In-situ landslide water content monitoring device and in-situ landslide water content monitoring method

Abstract

The embodiment of the application discloses a landslide water content in-situ monitoring device and a landslide water content in-situ monitoring method.The device comprises a conical barrel, a pressure detection device and an isolation protection piece; the pressure detection module is arranged in the shell; the isolation protection piece is arranged in the shell and placed on the pressure detection module; a soil loading space is formed between the conical barrel and the isolation protection piece; a plurality of water permeable holes are arranged on the side wall of the conical barrel.The device has simple structure, and can realize real-time monitoring of the soil water content in the landslide according to the definition of the soil water content.Compared with the test equipment and method such as the capacitive type, the ultrasonic type, the electromagnetic pulse type and the remote sensing type, the device does not need to establish a mathematical model of the soil water content and other sound, electric physical quantities, overcomes the deviation of the water content results caused by different particle components and mineral components of the soil, and provides strong support for the landslide monitoring and early warning and the landslide sliding mechanism research.

Description

Technical Field

[0001] This invention relates to the field of landslide monitoring technology, specifically to an in-situ monitoring device and method for landslide water content. Background Technology

[0002] In order to monitor landslide disasters, study the mechanisms of deformation and instability, predict the time of failure, and thus reduce loss of life and property, a large number of experts, scholars, and related personnel have conducted extensive landslide monitoring across the country, achieving fruitful results. Research has revealed that the water content within landslides has a significant impact on landslide instability.

[0003] Currently, the water content monitoring equipment used in landslide monitoring mostly uses an indirect method, such as ultrasonic waves or electrical resistance, to obtain the soil water content through mathematical models of changes in soil moisture content.

[0004] While these methods are more convenient and faster than drying, they are affected by factors such as soil particle composition, mineral composition, and groundwater pH. In particular, it is difficult to use the same mathematical model to determine the different parts of landslides with different rock types or with different material compositions in large landslides within the region.

[0005] Furthermore, even for soils with the same conditions, the correlation coefficient of the fitted mathematical model is difficult to reach 100%, and the obtained moisture content deviates to some extent from the actual moisture content. Summary of the Invention

[0006] In view of the shortcomings of the prior art, one aspect of the present invention discloses an in-situ monitoring device for the water content of landslide bodies.

[0007] The in-situ monitoring device for landslide water content includes a conical barrel, a pressure detection device, and an isolation protection component. The pressure detection device includes a housing and a pressure detection module. The pressure detection module is housed within the housing. The isolation protection component is housed within the housing and placed on top of the pressure detection module. The bottom of the conical barrel is sealed to the top of the housing, creating a soil-filling space between the conical barrel and the isolation protection component. Multiple permeable holes are provided on the side wall of the conical barrel.

[0008] According to a preferred embodiment of the present invention, the cone angle of the conical barrel is α; wherein, the cone angle α is 20° to 80°.

[0009] According to a preferred embodiment of the present invention, the conical barrel includes a frustum-shaped barrel body and a barrel lid; the barrel lid is detachably disposed on the top of the frustum-shaped barrel body; the water-permeable holes are uniformly disposed on the frustum-shaped barrel body; the diameter of the water-permeable holes is 0.5 to 1 mm.

[0010] According to a preferred embodiment of the present invention, the isolation protection element includes a protective box.

[0011] According to a preferred embodiment of the present invention, the isolation protective element further includes an elastic protective membrane; the detection rod of the pressure detection module passes through the protective box, and the top of the detection rod is flush with the top of the protective box; the protective box is filled with lubricant. The elastic protective membrane is disposed on the top surface of the detection rod.

[0012] According to a preferred embodiment of the present invention, the gap between the isolation protective member and the housing is sealed by a sealing structure.

[0013] According to a preferred embodiment of the present invention, the pressure detection module is a pressure sensor.

[0014] According to a preferred embodiment of the present invention, both the conical barrel and the isolation protection element are made of corrosion-resistant material.

[0015] Another aspect of the present invention discloses an in-situ monitoring method for the water content of landslide bodies.

[0016] The in-situ monitoring method for water content of landslide bodies includes the following steps:

[0017] Step (a): Dig an installation pit on the landslide body to be monitored; divide the excavated soil into two parts with masses m1 and m2 respectively; wherein, the soil with mass m1 should be sufficient to fill the soil filling space in the landslide body water content in-situ monitoring device as described above.

[0018] Step (b): Soil of mass m1 is layered and filled into the soil-filling space; then, the landslide water content in-situ monitoring device is placed in the installation pit and the installation pit is filled in, so that the landslide water content in-situ monitoring device is buried in the monitored landslide; wherein, the signal power line of the pressure detection module in the landslide water content in-situ monitoring device is led out to the ground.

