 is connected to the measurement control host 5 with the first cable 11. Holes are drilled at 1-meter intervals along the vertical direction of the second PVC rigid pipe 92 near the front edge of the landslide. The diameter of the second receiving hole is slightly larger than that of the measuring electrode 12. The measuring electrode 12 passes through the second receiving hole, and the opening is sealed with PVC adhesive to fix the measuring electrode 12 in the second receiving hole. There are 30 measuring electrodes 12, arranged sequentially from top to bottom, numbered M1 to M30. The tail of the measuring electrode 12 is connected to the measurement control host 5 with the second cable 13. Based on this, drilling was also performed on the symmetrical side of the second PVC rigid pipe 92 near the landslide edge, with holes spaced 0.2m apart. The diameter of the third receiving hole was slightly larger than that of the temperature probe 14. The temperature probe 14 was passed through the third receiving hole, and the opening was sealed with PVC adhesive to fix the temperature probe 14 in the third receiving hole. Specifically, there are 14 temperature probes 14 in total, used to measure the temperature of the soil from the surface to within 3m underground. The tail of the temperature probe 14 was connected to the measurement control host 5 using the third cable 15. Considering that the system needs to be used for long-term field observation, a waterproof shell 16 was added to the outside of the measurement control host 5.

[0042] In an alternative embodiment, see again Figures 1-3 Monitoring using the long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas provided in the above embodiments may include the following steps:

[0043] S1. After assembling the first PVC rigid pipe 91, the second PVC rigid pipe 92, the power supply electrode 10, the first cable 11, the measuring electrode 12, the second cable 13, and the temperature probe 14, a certain thickness of undisturbed soil needs to be applied to the outside of the power supply electrode 10, the measuring electrode 12, and the temperature probe 14. The undisturbed soil sample is taken from the corresponding boreholes and then placed into boreholes 1 and 2 (the operation for boreholes 3 and 4 is exactly the same). Connect the first cable 11, the second cable 13, and the third cable 15 to the measurement control host 5 respectively. After connecting the cables, backfill with undisturbed soil and compact it to a certain extent to ensure that the power supply electrode 10, the measuring electrode 12, and the temperature probe 14 are in full contact with the soil. After completing these steps, seal the borehole openings.

[0044] S2. Before measurement, connect the solar cell to the measurement control host 5, and then connect the measurement control host 5 to the remote computer via the network.

[0045] S3. The electrode movement of the power supply electrode 10 and measuring electrode 12 is controlled remotely by a computer. Specifically, the electrode movement adopts a unipolar-unipolar mode. The steps are as follows: First, keep the measuring electrode 12 stationary, starting from electrode M1; power the power supply electrode 10 one by one from top to bottom (A1-A30) starting from electrode A1, and record the potential of M1 and the current in the total circuit, etc.; then change the measuring electrode 12 from M1 to M2, and power the power supply electrode 10 again one by one from top to bottom (A1-A30) starting from electrode A1, and record the potential of M2 and the current in the total circuit, etc., and so on, until M30. Therefore, a single profile measurement yields 30×30=900 sets of raw recorded data.

[0046] S3.1 When performing cross-hole resistivity CT measurements on boreholes 1 and 2, cross-hole resistivity CT measurements are not performed on boreholes 3 and 4. This is because if resistivity is measured simultaneously on both boreholes, mutual interference between electric fields may occur, potentially affecting the results. Therefore, the time interval between cross-hole resistivity CT measurements on boreholes 1 and 2 and on boreholes 3 and 4 is set to 1 hour. Thus, 900 sets of raw data records (obtained from one cross-section measurement) can be obtained from boreholes 1 and 2 every 2 hours, and the same applies to boreholes 3 and 4.

[0047] S3.2 The soil temperature measurement interval is 1 hour, and the soil temperature measurements in boreholes 1 and 3 are carried out simultaneously. The measurement intervals mentioned in S3.1 and S3.2 are implemented by setting the corresponding program in the computer.

[0048] S4, Reference Figure 4 , Figure 4 This is a schematic diagram of the resistivity-moisture content function provided in the embodiments of this application; the geotechnical test is carried out in the laboratory, specifically by preparing undisturbed soil samples with different moisture contents, measuring the resistivity of the samples under different moisture contents in the laboratory, and fitting the resistivity-moisture content relationship applicable to the study area based on the measurement data.

[0049] S5, Reference Figure 5 , Figure 5 This is a schematic diagram of the data processing process of the monitoring equipment provided in this application embodiment; based on the fitted resistivity-moisture content relationship, the resistivity profile obtained after two-dimensional inversion is converted into a moisture content profile. This step is implemented by setting up a corresponding program on a computer.

[0050] S6, Continue to refer to Figure 5By organically combining transpore resistivity CT measurement, temperature measurement, indoor geotechnical testing, and computer remote control technologies, in-situ dynamic long-term monitoring of soil moisture profiles and temperature at key landslide locations was achieved. By understanding the distribution of moisture and the spatiotemporal variation of soil temperature at key landslide locations during rainfall and permafrost thawing, further in-depth analysis of water infiltration and freeze-thaw processes in permafrost regions can be conducted, providing technical support for research on the deformation and failure mechanisms of landslides in permafrost areas.

[0051] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this application can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, the features described in the various embodiments and / or claims of this application can be combined and / or combined in various ways without departing from the spirit and teachings of this application. All such combinations and / or combinations fall within the scope of this application. Therefore, the scope of this application should not be limited to the above embodiments, but should be defined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A long-term dynamic monitoring device for temperature and humidity fields at key locations of landslides in permafrost regions, characterized in that, include: Measurement control host; the measurement control host is connected to a first PVC rigid pipe and a second PVC rigid pipe via a cable; The first PVC rigid pipe is provided with first receiving holes spaced at a first preset distance, and each first receiving hole contains a power supply electrode; The multiple power supply electrodes are connected in series and then connected to the measurement and control host via a first cable; The second PVC rigid pipe is arranged parallel to the first PVC rigid pipe. The second PVC rigid pipe has a second receiving hole at a second preset distance. Each second receiving hole contains a measuring electrode. Multiple measuring electrodes are connected in series and then connected to the measuring control host through a second cable. The second PVC rigid pipe has a third receiving hole at a third preset distance on the side away from the measuring control host. Each third receiving hole contains a temperature probe. Multiple temperature probes are connected in series and then connected to the measuring control host through a third cable.

2. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The first preset distance and the second preset distance are 1m.

3. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The number of the first receiving hole and the number of the second receiving hole are both 30.

4. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The third preset distance is 0.2m.

5. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The number of the third receiving holes is 14.

6. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The openings of the first receiving hole, the second receiving hole, and the third receiving hole are provided with PVC adhesive.

7. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The measurement and control host is equipped with a waterproof casing.

8. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The first PVC rigid pipe and the second PVC rigid pipe are arranged symmetrically.

9. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, The measurement control host is connected to a remote computer.

10. The long-term dynamic monitoring equipment for temperature and humidity fields at key locations of landslides in permafrost areas according to claim 1, characterized in that, All power supply electrodes, all measuring electrodes, and all temperature probes are of the same model.

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