CN114216388A - Displacement correction method for dual-path nano sensor - Google Patents
Displacement correction method for dual-path nano sensor Download PDFInfo
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- CN114216388A CN114216388A CN202111419454.9A CN202111419454A CN114216388A CN 114216388 A CN114216388 A CN 114216388A CN 202111419454 A CN202111419454 A CN 202111419454A CN 114216388 A CN114216388 A CN 114216388A
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- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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Abstract
The invention discloses a displacement correction method of a double-path nano sensor, and provides a double-path method for correcting measured displacement based on a nano sensor and an earth surface displacement monitoring sensor. The slope displacement curve is corrected by innovatively combining the two paths, compared with the traditional scheme, the method has the advantages that data come from two sensors of different types, data sources are diversified, and the reliability is high. Under the condition that the sensor cannot accurately measure under the bad working condition (working condition two), the error generated by the sensor when the displacement is measured by the sensor can be corrected to the greatest extent, a slope deformation displacement curve can be provided, and the measuring efficiency and the reliability of the sensor are greatly improved. Meanwhile, a special indoor test device is designed for simulation experiment verification, and the accuracy of correcting and measuring displacement data is verified.
Description
Technical Field
The invention relates to the field of slope deformation monitoring, in particular to a displacement correction method of a double-path nano sensor.
Background
With the rapid development of national economic and technological levels, human engineering activities are more and more frequent, and the scale is larger and larger. In recent years, the construction of infrastructure is vigorously developed in China, and a series of construction problems such as dam foundations of dams, expressways, high-speed railways, long-span bridges, high-difficulty tunnels and the like are solved by engineers in China one by one. The problem of slope stability almost appears in all engineering construction, slope instability has the characteristics of being sudden and large in destructiveness and the like, how to achieve real-time continuous monitoring on a large-range slope and adopt proper early warning measures when deformation exceeds a threshold value, a field safety responsible person is informed to timely carry out emergency work such as evacuation and the like, property loss and casualties are reduced to the lowest degree to be undoubtedly the importance of the problem of slope stability, meanwhile, many scholars are contributing one own force for slope deformation monitoring, and the problem is expected to be solved in the early days.
As is known to all, the local overlarge deformation of the side slope is a precursor of occurrence of geological disasters such as landslide and the like, and the monitoring efficiency can be greatly improved by using engineering technologies such as sensors and the like, the labor force is saved, workers can know the deformation condition of the side slope under various working conditions in real time, and the intelligent and automatic inevitable development trend of side slope monitoring is realized.
No matter the slope deformation is monitored by using a traditional total station or a sensor, errors caused by errors of the instrument, environmental factors and the like exist, and meanwhile, based on the all-weather condition of monitoring the slope, more and more data can be stored and processed, so that larger errors are gradually generated in recording and predicting of the slope deformation, and the accuracy of the sensor measurement cannot be guaranteed.
The nano sensor is a sensor for monitoring slope displacement based on a geomagnetic field, a chip capable of sensing the change of the geomagnetic field is arranged in the sensor, the displacement change quantities delta x, delta y and delta z of the nano sensor in the x direction, the y direction and the z direction can be calculated by measuring the change quantities of the geomagnetic field in the x direction, the y direction and the z direction, and then the displacement of the slope can be reflected by superposing the displacement of a plurality of nano sensors and connecting displacement points, so that the safety warning work for the slope can be well performed. The sensor has the characteristics of 24-hour real-time monitoring, high operability and the like, and is widely applied to actual engineering construction.
Based on the advantages of high instantaneity and operability of the nano sensor, the nano sensor is widely applied to engineering construction such as slope and tunnel deformation monitoring.
In the monitoring of slope deformation, the displacement of slope is reflected by the displacement of a plurality of nano-sensors, because there is measuring error in the sensor itself, in addition under adverse factor influences such as rock mass disturbance, natural environment, electromagnetic signal, the influence that the error caused the data precision can further aggravate, cause measuring accuracy not enough, to the prediction of deformation influence such as inaccurate. Secondly, the displacement data only comes from one sensor, and the data source is single, lacks the contrast, and is difficult to rectify, and the credibility is difficult to satisfy the requirement.
Disclosure of Invention
In order to solve the technical problem, the invention provides a double-path nano sensor displacement correction method aiming at two embedding position working conditions that a nano sensor in an actual side slope penetrates through the inside of the side slope to reach a bedrock and is positioned on a sliding surface.