[0019] Step (c) involves drying a soil sample of mass m² and then weighing it. The mass of the dried soil sample is m. 2d The mass m of the dried soil with mass m1 is calculated using formula (1). 1d ;

[0020] m 1d =m1×m 2d / m2 (1);

[0021] Step (d): Using the real-time pressure F1 data of the soil above the landslide measured by the pressure detection module, the real-time water content ω of the monitored landslide body is calculated by formula (2).

[0022] ω=(F2-m 1d ·g) / (m 1d ·g) (2);

[0023] In formula (2), g is the acceleration due to gravity.

[0024] According to a preferred embodiment of the present invention, in step (b), after the soil of mass m1 is layered and filled into the soil-filling space, a gap is provided between the top surface of the soil in the conical bucket and the top of the conical bucket.

[0025] The in-situ monitoring device and method for landslide water content provided in this invention have at least one of the following technical effects:

[0026] 1. The landslide body water content in-situ monitoring device and method of the present invention are based on the drying method, which provides relatively accurate data and is less affected by external factors.

[0027] 2. The landslide body water content in-situ monitoring device and method of the present invention are simple to construct on site and can be combined with drilling, pit exploration, etc. The signal power line can be connected to a wireless transmission module to realize remote monitoring.

[0028] 3. The landslide body water content in-situ monitoring device and method of the present invention can be used not only for monitoring landslides in the field, but also for indoor landslide physical simulation tests and monitoring of soil slopes.

[0029] Some additional features of the present invention will be described in the following description. These additional features will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings, or upon understanding the production or operation of the embodiments. The features disclosed in this invention can be implemented and achieved through the practice or use of various methods, means, and combinations thereof with respect to the specific embodiments described below. Attached Figure Description

[0030] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same parts.

[0031] Figure 1 , Figure 2 , Figure 3 This is a schematic diagram of the structure of an in-situ monitoring device for landslide water content according to some embodiments of the present invention;

[0032] Figure 4This is a schematic diagram of the permeable hole structure in an in-situ monitoring device for landslide water content according to some embodiments of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that when the terms "first," "second," etc., are used in the specification, claims, and accompanying drawings of this invention, they are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, when the terms "comprising" and "having," and any variations thereof, are used, it is intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] In this invention, when terms such as "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" are used, they indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0037] Furthermore, in this invention, the terms "installation," "setting," "equipped with," "connection," "linking," and "sleeving," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] One embodiment of the present invention discloses an in-situ monitoring device for the water content of landslide bodies.

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, the in-situ monitoring device for the water content of the landslide body includes a cone-shaped barrel 100, a pressure detection device 200, and an isolation protection component 300.

[0041] The cone angle of the conical bucket 100 is α (90° - α / 2), which is greater than the angle of repose of the soil being monitored or its internal friction angle. This reduces the pressure between the soil inside the bucket and the bucket wall, thereby reducing friction and minimizing systematic errors. Furthermore, the inclined bucket wall facilitates the entry of external moisture into the bucket, which is beneficial for moisture content monitoring.

[0042] Preferably, the cone angle α of the conical barrel 100 can be set to 20° to 80°.

[0043] For example, the conical barrel 100 may include a frustoconical barrel body 110 and a lid 120. The lid 120 is detachably disposed on the top of the frustoconical barrel body 110. For example, the lid 120 may be detachably disposed on the top of the frustoconical barrel body 110 by means of a threaded connection structure or a snap-fit ​​connection structure.

[0044] Preferably, the frustum-shaped barrel body 110 and the lid 120 of the conical barrel 100 are both made of corrosion-resistant materials to prevent acidic or alkaline groundwater from corroding the monitoring device. For example, the frustum-shaped barrel body 110 and the lid 120 of the conical barrel 100 are both made of PVC material.

[0045] Furthermore, the thickness of the frustum-shaped barrel 110 and the lid 120 of the conical barrel 100 can be set as needed to ensure that the conical barrel 100 has sufficient rigidity to prevent deformation, enabling it to bear the weight of the upper soil and preventing deformation of the lid and other components from affecting the accuracy of moisture content measurement. For example, in some embodiments, the height of the conical barrel 100 can be set to 10–40 cm, the bottom diameter can be set to 10–40 cm, and the thickness can be set to 3–10 mm.

[0046] Multiple water-permeable holes 111 are provided on the side wall of the conical barrel 100, such as... Figure 1 , Figure 4 As shown. For example, the permeable holes 111 can be evenly arranged on the frustoconical barrel 110. By arranging the permeable holes 111 on the inclined barrel wall, it is beneficial for external moisture to enter the barrel, thereby facilitating the monitoring of moisture content.

[0047] Preferably, the diameter of the water-permeable hole 111 can be set to 0.5-1mm, which facilitates the entry of water and prevents large particles from entering the conical barrel and affecting the monitoring accuracy.

