Real-time monitoring device and monitoring method for three-dimensional stress of slip band soil

Abstract

The invention discloses a slip zone soil three-dimensional stress real-time monitoring device and monitoring method, and relates to the technical field of landslide geological disaster monitoring, the device comprises a slip surface three-dimensional stressmeter and a control terminal, the slip surface three-dimensional stressmeter comprises a mounting seat, a shell and a detection assembly, the mounting seat is arranged at the hole bottom of a slip body drill hole and is located on a bed rock, and the shell is arranged on the mounting seat; the shell is arranged on the mounting base, the detection assembly is arranged on the shell and comprises a plurality of soil pressure sensors and an inertia detection unit, the plurality of soil pressure sensors are located on the upper side of a bedrock surface, the plurality of soil pressure sensors are arranged in an included angle mode and monitor soil pressure in multiple directions, and the inertia detection unit monitors the Euler angle of the sliding surface three-dimensional stress meter; the control terminal is in communication connection with the sliding surface three-dimensional stress meter through a communication power supply cable; thus, the magnitude and direction of the three-dimensional stress of the slip band soil can be obtained, real-time detection of the stress state of the in-situ slip band soil is achieved, and the method has the multi-use-scene adaptation characteristic of field layout and model experiment application.

Description

Technical Field

[0001] The invention relates to the technical field of landslide geological disaster monitoring, and in particular to a real-time monitoring device and method for three-dimensional stress of sliding zone soil. Background Art

[0002] The sliding zone is a key position in the evolution of landslides, and its development, penetration, weakening and other evolution processes are closely related to the stability of landslides. Due to its special location, the in-situ monitoring of the strength of sliding zone soil usually faces many challenges in terms of monitoring content and layout. On the one hand, during the sliding process of landslides, the stress state distribution of sliding zone soil is spatially three-dimensional, and different landslide movement modes are also accompanied by different principal stress directions and slight changes in magnitude. At present, due to technical limitations, there is still no real-time three-dimensional stress monitoring device suitable for sliding zone soil, and conventional soil pressure boxes can only obtain planar soil pressure data, and soil strength and deformation three-dimensional stress monitoring devices such as three-dimensional soil pressure boxes used in foundations and foundation pits cannot be applied to the in-situ strong shear environment of landslides; on the other hand, the deep monitoring layout of landslides that relies on drilling greatly limits the size of sliding zone soil strength monitoring equipment, requiring great integration and reliable data transmission methods. Summary of the invention

[0003] The main purpose of the present invention is to provide a real-time monitoring device and method for three-dimensional stress of sliding zone soil, which can obtain the magnitude and direction data of the principal stress of sliding zone soil in an in-situ environment.

[0004] To achieve the above object, the present invention provides a real-time monitoring device for three-dimensional stress of sliding zone soil, comprising:

[0005] A real-time monitoring device for three-dimensional stress of sliding zone soil, characterized in that the real-time monitoring device for three-dimensional stress of sliding zone soil comprises:

[0006] A sliding surface three-dimensional stress gauge, comprising a mounting seat, a housing and a detection assembly, wherein the mounting seat is used to be arranged at the bottom of a hole drilled in a sliding body and is located on bedrock, the housing is arranged on the mounting seat, the detection assembly is arranged on the housing, and comprises a plurality of earth pressure sensors and an inertial detection unit, wherein the plurality of earth pressure sensors are located on the upper side of the bedrock surface, and the plurality of earth pressure sensors are arranged at an angle to monitor earth pressure in multiple directions, and the inertial detection unit is used to monitor the Euler angle of the sliding surface three-dimensional stress gauge; and,

[0007] The control terminal is communicatively connected with the sliding surface three-dimensional stress gauge via a communication power supply cable.

[0008] Furthermore, the housing is arranged in a hexagonal pyramid shape;

[0009] The detection assembly includes seven soil pressure sensors, one of which is arranged on the upper side wall of the shell, and the other six of the seven soil pressure sensors are arranged on six peripheral side walls of the shell.

[0010] Furthermore, the angle between the normal line of the peripheral side wall of the shell and the vertical direction is greater than or equal to 5° and less than or equal to 90°.

[0011] Furthermore, the angle between the normal line of the peripheral side wall of the housing and the vertical direction is 45°;

[0012] The angle between the normal line of the upper side wall of the shell and the vertical direction is 0°.