The invention adopts the following technical scheme:
a displacement correction method of a dual-path nano sensor is characterized by comprising the following steps:
s1, aiming at the first working condition that the nano sensor penetrates through the inner part of the side slope to the bedrock:
a1, determining the bottom of the sensor to be in a fixed state, and superposing the displacement in the x, y and z directions obtained by each nano sensor in series from the deep part of the side slope to the surface of the side slope to obtain the displacement data of the surface layer of the side slope, which is a calculation path A, and obtain the displacement data of the path A;
a2, connecting a surface displacement sensor on the surface of the side slope with a nano sensor to obtain surface displacement data of the side slope, and similarly, carrying out displacement superposition on the surface displacement sensor along the opposite direction of the path A to obtain displacement data deep into the bedrock, which is used for calculating the path B to obtain displacement data of the path B;
a3, combining the displacement data of the path A and the path B to carry out error average processing on the displacement of each nano sensor to obtain corrected displacement data;
a4, enabling the nano sensor to generate accurate displacement through an indoor test device to simulate the displacement generated by the nano sensor due to slope deformation in an actual slope, and obtaining simulated actual measurement displacement data;
a5, arranging the obtained path A displacement data, path B displacement data, corrected displacement data and simulated actual measurement displacement data, drawing the data in a displacement graph to obtain four deformation curves, verifying the similarity between the path A displacement data deformation curve, the path B displacement data deformation curve and the corrected displacement data deformation curve and the simulated actual measurement displacement data deformation curve respectively through the similarity calculation of the deformation curves, and verifying the accuracy of the corrected displacement data through the similarity;
s2, aiming at the second working condition, namely that the nano sensor is positioned on the sliding surface;
b1, because the whole sensor moves along with the landslide body, the accuracy of bottom displacement data cannot meet the requirement at the moment, and the calculated path A cannot be accurately measured; calculating the path B and continuing to use, superposing the displacements in the x, y and z directions obtained by each nano sensor along the path B based on the displacement data measured by the earth surface displacement sensors to obtain the displacement data of the path B,
b2, enabling the nano sensor to generate accurate displacement through an indoor test device to simulate the displacement generated by the nano sensor due to slope deformation in an actual slope, and obtaining simulated actual measurement displacement data;
b3, arranging the obtained path B displacement data and the simulated actual measurement displacement data, drawing the path B displacement data and the simulated actual measurement displacement data in a displacement graph to obtain two deformation curves, verifying the similarity of the path B displacement data deformation curve and the simulated actual measurement displacement data deformation curve through the similarity calculation of the deformation curves, and verifying the accuracy of the corrected displacement data through the similarity.
Preferably, the indoor test device comprises a fixed cross beam, a rope, a spring, a movable cross beam, a rail, a nano sensor, a fixed pipe clamp, a fastener, a pedestal and a support column, two sides are fixedly connected with the support column respectively on the pedestal, the support column is fixedly connected with the rail respectively, two rail top ends are fixedly connected with the fixed cross beam, the movable cross beam is connected with the rail fixed on the support column in a fastening and sliding manner through the fastener, the position can be adjusted by sliding up and down on the rail through the fastener, the nano sensors are connected in series, the lower end of the nano sensor at the bottom is fixed with the table top through the fixed pipe clamp, the upper end of the nano sensor at the top is connected with the spring, the rope is connected with the cross beam fixed at the upper end of the indoor test device, a groove is formed in the movable cross beam, and the nano sensors in series connection freely pass through the groove.
Preferably, the movable cross beam is fixedly connected with the fastener through a bolt hole.
Preferably, a spring is arranged between the buckling claws at the back of the fastener, so that the fastener can be conveniently buckled into the clamping track.
Preferably, the plurality of nano-sensors are connected in series by a gimbal.
The invention has the beneficial effects that: the invention provides a method for correcting measurement displacement by double paths, namely a method based on a nano sensor and an earth surface displacement monitoring sensor. The slope displacement curve is corrected by innovatively combining the two paths, compared with the traditional scheme, the method has the advantages that data come from two sensors of different types, data sources are diversified, and the reliability is high. Under the condition that the sensor cannot accurately measure under the bad working condition (working condition two), the error generated by the sensor when the displacement is measured by the sensor can be corrected to the greatest extent, a slope deformation displacement curve can be provided, and the measuring efficiency and the reliability of the sensor are greatly improved. Meanwhile, a special indoor test device is designed for simulation experiment verification, and the accuracy of correcting and measuring displacement data is verified.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a laboratory test apparatus for the validation of the present invention;
FIG. 3 is a rear view of FIG. 2;
FIG. 4 is a left side view of FIG. 2;
FIG. 5 is an enlarged view of one of the layouts of FIG. 2;
FIG. 6 is a schematic diagram of a bottom nat sensor and fixed clamp in a laboratory testing apparatus for validation according to the invention;
FIG. 7 is an enlarged view of a portion of a rail in a laboratory testing apparatus for the verification of the present invention;
FIG. 8 is a schematic view of a fastener of the laboratory test apparatus for verification according to the present invention;
FIG. 9 is a rear view of a fastener in a laboratory test fixture for use in the verification of the invention;
FIG. 10 is an enlarged fragmentary view of the fastener and rail attachment of the verification lab scale of the present invention;
FIG. 11 is a graph of displacement deformation for four data sets in accordance with the present invention;
in the figure: 1. fixed beam, 2, rope, 3, spring, 4, movable beam, 5, universal joint, 6, track, 7, nano-sensor, 8, fixed pipe clamp, 9, fastener, 10, pedestal, 11, support column.