[0048] The pressure detection device 200 includes a housing 210 and a pressure detection module 220. The pressure detection module 220 is disposed inside the housing 210.

[0049] For example, the pressure detection module 220 may employ a pressure sensor.

[0050] The isolation protection component 300 is disposed within the housing 210 and placed on the pressure detection module 220. The gap between the isolation protection component 300 and the housing 210 is sealed by a sealing structure. For example, the gap between the isolation protection component 300 and the housing 210 can be sealed by a sealing structure formed by sealant or sealing rings.

[0051] The bottom of the conical barrel 100 is sealed to the top of the shell 210, thus creating a soil-filling space between the conical barrel 100 and the isolation protection member 300.

[0052] For example, in some embodiments, the isolation protection element 300 may be a protective box 310 or a protective plate. The gap between the protective box 310 or protective plate and the housing 210 may be sealed by a sealing structure formed by sealant or sealing rings.

[0053] Furthermore, in some embodiments, the isolation protection element 300 may also include an elastic protective membrane 320.

[0054] The detection rod 221 of the pressure detection module 220 passes through the protective box 310, with the top of the detection rod 221 flush with the top of the protective box 310. An elastic protective film 320 is provided on the top surface of the detection rod 221, forming a protective film between the pressure sensor and the soil to prevent corrosion of the pressure sensor. The elastic protective film 320 can be made of elastic plastic film. Additionally, the protective box 310 is filled with lubricant 330, which serves to waterproof and lubricate the detection rod of the pressure sensor. The lubricant can be grease or petroleum jelly.

[0055] Preferably, the isolation protection element 300 is made of a corrosion-resistant material to prevent acidic or alkaline groundwater from corroding the monitoring device. For example, the isolation protection element 300 can be made of PVC material.

[0056] Another invention of this invention discloses an in-situ monitoring method for the water content of landslide bodies.

[0057] The in-situ monitoring method for the water content of the landslide mass includes the following steps:

[0058] Step a: Dig an installation pit on the landslide body to be monitored. Divide the excavated soil into two portions with masses m1 and m2 respectively. The soil with mass m1 should be sufficient to fill the soil-filling space of the in-situ landslide water content monitoring device as described in any of the above embodiments.

[0059] Step b: Soil of mass m1 is layered and filled into the soil-filling space. Then, the landslide moisture content in-situ monitoring device is placed in the installation pit and the pit is filled in, so that the device is buried in the monitored landslide. The signal power line 230 of the pressure detection module in the landslide moisture content in-situ monitoring device is led out to the ground.

[0060] Step (c) involves drying a soil sample of mass m² and then weighing it. The mass of the dried soil sample is m. 2d The mass m of the dried soil with mass m1 is calculated using formula (1). 1d ;

[0061] m 2d =m2×m 2d / m2 (1);

[0062] Step (d): Using the real-time pressure F1 data of the soil above the landslide measured by the pressure detection module, the real-time water content ω of the monitored landslide body is calculated by formula (2).

[0063] ω=(F1-m 1d ·g) / (m 1d ·g) (2);

[0064] In formula (2), g is the acceleration due to gravity.

[0065] Preferably, in step (b), after the soil of mass m1 is layered and filled into the soil-filling space, a gap is provided between the top surface of the soil in the conical bucket and the top of the conical bucket. For example, the top surface of the soil in the conical bucket should preferably have a 1cm space between it and the bottom of the bucket lid to prevent the surrounding soil from squeezing the soil in the bucket and causing the measurement results to be distorted.

[0066] Specifically, the in-situ monitoring method for landslide water content according to this invention includes the following steps:

[0067] Step (a): As needed, use digging tools to dig a pit slightly larger than the in-situ monitoring device for water content of landslide body in the embodiment of the present invention at the corresponding location of the landslide, and divide the soil at the location where the device is buried into two parts for weighing, with the masses being m1 and m2 respectively, wherein the soil with a mass of m1 should be sufficient to fill the cone-shaped bucket.

[0068] Step (b): Soil of mass m1 is layered and filled into the conical bucket, and the bucket lid is closed. Then, the landslide water content in-situ monitoring device of the embodiment of the present invention is buried in the dug deep pit. The signal power line is led out to the ground for transmitting pressure data. Then, the deep pit is filled with soil.

[0069] Step (c): Take the soil with a mass of m2 back indoors, dry it, and then weigh it to get its mass m. 2d Through formula m 1d =m2×m 2d / m2 calculates the dried mass m of soil with mass m1. 1d ;

[0070] Step (d): Using the real-time soil pressure F1 data measured by the pressure sensor, the formula ω=(F1-m 2d ·g) / (m 2d The real-time water content of the monitored landslide can be calculated using the formula ω, where g is the gravitational acceleration and ω is the real-time water content of the monitored landslide.