[0013] Furthermore, the housing includes a base and a housing body, the base is arranged on the mounting seat, the housing body cover is arranged on the base to form an accommodating space, and the housing body is provided with a socket opening;

[0014] The soil pressure sensor is arranged on the shell body, and the inertia detection unit is arranged in the accommodating space;

[0015] The sliding surface three-dimensional stress gauge also includes:

[0016] A PCB board is fixedly mounted on the base;

[0017] An AD converter is disposed on the PCB board and is electrically connected to the plurality of soil pressure sensors and the PCB board;

[0018] a microprocessor, disposed on the PCB board and electrically connected to the AD converter; and

[0019] An aviation socket is arranged at the socket port and is electrically connected to the PCB board and the communication power supply cable.

[0020] Furthermore, the real-time monitoring device for three-dimensional stress of sliding zone soil also includes a fixed sleeve, which is used to be inserted into the borehole and abut against the inner wall of the borehole.

[0021] The present invention also provides a real-time monitoring method for three-dimensional stress of sliding belt soil, which is applicable to a real-time monitoring device for three-dimensional stress of sliding belt soil. The real-time monitoring method for three-dimensional stress of sliding belt soil comprises the following steps:

[0022] Step S1, survey the landslide on site, determine the monitoring position of the sliding surface, and determine the monitoring position of the sliding belt soil corresponding to the construction drilling;

[0023] Step S2, placing the sliding surface three-dimensional stress gauge into the drill hole, fixing the mounting base of the sliding surface three-dimensional stress gauge in the bedrock, and arranging the detection component of the sliding surface three-dimensional stress gauge on the upper side of the bedrock surface;

[0024] Step S3, driving the soil at the sliding surface monitoring position to collapse;

[0025] Step S4, starting the sliding surface three-dimensional stress meter, detecting and obtaining a plurality of soil pressure data and Euler angle data through the detection component, and transmitting the data to the control terminal for analysis and calculation to obtain a real-time three-dimensional stress vector of the sliding zone soil.

[0026] Furthermore, the step S4 specifically includes:

[0027] Step S41, starting the sliding surface three-dimensional stress gauge;

[0028] Step S42, obtaining a plurality of soil pressure data by detecting a plurality of soil pressure sensors in the detection assembly, and obtaining Euler angle data of the sliding surface three-dimensional stress gauge by detecting a plurality of soil pressure sensors in the detection assembly;

[0029] Step S43, obtaining the rotation angle and rotation direction of the sliding surface three-dimensional stress gauge based on the detected Euler angle data, and combining the plurality of soil pressure data to calculate the real-time three-dimensional stress vector of the sliding zone soil according to the stress vector calculation formula.

[0030] Furthermore, the stress vector calculation formula is:

[0031]

[0032] Where, {l, m, n} is the normal vector of the plane where each soil pressure sensor is located;

[0033] σ Ⅰ , σ Ⅱ , σ Ⅲ , σ Ⅳ , σ Ⅴ , σ Ⅵ , σ Ⅶ The soil pressure data detected by each soil pressure sensor;

[0034] σ x , σ y , σ z is the normal stress of sliding zone soil in the x, y, and z directions;

[0035] τ xy , τ yz , τ zx is the shear stress of sliding zone soil on plane xy, plane yz, and plane zx;

[0036] σ n are the three principal stresses of sliding zone soil;

[0037] ( x , y ,z ) is the real-time three-dimensional principal stress direction vector of sliding zone soil.

[0038] In the technical solution of the present invention, the sliding surface three-dimensional stress gauge is placed in the sliding body borehole, and its mounting seat is arranged on the bedrock, and multiple soil pressure sensors are arranged on the upper side of the bedrock surface. After the soil at the sliding surface of the sliding body collapses, the soil pressure data in multiple directions are obtained by detecting multiple soil pressure sensors, and the rotation angle and rotation direction of the sliding surface three-dimensional stress gauge obtained by combining the Euler angle data detected by the inertial detection unit are obtained. After processing and calculation by the control terminal, the size and direction of the three-dimensional stress of the sliding zone soil are obtained, thereby realizing real-time detection of the in-situ sliding zone soil stress state and providing key mechanical parameters for the deformation and stability analysis of the sliding zone soil; and the structural design of the sliding surface three-dimensional stress gauge can provide a reliable, stable and waterproof underground monitoring environment for the soil pressure sensor and the inertial detection unit, and has the adaptability to multiple usage scenarios of field deployment and model experiment application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0040] Figure 1 A cross-sectional view of an embodiment of a real-time monitoring device for three-dimensional stress of sliding zone soil provided by the present invention arranged in a sliding body;