Detailed Description
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example (b): as shown in fig. 1, a method for calibrating the displacement of a dual-path nano-sensor is characterized by comprising the following steps:
s1, aiming at the first working condition that the nano sensor penetrates through the inner part of the side slope to the bedrock:
a1, determining the bottom of the sensor to be in a fixed state, and superposing the displacement in the x, y and z directions obtained by each nano sensor in series from the deep part of the side slope to the surface of the side slope to obtain the displacement data of the surface layer of the side slope, which is a calculation path A, and obtain the displacement data of the path A;
a2, connecting a surface displacement sensor on the surface of the side slope with a nano sensor to obtain surface displacement data of the side slope, and similarly, carrying out displacement superposition on the surface displacement sensor along the opposite direction of the path A to obtain displacement data deep into the bedrock, which is used for calculating the path B to obtain displacement data of the path B;
a3, combining the displacement data of the path A and the path B to carry out error average processing on the displacement of each nano sensor to obtain corrected displacement data;
a4, enabling the nano sensor to generate accurate displacement through an indoor test device to simulate the displacement generated by the nano sensor due to slope deformation in an actual slope, and obtaining simulated actual measurement displacement data;
a5, arranging the obtained path A displacement data, path B displacement data, corrected displacement data and simulated actual measurement displacement data, drawing the data in a displacement graph to obtain four deformation curves, verifying the similarity between the path A displacement data deformation curve, the path B displacement data deformation curve and the corrected displacement data deformation curve and the simulated actual measurement displacement data deformation curve respectively through the similarity calculation of the deformation curves, and verifying the accuracy of the corrected displacement data through the similarity;
s2, aiming at the second working condition, namely that the nano sensor is positioned on the sliding surface;
b1, because the whole sensor moves along with the landslide body, the accuracy of bottom displacement data cannot meet the requirement at the moment, and the calculated path A cannot be accurately measured; calculating the path B and continuing to use, superposing the displacements in the x, y and z directions obtained by each nano sensor along the path B based on the displacement data measured by the earth surface displacement sensors to obtain the displacement data of the path B,
b2, enabling the nano sensor to generate accurate displacement through an indoor test device to simulate the displacement generated by the nano sensor due to slope deformation in an actual slope, and obtaining simulated actual measurement displacement data;
b3, arranging the obtained path B displacement data and the simulated actual measurement displacement data, drawing the path B displacement data and the simulated actual measurement displacement data in a displacement graph to obtain two deformation curves, verifying the similarity of the path B displacement data deformation curve and the simulated actual measurement displacement data deformation curve through the similarity calculation of the deformation curves, and verifying the accuracy of the corrected displacement data through the similarity.
As shown in figures 2-10, the indoor testing device for verification of the invention comprises a fixed beam 1, a rope 2, a spring 3, a movable beam 4, a track 6, a Natt sensor 7, a fixed pipe clamp 8, a fastener 9, a pedestal 10 and a support column 11, wherein the support column is respectively and fixedly connected with two sides of the pedestal, the track is respectively and fixedly connected with the support column, the top ends of the two tracks are fixedly connected with the fixed beam, the movable beam is fixedly and slidably connected with the track fixed on the support column through the fastener, the position of the movable beam and the fastener can be adjusted up and down on the track through the fastener, the spring is arranged at the buckling claw position at the back of the fastener, so that the fastener can be conveniently buckled into the clamping track, a plurality of Natt sensors are mutually connected in series, the lower end of the Natt sensor at the bottom is fixed with a table board through the fixed pipe clamp, the upper end of the Natt sensor above is connected with the spring, and then connected with a beam fixed at the upper end of the indoor test device by a rope. A plurality of nano-sensors are connected in series by a gimbal 5. The groove arranged in the movable cross beam can realize that the sensor can freely move on a fixed plane, the multi-degree-of-freedom movement better simulates the condition of an actual side slope, and the scientificity and the reliability of an indoor test are improved.
In the experiment, the caliper can be used for enabling the sensor to generate accurate displacement to simulate the displacement generated by the sensor due to slope deformation in an actual slope.