[0071] In addition, to prevent the surrounding soil from squeezing the soil inside the bucket and causing inaccurate measurement results, the top surface of the soil contained in the conical bucket can be set to leave a 1cm gap between it and the bottom of the bucket lid (1).

[0072] The in-situ monitoring device and method for landslide water content in this invention are simple in design and monitor the soil water content within the landslide body in real time according to the definition of soil water content. Compared with testing equipment and methods such as capacitive, ultrasonic, electromagnetic pulse, and remote sensing, this invention does not require establishing mathematical models for soil water content and other acoustic and electrical physical quantities, overcoming the deviation in water content results caused by differences in soil particle composition and mineral composition. The results are accurate and reliable, providing strong support for landslide monitoring and early warning, as well as research on landslide sliding mechanisms.

[0073] It should be noted that all features disclosed in this specification, or all steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0074] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this invention, and these solutions all fall within the scope of this invention and its protection. Those skilled in the art should understand that this specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this invention is defined by the claims and their equivalents.

Claims

1. A method for in-situ monitoring of water content in a landslide mass, characterized by, It comprises the following steps: Step (a), digging an installation pit on the monitored landslide body; the excavated soil is divided into two parts with masses of m1 and m2; wherein the soil with mass of m1 is sufficient to fill the soil space in the landslide water content in-situ monitoring device; The landslide water content in-situ monitoring device comprises a conical barrel (100), a pressure detection device (200) and an isolation protection piece (300); The pressure detection device (200) comprises a shell (210) and a pressure detection module (220); the pressure detection module (220) is arranged in the shell (210); The isolation protection piece (300) is arranged in the shell (210) and placed on the pressure detection module (220); The bottom of the conical barrel (100) is sealingly connected with the top of the shell (210), so that a soil space is formed between the conical barrel (100) and the isolation protection piece (300); A plurality of water permeable holes (111) are arranged on the side wall of the conical barrel (100); Step (b), the soil with mass of m1 is layered filled into the soil space; then, the landslide water content in-situ monitoring device is placed in the installation pit and the installation pit is filled flat, so that the landslide water content in-situ monitoring device is buried in the monitored landslide body; wherein the signal power line (230) of the pressure detection module in the landslide water content in-situ monitoring device is led out to the ground outside; Step (c) : The soil with mass m2 is dried and weighed, and the dried mass is m 2d ; the dried mass m of the soil with mass m1 is calculated by formula (1) 1d ; （1）； Step (d), using the real-time pressure Fl data of the soil thereon measured by the pressure detection module, the real-time water content of the monitored landslide is calculated by formula (2) ; （2）； In formula (2), g is the acceleration of gravity.

2. The method for in-situ monitoring of water content in landslide mass according to claim 1, characterized in that, The conical angle of the conical barrel (100) is a; Wherein, (90°-a / 2) is greater than the angle of the natural repose angle or the internal friction angle of the monitoring soil body.

3. The method according to claim 2, wherein, The conical angle a of the conical barrel (100) is 20°-80°.

4. The method for in-situ monitoring of water content in landslide mass according to claim 1, characterized in that, The conical barrel (100) comprises a frustum type barrel body (110) and a barrel cover (120); the barrel cover (120) is detachably arranged on the top of the frustum type barrel body (110); The water permeable holes (111) are uniformly arranged on the frustum type barrel body (110); the aperture of the water permeable holes (111) is 0.5-1mm.

5. The method for in-situ monitoring of water content in landslide mass according to claim 1, characterized in that, The isolation protection piece (300) comprises a protection box (310).

6. The method for in-situ monitoring of water content in a landslide mass according to claim 5, characterized in that, The isolation protection piece (300) further comprises an elastic protection film (320); The detection rod (221) of the pressure detection module (220) is inserted in the protection box (310), and the top of the detection rod (221) is flush with the top of the protection box (310); The protection box (310) is filled with a lubricant (330); The elastic protection film (320) is arranged on the top surface of the detection rod (221).

7. The method for in-situ monitoring of water content in landslide mass according to claim 1, characterized in that, The gap between the isolation protection piece (300) and the shell (210) is sealed by a sealing structure.

8. The method for in-situ monitoring of water content in landslide mass according to claim 1, characterized in that, The pressure detection module (220) is a pressure sensor; The conical barrel (100) and the isolation protection piece (300) are both made of corrosion-resistant materials.

9. The landslide water content in-situ monitoring method according to claim 8, characterized in that, In the step (b), after the soil with mass of m1 is layered filled into the soil space, a gap is arranged between the top surface of the soil in the conical barrel and the top of the conical barrel.

Images