[0041] Figure 2 for Figure 1 Schematic diagram of some structures of the real-time monitoring device for three-dimensional stress of soil in sliding zone;

[0042] Figure 3 for Figure 1 Schematic diagram of the structure of the real-time monitoring device for the three-dimensional stress of the soil in the sliding zone arranged inside the sliding body;

[0043] Figure 4 A flow chart of the method for real-time monitoring of three-dimensional stress of sliding zone soil provided by the present invention;

[0044] Figure 5 for Figure 4 Flow chart of step S4;

[0045] Figure 6 This is a measurement principle diagram of the real-time monitoring method for three-dimensional stress of sliding zone soil provided by the present invention.

[0046] Description of Figure Numbers:

[0047]

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The sliding zone is a key position in the evolution of landslides, and its development, penetration, weakening and other evolution processes are closely related to the stability of landslides. Due to its special location, the in-situ monitoring of the strength of sliding zone soil usually faces many challenges in terms of monitoring content and layout. On the one hand, during the sliding process of landslides, the stress state distribution of sliding zone soil is spatially three-dimensional, and different landslide movement modes are also accompanied by different principal stress directions and slight changes in magnitude. At present, due to technical limitations, there is still no real-time three-dimensional stress monitoring device suitable for sliding zone soil, and conventional soil pressure boxes can only obtain planar soil pressure data, and soil strength and deformation three-dimensional stress monitoring devices such as three-dimensional soil pressure boxes used in foundations and foundation pits cannot be applied to the in-situ strong shear environment of landslides; on the other hand, the deep monitoring layout of landslides that relies on drilling greatly limits the size of sliding zone soil strength monitoring equipment, requiring great integration and reliable data transmission methods.

[0053] In view of this, the present invention provides a real-time monitoring device 100 for three-dimensional stress of sliding zone soil. Figures 1 to 3 This is an embodiment of a real-time monitoring device 100 for three-dimensional stress of sliding zone soil provided by the present invention.

[0054] See also Figures 1 to 3 The sliding zone soil three-dimensional stress real-time monitoring device 100 includes a sliding surface three-dimensional stress gauge 1 and a control terminal 2. The sliding surface three-dimensional stress gauge 1 includes a mounting seat 11, a shell 12 and a detection component 13. The mounting seat 11 is used to be arranged at the bottom of the hole 230 of the sliding body 200 and is located on the bedrock 210. The shell 12 is arranged on the mounting seat 11. The detection component 13 is arranged on the shell 12, including multiple soil pressure sensors 131 and an inertial detection unit 132. The multiple soil pressure sensors 131 are located on the upper side of the bedrock 210 surface, and the multiple soil pressure sensors 131 are arranged at an angle to monitor the soil pressure in multiple directions. The inertial detection unit 132 is used to monitor the Euler angle of the sliding surface three-dimensional stress gauge 1; the control terminal 2 is communicatively connected to the sliding surface three-dimensional stress gauge 1 through a communication power supply cable 3.

[0055] In the technical solution of the present invention, the sliding surface three-dimensional stress gauge 1 is placed in the borehole 230 of the sliding body 200, and its mounting seat 11 is arranged on the bedrock 210, and multiple soil pressure sensors 131 are arranged on the upper side of the bedrock 210. After the soil at the sliding surface 220 of the sliding body 200 collapses, the soil pressure data in multiple directions are detected by the multiple soil pressure sensors 131, and the rotation angle and rotation direction of the sliding surface three-dimensional stress gauge 1 are obtained by combining the Euler angle data detected by the inertial detection unit 132. After processing and calculation by the control terminal 2, the size and direction of the three-dimensional stress of the sliding zone soil are obtained, so as to realize real-time detection of the in-situ sliding zone soil stress state and provide key mechanical parameters for the deformation and stability analysis of the sliding zone soil; and the structural design of the sliding surface three-dimensional stress gauge 1 can provide a reliable, stable and waterproof underground monitoring environment for the soil pressure sensor 131 and the inertial detection unit 132, and has the adaptability to multiple usage scenarios of field deployment and model experiment application.