As shown in fig. 11, four kinds of deformation curves can be drawn in the displacement graph by rounding the measured displacement data of the nano sensor and the indoor test data obtained by the method of the present invention, and through calculation of the similarity of the deformation curves, the similarity of the path a deformation curve, the path B deformation curve, the corrected deformation curve and the simulated measured deformation curve is 71%, 77.8% and 89%, respectively, and the similarity of the corrected deformation curve and the simulated measured deformation curve is improved by 18% and 11.2% respectively compared with the similarity of the path a and the path B and the simulated measured deformation curve, and it can be seen that the corrected deformation curve is more fitted to the simulated actual curve, which proves that the method has good applicability and accuracy for correction of the displacement of the nano sensor.
The invention provides a method for correcting measurement displacement based on a 'dual-path' sensor and a ground surface displacement monitoring sensor. The slope displacement curve is corrected by innovatively combining the two paths, compared with the traditional scheme, the method has the advantages that data come from two sensors of different types, data sources are diversified, and the reliability is high. Under the condition that the sensor cannot accurately measure under the bad working condition (working condition two), the error generated by the sensor when the displacement is measured by the sensor can be corrected to the greatest extent, a slope deformation displacement curve can be provided, and the measuring efficiency and the reliability of the sensor are greatly improved.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (5)
1. A displacement correction method of a dual-path nano sensor is characterized by comprising the following steps:
s1, aiming at the first working condition that the nano sensor penetrates through the inner part of the side slope to the bedrock:
a1, determining the bottom of the sensor to be in a fixed state, and superposing the displacement in the x, y and z directions obtained by each nano sensor in series from the deep part of the side slope to the surface of the side slope to obtain the displacement data of the surface layer of the side slope, which is a calculation path A, and obtain the displacement data of the path A;
a2, connecting a surface displacement sensor on the surface of the side slope with a nano sensor to obtain surface displacement data of the side slope, and similarly, carrying out displacement superposition on the surface displacement sensor along the opposite direction of the path A to obtain displacement data deep into the bedrock, which is used for calculating the path B to obtain displacement data of the path B;
a3, combining the displacement data of the path A and the path B to carry out error average processing on the displacement of each nano sensor to obtain corrected displacement data;
a4, enabling the nano sensor to generate accurate displacement through an indoor test device to simulate the displacement generated by the nano sensor due to slope deformation in an actual slope, and obtaining simulated actual measurement displacement data;
a5, arranging the obtained path A displacement data, path B displacement data, corrected displacement data and simulated actual measurement displacement data, drawing the data in a displacement graph to obtain four deformation curves, verifying the similarity between the path A displacement data deformation curve, the path B displacement data deformation curve and the corrected displacement data deformation curve and the simulated actual measurement displacement data deformation curve respectively through the similarity calculation of the deformation curves, and verifying the accuracy of the corrected displacement data through the similarity;
s2, aiming at the second working condition, namely that the nano sensor is positioned on the sliding surface;
b1, because the whole sensor moves along with the landslide body, the accuracy of bottom displacement data cannot meet the requirement at the moment, and the calculated path A cannot be accurately measured; calculating the path B and continuing to use, superposing the displacements in the x, y and z directions obtained by each nano sensor along the path B based on the displacement data measured by the earth surface displacement sensors to obtain the displacement data of the path B,
b2, enabling the nano sensor to generate accurate displacement through an indoor test device to simulate the displacement generated by the nano sensor due to slope deformation in an actual slope, and obtaining simulated actual measurement displacement data;
b3, arranging the obtained path B displacement data and the simulated actual measurement displacement data, drawing the path B displacement data and the simulated actual measurement displacement data in a displacement graph to obtain two deformation curves, verifying the similarity of the path B displacement data deformation curve and the simulated actual measurement displacement data deformation curve through the similarity calculation of the deformation curves, and verifying the accuracy of the corrected displacement data through the similarity.
2. The method as claimed in claim 1, wherein the indoor testing device comprises a fixed beam, a rope, a spring, a movable beam, a rail, a Natt sensor, a fixed pipe clamp, a fastener, a pedestal and a support column, wherein the support column is fixedly connected to two sides of the pedestal, the rail is fixedly connected to the support column, the fixed beam is fixedly connected to the top ends of the two rails, the movable beam is connected to the rail fixed to the support column through the fastener, the position of the movable beam can be adjusted on the rail by sliding up and down through the fastener, the Natt sensors are connected in series, the lower end of the Natt sensor at the bottom is fixed to the table top through the fixed pipe clamp, the upper end of the Natt sensor at the upper part is connected to the spring and then connected to the beam fixed to the upper end of the indoor testing device through the rope, and a groove is formed in the movable beam, the series of nano-sensors passes freely through the grooves.
3. The method of claim 2, wherein the movable beam is fixedly connected to the fastener by a bolt hole.
4. The method as claimed in claim 2, wherein a spring is provided between the back and the latch of the fastener to facilitate the fastening of the fastener to the clamping rail.
5. The method of claim 2, wherein the plurality of nano-sensors are connected in series by a gimbal.
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