[0056] It should be noted that the external power source 5 is connected to the sliding surface three-dimensional stress gauge 1 through the communication power supply cable 3 to supply power to the sliding surface three-dimensional stress gauge 1. In addition, a battery is provided in the sliding surface three-dimensional stress gauge 1, and the battery can be used in emergency situations (for example, the sliding surface three-dimensional stress gauge 1 has poor contact with the communication power supply cable 3, etc.).

[0057] For further information, see Figure 2 In one embodiment of the present invention, the housing 12 is arranged in a hexagonal pyramid shape; the detection assembly 13 includes seven soil pressure sensors 131, one of the seven soil pressure sensors 131 is arranged on the upper side wall of the housing 12, and the other six of the seven soil pressure sensors 131 are arranged on the six peripheral side walls of the housing 12. In this way, the sliding surface three-dimensional stress meter 1 can detect and obtain soil pressure data in seven directions, wherein the soil pressure sensor 131 arranged on the upper side wall of the housing 12 can accurately detect soil pressure data in the vertical direction, and the six soil pressure sensors 131 arranged on the six peripheral side walls of the housing 12 can obtain six soil pressure data that do not interfere with each other.

[0058] It should be noted that, in the present invention, the height of the housing 12 can be adjusted according to the use environment, and is not higher than 10 cm in the model experiment, while the size should be increased in the field environment to facilitate placement on the upper side of the bedrock 210 surface.

[0059] Furthermore, the angle between the normal line of the peripheral side wall of the housing 12 and the vertical direction is greater than or equal to 5° and less than or equal to 90°. ° .

[0060] Furthermore, in one embodiment of the present invention, the angle between the normal line of the peripheral side wall of the housing 12 and the vertical direction is 45°. °The angle between the normal line of the upper side wall of the housing 12 and the vertical direction is 0 ° In this way, it can be ensured that the area of ​​the upper side wall of the housing 12 within a limited height is substantially consistent with the area of ​​the six peripheral side walls, thereby reducing the influence of the contact area on the detection result.

[0061] It should be noted that the normal line of the peripheral side wall of the housing 12 and the normal line of the upper side wall of the housing 12 are the normal lines of the pressure surfaces of the soil pressure sensors 131 , and the positive direction of the normal lines is the pressure direction.

[0062] For details, please refer to Figure 2 The shell 12 includes a base 121 and a shell body 122, the base 121 is arranged on the mounting seat 11, the shell body 122 is covered on the base 121 to form an accommodating space, and the shell body 122 is provided with a socket port 1221; the soil pressure sensor 131 is arranged on the shell body 122, and the inertial detection unit 132 is arranged in the accommodating space; the sliding surface three-dimensional stress meter 1 also includes a PCB board 14, an AD converter 15, a microprocessor 16 and an aviation socket 17, the PCB board 14 is fixedly mounted on the base 121; the AD converter 15 is arranged on the PCB board 14, and is electrically connected to the plurality of soil pressure sensors 131 and the PCB board 14; the microprocessor 16 is arranged on the PCB board 14, and is electrically connected to the AD converter 15; the aviation socket 17 is arranged at the socket port 1221, and is electrically connected to the PCB board 14 and the communication power supply cable 3. In this way, the analog signal detected by each soil pressure sensor 131 is converted into a digital signal by the AD converter 15, and transmitted to the microprocessor 16 together with the Euler angle data detected by the inertial detection unit 132, and then transmitted to the control terminal 2 for processing and calculation to obtain the three-dimensional real-time stress of the sliding zone soil.

[0063] It should be noted that, in one embodiment of the present invention, the AD unit has 8 channels and a 24-bit resolution.

[0064] It should also be noted that the aviation socket 17 has waterproof and dustproof functions and is used to connect the communication power supply cable 3.

[0065] For further information, see Figure 2 The PCB board 14 is fixedly mounted on the base 121 through a plurality of copper pillars 18 .

[0066] Furthermore, the base 121 and the shell body 122 are threadedly connected.

[0067] For details, please refer to Figure 1The sliding zone soil three-dimensional stress real-time monitoring device 100 also includes a fixed sleeve 4, which is used to be inserted into the borehole 230 and abut against the inner wall of the borehole 230. In this way, after the sliding body 200 drills the hole 230, the fixed sleeve 4 is inserted into the borehole 230 to ensure the stability of the borehole 230; after the sliding surface three-dimensional stress gauge 1 is arranged, the fixed sleeve 4 is taken out from the borehole 230, so that the soil at the sliding surface 220 position collapses, and the sliding surface three-dimensional stress gauge 1 starts to monitor the three-dimensional real-time stress of the sliding zone soil.

[0068] The present invention also provides a method for real-time monitoring of three-dimensional stress of sliding zone soil, which is applicable to the above-mentioned real-time monitoring device for three-dimensional stress of sliding zone soil, see Figure 4 The method for real-time monitoring of three-dimensional stress of sliding zone soil comprises the following steps:

[0069] Step S1, survey the landslide on site, determine the monitoring position of the sliding surface, and determine the monitoring position of the sliding belt soil corresponding to the construction drilling hole.

[0070] In this step, the borehole is drilled to a depth of 0.5 m below the bedrock surface, and a fixed casing is laid to maintain the stability of the borehole.

[0071] Step S2, placing the sliding surface three-dimensional stress gauge into the drill hole, fixing the mounting base of the sliding surface three-dimensional stress gauge in the bedrock, and arranging the detection component of the sliding surface three-dimensional stress gauge on the upper side of the bedrock surface.

[0072] In this step, the sliding surface three-dimensional stress gauge is connected to the control terminal and the power supply through a communication power supply cable and then placed in the drill hole.

[0073] Step S3: driving the soil at the sliding surface monitoring position to collapse.

[0074] In this step, the fixed casing is pulled out from the borehole, and the soil at the sliding surface monitoring position loses the support of the fixed casing, collapses, and presses against the sliding surface three-dimensional stress gauge.

[0075] Step S4, starting the sliding surface three-dimensional stress meter, detecting and obtaining a plurality of soil pressure data and Euler angle data through the detection component, and transmitting the data to the control terminal for analysis and calculation to obtain a real-time three-dimensional stress vector of the sliding zone soil.

[0076] For further information, see Figure 5 , the step S4 specifically includes:

[0077] Step S41, starting the sliding surface three-dimensional stress gauge.

[0078] Step S42: obtaining a plurality of soil pressure data by detecting the plurality of soil pressure sensors in the detection assembly, and obtaining the Euler angle data of the sliding surface three-dimensional stress gauge by detecting the inertial detection unit in the detection assembly.

[0079] In a specific embodiment of the present invention, the housing is arranged in a hexagonal pyramid shape, and the detection assembly includes seven earth pressure sensors, one of the seven earth pressure sensors is arranged on the upper side wall of the housing, and the other six of the seven earth pressure sensors are arranged on the six peripheral side walls of the housing, so that seven earth pressure data σ can be detected. Ⅰ , σ Ⅱ , σ Ⅲ , σ Ⅳ , σ Ⅴ , σ Ⅵ , σ Ⅶ , the Euler angle data includes a roll angle a, a pitch angle b, and a yaw angle c.

[0080] Step S43, obtaining the rotation angle and rotation direction of the sliding surface three-dimensional stress gauge based on the detected Euler angle data, and combining the plurality of soil pressure data to calculate the real-time three-dimensional stress vector of the sliding zone soil according to the stress vector calculation formula.

[0081] Specifically, considering the symmetry of shear stress, the stress state σ at a point in the sliding zone soil can be represented by six independent stress components, including three normal stress components σ x , σ y , σ z and 3 shear stresses τ xy , τ yz , τ zx , acting on different faces of the tiny cubic unit respectively, and the principal stress and its direction can be derived from these stress components.

[0082] Furthermore, the stress vector calculation formula is:

[0083]

[0084] Where, {l, m, n} is the normal vector of the plane where each soil pressure sensor is located;

[0085] σ Ⅰ , σ Ⅱ , σ Ⅲ , σ Ⅳ , σ Ⅴ , σ Ⅵ , σ Ⅶ The soil pressure data detected by each soil pressure sensor;

[0086] σ x , σ y , σz is the normal stress of sliding zone soil in the x, y, and z directions;

[0087] τ xy , τ yz , τ zx is the shear stress of sliding zone soil on plane xy, plane yz, and plane zx;

[0088] σ n are the three principal stresses of sliding zone soil;

[0089] ( x , y , z ) is the real-time three-dimensional principal stress direction vector of sliding zone soil.

[0090] First, the normal vector {l, m, n} of the plane where the earth pressure sensor is located is:

[0091]

[0092] See also Figure 6 , establish a rectangular coordinate system, ψ is the angle between the plane normal OP (the normal of the peripheral side wall of the shell or the normal of the upper side wall of the shell) and the vertical z-axis; It is the angle between OQ (the projection of the plane normal OP on the XOY plane) and the x-axis.

[0093] More specifically, in a specific embodiment of the present invention, the sliding surface three-dimensional stress gauge has seven earth pressure sensors, and it can be obtained The corresponding angles are 90°, 180°, -120°, -60°, 0°, 60°, and 120° respectively.

[0094] Furthermore, the normal vectors of the planes where the seven earth pressure sensors are located are: Ⅰ =0,m Ⅰ =0,n Ⅰ =0},

[0095] Further, we can get:

[0096]

[0097] In this way, the principal stress values ​​σ of the sliding zone soil in the x-axis, y-axis, and z-axis directions of the soil pressure sensor can be calculated. x , σ y , σ z , as well as the shear stresses in the three planes xoy, yoz and zox.

[0098] Then by solving the characteristic equation Get σ n The three eigenvalues ​​σ1, σ2, and σ3 are the three principal stresses of sliding zone soil, among which σ1≥σ2≥σ3.

[0099] Further, according to The principal stress vector (υ x , y , z ), which is the real-time three-dimensional principal stress direction vector of sliding zone soil.

[0100] At the same time, the initial spatial state and the spatial position after installation of the three-dimensional strain gauge on the sliding surface will have a certain rotation deviation, and the magnitude and direction of the measured principal stress will have deviations. In order to correct these deviations, the rotation angle and rotation direction of the three-dimensional strain gauge on the sliding surface can be obtained according to the roll angle a, pitch angle b, and yaw angle c provided by the inertial measurement unit, and converted to the initial coordinates, the angle ψ between the original plane normal OP and the vertical z-axis is converted to ψ′, and the angle between OQ and the x-axis is converted to ψ′. Convert to Calculate and obtain the real-time three-dimensional stress magnitude and direction of the new sliding zone soil.

[0101] Specifically, the rotation matrix R around the x-axis is known x for:

[0102]

[0103] The rotation matrix R around the y axis y for:

[0104]

[0105] The rotation matrix R around the z axis Z for:

[0106]

[0107] Assuming that the sliding surface three-dimensional stress gauge rotates around the x-axis first, then around the y-axis, and finally around the z-axis, the combined rotation matrix R is: R = R z (c) R y (b) R x (a) R = R z (c) R y (b) R x (a).

[0108] For the initial position of the plane, the angle between the plane normal OP and the z-axis before rotation is ψ, and the angle between the plane normal OP and the x-axis is Then the initial normal vector is: n0=(n x , n y , nz ).

[0109] The normal vector after rotation is: Then calculate the angle between the plane normal OP and the x-axis after rotation for: The angle ψ′ between the plane normal OP and the z-axis after rotation is:

[0110] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A real-time monitoring device for three-dimensional stress of sliding zone soil, characterized in that: The sliding zone soil three-dimensional stress real-time monitoring device comprises: A sliding surface three-dimensional stress gauge, comprising a mounting seat, a housing and a detection assembly, wherein the mounting seat is used to be arranged at the bottom of a hole drilled in a sliding body and is located on bedrock, the housing is arranged on the mounting seat, the detection assembly is arranged on the housing, and comprises a plurality of earth pressure sensors and an inertial detection unit, wherein the plurality of earth pressure sensors are located on the upper side of the bedrock surface, and the plurality of earth pressure sensors are arranged at an angle to monitor earth pressure in multiple directions, and the inertial detection unit is used to monitor the Euler angle of the sliding surface three-dimensional stress gauge; and, The control terminal is communicatively connected with the sliding surface three-dimensional stress gauge via a communication power supply cable.

2. The real-time monitoring device for three-dimensional stress of sliding zone soil according to claim 1, characterized in that: The shell is arranged in a hexagonal pyramid shape; The detection assembly includes seven soil pressure sensors, one of which is arranged on the upper side wall of the shell, and the other six of the seven soil pressure sensors are arranged on six peripheral side walls of the shell.

3. The real-time monitoring device for three-dimensional stress of sliding zone soil according to claim 2, characterized in that: The angle between the normal line of the peripheral side wall of the shell and the vertical direction is greater than or equal to 5° and less than or equal to 90°.

4. The real-time monitoring device for three-dimensional stress of sliding zone soil according to claim 3, characterized in that: The angle between the normal line of the peripheral side wall of the housing and the vertical direction is 45°; The angle between the normal line of the upper side wall of the shell and the vertical direction is 0°.

5. The real-time monitoring device for three-dimensional stress of sliding zone soil according to claim 1, characterized in that: The housing comprises a base and a shell body, wherein the base is arranged on the mounting seat, and the shell body cover is arranged on the base to form an accommodating space, and the shell body is provided with a socket opening; The soil pressure sensor is arranged on the shell body, and the inertia detection unit is arranged in the accommodating space; The sliding surface three-dimensional stress gauge also includes: A PCB board is fixedly mounted on the base; An AD converter is disposed on the PCB board and is electrically connected to the plurality of soil pressure sensors and the PCB board; a microprocessor, disposed on the PCB board and electrically connected to the AD converter; and An aviation socket is arranged at the socket port and is electrically connected to the PCB board and the communication power supply cable.

6. The real-time monitoring device for three-dimensional stress of sliding zone soil according to claim 1, characterized in that: The real-time monitoring device for three-dimensional stress of sliding zone soil also includes a fixed sleeve, which is used to be inserted into the borehole and abut against the inner wall of the borehole.

7. A method for real-time monitoring of three-dimensional stress of sliding zone soil, applicable to the real-time monitoring device for three-dimensional stress of sliding zone soil as claimed in any one of claims 1 to 6, characterized in that: The method for real-time monitoring of three-dimensional stress of sliding zone soil comprises the following steps: Step S1, survey the landslide on site, determine the monitoring position of the sliding surface, and determine the monitoring position of the sliding belt soil corresponding to the construction drilling; Step S2, placing the sliding surface three-dimensional stress gauge into the drill hole, fixing the mounting base of the sliding surface three-dimensional stress gauge in the bedrock, and arranging the detection component of the sliding surface three-dimensional stress gauge on the upper side of the bedrock surface; Step S3, driving the soil at the sliding surface monitoring position to collapse; Step S4, start the sliding surface three-dimensional stress meter, detect and obtain multiple soil pressure data and Euler angle data through the detection component, and transmit them to the control terminal for analysis and calculation to obtain the real-time three-dimensional stress vector of the sliding belt soil.

8. The method for real-time monitoring of three-dimensional stress of sliding zone soil according to claim 7, characterized in that: The step S4 specifically includes: Step S41, starting the sliding surface three-dimensional stress gauge; Step S42, obtaining a plurality of soil pressure data by detecting a plurality of soil pressure sensors in the detection assembly, and obtaining Euler angle data of the sliding surface three-dimensional stress gauge by detecting an inertial detection unit in the detection assembly; Step S43, obtaining the rotation angle and rotation direction of the sliding surface three-dimensional stress gauge based on the detected Euler angle data, and combining the plurality of soil pressure data to calculate the real-time three-dimensional stress vector of the sliding zone soil according to the stress vector calculation formula.

9. The method for real-time monitoring of three-dimensional stress of sliding zone soil according to claim 8, characterized in that: The stress vector calculation formula is: Where, {l, m, n} is the normal vector of the plane where each soil pressure sensor is located; σ Ⅰ , σ Ⅱ , σ Ⅲ , σ Ⅳ , σ Ⅴ , σ Ⅵ , σ Ⅶ The soil pressure data detected by each soil pressure sensor; σ x , σ y , σ z is the normal stress of sliding zone soil in the x, y, and z directions; τ xy , τ yz , τ zx is the shear stress of sliding zone soil on plane xy, plane yz, and plane zx; σ n are the three principal stresses of sliding zone soil; ( x , y , z ) is the real-time three-dimensional principal stress direction vector of sliding zone soil.

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